Postoperative Mean Arterial Pressure Research Articles

Effectiveness of ESP Block as Post-Operative Analgesia in Comparison with Opioid Analgesia for Laparoscopic Cholecystectomy

Background: In our country, the role of Erector Spinae Plane Block (ESP) for post-operative analgesia in laparoscopic cholecystectomy has not yet been investigated. As a result, the study was designed to compare the effectiveness of ESP block as post-operative analgesia to opioid analgesia for pain control following Laparoscopic Cholecystectomy. Objectives: The aim of the study was to evaluate the effectiveness of ESP block as post-operative analgesia in comparison with opioid analgesia. Methods: This cross-sectional comparative study was conducted at the department of surgery with collaboration of department of Anaesthesiology in CMH for 6 months of period. Before commencement of the study formal ethical clearance was taken from the Ethical Committee of DGMS Army. Total 60 patients, scheduled for laparoscopic cholecystectomy under general anesthesia were included in this study and randomly divided into two groups (30 patients in each group). total 30 Patients, received both GA and ultrasound guided ESP block were assigned as group E and 30 Patients, received GA and opioid analgesia were in group N. Informed written consent was taken from each subject and ethical measures were followed strictly in whole study. Following data collection, data were analyzed by the SPSS 24. Results: In terms of age, sex, BMI and ASA grading, the two groups had identical demographic features (p>0.05 in all cases). There was no significant difference in pre-operative, post-operative, or recovery room heart rate (p>0.05) or mean arterial pressure (p>0.05). In the recovery room, group E has significantly less pain than group N (3.67±0.802 vs 4.3±0.877; p<0.05). A similar improvement was seen in group E at 6, 12 and 24 hours (p<0.05 in all follow ups). Post-operative analgesic consumption was similarly higher in group N at 1, 12, and 24 hours (p<0.05 in all follow up). Except for nausea, which was more common in group N (p<0.05), complications were similar in both groups. ......

Safety and Efficacy of Ultrasound-Guided Combined Segmental Thoracic Spinal Epidural Anesthesia in Abdominal Surgeries and Laparoscopic Procedures: A Prospective Randomized Clinical Study.

Thoracic segmental spinal anesthesia (SA) may be a good alternative to general anesthesia (GA) for abdominal operations and laparoscopic procedures, especially in high-risk patients. The aim of this study was to investigate the safety and efficacy of thoracic segmental SA vs GA during abdominal operations and laparoscopic procedures. This study was conducted at our university hospital and involved a total of 46 patients who underwent abdominal operations and laparoscopic procedures. The study period spanned from January 15, 2022, to October 15, 2022. Patients were divided into 2 groups: Group 1 (n = 23) received standard GA, and group 2 (n = 23) received thoracic segmental SA. A combination of 10 mg of hyperbaric bupivacaine 0.5% and 25 μg of fentanyl was injected through the spinal needle. The epidural catheter was then threaded through the Tuohy needle after withdrawal of the spinal needle to keep only 4 cm up in the epidural space. Demographic data, both intra and postoperative hemodynamic parameters, were monitored. Postoperatively, pain in both groups was treated with intravenous (IV) morphine by patient controlled analgesia (PCA), PCA settings were 1 mg morphine/mL, no background infusion, bolus dose 2 mL and lockout interval 15 min. Postoperative, both resting VAS and VAS during cough were measured for all patients at fixed intervals, and all patients were followed up for postoperative complications. No significant variation was found in demographic data. Intra and postoperative mean arterial pressure (MAP) and heart rate (HR) measurements were higher in group 1 than in group 2 but without a statistically significant difference (P < 0.029). Early postoperative VAS values and discharge time from the postanesthesia care unit (PACU) were significantly reduced in group 2 than in group 1 (P < 0.001). The number of patients asked for analgesia and total opioid consumption were substantially reduced in group 2 than in group 1. Also, the time of the first analgesia request and patient satisfaction were substantially greater in group 2 than in group 1. Combined thoracic spinal/epidural block results in stable hemodynamics, longer postoperative analgesia with fewer side effects, and greater surgeon and patient satisfaction in patients undergoing abdominal operations and laparoscopic procedures.

Association between postoperative hypotension and acute kidney injury after noncardiac surgery: a historical cohort analysis.

