Late outflow graft stenosis of left ventricular assist device and endovascular treatment.

Left ventricular assist device (LVAD) systems are preferred as a bridging to transplantation or as a destination therapy in the treatment of end-stage heart failure. LVAD-related complications are seen in different clinical variations with the widespread use of LVADs. Some of these complications are seen as related to outflow graft, such as graft stenosis, graft kinking and graft thrombosis. Outflow graft complications have a direct impact on LVAD flow rate and acutely impair the clinical condition of patients. Treatment modalities include surgical approach, endovascular approach, and medical approach. In this case report, we aim to share a 57-year-old male patient, who had outflow graft stenosis near the anastomosis line between ascending aorta and the left ventricular assist device outflow graft, and the endovascular treatment.

Exercise capacity following ventricular assist device implantation via thoracotomy with outflow cannula anastomosis to the descending aorta.

Left ventricular assist device (LVAD) implantation via left lateral thoracotomy with outflow cannula anastomosis to the descending aorta is an alternative technique that avoids anterior mediastinal planes and requires a single incision. This study compares changes in exercise capacity following LVAD implantation with outflow cannula anastomosis to the descending aorta versus ascending aorta. Adult patients who received a continuous flow centrifugal LVAD implantation and completed both pre- and postimplantation cardiopulmonary exercise tests (CPETs) and or 6-minute walk tests (6MWT) were included. Change in CPET parameters (maximum oxygen intake: vO2 max, oxygen uptake efficiency ratio: OUES, ventilatory efficiency ratio: vE/vCO2 Slope) and 6MWT distance were compared between ascending and descending aorta anastomosis groups. Ascending and descending aorta anastomosis cohorts included 59 and 14 patients, respectively. Pre- and postimplantation CPETs were performed 63 ± 12 days before and 216 ± 17 days following implantation. The improvement in CPET parameters (vO2 max, OUES, vE/vCO2 Slope) or 6MWT distance was not significantly different between the ascending and descending aorta anastomosis groups. This study found no significant difference in the improvement of CPET parameters or 6MWT distance between LVAD implantation via thoracotomy with outflow cannula anastomosis to descending aorta and standard implantation via sternotomy with outflow cannula anastomosis to ascending aorta.

Association between caregivers' coping and children's psychiatric symptoms in the heart transplantation process: A pilot study.

Our aim was to investigate whether there is an association between caregivers' coping and children's psychiatric symptoms and quality of life in adolescent heart transplant (HTx) recipients and HTx candidates with left ventricular assist device (LVAD). Fourteen patients were recruited for this pilot study (HTx (n = 8), LVAD (n = 6)). Schedule for Affective Disorders and Schizophrenia for School Aged Children, Present and Lifetime Version (K-SADS) was administered to detect the psychiatric diagnosis of patients. Children's Depression Inventory (CDI), State-Trait Anxiety Inventory, and Pediatric Quality of Life Inventory (PedsQL) were completed by adolescents; Brief Coping Styles Inventory by their caregivers. Six of the participants had an internalizing disorder. Optimistic coping strategy score was significantly higher in the caregivers of adolescents without an internalizing disorder than caregivers of those with an internalizing disorder (U = 2.500, P = .005). Utilizing Spearman's correlation, caregivers' optimistic approach (rho = -0.736, P = .004), and self-confident approach (rho = -0.634, P = .020) had significant negative correlations with children's CDI scores. Moreover, caregivers' optimistic approach score had a significant positive correlation with children's PedsQL score (rho = 0.563, P = .045). According to our preliminary results, it seems that caregivers' optimistic and self-confident coping strategies may be associated with fewer internalizing symptoms and a better quality of life in adolescents in the HTx process. A future multicentered longitudinal study will be planned to assess the effect of caregivers' coping strategies on the psychological adjustment of these children.

Impact of Residual Mitral Regurgitation on Right Ventricular Systolic Function After Left Ventricular Assist Device Implantation.

