Preoperative Electrocardiogram Research Articles

Electrocardiograms Do Not Detect Myocardial Ischemia in Patients With Williams Syndrome and Nonsyndromic Elastin Arteriopathy With Coronary Artery Stenosis

Coronary artery stenosis (CAS) may affect up to 27% of patients with Williams syndrome (WS), which may lead to myocardial ischemia. Patients with WS face a 25- to 100-fold greater risk of sudden cardiac death, frequently linked to anesthesia. Assessing CAS requires either imaging while under general anesthesia or intraoperative assessment, with the latter considered the gold standard. Our study aimed to identify electrocardiogram (ECG) markers of myocardial ischemia in patients with WS or nonsyndromic elastin arteriopathy and documented CAS. We retrospectively reviewed patients with WS/elastin arteriopathy who underwent supravalvar aortic stenosis surgery and CAS assessment from January 1, 2006 to April 30, 2021. A pediatric electrophysiologist, not aware of the patients' CAS status, reviewed their preoperative ECGs for markers of ischemia. We assessed associations of study parameters using Wilcoxon rank-sum and Fisher's exact tests. Of 34 patients, 62% were male, with a median age of 20 months (interquartile range: 8 to 34). CAS was present in 62% (21 of 34), 76% of whom (16 of 21) were male. There were no ECG indicators of myocardial ischemia in patients with CAS. In conclusion, CAS was present in >1/2 the children with WS/elastin arteriopathy who underwent repair of supravalvar aortic stenosis. CAS in WS/nonsyndromic elastin arteriopathy does not appear to exhibit typical ECG-detectable myocardial ischemia. ECGs are not a useful screening tool for CAS in WS/elastin arteriopathy. Given the high anesthesia-related cardiac arrest risk, other noninvasive indicators of CAS are needed.

Preventing quality improvement drift: evaluation of efforts to sustain the cost savings from implementing best practice guidelines to reduce unnecessary electrocardiograms (ECGs) during the preadmisison testing evaluation.

Medical professionals commonly fail to follow best practice guidelines. Drift, or a return to previous tendencies, is abundant in healthcare even when guidelines are followed initially. This "drift" was found internally at Temple University Hospital with preoperative electrocardiograms (ECGs). Best-practice guidelines were instituted and followed as a first step, but sustaining performance improvement was the ultimate goal. The objectives are to improve and maintain adherence to published guidelines for preoperative ECG testing at Temple University Hospital in a physician-led, nurse practitioner (NP)-staffed preadmission testing (PAT) clinic. To start this quality improvement (QI) project, a retrospective chart review was completed to determine the number of ECGs performed in PAT at Temple University Hospital in 2017. New guidelines for ordering preoperative ECGs were then implemented, and Plan-Do-Study-Act (PDSA) cycles were performed over 3 years. A repeat retrospective chart review was completed and looked at ECGs ordered from 2018 through 2020. The number of ECGs completed in PAT before and after implementation of the new guidelines was then compared. In addition, the complexity of our surgical patients was estimated by looking at the yearly average American Society of Anesthesiology Physical Health Status (American Society of Anesthesiology [ASA] status) values assigned. Finally, the cost of performing each ECG was calculated, and the cost savings to the hospital over 4 years was determined. The baseline ECG rate for PAT in 2017, 2018, 2019, and 2020 at Temple University Hospital was 54.0 , 20.7, 22.3, and 21.9 %, respectively, which was a statistically significant decrease in ECG performance rate in the years after implementation of the PDSA project. The ASA status average remained constant, demonstrating that while patients' medical diagnoses remained on average the same, reinforced training had been effective in preventing a return to previous liberal ordering tendencies. Over the course of 4 years, the reduction in unnecessary ECGs led to an estimated direct cost savings of $213,000. Self-adoption of best-practice guidelines among clinicians is often poor; however, the barriers to adoption can be overcome with education and individual feedback. Sustaining performance improvement gains is challenging, but possible, as shown by example in one urban, academic teaching hospital's physician-led, NP-staffed outpatient clinic.

NT-proBNP level as a substitute for myocardial perfusion scan in preoperative cardiovascular risk assessment in noncardiac surgery

BackgroundPreoperative cardiovascular risk assessment is one of the main principles before noncardiac surgeries. Cardiac stress imaging, such as myocardial perfusion scan (MPS), is a proposed cardiovascular risk evaluation method according to the latest guidelines. Yet, its efficacy, along with the cost-effectiveness of the method, has been questioned in previous studies. Our study aims to evaluate the utility of N-terminal pro-b-type natriuretic peptide (NT-proBNP) level measurement in predicting postoperative cardiovascular complications in candidates who have undergone an MPS before surgery and compare the results.MethodsA cohort of 80 patients with a revised cardiac risk index score of one or more who were scheduled for moderate to high-risk noncardiac surgeries and met the criteria to undergo an MPS for risk assessment were included in the study. All of them underwent an MPS one week before surgery. Their preoperative NT-proBNP, troponin levels, and electrocardiograms were obtained one day before surgery and again on day three postoperative. The predictive efficacy of NT-proBNP levels and MPS were compared.ResultsSeventy-eight patients underwent surgery, three of which exhibited a rise in troponin level, six showed changes on electrocardiogram, and pulmonary edema was detected in one, three days after surgery. There was no mortality in our patients. The sensitivity and specificity of the MPS for predicting postoperative cardiovascular complications were 100% and 66%, respectively. MPS also had a positive predictive value of 20% and a negative predictive value of 100% in our study. A 332.5 pg/ml cut-off value for NT-proBNP level yielded a sensitivity of 100%, specificity of 79.2%, positive predictive value of 40%, and negative predictive value of 100%.ConclusionsOur study reveals the incremental specificity and positive predictive value of NT-proBNP level measurement in preoperative cardiovascular risk evaluation compared to MPS. Given the low feasibility, high costs, and disappointing predictive value of MPS, preoperative NT-proBNP level assessment can be substituted. This method can assist anesthesiologists and surgeons with precisely detecting at-risk patients resulting in taking proper measures to reduce the morbidity and mortality of the proposed patients before and during surgeries.