The extent to which postoperative hypotension contributes to renal injury remains unclear, much less what the harm thresholds might be. We therefore tested the primary hypothesis that there is an absolute hypotensive arterial pressure threshold for acute kidney injury during the initial seven days after noncardiac surgery. We conducted a single-centre historical cohort analysis of adults who had noncardiac surgery and had creatinine recorded preoperatively and postoperatively. Our exposure was the lowest postoperative mean arterial pressure, defined as the average of the three lowest postoperative pressure measurements. Our primary analysis was the association between the lowest mean arterial pressure and acute kidney injury, defined according to Kidney Disease: Improving Global Outcomes initiative criteria. Our analysis was adjusted for potentially relevant confounding factors including intraoperative hypotension. Among 64,349 patients analyzed, 2,812 (4.4%) patients had postoperative acute kidney injury. Each 5-mmHg decrease in the lowest mean arterial pressure was associated with a 28% (97.5% confidence interval [CI], 23 to 32; P < 0.001) increase in the odds of acute kidney injury for lowest mean arterial pressures <80mmHg. Higher lowest pressures were not associated with acute kidney injury (odds ratio, 1.08; 97.5% CI, 0.99 to 1.17; P = 0.04) for each 5-mmHg decrease in the lowest mean arterial pressure. Postoperative hypotension, defined as the lowest postoperative mean arterial pressure <80mmHg, was associated with acute kidney injury after noncardiac surgery. A prospective trial will be required to determine whether the observed association is causal and thus amenable to modification.

One-Year Survival for Developing Acute Kidney Injury in Adult Patients with AMI Cardiogenic Shock Receiving Venoarterial Extracorporeal Membrane Oxygenation.

The incidence of cardiogenic shock cases treated with veno-arterial extracorporeal membrane oxygenation (VA-ECMO) support has been on the rise. Acute kidney injury (AKI) is a significant complication of cardiogenic shock and a frequent serious complication in patients requiring ECMO-supported therapy. AKI is strongly associated with unfavorable patient prognosis. However, there is a paucity of data on the influence of AKI on the prognosis of patients with acute myocardial infarction complicated by cardiogenic shock (AMI-CS) who are receiving ECMO support, particularly with regard to long-term outcomes. This retrospective observational study included 103 patients in the People's Hospital of Guangxi Zhuang Autonomous Region from January 2017 and June 2022. AKI was defined according to Kidney Disease Improving Global Outcome (KDIGO) criteria. Cox regression and logistic regression were used to identify risk factors. In this study, the incidence of AKI was 63.11%, with AKI stage 1, 2, and 3 accounting for 21.36%, 12.62%, and 29.13%, respectively. Patients with severe AKI had significantly higher in-hospital mortality (43.33% vs 27.40%, P < 0.001), 30-day mortality (60.00% vs 31.51%, P = 0.001), and 1-year mortality (63.67% vs 34.25%, P<0.001) than those without severe AKI. Furthermore, severe AKI significantly increased the risk of one-year mortality (HR 10.816, CI 3.118-37.512, P<0.001). Baseline serum creatinine, baseline platelet, and active cardiopulmonary resuscitation were independent predictors of one-year mortality. In addition, baseline white blood cell count, baseline aspartate aminotransferase, baseline alanine aminotransferase (ALT), baseline serum creatinine, preoperative lactate, and postoperative mean arterial pressure were independent risk factors of severe AKI during hospitalization. In patients with AMI-CS receiving ECMO support, AKI is highly prevalent. Development of severe AKI significantly increased the risk of one-year mortality.

Influence of perioperative blood pressure regulation on postoperative delirium in patients undergoing head and neck free flap reconstruction

BackgroundPostoperative delirium (POD) is a serious complication in patients undergoing microvascular head and neck reconstruction. Whether intraoperative and postoperative blood pressure regulation are risk factors for POD remains unclear. This study aimed to highlight the relationships between intraoperative and postoperative blood pressure regulation and POD in microvascular head and neck reconstruction.MethodsData from 433 patients who underwent microvascular head and neck reconstruction at our department of oral and maxillofacial surgery between 2011 and 2019 were retrospectively analyzed. The 55 patients with POD were matched with 55 patients without POD in terms of tracheotomy, flap type, and flap location, and the intraoperative and postoperative systolic and mean blood pressure values were compared between the two groups.ResultsPatients with POD showed lower intraoperative and postoperative minimum mean arterial pressure (MAP) values than patients without POD (60.0 mmHg vs. 65.0 mmHg, p < 0.001; and 56.0 mmHg vs. 62.0 mmHg, p < 0.001; respectively). A lower intraoperative minimum MAP value was identified as predictor for POD (odds ratio [OR] 1.246, 95% confidence interval [CI] 1.057–1.472, p = 0.009). The cut-off value for intraoperative MAP for predicting POD was ≤ 62.5 mmHg (area under the curve [AUC] 0.822, 95% CI 0.744–0.900, p < 0.001).ConclusionsMaintaining a stable intraoperative minimum MAP of > 62.5 mmHg could help to reduce the incidence of POD in microvascular head and neck reconstruction.