Significant mitral regurgitation (MR) is thought to decrease after left ventricular assist device (LVAD) implantation, and therefore repair of mitral valve is not indicated in current practice. However, residual moderate and severe MR leads to pulmonary artery pressure increase, thereby resulting in right ventricular (RV) dysfunction during follow-up. We examined the impact of residual MR on systolic function of the right ventricle by echocardiography after LVAD implantation. This study included 90 patients (mean age: 51.7 ± 10.9 years, 14.4% female) who underwent LVAD implantation (HeartMate II = 21, HeartWare = 69) in a single center between December 2010 and June 2014. Echocardiograms obtained at 3-6 months and over after implantation were analyzed retrospectively. RV systolic function was graded as normal, mild, moderate, and severely depressed. MR (≥moderate) was observed in 43 and 44% of patients at early and late period, respectively. Systolic function of the RV was severely depressed in 16 and 9% of all patients. Initial analysis (mean duration of support 174.3 ± 42.5 days) showed a statistically significant correlation between less MR and improved systolic function of RV (P = 0.01). Secondary echocardiographic analysis (following a mean duration of support of 435.1 ± 203 days) was also statistically significant for MR degree and RV systolic dysfunction (P = 0.008). Residual MR after LVAD implantation may cause deterioration of RV systolic function and cause right-sided heart failure symptoms. Repair of severe MR, in selected patients such as those with severe pulmonary hypertension and depressed RV, may be considered to improve the patient's clinical course during pump support.

Assessment of right ventricular systolic function in heart transplant patients: Correlation between echocardiography and cardiac magnetic resonance imaging. Investigation of the accuracy and reliability of echocardiography.

BACKGROUND: Right ventricular (RV) function has great impact on the survival of heart transplantation recipients; therefore, careful evaluation is of high clinical importance. However, there is no standard conventional echocardiographic parameter to assess RV systolic function. Herein, we evaluated the correlation between echocardiographic parameters of RV systolic function and ejection fraction assessed by cardiac magnetic resonance imaging (MRI RVEF) in heart transplantation recipients. METHOD AND RESULTS: Forty-three patients with at least 6-month heart transplantation history were included in this study. Each patient had conventional echocardiography and cardiac MRI evaluation, followed by endomyocardial biopsy and right heart catheterization, which were performed in six hours. Echocardiographic parameters of RV systolic function, RV fractional area change (RV FAC), tricuspid annular plane systolic excursion (TAPSE), RV myocardial performance index, and RV global longitudinal strain, were compared with MRI RVEF (P values were <0.001, <0.3, <0.9, and <0.4, respectively). RV FAC was the only parameter to strongly correlate with MRI RVEF (r=0.747, P<0.001); and RV FAC 48.5% value had 90.5% sensitivity and 90.5% specificity to predict the pathologic reference value of MRI RVEF ≤50% (AUC:0.96; 95% CI, 0.908-1.013). CONCLUSION: To our knowledge, this is the first prospective study to evaluate the correlation between the echocardiographic parameters for RV systolic function and MRI RVEF in heart transplantation recipients. RV FAC is the only parameter to correlate well with MRI RVEF, and its routine use in the follow-up of heart transplantation recipients should be considered.

Building 3D anatomical model of coiling of the internal carotid artery derived from CT angiographic data.

The purpose of this study is to recreate live patient arterial anomalies using new recent application of three-dimensional (3D) printed anatomical models. Another purpose of building such models is to evaluate the effectiveness of angiographic data. With the help of the DICOM files from computed tomographic angiography (CT-A), we were able to build a printed model of variant course of the internal carotid artery (ICA). Images of coiling of the ICA taken by CT-A, were then converted into 3D images using Google SketchUp free software, and the images were saved in stereolithography format. Imaging helped us conduct the examination in details with reference to geometrical features of ICA, degree of curve, its extension, location and presence of loop. Challenging vascular anatomy was exposed with models of adverse curve of carotid anatomy, including highly angulated necks, conical necks, short necks, tortuous carotid arteries, and narrowed carotid lumens. It assisted us to comprehend spatial anatomy configuration of life-like models. 3D model can be very effective in cases when anatomical difficulties are detected through the CT-A, and therefore, a tactile approach is demanded preoperatively. 3D life-like models serve as an essential office-based tool in vascular surgery as they assist surgeons in preoperative planning, develop intraoperative guidance, teach both the patients and the surgical trainees, and simulate to show patient-specific procedures in medical field.