Atrial Fibrillation after Descending Aorta Repair: Occurrence, Risk Factors, and Impact on Outcomes.

As risks of repairing the descending thoracic and thoracoabdominal aorta diminish, common complications that may prolong hospital stay, or actually increase risk, require attention. One such complication is postoperative atrial fibrillation (AF). Therefore, we characterized prevalence of, risk factors for, and effects of postoperative atrial fibrillation (PoAF) after descending and thoracoabdominal aorta repair. From January 2000 to January 2011, 696 patients underwent open descending or thoracoabdominal aorta repair at Cleveland Clinic. Operations approached via median sternotomy (n = 178) and patients treated preoperatively for arrhythmias (32 amiodarone, 9 paced) or in AF on preoperative electrocardiogram (n = 14) were excluded, leaving 463. Logistic regression analysis identified risk factors for PoAF. Temporal relation of PoAF with postoperative morbidities was determined, and outcomes following PoAF were compared between propensity-matched pairs. New-onset PoAF occurred in 101 patients (22%) at a median 68 hours of postincision. Risk factors included older age (p = 0.002) and history of remote AF (p = 0.0004) but not operative details, such as pericardiotomy for cardiac cannulation. Hypoperfusion and neurologic complications tended to precede PoAF, whereas sepsis, respiratory failure, and dialysis followed. Among 94 propensity-matched patient pairs, those developing PoAF were more likely to experience hypoperfusion (p = 0.006), respiratory failure (p = 0.009), dialysis (p = 0.04), paralysis (p < 0.0001), longer intensive care unit stay (median 7 vs. 5 d, p = 0.02), and longer postoperative hospital stay (median 15 vs. 13 d, p = 0.004). However, hospital death was similar (6/94 PoAF [6.4%] vs. 7/94 no PoAF [7.4%], p = 0.8). PoAF after descending thoracic aorta surgery is relatively common and a part of a constellation of other serious complications prolonging postoperative recovery. While PoAF was associated with adverse events, it did not impact postoperative cost and mortality. Descending thoracic aorta surgery is by itself comorbid enough, which is likely why PoAF does not have a more significant effect on postoperative recovery and cost.

Impact of coronary artery bypass grafting on ventricular repolarization indexes

Abstract Funding Acknowledgements Type of funding sources: None. Introduction Ventricular repolarization indexes (VRI) tend to be altered in patients with chronic coronary artery disease, which are associated with a higher risk of malignant arrhythmias and higher mortality. Coronary artery bypass grafting (CABG) is capable of reducing mortality, as well as improving arrhythmic burden in this population. However, we do not know whether these benefits can be explained by improvement in VRI. Purpose To determine whether there is improvement in VRI after CABG, as well as to analyse possible effects of clinical and surgical variables on these indexes. Methodology A total of 150 patients who underwent CABG were included. Through the evaluation of preoperative and hospital discharge electrocardiograms, the QT interval, the interval from the peak to the end of T wave (Tp-Te) and the Tp-Te/ QT ratio were analysed. The values obtained before and after CABG were compared, as well as their association with clinical and surgical variables. Results The population was predominantly male (77.3 %), mean age of 61.6±8.3 years-old and mean LVEF of 58.8±10.6 %. A reduction in the QT interval (398.93±34.68 vs 365.47±50.38 ms, p &amp;lt; 0.001), in the Tp-Te interval (72.2±17.2 vs 61.6±19.5 ms, p &amp;lt; 0.001) and in the Tp-Te/ QT ratio (0.18±0.17 vs 0.04±0.05, p = 0.004) after CABG. There was no correlation between VRI and clinical and surgical variables. Conclusion CABG had a important impact in the reduction of QT and Tp-Te intervals, as well as the Tp-Te/ QT ratio, suggesting that the acute improvement in the coronary perfusion is directly associated with the improvement in these VRI.