Hidden Blood Loss and Its Possible Risk Factors in Full Endoscopic Lumbar Interbody Fusion.

Full endoscopic lumbar interbody fusion (Endo-LIF) is a representative recent emerging minimally invasive operation. The hidden blood loss (HBL) in an Endo-LIF procedure and its possible risk factors are still unclear. The blood loss (TBL) was calculated by Gross formula. Sex, age, BMI, hypertension, diabetes, ASA classification, fusion levels, surgical approach type, surgery time, preoperative RBC, HGB, Hct, PT, INR, APTT, Fg, postoperative mean arterial pressure, postoperative heart rate, Intraoperative blood loss (IBL), patient blood volume were included to investigate the possible risk factors by correlation analysis and multiple linear regression between variables and HBL. Ninety-six patients (23 males, 73 females) who underwent Endo-LIF were retrospective analyzed in this study. The HBL was 240.11 (65.51, 460.31) mL (median [interquartile range]). Fusion levels (p = 0.002), age (p = 0.003), hypertension (p = 0.000), IBL (p = 0.012), PT (p = 0.016), preoperative HBG (p = 0.037) were the possible risk factors. Fusion levels, younger age, hypertension, prolonged PT, preoperative HBG are possible risk factors of HBL in an Endo-LIF procedure. More attention should be paid especially in multi-level minimally invasive surgery. The increase of fusion levels will lead to a considerable HBL.

Defining a postoperative mean arterial pressure threshold in association with acute kidney injury after cardiac surgery: a prospective observational study.

Acute kidney injury (AKI) is a common but fatal complication after cardiac surgery. In the absence of effective treatments, the identification and modification of risk factors has been a major component of disease management. However, the optimal blood pressure target for preventing cardiac surgery-associated acute kidney injury (CSA-AKI) remains unclear. We sought to determine the effect of postoperative mean arterial pressure (MAP) in CSA-AKI. It is hypothesized that longer periods of hypotension after cardiac surgery are associated with an increased risk of AKI. This prospective cohort study was conducted on adult patients who underwent cardiac surgery requiring cardiopulmonary bypass at a tertiary center between October 2018 and May 2020. The primary outcome is the occurrence of CSA-AKI. MAP and its duration in the ranges of less than 65, 65 to 74, and 75 to 84mmHg within 24h after surgery were recorded. The association between postoperative MAP and CSA-AKI was examined by using logistic regression. Among the 353 patients enrolled, 217 (61.5%) had a confirmed diagnosis of CSA-AKI. Each 1h epoch of postoperative MAP less than 65mmHg was associated with an adjusted odds ratio of 1.208 (95% CI, 1.007 to 1.449; P = 0.042), and each 1h epoch of postoperative MAP between 65 and 74mmHg was associated with an adjusted odds ratio of 1.144 (95% CI, 1.026 to 1.275; P = 0.016) for CSA-AKI. A potentially modifiable risk factor, postoperative MAP less than 75mmHg for 1h or more is associated with an increased risk of CSA-AKI.

Comparison of the Efficacy between Femoral Nerve Block and Fascia Iliaca Compartment Block for Postoperative Analgesia in Patients after Knee Surgery

Background: Moderate to severe pain develop after knee surgery results prolong hospital stay and delay return to normal daily activities. Various analgesic modalities have been used for postoperative analgesia in patients undergoing knee surgery. Both femoral nerve block (FNB) block and fascia iliaca compartment block (FIB) are used routinely for postoperative pain relief in patients undergoing knee surgery. Objectives: To compare the efficacy of postoperative analgesia of FNB &amp; FIB in postoperative period among patients undergoing knee surgery under sub- arachnoid block. Methods: This Randomized Clinical Trial was performed in Combined Military Hospital (CMH), Dhaka from July 2020 to December 2020. Forty patients scheduled for routine knee surgery under sub-arachnoid block belonging to ASA class I, II and III were included in the study and randomly divided into two groups with 20 patients in each group. At the end of surgery, In Group A (n= 20) femoral nerve block was employed &amp; in Group B (n=20) fascia iliaca compartment block was employed. Results: Significant relief of pain occurred in recovery room in group B than group A (3.67±0.802 vs 4.3±0.877; p&lt;0.05). This improvement was noticed in group B at 6 and 24 hours follow up (p&lt;0.05 in all follow up). Post-operative analgesic consumptions was also lower in group B at 1, 12 &amp; 24 hours follow up (p&lt;0.05 in all follow up). Demographic characteristics were similar across the two groups in terms of age, sex, BMI and ASA grading (p&gt;0.05 in all cases). No significant difference was noted in both pre-operative, post-operative and recovery room heart rate (p&gt;0.05) and mean arterial pressure (p&gt;0.05). Complication was similar in both groups. Conclusion: Fascia iliaca compartment block (FIB) for management of post-operative analgesia in knee surgery is more effective than femoral nerve block (FNB).

