Heart Surgery Research Articles

The Medipol Combination: Novel Rectointercostal Fascial Plane Block and Pectointercostal Fascial Plane Block for Postoperative Analgesia Management After Cardiac Surgery: A Report of 15 Cases.

The parasternal blocks cannot cover the T7 and lower anterior and lateral branches of the thoracoabdominal nerves. In the open heart surgeries, chest drainage tubes are generally outside the target of the parasternal blocks. Recently, Tulgar et al described a novel interfascial plane block technique named "recto-intercostal fascial plane block" (RIFPB). RIFPB is performed between the rectus abdominis muscle and the sixth to seventh costal cartilages. RIFPB targets the anterior and lateral cutaneous branches of the T6-T9 thoracoabdominal nerves. In this clinical report, we want to share our experiences about pectointercostal plane block and RIFPB combination (Medipol Combination) after cardiac surgery.

Anesthetic Management Recommendations Using a Machine Learning Algorithm to Reduce the Risk of Acute Kidney Injury After Cardiac Surgeries.

Open heart surgeries are a common surgical approach among patients with heart disease. Acute kidney injury (AKI) is one of the most common postoperative complications following cardiac surgeries, with an average incidence of 6 - 10%. Additionally, AKI has a mortality rate of 5 - 10%. One of the challenges of cardiac surgeries is selecting the appropriate anesthetic approaches to reduce the risk of AKI. This study presents a machine learning-based method that consists of two regression models. These models can inform the anesthesiologist about the risk of AKI resulting from the improper selection of anesthetic parameters. In this cohort study, the medical records of 998 patients who underwent cardiac surgery were collected. The proposed method includes two regression models. The first regression model recommends optimal anesthesia parameters to minimize the risk of AKI. The second model provides the anesthesiologist with the safest margin for deciding on anesthetic parameters during surgery, including cardiopulmonary bypass (CPB) time, anesthesia time, crystalloid dose, diuretic dose, and transfusion of packed red cells (PC) and fresh frozen plasma (FFP). Using this method, the specialist can evaluate the anesthetic parameters and assess the potential AKI risk. Additionally, the proposed method can also provide the treatment team with anesthetic parameters that carry the lowest risk of AKI. This method was evaluated using data from 526 patients who suffered from postoperative AKI (AKI+) and 472 who did not suffer any injury (AKI-). The accuracy of the proposed method is 80.6%. Additionally, the evaluation of the proposed method by three experienced cardiac anesthesiologists shows a high correlation between the results of the proposed method and the opinions of the anesthesiologists. The results indicated that the outputs of the proposed models and the designed software could help reduce the risk of postoperative AKI.

Robert Gross MD and the Birth of Pediatric Heart Surgery.

Robert Gross performed the first repair of a patent ductus arteriosus in 1938. His life and career were dedicated to the advancement of vascular, cardiac, pediatric surgery, and the unrelenting care of his patients.

Incidence and Outcomes of Brucella Endocarditis in a High-Prevalence Area: A Single-Center Study.

To analyze the clinical characteristics of Brucella endocarditis (BE) and observe the factors related to death to provide guidance for clinical treatment. This study examined all patients with BE admitted to The First People's Hospital of Kashi Prefecture between January 2017 and November 2023. Clinical characteristics and follow-up outcomes were collected for analysis. This study revealed 774 cases of brucellosis and 14 cases of BE, with an overall incidence rate of 1.88%. Most of the patients were male (71.43%) and lived in areas where brucellosis is common. Patients ranged in age from 26 to 68years. Common symptoms reported among patients included chest tightness and fatigue, and a significant portion also presented with congestive heart failure. Most patients exhibited normal white blood cell counts (WBC) but had elevated levels of C-reactive protein (CRP). Transthoracic ultrasound (TTE) revealed cardiac valve vegetation in all patients, along with positive blood cultures. Six patients (42.86%) completed heart surgery, and ten (71.43%) completed anti-infection treatment. Six patients died, five of whom did not undergo surgery. The other patient with Marfan syndrome died after surgery. Sex, WBC count, neutrophil (NEUT) and total bilirubin (TBIL) were significant factors associated with regression in BE patients (P < 0.05) according to univariate analysis. Patients with BE in Kashi have a severe clinical presentation at diagnosis, but early detection with improved cardiac ultrasound and aggressive treatment can improve the prognosis.