Аnalysis of preoperative and postoperative electrocardiogram in children with total anomalous pulmonary venous connection

Introduction. TAPVC is a condition that requires diagnosis and surgical treatment in a short period of time. As the result of an absence of the direct connection between pulmonary veins and left atrium, systemic and pulmonary venous return drainage to the right heart with volume and pressure overload. At the same time, left heart preload is depending on atrial septal defect. The hemodynamic features of the TAPVC create conditions for abnormal spread of electric impulses, whereas necessity of surgical reconstruction on the atrial level — reasons for rhythm and conduction disturbance in postoperative period.Aim of the study: detection of specific EKG markers of TAPVC for differential diagnosis of critical conditions in children, analysis of basis preand postoperative EKG to determine EKG pattern in children with TAPVC, registration of EKG changing in early and late postoperative period to define the potential rhythm and conduction disturbance in patients with TAPVC.Materials and methods. The data of biventricular TAPVC patients were reviewed. We estimated characteristic of P, PQ, QRS, QT, rhythm and conduction disturbance and evaluated preand postoperative EKG data, with their comparison in 30 patients. Results. Preoperative EKG (9,3 ± 6,5 days) showed sinus rhythm in all cases, P wave was 62,6 ± 10,6 (40–80) msec, PQ — 104,1 ± 15 (80–160) msec, QRS — 64,3 ± 13,5 (40–100) msec, QT — 253,1 ± 29,5 (210–350) msec, electric axis of the heart — 130,9 ± 44,4 (-70 ± 185). Postoperative rhythm was sinus in 83,3 % cases, atrial ectopic — 13,3 %, AV node rhythm — 3,3 %. The comparison of preand postoperative EKG data showed significant (p &lt; 0,05) difference in P, QT, and electric axis of the heart measurements. In late postoperative period we detected non-pathological differences in P, PQ, QRS, QT compared early posleoperative period, but sinus node dysfunction frequency was high in late postoperative period.Conclusion. There are no specific ECG markers in preoperative TAPVC patients. The standard EKG showed right heart volume and pressure overloud with positive changing of it after surgical correction of TAPVC. The early postoperative EKG did not showed “typical” rhythm and conduction disturbance after surgery at the atrial level, but patients require a long-time dynamic observation after TAPVC surgery because of higy frequency of sinus node dysfunction in late postoperative period.

P223 MYOCARDIAL INJURY AFTER NONCARDIAC SURGERY (MINS): A RETROSPECTIVE ANALISYS OF OUR LAST TWO YEARS OF WORK

Abstract Introduction Myocardial injury is defined as an elevation of troponin due to ischemic causes, with or without clinical signs. In the myocardial injury after noncardiac surgery (MINS), troponin elevation usually occurs without signs of ischemia. The etiology of this perioperative pathology, is in most cases based on a mismatch between oxigen supply and demand. Recently, expert consensus and european guidelines suggest the implementation of diagnostic tools for perioperatory screening of patients at risk of MINS. Aims: to evaluate the clinical course of patients who have experienced MINS in the last two years in our hospital, in order to identity the lacks of our diagnostic and terapeutic tools. Methods we retrospectively evaluated 122 consecutive patients who experienced MINS in the perioperative period from january 2021 to december 2022. For each patient, we have collected data regarding clinical, strumental and laboratoristics characteristics, such as biomarkers, risk factors and type/urgency of surgery. Results more than half of patients with MINS (54%) had a low patient–related risk, whereas only 17% of them had a high risk. Regarding the surgery–related risk, only a third of patients (33.6%) had high risk related to the type or urgency of surgery, whereas two thirds of them (66.3%) had low or intermediate risk related to surgery. Combining these risks, resulted that only a minority of patients (5%) had both patient related and surgery–related risk, whereas less than a half (42%) of patients had a high patient related or high surgery related risk. Instead, most of the patients (68%) had low patient–related risk or low surgery related risk. All patients had a pre–operative electrocardiogram. More than a half (54,9%) of patients had a pre–operative transthoracic echocardiography. Large majority (95,6%) of patients had a pre–operative troponin. Conclusion careful assessment with patient–related and surgery–related cross risk, such as adoption of common diagnostic tools did not allow us to adopt an effective peri–operative screening for patients at risk of MINS.

High-Burden Premature Atrial Contractions Predict New-Onset Atrial Fibrillation After Surgical Septal Myectomy

Although increased premature atrial contractions (PACs) reportedly predict atrial fibrillation (AF) in both general and specific (e.g., patients with stroke) populations, early postoperative AF (POAF) risk in patients with increased PAC burden who require cardiac surgery remains unclear. We examined the correlation between different preoperative PAC burdens and POAF in patients with obstructive hypertrophic cardiomyopathy (OHCM) who underwent surgical treatment. We analyzed 304 consecutively admitted patients with OHCM without previous AF who underwent isolated septal myectomy between January 2015 and December 2018. All patients underwent preoperative 24-hour Holter electrocardiogram monitoring. PACs were present in 259 patients (85.20%) and absent in 45 patients (14.80%). According to the cut-off PAC number of 100beats/24hours, there were 211 patients (69.41%) with low-burden PACs and 48 patients (15.79%) with high-burden PACs. AF after septal myectomy occurred in 73 patients, which consisted of 3/45 in the non-PAC group (6.67%), 47/211 in the low-PAC-burden group (22.27%), and 23/48 in the high PAC burden group (47.92%). POAF incidence was higher in both low- and high-burden patients than in patients without PAC (p <0.01). Multivariate logistic regression analyses demonstrated that high-burden PACs (p=0.02) and age (p <0.01) but not low-burden PACs (p=0.22) independently predicted POAF in patients with OHCM. The area under the receiver operating characteristic curve for preoperative PACs was 0.72 (95% confidence interval 0.66 to 0.79, p <0.01, sensitivity: 68.49%, specificity: 69.26%). In conclusion, POAF incidence was significantly higher in patients with preoperative high-burden PACs and can predict POAF in patients with OHCM.