Preliminary Experience of Extracorporeal Cytokine Hemoadsorption during Left Ventricular Assist Device Implantation in Cardiogenic Shock Patients.

Systemic inflammation due to cardiogenic shock is associated with vasoplegia leading to organ hypoperfusion, right heart failure, and poor clinical outcome. Extracorporeal cytokine hemoadsorption emerged to attenuate excessive levels of inflammatory cytokines, potentially improving patient outcomes. Nevertheless, its prognostic impact during high-risk left ventricular assist device (LVAD) implantation remains unknown. In total, 40 consecutive patients with advanced heart failure underwent continuous-flow LVAD implantation at our institution between 2018 and 2020. Out of 25 high-risk patients in cardiogenic shock (Interagency Registry for Mechanically Assisted Circulatory Support profile 1 and 2), 9 patients (CytoSorb group) underwent LVAD implantation with and 16 patients (control group) without simultaneous cytokine hemoadsorption during cardiopulmonary bypass. Besides preoperative patient characteristics, postoperative lactate clearance, vasopressor administration and mean arterial pressure, perioperative complication, and 30-day mortality rates were retrospectively analyzed. Apart from an increased rate of reoperations within the CytoSorb group, baseline characteristics including the severity of ventricular dysfunction and consecutive signs of end-organ failure were similar in both groups. Preoperative short-term mechanical circulatory support bridging was comparable (66.7 vs. 75%; p = 0.66) prior to LVAD implantation. Procedural characteristics including intraoperative volume management and postoperative vasopressor administration were similar in both groups. There was no difference regarding postoperative lactate clearance, although postoperative mean arterial pressure was significantly higher in the control group (71.3 vs. 57.4 mm Hg; p < 0.01). Furthermore, the 30-day mortality rate was significantly higher in the CytoSorb group (33.3 vs. 0.0%; p = 0.01). Extracorporeal cytokine hemoadsorption during high-risk LVAD implantation was not associated with a decrease of postoperative vasopressor support, improved hemodynamics, or an accelerated lactate clearance.

Ultrasound-guided interscalene block is effective for anesthesia and postoperative analgesia for clavicle fracture surgery

Background &amp; Objective: General anesthesia is commonly used during clavicular fracture surgery; however, it has been associated with hemodynamic fluctuations, airway and respiratory problems, stress response, and postoperative nausea and vomiting. We assessed the effectiveness and side effects of ultrasound-guided interscalene block when used for anesthesia and postoperative analgesia for clavicle fracture surgery.&#x0D; Methodology: This study was conducted on 48 patients who were planned for clavicle fracture surgery. Patients were given premedication with midazolam 0.05 mg/kg and pethidine 0.5-1 mg/kg intramuscularly. Patients received ultrasound-guided interscalene block using nerve stimulator and 0.5% ropivacaine 30 ml or bupivacaine 0.375%. Postoperatively, almost all patients received non-steroidal anti-inflammatory drugs (NSAIDs) (COX–1 or COX–2). Postoperative pain was evaluated using a visual analog scale (VAS) at 12, 24, 36, and 48 h postoperatively. Patients received a rescue dose of intravenous fentanyl when the VAS &gt; 4. Block was successful if the surgery was completed without shifting to general anesthesia. The data was analyzed using the T-test and Man Whitney-test using SPSS 20.&#x0D; Result: 95.83% of patients received a successful block. The mean pre-operative VAS was 3.48 ± 1.27 and significantly decreased in the post-operative period; 1.48 ± 0.77 (12 h post-op), 1.79 ± 1.05 (24 h post-op), 1.21 ± 0.41 (36 h postop), and 1.04 ± 0.20 (48 h postoperative) (p=0.000). The preoperative and postoperative mean arterial pressure (MAP) and pulse rate of the patients remained stable. There was no incidence of nausea, vomiting, or other complications.&#x0D; Conclusion: Ultrasound-guided interscalene block is effective and safe as an anesthetic and for postoperative analgesia in clavicle fracture surgery.&#x0D; Key words: Clavicular fracture; Interscalene block; Analgesia; Anesthesia&#x0D; Cittion: Susila D, Laksono RM. Ultrasound-guided interscalene block is effective for anesthesia and postoperative analgesia for clavicle fracture surgery. Anaesth. pain intensive care 2021;26(1):25–30&#x0D; DOI: 10.35975/apic.v26i1.1762&#x0D; Received: May 6, 2921, Reviewed: November 5, 2021, Accepted: December 21, 2021