Left Ventricular Aneurysm Repair with Endoaneurysmorrhaphy Technique: An Assessment of Two Different Ventriculotomy Closure Methods.

BACKGROUND: Left ventricular aneurysm is a serious mechanical complication of myocardial infarction and has an incidence of 10-35% after myocardial infarction. Ventricular aneurysm in patients with angina, heart failure, and ventricular arrhythmia should be surgically treated. Endoaneurysmorrhaphy is one of the repair techniques that results in better left ventricular geometry and function. After this surgical procedure the ventriculotomy is repaired either with Teflon felt strips or by direct suture of the epicardium. METHODS: In this study, we described the postoperative early outcomes of two ventriculotomy closing techniques such as Teflon felt versus direct closure after aneurysm repair. This retrospective study included a total of 73 patients (mean age > 70 years) with left ventricular aneurysm, who underwent endoaneurysmorrhaphy repair between 1997 and 2009. All selected patients were divided into two groups according to the ventriculotomy closure technique either by Teflon felt or direct by epicardial closure. The pre-, intra-, and postoperative results of these patients were analyzed accordingly. RESULTS: The postoperative early mortality rate and postoperative bleeding were not significantly different between the Teflon felt and primary closure groups (P = .246 and P = .371 respectively), but postoperative arrhythmias were significantly higher in the Teflon felt repair group (P = .049). CONCLUSION: Endoaneurysmorrhaphy is a better surgical technique in left ventricle aneurysm to restore the internal contour and preserve the surface anatomy of the ventricle. The ventriculotomy closure can be performed with two different approaches, including Teflon felt strips or by direct suture of the epicardium. Based on this study's findings, two repair techniques have similar impact on the early outcomes. However, with overall outcomes with respect to Teflon felt repair, direct closure of the ventriculotomy after endoaneurysmorrhaphy was superior.

New era of pediatric ventricular assist devices: let us go to school.

As there is still a shortage of pediatric donor hearts, several techniques have been used to assist pediatric patients to survive until transplantation. VADs provide long-term support and ability of mobilization for children before a suitable heart becomes available. Several devices such as paracorporeal pumps have been used for this purpose, with acceptable morbidity and mortality rates. However, discharge is not possible, as there is no mobile drive unit for these small-sized pumps. The possible negative psychosocial impact of long-term hospitalization, away from home and school, may cause some adjustment problems in the future. In this case series, three pediatric patients that underwent intracorporeal LVAD implantation and returned to school are presented to share clinical experience and also to attract attention to the potential social and psychiatric implications.

[Heart transplantation: preoperative evaluation, perioperative management, postoperative follow-up]. / Kalp transplantasyonu: Ameliyat öncesi degerlendirme, ameliyat sürecinde bakim ve sonrasinda izleme.

Heart transplantation has, over the years, become the best treatment choice for patients with end-stage heart failure. The increase in longer waiting times among patients awaiting transplantation is due to scarcity of suitable donor organs. Major improvements in recipient and donor selection, perioperative management and postoperative follow-up such as immunosuppressive treatment and prevention of opportunistic infections have considerably enhanced the outcome of heart transplantation. This review will focus on the managements of these complex patients, as well as on some proposed changes to achieve better results.

[Current status of heart transplantation in Turkey]. / Türkiye'de kalp transplantasyonunun güncel durumu.

Heart failure is a clinical picture that occurs when the heart is unable to provide sufficient blood to the tissues and organs due to low performance. In end-stage heart failure, quality of life and survival rates are affected adversely. Heart transplantation is still the best method of treatment in many end-stage heart failure patients who remain symptomatic despite guideline-directed medical therapy. The current situation of heart transplantation in Turkey is discussed in this review.

The Role of Artificial Intelligence and Machine Learning in the Prediction of Right Heart Failure after Left Ventricular Assist Device Implantation: A Comprehensive Review.