The Effect of Informing Patient Relatives with a Short Message on Anxiety Levels during Cardiovascular Surgery in Türkiye: A Randomized Controlled Trial.

Surgical procedures cause a certain level of anxiety in the relatives of the patients, it has been observed that heart surgeries cause more anxiety. To determine the effects of informing patients' relatives with short messages on anxiety levels during cardiovascular surgery. The study was conducted as a randomized controlled research investigation from October 1, 2015, to December 31, 2022, at the cardiovascular surgery operating room of a university hospital and included 84 patient relatives (42 experimental and 42 control group). The Patient Relatives Information Form and the State and Trait Anxiety Inventory were used to collect the study data. The patients' relatives in the experimental group were informed by short messages (preparations for surgery have begun, your relative's surgery has started, your relative's surgery is still ongoing, and your relative's surgery is completed) during the surgery. State Anxiety Inventory was re-administered to all patients' relatives after cardiovascular surgery. The study was registered with ClinicalTrials.gov (NCT05157789). It was found that the postoperative State Anxiety Inventory score of the experimental group was significantly lower than that of the control group (P < 0.001). The difference between preoperative and postoperative state anxiety scores was significantly higher in the experimental group (P < 0.001). Informing the patients' relatives with a short message during cardiovascular surgery significantly reduced the level of anxiety.

Psychiatric Disturbances among Patients after Heart Surgery

Psychiatric Disturbances among Patients after Heart Surgery

Pilot Assessment of Platelet Thrombus Area and Contractile Force in Pediatric Congenital Heart Surgery Patients Using a Microfluidic Device

ObjectivesEvaluate maximum platelet contractile force and thrombus area before and after cardiopulmonary bypass (CPB) in pediatric patients having congenital heart disease (CHD) surgery using a microfluidic device. DesignProspective cohort study. SettingAcademic medical center. ParticipantsTwenty pediatric CHD patients ≤ 8 years of age with expected CPB time >30 minutes. InterventionsNone Measurements and Main ResultsBlood was collected at baseline and post-CPB. Maximum platelet contractile force and thrombus area were evaluated in vitro using a microfluidic device (ATLAS PST). Post-CPB samples were supplemented with recombinant von Willebrand Factor (rVWF) to explore impact on contractile force and thrombus area. At baseline, maximum thrombus area was 0.06 [0.05, 0.07] and maximum force was 123.3 nN [68.4, 299.5]. Linear mixed effects regression models showed that maximum thrombus area was larger post-CPB and post-CPB + rVWF compared to pre-CPB (Est=0.04, p=0.002 and Est = 0.09, p < .001, respectively). Maximum thrombus area was also larger post-CPB + rVWF compared to post-CPB (Est=0.04, p=0.001). Force was higher post-CPB + rVWF compared to pre-CPB (Est=173.32, p=0.044). ConclusionsIn pediatric CHD patients, microfluidic testing demonstrated that platelet thrombus area increased slightly after CPB, while platelet contractile force did not change. In vitro addition of rVWF further increased thrombus area, suggesting augmentation of primary hemostasis. Microfluidic assessment of platelet contractile force and thrombus area in pediatric CHD patients appears feasible and can demonstrate changes after CPB. Further studies are needed to determine its accuracy and clinical utility, as well as normal values for pediatric patients.

Effective Oral Indicators With Medical and Dental Collaboration in Open Heart Surgery: A Representative Survey.