Risk Factors and Outcomes of Acute Kidney Injury after Type A Aortic Dissection Surgery at A Tertiary Care Hospital

Objective: This study aimed to determine the risk factors predisposing to postoperative acute kidney injury (AKI) after type A aortic dissection repair; regarding patient-related, surgery-related and anesthesia-related factors.Material and Methods: A retrospective cohort study was conducted in patients who underwent type A aortic dissection repair under cardiopulmonary bypass (CPB), during the periods from January 2008 and December 2019. Patient-related, surgery-related and anesthesia-related factors were evaluated for association with AKI. AKI was defined by the Kidney Disease: Improving Global Outcomes criteria. The outcomes and mortality of AKI were also investigated.Results: Included were 95 patients, and the incidence of AKI was 65.3%. The 30-day mortality resulted only in the AKI group (14.9%). From multivariate logistic regression analysis, receiving intraoperative cryoprecipitate (odd ratio; OR 14.18; 95% confidence interval (CI), 3.27-61.5) and PRC transfusion (OR 1.001; 95% CI, 1.0005-1.002) in ICU were the risk factors for AKI. The protective factors were: higher preoperative serum bicarbonate levels (OR 0.83; 95% CI, 0.70- 0.99), higher volume of urine output during CPB (OR 0.71; 95% CI, 0.55-0.91) and higher immediate postoperative mean arterial pressure (OR 0.95; 95% CI, 0.92-0.98). Thirty-day mortality was significantly higher in the AKI group (14.5% vs 0%; p-value=0.025), and 15.0% of patients required renal replacement therapy.Conclusion: The higher level of three factors including preoperative serum bicarbonate levels (&gt;23 mmol/l), volume of urine output during CPB and immediate postoperative mean arterial pressure (&gt;81 mmHg) are likely to be the protective factors of AKI.

Comparison of Thoracic Epidural Analgesia and Thoracic Paravertebral Block Applications in the Treatment of Acute Pain After Thoracotomy in Geriatric Patients.

BackgroundThoracic epidural analgesia (TEA) and thoracic paravertebral block (TPVB) are commonly used in geriatric patients for pain management after thoracotomy. In this study, we aimed to investigate the effect of TEA and TPVB on postoperative analgesia in geriatric patients who underwent thoracotomy.MethodologyPostoperative analgesia follow-up files of patients over 65 years of age who underwent thoracotomy were analyzed retrospectively. Patient’s demographic data, diagnosis, type of surgery, postoperative 24-hour mean arterial pressure (MAP), heart rate, respiratory rate, peripheral oxygen saturation, static/dynamic visual analog scale (VAS) scores, need for additional analgesics, global pain assessment, and side effects such as nausea, vomiting, hypotension, bradycardia, and respiratory depression were examined. The patients were divided into two groups: those treated with TEA (Group 1) and those treated with TPVB (Group 2).ResultsThere was no statistically significant difference between the groups in terms of demographic data (p > 0.05). MAP in the TEA group was statistically significantly lower than in the second and sixth-hour TPVB group (p = 0.008, p < 0.001). VAS static scores in the TEA group were statistically significantly lower at 30 minutes (p = 0.001), and at one, two, six, twelve, and twenty-four hours compared to the TPVB group (p < 0.001, except at 30 minutes). VAS dynamic scores were statistically significantly lower in the TEA group at 30 minutes, and at one, two, six, twelve, and twenty-four hours compared to the TPVB group (p < 0.001). There was no statistically significant difference between the groups in terms of nausea, vomiting, hypotension, and bradycardia (p > 0.05). The use of additional analgesics in the TEA group was statistically significantly lower than in the TPVB group (p < 0.001).ConclusionsMore effective postoperative analgesia results with stable hemodynamic conditions were observed in geriatric patients who underwent TEA for thoracotomy compared to TPVB. Regarding side effects, although there was a lower incidence in TPVB, this was not statistically significant when compared to TEA. TEA, as a component of the multimodal analgesia approach, can be accepted as a safe and effective method in the elderly patient group who underwent thoracotomy.