One of the most challenging and prevalent side effects of LVAD implantation is that of right heart failure (RHF) that may develop afterwards. The purpose of this study is to review and highlight recent advances in the uses of AI in evaluating RHF after LVAD implantation. The available literature was scanned using certain key words (artificial intelligence, machine learning, left ventricular assist device, prediction of right heart failure after LVAD) was scanned within Pubmed, Web of Science, and Google Scholar databases. Conventional risk scoring systems were also summarized, with their pros and cons being included in the results section of this study in order to provide a useful contrast with AI-based models. There are certain interesting and innovative ML approaches towards RHF prediction among the studies reviewed as well as more straightforward approaches that identified certain important predictive clinical parameters. Despite their accomplishments, the resulting AUC scores were far from ideal for these methods to be considered fully sufficient. The reasons for this include the low number of studies, standardized data availability, and lack of prospective studies. Another topic briefly discussed in this study is that relating to the ethical and legal considerations of using AI-based systems in healthcare. In the end, we believe that it would be beneficial for clinicians to not ignore these developments despite the current research indicating more time is needed for AI-based prediction models to achieve a better performance.

Impact of the empirical therapy timing on the clinical progress of septic shock patients.

AIM: To evaluate the effect of timing of antimicrobial therapy on clinical progress of patients with septic shock. MATERIALS AND METHOD: We included 204 adult patients diagnosed with septic shock according to Sepsis-3 criteria between March 2016 and April 2021. One-month survival was evaluated using univariate and logistic regression analysis. RESULTS: Antibiotic treatment was initiated within 1 h of the vasopressors in 26.4 % of patients. One-month mortality did not differ significantly between patients with and without empirical therapy coverage on etiological agents. Univariate factors that significantly affected one-month survival were starting antibiotics at the first hour, the unit where the case was diagnosed with septic shock, SOFA scores, qSOFA scores, and lactate level. In multivariate analysis, diagnosis of septic shock in the Emergency Service, SOFA score ≥11, qSOFA score of three and lactate level ≥4 were significantly associated with one-month mortality. CONCLUSION: Training programs should be designed to increase the awareness of septic shock diagnosis and treatment in the Emergency Service and other hospital units. Additionally, electronic patient files should have warning systems for earlier diagnosis and consultation.

Fundus fluorescein angiographic findings in patients who underwent ventricular assist device implantation.

Disruption of microcirculation in various tissues as a result of deformed blood rheology due to ventricular assist device (VAD) implantation causes novel arteriovenous malformations. Capillary disturbances and related vascular leakage in the retina and choroidea may also be seen in patients supported by VADs. We aimed to evaluate retinal vasculature deteriorations after VAD implantation. The charts of 17 patients who underwent VAD implantation surgery for the treatment of end-stage heart failure were retrospectively reviewed. Eight cases (47.1%) underwent pulsatile pump implantation (Berlin Heart EXCOR, Berlin Heart Mediprodukt GmbH, Berlin, Germany); however, nine cases (52.9%) had continuous-flow pump using centrifugal design (HeartWare, HeartWare Inc., Miramar, FL, USA). Study participants were selected among the patients who had survived with a VAD for at least 6 months, and results of detailed ophthalmologic examinations including optic coherence tomography (OCT) and fundus fluorescein angiography (FA) were documented. All of the 17 patients were male, with a mean age of 48.5 ± 14.8 years (15-67 years). Detailed ophthalmologic examinations including the evaluation of retinal vascular deteriorations via FA were performed at a mean of 11.8 ± 3.7 months of follow-up (6-18 months). Mean best-corrected visual acuity and intraocular pressure were found as logMAR 0.02 ± 0.08 and 14.6 ± 1.9 mm Hg, respectively in the study population. Dilated fundoscopy revealed severe focal arteriolar narrowing in two patients (11.8%), and arteriovenous crossing changes in four patients (23.5%); however, no pathological alteration was present in macular OCT scans. In patients with continuous-flow blood pumps, mean arm-retina circulation time (ARCT) and arteriovenous transit time (AVTT) were found to be 16.8 ± 3.0 and 12.4 ± 6.2 s, respectively; whereas those with pulsatile-flow blood pumps were found to be 17.4 ± 3.6 and 14.0 ± 2.1 s in patients (P=0.526 and P=0.356, respectively). FA also revealed a tendency for increased frequency of dye leakage from the optic disc in our study population. Except for remarkable delays in both ARCT and AVTT as well as a tendency for increased frequency of dye leakage from the optic disc, ophthalmologic evaluations revealed no other significant pathology or vascular deterioration in the retina that could be attributed to artificial heart systems.