Purpose Postoperative infections pose an important problem for patients with cardiac disease. Moreover, oral health status is associated with the risk of longer hospital stays. Therefore, the oral health status of patients was assessed before open-heart surgery. This study aimed to determine the relationship between oral health status and postoperative status. Methods The study included 25 patients who underwent open-heart surgery at our university hospital in 2020. Upon admission, dentists conducted an oral examination and assessed the oral health status of the patients, also using the Japanese version of the Oral Health Assessment Tool (OHAT-J), Revised Oral Assessment Guide (ROAG), oral moisture level, oral bacteria, and other relevant factors. The study investigated the association with postoperative status. Findings Significant postoperative infections were found in patients aged ≥70 years, with an OHAT-J score of ≥5, OHAT-J lip score of ≥1, Streptococcus γ count of 1.0 × 10^6 or higher (CFU/mL), and increased Streptococcus γ before and after surgery. The duration of hospitalization correlated with the OHAT-J, OHAT-J gum and tissue, and ROAG scores. The duration of intensive care unit (ICU) stays correlated with the OHAT-J score. Conclusions The study demonstrates that OHAT-J scores are linked with predicting not just postoperative infection but also the length of hospitalization and ICU stay. As OHAT-J scores do not necessitate specialized dental instruments, they are straightforward and beneficial for healthcare professionals outside of dentistry.

Risk of Cardiac Reoperation: An Analysis of The Society of Thoracic Surgeons Congenital Heart Surgery Database

BackgroundThe increasing number of congenital heart disease patients undergoing reoperative cardiac surgery presents critical and growing challenges. Our objective was to evaluate the association between the number of prior cardiopulmonary bypass operations and operative mortality and morbidity in a national cohort. MethodsThe Society of Thoracic Surgeons Congenital Heart Surgery Database (STS-CHSD) was reviewed for index cardiac operations on cardiopulmonary bypass during 2016 to 2021. Infants and patients with functionally univentricular physiology were excluded. Multivariable logistic regression adjusted for covariates in the STS-CHSD Mortality Risk Model, the STS-European Association for Cardio-Thoracic Surgery (STAT) Mortality Category, and institutional volume. ResultsOf 50,625 eligible operations, 22,100 (44%) were performed on patients with ≥1 prior cardiopulmonary bypass operations. Most common diagnoses were tetralogy of Fallot (4340 of 22,100 [19.6%]), pulmonary atresia/ventricular septal defect (1334 of 22,100 [6.0%]), and aortic stenosis (966 of 22,100 [4.4%]). Operative mortality correlated with number of prior cardiopulmonary bypass operations: 157 of 28,525 (0.6%) for 0, 127 of 13,488 (0.9%) for 1, 81 of 5,664 (1.4%) for 2, 61 of 2039 (3.0%) for 3, 35 of 623 (5.6%) for 4, 10 of 207 (4.8%) for 5, and 5 of 79 (6.3%) for ≥6 operations (P < .001). On multivariable analysis, patients with ≥3 prior cardiopulmonary bypass operations had higher risk of operative mortality (odds ratio, 2.31; P < .001) and major morbidity (odds ratio, 1.60; P < .001). Annual institutional volume and age were not associated with either outcome. ConclusionsThree or more prior cardiopulmonary bypass operations was an independent risk factor for operative mortality/morbidity, even after controlling for risk factors and institutional volume. Future research is needed to identify modifiable factors to optimize outcomes, particularly for those with ≥3 prior cardiopulmonary bypass operations.

Reoperations in Adolescents and Adults After Prior Arterial Switch Operation: The Society of Thoracic Surgeons Congenital Heart Surgery Database Analysis