MP72-12 ARTIFICIAL INTELLIGENCE ANALYSIS OF PRE-OPERATIVE ECGS CAN PREDICT POST-OPERATIVE DEATH AND MAJOR CARDIAC COMPLICATIONS

You have accessJournal of UrologyCME1 Apr 2023MP72-12 ARTIFICIAL INTELLIGENCE ANALYSIS OF PRE-OPERATIVE ECGS CAN PREDICT POST-OPERATIVE DEATH AND MAJOR CARDIAC COMPLICATIONS Vidit Sharma, Harrison Gottlich, Christine Lohse, Abhinav Khanna, Elizabeth Habermann, Suraj Kapa, Zachi Attia, Stephen Boorjian, and Bradley Leibovich Vidit SharmaVidit Sharma More articles by this author , Harrison GottlichHarrison Gottlich More articles by this author , Christine LohseChristine Lohse More articles by this author , Abhinav KhannaAbhinav Khanna More articles by this author , Elizabeth HabermannElizabeth Habermann More articles by this author , Suraj KapaSuraj Kapa More articles by this author , Zachi AttiaZachi Attia More articles by this author , Stephen BoorjianStephen Boorjian More articles by this author , and Bradley LeibovichBradley Leibovich More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000003340.12AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Approximately 1% of patients undergoing non-cardiac surgery die or have a major adverse cardiac event(MACE) within 30 days. Only 20% of surgeons use online risk calculators to risk-stratify patients due to increased clinical burden. Herein, we investigate if our institution's previously created AI algorithms on pre-operative electrocardiograms(ECGs) can serve as a point-of-care risk stratification for post-operative complications. METHODS: From our institutional National Surgical Quality Improvement Program(NSQIP) data, we identified 128,992 non-cardiac surgeries performed on 116,702 distinct patients between 2006-2020. We identified pre-operative ECGs within 90 days of surgery; AI algorithms were used to derive variables in (Table 1). We evaluated the relationship of AI ECG features with the following 30-day outcomes: death and MACE (stroke, cardiac event, or death). AI ECG features were evaluated in conjunction with NSQIP Surgical Risk Calculator (SRC) variables using multivariable logistic regression models to predict these outcomes, using 500-sample bootstrap-corrected c-indexes. RESULTS: A total of 50,254(39%) surgeries(13% Urologic) had pre-operative ECGs available. The AI ECG features (Table 1) collectively had a c-index of 0.755 and 0.719, respectively, for 30-day death(n=414; 0.8%) and MACE(n=676; 1.4%). After adjusting for NSQIP SRC variables, AI ECG variables remained significantly associated with death and MACE (Table 2). The final model with AI ECG features and NSQIP SRC variables had a c-index of 0.902 death) and 0.845(MACE). CONCLUSIONS: AI features of pre-operative ECGs were significantly associated with death or MACE within 30-days of non-cardiac surgery. Clinical implementation of these algorithms to pre-operatively identify high risk surgical candidates warrants further study. Source of Funding: No sources of funding to disclose © 2023 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 209Issue Supplement 4April 2023Page: e1029 Advertisement Copyright & Permissions© 2023 by American Urological Association Education and Research, Inc.MetricsAuthor Information Vidit Sharma More articles by this author Harrison Gottlich More articles by this author Christine Lohse More articles by this author Abhinav Khanna More articles by this author Elizabeth Habermann More articles by this author Suraj Kapa More articles by this author Zachi Attia More articles by this author Stephen Boorjian More articles by this author Bradley Leibovich More articles by this author Expand All Advertisement PDF downloadLoading ...

Interatrial blocks in patients with tavi and their associations with clinic parameters