Comparison of continuous-flow and pulsatile-flow blood pumps on reducing pulmonary artery pressure in patients with fixed pulmonary hypertension.

Pulmonary hypertension (PH) is considered as a risk factor for morbidity and mortality in patients undergoing heart transplantation. Recently, left ventricular assist device (LVAD) implantation has been increasingly used in reducing pulmonary artery pressure (PAP) in patients with PH unresponsive to medical therapy. Herein, we aimed to compare the efficacy of continuous-flow and pulsatile-flow blood pumps on the improvement of PH in mechanical circulatory support patients. Twenty-seven patients with end-stage heart failure who underwent LVAD implantation surgery were enrolled. Fifteen of them (55.6%) had continuous-flow pump (HeartWare Ventricular Assist System, HeartWare, Inc., Miramar, FL, USA), and 12 of them (44.4%) had pulsatile pump (Berlin Heart EXCOR ventricular assist device, Berlin Heart AG, Berlin, Germany). The efficacy of LVADs on the improvement of PH was compared between continuous-flow and pulsatile pumps by the evaluation of systolic PAP, tricuspid annular plane systolic excursion (TAPSE), right ventricular systolic motion (RVSM), right ventricular ejection fraction (RVEF), and grade of tricuspid insufficiency (TI) for each of the study participants. All of the 15 patients who underwent continuous-flow blood pump implantation surgery (Group 1) were male with a mean age of 46.9 ± 11.7 years, and in pulsatile-flow blood pump implanted participants (Group 2), the mean age was 40.6 ± 16.8 years, all of whom were also male (P=0.259). Mean follow-up was 313.7 ± 241.3 days in Group 1 and 448.7 ± 120.7 days in Group 2 (P=0.139). In Group 1, mean preoperative and postoperative systolic PAP were measured as 51.7 ± 12.2 mm Hg and 22.2 ± 3.4 mm Hg, respectively, while those in Group 2 were 54.5 ± 7.5 mm Hg and 33.9 ± 6.4 mm Hg, respectively. A significantly greater decrease in systolic PAP was noticed in patients with continuous-flow blood pumps (P=0.023); however, no statistically significant difference was found when we considered the change in TAPSE between study groups (P=0.112). A statistical significance in the alteration of RVEF, RVSM, and the grade of TI during study visits was not found between the study groups (P=0.472, P=0.887, and P=0.237, respectively). Although the two studied types of LVADs were found to be effective in reducing PAP in heart transplantation candidates with PH, lesser postoperative systolic PAP values were achieved in patients who underwent continuous-flow pump implantation surgery.

Association of Nutritional Risk Index With Continuous Flow Left Ventricular Assist Device Complications.

BACKGROUND: Studies revealing the relationship between major surgery outcomes and nutritional parameters are increasing daily. Publications demonstrating the relationship between early postoperative success and surgical complications in patients with chronic heart failure and continuous flow left ventricular assist device (cf-LVAD) are limited. The vast majority of patients with advanced chronic heart failure are cachexic, and the reason for this is multifactorial. The aim of this study is to investigate the link between the modified nutritional risk index (NRI) and 6-month survival and complication rates in patients with a cf-LVAD. METHODS: This study included statistical analysis of NRI and postoperative parameters of 456 patients with advanced heart failure who had cf-LVAD implantation between 2010 and 2020. RESULTS: The results of this study showed a statistically significant difference between mean NRI values and postoperative parameters such as 6-month survival (P = .001), right ventricular failure (P = .003), infection (P = .001), driveline infection (P = .000), and sepsis (P = .000). CONCLUSIONS: This study revealed that 6-month postoperative complications and mortality rates of patients with advanced heart failure in patients with cf-LVAD are closely related to malnutrition status. In these patients, nutrition specialist use would be beneficial both preoperatively and postoperatively to increase surveillance and reduce postoperative complications.