BackgroundArterial switch operation (ASO) has supplanted physiologic repairs for transposition of the great arteries and related anomalies. As survival rates have increased, so has the potential need for cardiac reoperations to address ASO-related complications arising later in life. MethodsThe Society of Thoracic Surgeons Congenital Heart Surgery Database (2010-2021) was reviewed to assess prevalence and types of cardiac reoperations for patients aged ≥10 years with prior ASO for transposition of the great arteries or double-outlet right ventricle/transposition of the great arteries type. A hierarchical stratification designating 13 procedure categories was established a priori by investigators. Each eligible surgical hospitalization was assigned to the single highest applicable hierarchical category. Outcomes were compared across procedure categories, excluding hospitalizations limited to pacemaker-only and mechanical circulatory support–only procedures. Variation during the study period in relative proportions of left heart vs non–left heart procedure category encounters was assessed. ResultsThere were 698 cardiac surgical hospitalizations for patients aged 10 to 35 years at 100 centers. The most common left heart procedure categories were aortic valve procedures (n = 146), aortic root procedures (n = 117), and coronary artery procedures (n = 40). Of 619 hospitalizations eligible for outcomes analysis, major complications occurred in 11% (67/619). Discharge mortality was 2.3% (14/619). Year-by-year analysis of surgical hospitalizations reveals substantial growth in numbers for the aggregate of all procedure categories. Growth in relative proportions of left heart vs non–left heart procedures was significant (P = .0029; Cochran-Armitage trend test). ConclusionsThis large multicenter study of post-ASO reoperations beyond early childhood documents year-over-year growth in total reoperations. Left-sided heart procedures recently had the highest rate of rise. These observations have implications for counseling, surveillance, and management.

“Electrical impedance tomography during open heart surgery and on the cardiac icu is feasible to monitor ventilation in children with congenital heart disease”

Alveolar de recruitment is a common problem during general anesthesia and operations. Pediatric cardiac surgery with cardiopulmonary Bypass is associated with interruption of ventilation and might enhance loss of Ventilation compared to other surgical procedures. Electrical impedance tomography (EIT) allows for monitoring of ventilation distribution and can be helpful in detecting pulmonary de recruitment. This case series demonstrates for the first time that EIT is feasible during open heart surgery and in patients with open chest on the ICU using adapted belts in pediatric patients. It might be helpful to monitor changes in tidal volume distribution, to detect loss of Ventilation during surgery and to guide recruitment maneuvers. Study registration: NCT06270485, clincialtrials.gov, 02/02/2024.

Simple Trans Sternal Closure of the sternum Versus Figure of Eight Closure of The Sternum in Open Heart Surgery

Simple Trans Sternal Closure of the sternum Versus Figure of Eight Closure of The Sternum in Open Heart Surgery

Early postoperative complications in open heart surgery patients: A review

Over the past few decades, open heart surgery has undergone significant progress in terms of technologies used, operative techniques and resuscitation care. This has led to a significant increase in patient survival and quality of life after discharge. However, there are still a number of challenges to be addressed, one of which is reducing the incidence of early postoperative complications. They are directly and primarily determined by patients’ demographic and clinical characteristics, as well as by the characteristics of the surgical intervention itself and are a major factor in the outcome of the surgery performed. This review presents the most important and frequent early complications, their epidemiological and clinical features. Their good knowledge is the key to achieving an optimal treatment approach and seeking effective opportunities for their prediction and incidence reduction.

Venous Congestion Assessed by Venous Excess Ultrasound (VExUS) and Acute Kidney Injury in Children with Right Ventricular Dysfunction.

Right ventricular dysfunction (RVD) is a complication following congenital cardiac surgery in children and can lead to systemic venous congestion, low cardiac output, and organ dysfunction. Venous congestion can be transmitted backwards and adversely affect encapsulated organs such as the kidneys. To investigate the association between systemic venous congestion, as estimated by Venous Excess Ultrasound (VExUS), and the occurrence of acute kidney injury (AKI) in children with RVD following congenital heart surgery. Secondary objectives included comparing changes in VExUS scores after initiating treatment for RVD and venous congestion. This was a prospective observational study in children with RVD. The VExUS study was performed on day 1, day 2, and day 3 and categorized as VExUS-1, VExUS-2, and VExUS-3. Among 43 patients with RVD and dilated inferior vena cava, 19/43 (44%), 10/43 (23%), and 12/43 (28%) were VExUS-2 and VExUS-3, respectively. There was an association between severe RVD and elevated pulmonary artery systolic pressures and a VExUS score >2. A significant association was observed between central venous pressure (CVP) measurements and VExUS. Among 31 patients with a high VExUS score >2, 18 (58%) had AKI. Additionally, improvement in CVP and fluid balance was associated with improving VExUS scores following targeted treatment for RVD. VExUS serves as a valuable bedside tool for diagnosing and grading venous congestion through ultrasound Doppler. An elevated VExUS score was associated with the occurrence of AKI, and among the components of VExUS, portal vein pulsatility may be useful as a predictor of AKI. Natraj R, Bhaskaran AK, Rola P, Haycock K, Siuba MTT, Ranjit S. Venous Congestion Assessed by Venous Excess Ultrasound (VExUS) and Acute Kidney Injury in Children with Right Ventricular Dysfunction. Indian J Crit Care Med 2024;28(5):447-452.