Intraoperative blood pressure lability carries a higher risk of headache after carotid endarterectomy

ObjectiveCerebral hyperperfusion syndrome (CHS) is a rare but potentially devastating complication after carotid endarterectomies (CEA). Its symptoms range from new-onset unilateral headache (HA) to intracranial hemorrhage (ICH). Risk factors for CHS in the literature to date have not yet yielded a consensus. This study examines intraoperative and postoperative blood pressure variations as potential risk factors for HA. MethodsA single-center retrospective review at a tertiary care center from January 2010 to November 2019 was performed. Inclusion criteria were all patients undergoing CEA for symptomatic or asymptomatic carotid disease. Patients with incomplete charts were excluded. Primary endpoints were new-onset unilateral HA or postoperative ICH. Data on intraoperative and postoperative mean arterial pressure (MAP), systolic blood pressure (SBP), the mode of endarterectomy, shunt placement, and contralateral carotid status were collected. ResultsThere were 735 patients who met the inclusion criteria: 430 patients underwent modified eversion CEA (59%) and 305 patients for patch angioplasty (42%). The incidence of HA was 19% (n = 142) in our total cohort. Of the 19% with HA, 1.5% (n = 11) demonstrated no relief with analgesics and strict blood pressure control; noncontrast head computed tomography scans were performed subsequently. One patient (0.1%) had an ipsilateral ICH. Univariate analysis demonstrated that greater intraoperative MAP peak had the highest risk for HA (odds ratio [OR], 1.014; 95% confidence interval [CI], 1.007-1.022; P = .0002), followed by intraoperative MAP variability (OR, 1.011; 95% CI,1.005-1.018; P ≤ .0008), and peak intraoperative SBP (OR, 1.01; 95% CI, 1.004-1.015; P = .0011). An unpaired Student t test identified change in intraoperative MAP (P < .005), change in the SBP (P < .005), and peak SBP (P < .001) were significantly associated with HA. Interestingly, there was no significant difference between postoperative MAP variability and HA (P = .1). The mode of endarterectomy showed no statistically significant difference in risk for developing HA (OR, 1.165; 95%; 95% CI, 0.801-1.694; P = .42). ConclusionsGreater intraoperative variability in blood pressures are significantly associated with a higher risk of HA. Adhering to stricter intraoperative blood pressure parameters and limiting blood pressure variability may be beneficial at decreasing the incidence of CHS and its complications.

Postoperative Hypotension and Adverse Clinical Outcomes in Patients Without Intraoperative Hypotension, After Noncardiac Surgery.

Postoperative hypotension (POH) is associated with major adverse events. However, little is known about the association of blood pressure thresholds and outcomes in postoperative patients without intraoperative hypotension (IOH) on the general-care ward. We evaluated the association of POH with major adverse cardiac or cerebrovascular events (MACCE) in patients without IOH. This retrospective analysis included 67,968 noncardiac patient-procedures (2008-2017) for patients discharged to the ward with postoperative mean arterial pressure (MAP) readings, managed for ≥48 hours postsurgery, with no evidence of IOH. The primary outcome was 30-day MACCE evaluated by postoperative MAP thresholds: ≤75, ≤65, and ≤55 mm Hg (POH defined as a single measurement below threshold). Secondary outcomes included all-cause mortality (30-/90-day), 30-day acute myocardial infarction, 30-day acute ischemic stroke, 30-day readmission, 7-day acute kidney injury, and 30-day readmission. Associations between POH and adverse events were also evaluated in a cohort (#2) of 16,034 patient-procedures with IOH (intraoperative MAP ≤65 mm Hg). In patients without IOH, exposure to POH was not associated with MACCE at any investigated MAP threshold (P < .016 was considered significant: ≤75 mm Hg, hazard ratio [HR] 1.18 [98.4% confidence interval {CI} 0.99-1.39], P = .023; ≤65 mm Hg, HR 1.18 [0.99-1.41], P = .028; ≤55 mm Hg, HR 1.23 [0.90-1.71], P = .121); however, associations were observed at all MAP thresholds for secondary outcomes of acute kidney injury and 30-day readmission, for 30-/90-day mortality for MAP ≤65 mm Hg, and 90-day mortality for MAP ≤55 mm Hg, compared to those without POH. No associations were detected between POH and secondary outcomes of acute ischemic stroke or acute myocardial infarction at any MAP threshold. No interaction between POH and IOH was found when we evaluated the association of POH on outcomes in the data set including all patients, regardless of IOH status (P values for interaction terms nonsignificant). When the interaction term was utilized, the association between POH without IOH and MACCE was significant for MAP ≤75 mm Hg (HR 1.20 [1.01-1.41]) and MAP ≤65 mm Hg (HR 1.21 [1.02-1.45]), but not MAP ≤55 mm Hg. Cohort #2 (POH with IOH) showed largely similar results for MACCE: not significant for MAP ≤75 and ≤65 mm Hg, but significant for MAP ≤55 mm Hg (HR 1.53 [1.05-2.22], P = .006). POH in patients without IOH was not associated with MACCE at any MAP investigated. No interaction was identified between POH and IOH. Large prospective randomized trials are necessary to develop better evidence and inform clinicians the value of postoperative blood pressure management.