Aims: The present study attempted to evaluate the prevalence of basal interatrial blocks (IABs), their associations with clinical parameters, and the interatrial conduction in the follow-up after a successful transcatheter aortic valve implantation (TAVI) procedure among patients with severe aortic stenosis. Methods: We retrospectively evaluated the findings of 90 patients undergoing TAVI in our center. Overall, we considered the presence and grades of IABs and P-wave durations in electrocardiograms (ECG), preoperative echocardiography (ECHO) findings (maximum and mean gradients and left atrium (LA) diameter), valve size and type, and changes in these parameters at sixth month. Results: Forty-six patients were included in the study which are suitable for the pre-determined inclusion criteria. We found the mean age of the patients to be 74.78 ± 8.66 years. In preoperatively-evaluated ECGs, while we detected partial IABs in 37% of the patients, there were advanced IABs in 6.5%, but 56.5% yielded no interatrial conduction disorder. On the other hand, in postoperatively-evaluated ECGs, while we observed partial IABs in 30.4% of the patients, there were advanced IABs among 21.7% (p = 0.017). Nevertheless, we could not conclude any IABs among 47.8% of the patients. Besides, 54.3% of the patients received a self-expandable valve, and a balloon-expandable valve was inserted in 45.7%. In this regard, we detected partial (7 patients) and advanced (2 patients) IABs in the preoperatively-evaluated ECGs of the patients receiving a self-expandable valve. In the postoperative ECGs of these patients, while the partial IAB remained the same in 4 patients (57.1%), it progressed to an advanced IAB in 3 (42.9%). In addition, while the advanced IAB regressed to a partial IAB in one patient, it remained the same for the other patient. In this group, the mean P-wave durations were found to be 118.4±22.67 before the TAVI and 119.6±21.69 after the TAVI (p = 0.113). In the preoperative ECGs of 21 patients with a balloon-expandable valve, we detected partial IABs in 10 patients and an advanced IAB in one patient. While a partial IAB developed in five patients (p = 0.022), five patients with a partial IAB developed an advanced IAB following the procedure (p = 0.022). In this group, we noticed a significant difference between preoperative (127.62±19.4) and postoperative (138.71+ 32.03) P-wave durations (p = 0.038). Conclusion: In a nutshell, we concluded no significant change in interatrial conduction time of the patients with TAVI compared to the baseline in their sixth-month ECGs. When considered by valve type, we concluded that the development and progression of IABs were significant among those with a balloon-expandable valve. The higher postoperative mean gradient among those with a balloon-expandable valve compared to those with a self-expandable valve may be associated with significantly longer P-wave duration among those with a balloon-expandable valve.

Beyond guideline knowledge: a theory-based qualitative study of low-value preoperative testing

BackgroundChoosing Wisely Canada and most major anesthesia and preoperative guidelines recommend against obtaining preoperative tests before low-risk procedures. However, these recommendations alone have not reduced low-value test ordering. In this study, the theoretical domains framework (TDF) was used to understand the drivers of preoperative electrocardiogram (ECG) and chest X-ray (CXR) ordering for patients undergoing low-risk surgery (‘low-value preoperative testing’) among anesthesiologists, internal medicine specialists, nurses, and surgeons.MethodsUsing snowball sampling, preoperative clinicians working in a single health system in Canada were recruited for semi-structured interviews about low-value preoperative testing. The interview guide was developed using the TDF to identify the factors that influence preoperative ECG and CXR ordering. Interview content was deductively coded using TDF domains and specific beliefs were identified by grouping similar utterances. Domain relevance was established based on belief statement frequency, presence of conflicting beliefs, and perceived influence over preoperative test ordering practices.ResultsSixteen clinicians (7 anesthesiologists, 4 internists, 1 nurse, and 4 surgeons) participated. Eight of the 12 TDF domains were identified as the drivers of preoperative test ordering. While most participants agreed that the guidelines were helpful, they also expressed distrust in the evidence behind them (knowledge). Both a lack of clarity about the responsibilities of the specialties involved in the preoperative process and the ease by which any clinician could order, but not cancel tests, were drivers of low-value preoperative test ordering (social/professional role and identity, social influences, belief about capabilities). Additionally, low-value tests could also be ordered by nurses or the surgeon and may be completed before the anesthesia or internal medicine preoperative assessment appointment (environmental context and resources, beliefs about capabilities). Finally, while participants agreed that they did not intend to routinely order low-value tests and understood that these would not benefit patient outcomes, they also reported ordering tests to prevent surgery cancellations and problems during surgery (motivation and goals, beliefs about consequences, social influences).ConclusionsWe identified key factors that anesthesiologists, internists, nurses, and surgeons believe influence preoperative test ordering for patients undergoing low-risk surgeries. These beliefs highlight the need to shift away from knowledge-based interventions and focus instead on understanding local drivers of behaviour and target change at the individual, team, and institutional levels.

Predicting Postoperative Emergence Delirium From the Heart Rate Variability of Patients Undergoing Elective Cardiac Surgery.

Background and objective The complication of postoperative delirium is directly linked to prognosis, leading to prolonged hospital stays and an increase in mortality. Since there is no magic medicine that cures delirium, the prevention of its onset is important, and the development of simple tools that enable the early assessment of the risk is valuable. In the previous study, we hypothesized that postoperative delirium could be predicted from heart rate variability (HRV) measured by using an electrocardiogram (ECG) on the day before elective esophageal cancer surgery. HRV is calculated based on the fluctuation of RR intervals on ECG. The preoperative high-frequency (HF) power in delirium patients was significantly lower than that in non-delirium patients. The HF component is considereda reflection of parasympathetic function. In the current study, we evaluated the hypothesis that parasympathetic nerve activity is low in the resting HRV on the night before surgery in patients who go on to develop postoperative delirium. To that end, we recorded resting HRV in patients scheduled for cardiac surgery on the night before surgery. We then compared the HRV between patients with and without delirium in the postoperative intensive care unit (ICU). The Confusion Assessment Method for the ICU (CAM-ICU) was used to diagnosedelirium. Methods This was a prospective observational study involving patients undergoing elective cardiac surgery. After obtaining approval from the institutional review board, patients aged 65 years and older were enrolled in the study. The day before surgery, a Mini-Mental State Examination (MMSE) was performed. The ECG was used in patients for five minutes. All patients were transferred to the ICU after surgery, and CAM-ICU was measured every eight hours until discharge from the ICU, and positive patients were diagnosed with delirium. Results In this study, 14 patients who developed delirium and 22 patients who did notwere included in the analysis. The average MMSE score was 27.4, with no patients diagnosed with preoperative dementia. In the analysis of HRV, the HF component was significantly lower in the group with delirium compared to the group without delirium (Mann-Whitney U test, p<0.05). Conclusion Based on our findings, in patients with postoperativedelirium, the activity of parasympathetic nerves was lower than before surgery, andwe concluded that it is possible to predict the onset of postoperative delirium based on preoperative ECG measurement.