Risk Factors for Postoperative Chylothorax Occurrence Following Pediatric Congenital Heart Surgery

Objectives: Chylothorax, a rare but potentially life-threatening complication post congenital heart surgery, warrants early identification of risk factors to implement preventive strategies and timely interventions. This study aims to determine risk factors associated with chylothorax occurrence at our cardiac intensive care unit. Methods: We conducted a nested case-control study involving 2042 children who underwent congenital heart surgery at Nhi Dong 1 hospital (Ho Chi Minh City, Vietnam) from Feb 25th, 2015, to October 12th, 2019. Among these, 38 chylothorax cases were matched by sex and year of surgery to 76 randomly selected control patients. Univariate analysis and logistic regression were performed to identify independent factors associated with chylothorax occurrence after congenital heart surgery. Results: Neonatal cardiac surgery, RACHS-1 risk category ≥ 3, aortic arch repair, the arterial switch operation, prolonged bypass time (median 160 mins vs 87 mins) and aortic clamp time (median 89.5mins vs 51 mins), delayed sternal closure and unexpected reoperation were all associated with postoperative chylothorax occurrence on univariate analysis. Additionally, body weight &lt; 4.5 kg (p=0.027), postoperative dysrhythmias (p=0.004), and high volume of chest tube output (&gt; 10% of total expected blood volume) within the first 6 postoperative hours after cardiac intensive care unit admission (p=0.014) emerged as independent risk factors for postoperative chylothorax occurrence with odds ratios and 95% confident interval of 2.78 (1.12-6.87), 3.38 (1.29-8.86) &amp; 3.82 (1.55-9.39), respectively. These factors served as predictors of postoperative chylothorax occurrence with a sensitivity of 42.1%, specificity of 90.8%, positive predictive value of 69.6% and a negative predictive value of 75.8%. Conclusions: High chest tube output within the first 6 postoperative hours, postoperative dysrhythmias, and body weight of &lt; 4.5kg at surgery significantly increase the risk of postoperative chylothorax in our institution. Keywords: Postoperative chylothorax, chylothorax post pediatric cardiac surgery, pediatric chylothorax

Vancomycin Dosing and Its Association With Acute Kidney Injury in Pediatric Cardiac Intensive Care Patients Under 3 Months of Age.

The standard vancomycin regimen for term neonates is 45 mg/kg/day. However, the optimal starting vancomycin dosing for achieving therapeutic levels in young infants in cardiac intensive care units remains unknown. Moreover, data on the association of supratherapeutic vancomycin levels with acute kidney injury (AKI) are limited. Retrospective study of infants ≤3 months old, receiving vancomycin following congenital heart surgery at postoperative intensive care unit admission. Assessed were vancomycin dosing, achievement of therapeutic trough concentration of 10-20 mg/L and development of AKI, based on the modified Kidney Disease Improving Global Outcomes criteria. Inclusion criteria were met by 109 patients with a median age of 8 days (IQR: 6-16). The mean (SD) vancomycin dose required for achieving therapeutic concentration was 28.9 (9.1) mg/kg at the first postoperative day. Multivariate logistic regression identified higher preoperative creatinine levels and shorter cardiopulmonary bypass time as predictors of supratherapeutic vancomycin concentrations (c-index 0.788). During the treatment course, 62 (56.9%) developed AKI. Length of stay and mortality were higher in those who developed AKI as compared with those who did not. Multivariate logistic regression identified higher vancomycin concentration as a predictor for postoperative AKI, OR, 3.391 (95% CI: 1.257-9.151), P = 0.016 (c-index 0.896). Our results support a lower starting vancomycin dose of ~30 mg/kg/day followed by an early personalized therapeutic approach, to achieve therapeutic trough concentrations of 10-20 mg/L in cardiac postoperative term infants. Supratherapeutic concentrations are associated with an increased risk for AKI, which is prevalent in this population and associated with adverse outcomes.