Intranasal Dexmedetomidine Reduces Postoperative Opioid Requirement in Patients Undergoing Total Knee Arthroplasty Under General Anesthesia

BackgroundTotal knee arthroplasty (TKA) causes severe pain, and strong opioids are commonly used in postoperative analgesia. Dexmedetomidine is a novel alpha-2-adrenoceptor-activating drug indicated for procedural sedation, but previous studies have shown clinically relevant analgesic and antiemetic effects. We evaluated retrospectively the effect of intranasal dexmedetomidine on the postoperative opioid requirement in patients undergoing TKA. MethodsOne hundred and fifty patients with ASA status 1-2, age between 35 and 80 years, and scheduled for unilateral primary TKA under total intravenous anesthesia were included in the study. Half of the patients received 100 μg of intranasal dexmedetomidine after anesthesia induction, while the rest were treated conventionally. The postoperative opioid requirement was calculated as morphine equivalent doses for both groups. The effect of dexmedetomidine on postoperative hemodynamics, length of stay (LOS), and incidence of postoperative nausea and vomiting (PONV), was evaluated. ResultsThe cumulative postoperative opioid consumption was significantly reduced in the dexmedetomidine group compared to the control group (−28.5 mg, 95% CI 12-47 mg P < .001). The reduction in cumulative opioid dose was significantly different between the groups already at 2, 12, 24, and 36 h postoperatively (P < .001). LOS was shorter in the dexmedetomidine group (P < .001), and the dexmedetomidine group had lower postoperative mean arterial pressure and heart rates were lower compared to the control group (P < .001). The incidence of PONV did not differ between the groups (P = .64). ConclusionIntraoperatively administered intranasal dexmedetomidine reduces postoperative opioid consumption and may be associated with a shorter hospital stay in patients undergoing TKA under general anesthesia.

Sequential analysis for median effective dose of Dexmedetomidine in upper limb Lidocaine intravenous regional anesthesia

ABSTRACT Background Auxiliary drugs augment the effect of local anesthetic in intravenous regional anesthesia (IVRA). The aim of our study was to estimate the median effective dose (ED50) of Dexmedetomidine in elective upper limb Lidocaine 0.5% IVRA. Method A prospective, double-blind, sequential study using modified Dixon’s up and down method. Thirty patients scheduled for minor upper limb surgeries were recruited in the Study, however, we ended up analyzing data of 26 patients due to protocol violation. The first patient in this sequential trial was randomly selected and received a mixed solution of 0.5% lidocaine and 0.4 µg/kg of dexmedetomidine, with 0.1 µg/kg dose interval. If IVRA outcome was satisfactory, the dose went down for the next patient by 0.1 µg/kg. Vice versa, if the outcome was unsatisfactory, the dexmedetomidine dose was stepped up by 0.1 µg/kg. Sensory and motor block onset, recovery times, hemodynamic variables, surgical and tourniquet VAS scores and time to first analgesic request were recorded. Results The series of patient responses to IVRA was satisfactory in 11 patients (42.3%) and unsatisfactory in 15 patients (57.6%) due to either surgical pain in 6 patients or tourniquet pain in the remaining 9 patients. In patients with satisfactory response to IVRA, intraoperative and postoperative mean arterial pressure and heart rate, compared with baseline (just prior to inflating the proximal cuff) measurement, showed no statistically significant differences (P = 0.754 and 0.324, respectively). Intergroup comparison of Patients with unsatisfactory response to IVRA time to first analgesic request showed no statistical difference (P > 0.05). Conclusion the ED 50 of Dexmedetomidine (95% confidence interval, CI) as adjuvant for satisfactory 0.5% lidocaine IVRA was 0.7 µg/kg (0.6–0.8).

Risk factors for spinal cord injury in patients undergoing frozen elephant trunk technique for acute aortic dissection.

The purpose of this study was to evaluate the risk factors for spinal cord injury (SCI) in patients with acute aortic dissection undergoing surgery with frozen elephant trunk technique (FET). From December 2014 to February 2018, 17 patients with acute aortic dissection underwent surgical treatment of the aortic arch with FET. SCI occurred in 3 patients. Risk factors for SCI were evaluated. Mean age of the patients was 56years and 88.2% were male. The ratio of true lumen to total aortic diameter at the level of carina (before: 0.48 vs. after: 0.75, P < 0.001), aortic valve (before: 0.47 vs. after: 0.67, P = 0.001), and celiac artery (before: 0.48 vs. after: 0.68, P = 0.003) increased after surgery. There were no significant differences in perioperative minimum hemoglobin level and postoperative mean arterial pressure between patients with and without SCI. However, patients with SCI had higher creatinine level before surgery (SCI: 1.32mg/dL vs. no SCI: 0.81mg/dL, P = 0.023). Although there was no difference in number of patent intercostal arteries before surgery, those originating from the true lumen were fewer in patients with SCI (SCI: 2.7 vs. no SCI: 8.6, P = 0.021). Furthermore, with entry closure, significant decrease in patency was observed in intercostal arteries originating from the false lumen (before: 3.1 vs. after: 1.0, P < 0.001). FET was useful in entry closure. However, FET in patients with higher creatinine level and those who may have significant spinal cord perfusion from the false lumen could be a risk factor for postoperative SCI.