Association of Mitral Regurgitation with Postoperative Atrial Fibrillation in Critically Ill Noncardiac Surgery Patients: A Prospective Cohort Study.

Atrial fibrillation (AF) is common in critically ill patients and can have serious consequences. Postoperative AF (POAF) in critically ill patients following noncardiac surgery has been understudied, contrary to cardiac procedures. Mitral regurgitation (MR) is associated with left ventricular dysfunction, which might contribute to the occurrence of AF in postoperative critically ill patients. This study aimed to investigate the association between MR and POAF in critically ill noncardiac surgery patients and establish a new nomogram for the prediction of POAF in critically ill noncardiac surgery patients. A prospective cohort of 2474 patients who underwent thoracic and general surgery was enrolled in this study. Data on preoperative transthoracic echocardiography (TTE), electrocardiogram (ECG), and several commonly utilized scoring systems (CHA2DS2-VASc, HATCH, COM-AF, HART, and C2HEST) and baseline clinical data were collected. Independent predictors were selected by univariate and multivariable logistic regression analysis, and a nomogram was constructed for POAF within 7 days after postoperative intensive care unit (ICU) admission. The ability of the MR-nomogram and other scoring systems to predict POAF was compared by receiver operator characteristic (ROC) curve analysis and decision curve analysis (DCA). Additional contributions were evaluated by integrated discrimination improvement (IDI) and net reclassification improvement (NRI) analysis. A total of 213 (8.6%) patients developed POAF within 7 days after ICU admission. Compared to CHA2DS2-VASc, HATCH, COM-AF, HART, and C2HEST scoring systems, MR-nomogram showed better predictive ability for POAF with an area under the ROC curve of 0.824 (95% confidence interval: 0.805-0.842, p < 0.001). The improvement of the MR-nomogram in predictive value was supported by NRI and IDI analysis. The net benefit of the MR nomogram was maximal in DCA. MR is an independent risk factor of POAF in critically ill noncardiac surgery patients. The nomogram predicted POAF better than other scoring systems.

Retained peripherally inserted central catheter guidewire with vegetation.

Sir, Central venous cannulation is often a necessity for patients in intensive care units or in patients with difficult peripheral access. Loss of the guidewire is a serious and potentially life-threatening complication with reports of fatalities in up to 20% of cases, when the complete guide wire is lost.[1] A 2-year 3-month-old female child presented to our institute with chief complaints of poor weight gain, abdominal discomfort, and decrease in appetite. Chest X-ray of the patient showed a radio-dense wire extending into inferior vena cava (IVC) and right atrium [Figure 1]. Patient had a history of hospital admission at the age of 8 months for jaundice. Peripherally inserted central catheter (PICC) was inserted at that hospital in right femoral vein due to difficult peripheral venous cannulation. PICC line was kept for 12 days and later it was removed. Later on, patient presented to our institute with above mentioned complaints. Computerised tomography (CT) scan showed evidence of a linear radio-dense wire extending from infrarenal IVC into the right ventricle. Its tip was seen in the superior vena cava suggestive of foreign material [Figure 1b]. Transthoracic echocardiography showed a hyperechoic mobile structure of size 20 × 10 mm (possibly a vegetation) in the right atrium having attachment to the superior vena cava and IVC with to-and-fro movement across tricuspid valve and near total occlusion of IVC by hyperechoic structure till mid abdomen level [Video 1]. Moderate to severe tricuspid regurgitation (TR) was seen on transthoracic echocardiography. Surgical removal of PICC guidewire was planned. Complete blood count, serum electrolytes, coagulation profile, liver, and kidney function tests were done preoperatively. Preoperative electrocardiogram showed sinus tachycardia and nonspecific ST-T wave changes. The open surgical repair was planned under hypothermic cardiopulmonary bypassFigure 1: (a) Chest X-.Ray PA view showing a radio dense wire extending into inferior vena cava and right atrium. (b) Computerised tomography scan showing evidence of a linear Ra: Right atrium dense wire extending from infrarenal IVC, extending into right ventricle and the tip is seen in superior vena cava suggesting foreign material. (c) Guidewire with vegetation. (d) Right atrium opened with blocked IVC. IVC: Inferior vena cava {"href":"Single Video Player","role":"media-player-id","content-type":"play-in-place","position":"float","orientation":"portrait","label":"Video Clip 1","caption":"","object-id":[{"pub-id-type":"doi","id":""},{"pub-id-type":"other","content-type":"media-stream-id","id":"1_0bc3rv32"},{"pub-id-type":"other","content-type":"media-source","id":"Kaltura"}]} Patient was induced with general anaesthesia and endotracheal intubation carried out after injecting fentanyl 5 mg/kg, midazolam 0.1 mg/kg, and vecuronium 0.1 mg/kg. Five lead electrocardiogram, invasive arterial blood pressure, central venous pressure, temperature, end tidal carbon dioxide, pulse oximetry, and urine output were monitored intraoperatively. Cardiopulmonary bypass (CPB) was established after cannulating ascending aorta and right atrium. Total circulatory arrest was initiated. Right atrium was opened and removal of guidewire with vegetation from right atrial wall and tricuspid valve leaflet were done [Figure 1c and 1d]. Tricuspid valve was checked for tricuspid regurgitation and anteroseptal commissuroplasty was done. Post repair, moderate to severe tricuspid regurgitation was present. CPB was instituted again, and tricuspid valve was repaired. After complete rewarming, patient was weaned off CPB uneventfully. 180 ml of packed red blood cells was transfused intraoperatively. Total duration of surgery was four hours. Patient was shifted to paediatric intensive care unit and was extubated on second postoperative day. Complications pertaining to the retained guide wire include complete loss of wire, injury to the vessel from the wire, fracture of the wire, and bleeding.[1–5] Patients undergoing foreign body removal pose a challenge for the anaesthesiologist as there can be risk of arrhythmia, bleeding causing haemodynamic instability, prolonged aortic cross clamp time, and postbypass myocardial dysfunction. Percutaneous retrieval was not possible in this case due to the extent of guide wire with associated vegetation and risk of its embolisation. Therefore, decision was made for surgical plan to remove guide wire under cardiopulmonary bypass. This case highlights the importance of formulating a plan for the anaesthetic management of patients undergoing guidewire removal and preparedness for postoperative management. Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.