Efek Steroid Terhadap Kadar Troponin I dan CRP Pada Pasien Bedah Jantung Koroner di RSUD Arifin Achmad Provinsi Riau

Steroids can diminish inflammation and forestall cardiac impairment in cardiac surgery cases, encompassing coronary heart surgery; however, this approach remains a topic of ongoing discussion. The present study investigated the ramifications of administering steroids in coronary heart surgery patients, focusing on the variations in CRP and Troponin I level at Arifin Achmad General Hospital in Riau Province. Employing a cross-sectional design, the study retrospectively reviewed medical records of individuals who had undergone coronary heart surgery between January 2018 and September 2020 at Arifin Achmad Hospital in Riau Province. Comparisons between Troponin I and C-Reactive Protein (CRP) levels were drawn contingent on the specific administered steroid (methylprednisolone or dexamethasone). The study further examined secondary outcomes, encompassing myocardial contractility, duration of ventilator employment, and Intensive Care Unit (ICU) length of stay, distinguishing patterns based on the steroid type. Among the 42 analyzed patients, the methylprednisolone and dexamethasone groups exhibited significant increases in troponin I and CRP levels (p&lt;0.05). In contrast, changes in myocardial contractility pre- and post-surgery remained consistent across both groups—similarly, no substantial difference in ventilator or ICU stay duration. As the conclusion, dexamethasone and methylprednisolone have not given any effect in preventing increases in troponin I, CRP levels and myocardial contractility early after coronary heart surgery.

Modifiable risk factors of immediate and long-term outcomes in the operable and inoperable with left-sided infective endocarditis

ObjectivesTo evaluate the outcomes of left-sided infective endocarditis that can be operated on and cannot be operated on, and to focus on modifiable risk factors for immediate and long-term mortality. MethodsThis study retrospectively investigated patients with left-sided infective endocarditis who occurred in our medical center between January 2006 and November 2022. Results48 in-hospital deaths occurred (5.8 %, 48/832). We identified time from symptoms to admission and symptomatic neurological complications to be risk factors for multiple organ failure upon admission. Time from symptoms to admission and vegetation size in group of isolated medical treatment were significantly shorter than those in the group of heart operation. We also found that preoperative neurological complications, annulus destruction, levels of serum creatinine at 24 and 48 h post heart operation, and perivalvular leakage are risk factors for in-hospital mortality post heart operation. With 148 μmol/L as a cutoff level, the diagnostic sensitivity and specificity of serum creatinine level 48 h post surgery for in-hospital mortality post cardiac surgery are 100 % and 81.6 %, respectively. We found that vegetation size, ICU stay, postoperative serum creatinine at 48 h, left ventricular end diastolic size postoperative, and red blood cell transfusion were associated with all-time mortality. ConclusionsEarly diagnosis and treatment, improvement of surgical techniques, good protection for heart, kidney and blood and close follow-up are advocated to conduce to better immediate and long-term outcomes of the operable and inoperable with left-sided infective endocarditis.