Impact of postoperative mean arterial pressure on the incidence of postoperative complications after hepatic resection for primary liver malignancy.

We conducted this study to evaluate the impact of the postoperative mean arterial pressure (MAP) on surgical complications after hepatic resection. The subjects of this study were 199 patients who underwent hepatic resection for primary liver malignancy between 2004 and 2013. A clinically relevant postoperative complication was defined as a Clavien-Dindo grade ≥ III complication. Based on an MAP cut-off value of 81.1mmHg, the patients were grouped as follows: low MAP on both postoperative days (PODs) 1 and 2 (continuously low MAP), normal MAP on both PODs 1 and 2 (normal MAP), and others (transiently low MAP). The continuously low MAP group had the highest incidence of complications and the normal MAP group had the lowest incidence of complications compared with the expected incidence for this cohort (p < 0.01 and p = 0.01, respectively). Multivariate analysis revealed that both a continuously and transiently low MAP were independent predictors of postoperative complications (p = 0.03 and p < 0.01, respectively). Among the subtypes of complications, a low MAP had a significant relationship with ascites/pleural effusion and respiratory complications (p < 0.01 and p = 0.03, respectively). A low MAP on POD 1 and/or 2 is an independent predictor of postoperative complications.

Postoperative Hypotension and Surgical Site Infections After Colorectal Surgery: A Retrospective Cohort Study.

Hypotension compromises local tissue perfusion, thereby reducing tissue oxygenation. Hypotension might thus be expected to promote infection. Hypotension on surgical wards, while usually less severe than intraoperative hypotension, is common and often prolonged. In this retrospective cohort study, we tested the hypotheses that there is an association between surgical site infections and low postoperative time-weighted average mean arterial pressure and/or postoperative minimum mean arterial pressure. We considered patients who had colorectal surgery lasting ≥1 hour at the Cleveland Clinic between 2009 and 2013. We defined blood pressure exposures as time-weighted average (primary) and minimum mean arterial pressure (secondary) within 72 hours after surgery. We assessed associations between continuous blood pressure exposures with a composite of deep and superficial surgical site infection using separate severity-weighted average relative effect generalized estimating equations models, each using an unstructured correlation structure and adjusting for potentially confounding variables. A total of 5896 patients were eligible for analysis. Time-weighted mean arterial pressure and surgical site infection were not significantly associated, with an estimated odds ratio (95% CI) of 1.03 (0.99-1.08) for a 5-mm Hg decrease (P = .16). However, there was a significant inverse association between minimum postoperative mean arterial pressure and infection, with an estimated odds ratio of 1.08 (1.03-1.12) per 5-mm Hg decrease (P = .001). Postoperative time-weighted mean arterial pressure was not associated with surgical site infection, but lowest postoperative mean arterial pressure was. Whether the relationship is causal remains to be determined.

Safety of prone jackknife position in ambulatory anorectal surgery

Background and Objectives: The objectives of this study were to determine morbidity and mortality rates of ambulatory anorectal surgeries in prone jackknife position. Patients and Methods: Retrospective chart analysis on 210 patients undergoing ambulatory anorectal surgery in the prone jackknife position. The primary endpoint studied was mortality and complication rates. Other factors analyzed were age, sex, clinical diagnosis, procedure, past medical history, American Society of Anesthesiologists physical status classification, current smoking status, mean pre- and post-operative mean arterial pressure (MAP), mean minimum intraoperative MAP, minimum intraoperative O2saturation, estimated blood loss, fluids given, anesthesia duration, antibiotic administration, and days to discharge and whether there were any readmissions within 30 days. To assess significant differences between pre-, intra-, and post-operative mean arterial pressure, one-way ANOVA was used. Results: There was no mortality within 30 days of surgery. Complication rate was 3.3% with urinary retention being the most common, comprising 42% of all complications. Thirty-day readmission rate from surgery was 1%. Mean pre- and post-operative MAP was 88.4 ± 11.4 and 90.6 ± 11.9, respectively. Mean minimum intraoperative MAP and O2saturation was 70.6 ± 9.5 and 98.7% ± 1.6%, respectively. Mean minimum intraoperative MAP was significantly decreased compared to mean pre- and post-operative MAP (P