Multiple Anastomotic Dehiscences After the Bentall Procedure for Aortitis Syndrome.

A 53-year-old man with aortitis was transferred to the current hospital for severe cardiogenic shock. He had undergone the Bentall procedure for annulo-aortic ectasia at the age of 30 years and had received steroid therapy following the diagnosis of aortitis. The preoperative 12-lead electrocardiogram showed ST-segment elevation in lead aVR with diffuse ST-segment depression, suggesting coronary malperfusion. Computed tomography (CT) images demonstrated a retrosternal super-giant pseudoaneurysm (Figure 1A-C) and dehiscence of the distal end of the composite graft from the native aorta (Figure 1B).

The influence of electrocardiogram (ECG) filters on the heights of R and T waves in children

Anesthesiologists often compare intraoperative and preoperative electrocardiogram (ECG) waveforms in patients undergoing general anesthesia. In addition, many intraoperative ECG monitors have filters for removing electrocautery noise. In pediatric anesthesiology practice, we often note the appearance of elevated T waves—specifically, an increase in their height—with the use of such filters, even though no actual clinical change has occurred, which possibly leads to misdiagnosis. We investigated changes in R and T wave heights and in the T/R ratio according to the use of the strong (S) versus the diagnostic (D) filtering mode during pediatric anesthesiology. Primary outcomes were the dependence of the heights of the R and T waves on the filter mode and the correlation between rates of change in the R- and T-wave heights and heart rate (HR). In the S mode, the height of the R wave was lower (p = 0.013, η2 = 0.28) and the T/R ratio was higher than the corresponding values in the D mode (χ2 = 20.46, p < 0.001). The T/R ratios were also higher in the S mode than in the D mode, and when the D mode was changed to the S mode during tachycardia, there was a strong correlation between the rate of reduction in the R wave and HR (r = 0. 573, p = 0.041). Significant differences in the heights of the R wave and in the T/R ratio occur when using different intraoperative ECG filtering modes. Specifically, in S mode, a greater relative increase in T wave height may occur due to a significant decrease in R wave height. To avoid spurious diagnoses, anesthesiologists should be familiar with these potentially purely filter-driven changes whenever ECG is intraoperatively monitored.

Preoperative Transthoracic Echocardiography Predicts Cardiac Complications in Elderly Patients with Coronary Artery Disease Undergoing Noncardiac Surgery.

PurposeGuidelines have not recommended routine transthoracic echocardiography (TTE) for elderly patients prior to noncardiac surgery. We aimed to evaluate the significance of preoperative TTE to predict perioperative cardiac complications (PCCs) for elderly patients with coronary artery disease (CAD) undergoing noncardiac surgery.Patients and methodsWe retrospectively reviewed 2204 patients over 65 years of age with CAD who underwent TTE before intermediate- or high-risk noncardiac surgery in a teaching hospital in China between September 2013 and August 2019. The revised cardiac risk index (RCRI) was assessed. PCCs comprised acute coronary syndrome, heart failure, new-onset severe arrhythmia, nonfatal cardiac arrest, and cardiac death. Logistic regression was used to build the prediction model for PCCs. Discrimination was evaluated using receiver operating characteristic curves, and a nomogram of the predictive model was constructed.ResultsPCCs occurred in 189 (8.6%) patients. Multivariable analysis showed that eight clinical risk factors (age, history of myocardial infarction, insulin therapy for diabetes, New York Heart Association classification, preoperative serum creatinine, preoperative electrocardiogram ST-T abnormality and pathological Q wave, and American Society of Anesthesiologists classification) and five TTE parameters (left atrial anteroposterior dimension, left ventricular ejection fraction, left ventricular diastolic dysfunction, pulmonary hypertension, and regional ventricular wall motion abnormality) were associated with PCCs. The receiver operating characteristic curve for the clinical plus TTE model provided better discrimination for PCCs compared with the RCRI model (area under the curve: 0.731 vs 0.564; P < 0.001) and the clinical model (area under the curve: 0.731 vs 0.697, P = 0.001), respectively. The clinical plus TTE model was presented as a prognostic nomogram.ConclusionPreoperative TTE may help predict PCCs in elderly patients with CAD undergoing noncardiac surgery, and the prognostic nomogram from this study appeared to be useful for the assessment of perioperative cardiac risk.