The Burden of Stroke in Neonates Undergoing Congenital Heart Surgery: A Large Multicenter Analysis

BackgroundStroke affects surgical decision making and outcomes of neonatal cardiac surgery (CHS). We sought to assess the burden of stroke in this population from a large multicenter database. MethodsWe analyzed neonates undergoing CHS with cardiopulmonary bypass from the Pediatric Health Information System database (2004-2022). The cohort was divided into the stroke group, which included preoperative/postoperative ischemic, hemorrhagic subtypes, and grade III to IV intraventricular hemorrhages, and compared in-hospital and follow-up outcomes to a nonstroke group. ResultsA perioperative stroke occurred in 800 of 14,228 neonates (5.6%). The stroke group was more likely to have hypoplastic left heart syndrome (HLHS; 30.5% vs 20.7%), born preterm (19.4% vs 11.7%), low birth weight (17.8% vs 11.9%), and require extracorporeal membrane oxygenation (ECMO; 48.8% vs 13.8%; all P < .001). Outcomes comparing stroke vs no stroke were mortality, 33.1% vs 8.9%; nonhome discharge, 12.5% vs 6.9%; length of stay, 41 vs 24 days; and hospitalization costs, $354,521 vs $180,489 (all, P < .05). Stroke increased the odds of mortality by 2-fold (odds ratio, 2.20; 95% CI, 1.75-2.77; P < .001) after adjusting for ECMO, prematurity among other significant factors. On follow-up, the stroke group had a higher incidence of hydrocephalus (9.5% vs 1.3%), cerebral palsy (6.2% vs 1.3%), and autism spectrum disorder (7.1% vs 3.5%), and survivors of the index admission had higher 1- and 5-year mortality (5.3% and 11.3% vs 3.3% and 5.9%, respectively; all P < .05). ConclusionsNeonatal CHS patients born prematurely, diagnosed with HLHS, or those requiring ECMO are disproportionately affected by stroke. The occurrence of stroke is marked by significantly higher mortality. Future research should seek to identify factors leading to stroke to increase rescue after stroke and for improvement of long-term outcomes.

The Hemodynamic Changes Induced by Lung Recruitment Maneuver to Predict Fluid Responsiveness in Children during One Lung Ventilation-A Prospective Observational Study.

The prediction of fluid responsiveness in critical patients helps clinicians in decision making to avoid either under- or overloading of fluid. This study was designed to determine whether lung recruitment maneuver (LRM) would have an effect on the predictability of fluid responsiveness by the changes of hemodynamic parameters in pediatric patients who were receiving lung-protective ventilation and one-lung ventilation (OLV). A total of 34 children, aged 1-6 years old, scheduled for heart surgeries via right thoracotomy were enrolled. Patients were anesthetized and OLV with lung-protection ventilation settings was established, and then, positioned on left lateral decubitus. LRM and volume expansion (VE) were performed in sequence. Heart rate (HR), systolic arterial pressure (SAP), mean arterial pressure (MAP) diastolic arterial pressure (DAP), stroke volume (SV), stroke volume variation (SVV), and pulse pressure variation (PPV) were recorded via an A-line based monitor system at the following time points: before and after LRM (T1 and T2) and before and after VE (T3 and T4). An increase in stroke volume (SV) or mean arterial pressure (MAP) of ≥10% following fluid loading identified fluid responders. The predictability of fluid responsiveness by the changes of SV (ΔSVLRM) and MAP (ΔMAPLRM) after LRM and VE were statistically evaluated by receiver operating characteristic curves [area under the curves (AUC)]. SVs in all patients were significantly decreased after LRM (p < 0.01) and then, increased and returned to baseline after VE (p < 0.01). In total, 16 out of 34 patients who were fluid responders had significantly lower SV after LRM compared to that in fluid non-responders. The area under the receiver operating characteristic curves for ΔSVLRM was 0.828 (95% confidence interval [CI], 0.660 to 0.935; p < 0.001) and it indicated that ΔSVLRM was able to predict the fluid responsiveness of pediatric patients. MAPs in all patients were also decreased significantly after LRM, and 12 of them fell into the category of fluid responders after VE. Statistically, ΔMAPLRM did not predict fluid responsiveness when LRM was considered as an influential factor (p = 0.07). ΔSVLRM, but not ΔMAPLRM, showed great reliability in the prediction of the fluid responsiveness following VE in children during one-lung ventilation with lung-protective settings. ChiCTR2300070690.