Prognostic value of preoperative electrocardiography in predicting myocardial injury after vascular surgery.

The current European guidelines recommend that a preoperative electrocardiogram (ECG) should be performed routinely in patients scheduled for high-risk surgery. However, the evidence regarding ECG as a predictor of perioperative cardiac complications is weak. To evaluate the association of preoperative ECG with short- and long-term outcomes in patients undergoing high-risk vascular procedures. This was a substudy of the international Vascular events In noncardiac Surgery patIents cohort evaluatioN (VISION) Study and included consecutive patients undergoing vascular procedures in a single tertiary center. In each patient, a preoperative 12-lead ECG was evaluated by two experienced clinicians following the Polish Cardiac Society recommendations. We performed routine perioperative troponin monitoring at five time points (one preoperative and four postoperative measurements) to evaluate whether preoperative ECG abnormalities are associated with myocardial injury after noncardiac surgery (MINS) and 1-year major adverse cardiovascular events (MACE) including cardiac death, myocardial infarction, and stroke. The study group comprised 348 patients, 80.5% of whom were male and the median age (interquartile range [IQR]) was 65 (59-72) years. The incidence of MINS and 1-year MACE was 18.7% and 14.4%, respectively. Multivariable analysis showed that none of the predefined ECG abnormalities (ST depression, left axis deviation, atrial fibrillation, and bundle branch block) was associated with the incidence of MINS or 1-year MACE. This study confirmed that preoperative ECG abnormalities are frequent in patients undergoing high-risk vascular surgery. However, we did not find evidence supporting the relation between preoperative ECG abnormalities and postoperative adverse cardiac outcomes in high-risk patients.

The significance of widely split P waves: a case report

BackgroundP wave morphology on electrocardiogram is often overlooked but indicates abnormal cardiac conduction from various etiologies. Split P waves on electrocardiogram have been reported previously but not in a perioperative setting.Case presentationA 69-year-old Caucasian male patient with widely split P waves on his preoperative electrocardiogram was scheduled for a reimplantation right total hip replacement under a combined spinal–general anesthetic technique. The patient was evaluated prior to surgery by a cardiologist and the preoperative anesthesia clinic without any comment on the abnormal P wave morphology on electrocardiogram. The patient was cleared to proceed with anesthesia and surgery. Following induction of general anesthesia, his cardiac rhythm changed to a Mobitz type II pattern. The surgical procedure was cancelled, and a permanent cardiac pacemaker was inserted.ConclusionsAnesthesiologists should be aware that the presence of widely split P waves on electrocardiogram indicates the presence of atrial conduction abnormalities, likely from an ischemic or infiltrative process that can lead to more serious cardiac arrhythmias. P wave morphology should be observed and noted during the perioperative period for all patients.

A new method for right ventricular lead implantation into the intraventricular septum

Abstract Funding Acknowledgements Type of funding sources: None. Background Right ventricular (RV) lead placement into the interventricular septum is only accurate in 16–48% of cases under conventional fluoroscopic guidance. A previous report showed the importance of individualized left anterior oblique (LAO) projection to improve the success rate of RV lead placement into the interventricular septum. However, this procedure is complicated. We sought to investigate the preprocedural predictors of individualized LAO projection. Methods We assessed the relationship between preoperative electrocardiographic parameters and the angle of the interventricular septum obtained using thoracic computed tomography (CT). Results In the retrospective derivation cohort group (n=39), the mean angle of individualized LAO assessed by thoracic CT was 53.1±8.9°, and the preoperative electrocardiogram QRS axis was strongly correlated with the interventricular septum axis detected by thoracic CT (R2 = 0.490). In contrast, the preoperative electrocardiographic transitional zone was not associated with the interventricular septum axis (R2 = 0.041, P = 0.78). Using individual LAO projection derived from the preoperative electrocardiogram QRS axis, it was confirmed that the RV lead was placed in the interventricular septum during the pacemaker procedure in the prospective internal validation group (n=30). The success rate for placing the RV lead into the interventricular septum was significantly improved in the internal validation cohort group (93% vs. 64%, P &amp;lt; 0.05). In addition, the N-terminal pro-brain natriuretic peptide level decreased significantly after surgery in the interventricular septal indwelling group. Conclusions Individualized LAO angle derived from the preoperative electrocardiogram QRS axis is a new useful and simple method for RV lead implantation into the interventricular septum.