Our Single Center Experiences with Left Ventricular Assist Device Exchange.

BACKGROUND: Mechanical circulatory support technology continues to evolve to satisfy the needs of advanced heart failure patients. Despite improvements, various problems occur frequently, and surgical exchange of the pump can be a feasible treatment option. Optimal patient selection is key to success in exchange operations. METHODS: Using a retrospective observational cohort design, this study aims to evaluate preoperative profiles and clinical courses of patients' undergoing a device exchange operation and identified possible contributors to in-hospital mortality. Currently, 155 left ventricular assist device (LVAD) patients are being followed up in our program. In total, 15 of 155 patients underwent a pump exchange operation. Baseline characteristics, clinical features, and laboratory results were evaluated. The primary outcome was all-cause in-hospital mortality. RESULTS: Of the 15 patients who underwent a pump exchange operation, thrombosis was the primary cause in 12. Five patients experienced in-hospital mortality within 30 days of LVAD exchange. The international normalized ratio (INR) was higher in patients who experienced in-hospital mortality (2.4 [±0.6] vs 1.2 [±0.4], P = .005) than in patients who survived to discharge. In addition, preoperative lactate levels were significantly higher in patients who died within 30 days (2.9 [±2.6] vs 0.9 [±0.4], P = .019). CONCLUSIONS: Higher INR and lactate levels could possibly contribute to in-hospital mortality, which underlines the importance of right ventricular function in this patient population. Careful evaluation of the right heart function is of great importance before exchange operations, and preoperative hemodynamic stability is crucial for better postoperative outcomes.

Retrospective Evaluation of COVID-19 Infection and COVID-19 Vaccines in Heart Transplant Patients.

BACKGROUND: Patients who have performed solid organ transplantation in terms of COVID-19 infection are included in the high-risk group. In this study, it was aimed to evaluate the relationship between vaccination and retrospective evaluation of 32 patients who underwent a heart transplant in the clinic and tested positive for SARS-CoV-2 polymerase chain reaction. METHODS: In this study, demographic characteristics of the cases, comorbidities, timing of heart transplantation, immunosuppressive treatments, symptoms of COVID-19 infection, lung imaging findings, follow-up (outpatient/inpatient), treatments, 1-month mortality, and vaccination histories against COVID-19 infection were evaluated. The data obtained from the study were analyzed with SPSS version 25.0. RESULTS: The 3 most common symptoms are cough (37.5%), myalgia (28.1%), and fever (21.8%). COVID-19 infection was severe in 6.2% of the patients, moderate in 37.5%, and mild in 56.2%. Hospitalization was required in 5 patients (15.6%, 1 in the intensive care unit), and the other patients were followed up as an outpatient. Severe COVID-19 infection was seen more in 33% of unvaccinated patients; 93.5% were vaccinated. Nineteen patients (68%) were vaccinated before COVID-19 infection. Our patients received the CoronoVac (Sinovac, China) vaccine. CONCLUSION: COVID-19 infection is more likely to be severe and mortal in patients with heart transplant recipients. It is also crucial to comply with preventive measures other than immunization in this group of patients. This study is the largest series investigating COVID-19 infection in heart transplant recipient patients in our country.

Association of Age, Sex, and Heart Failure Etiology in Continuous Flow Left Ventricular Assist Device Patients.

BACKGROUND: Advanced heart failure studies demonstrate that ischemic factors increase in prevalence with age and are more prominent in men. Ejection fraction (EF) cannot be preserved in these patients, and ischemic cardiomyopathy develops. Non-ischemic factors are more prominent in female heart failure patients, where the EF is preserved. Although an age-associated increase in the rate of heart failure is acknowledged in both sexes, etiologic classifications by sex-based age groups are still lacking. This study examined the etiology of heart failure according to age and sex in ventricular assist device patients. METHODS: The patient population included 457 end-stage heart failure patients who received a continuous flow-left ventricular assist device at Ege University Hospital between 2010 and 2017. Age, sex, and cardiomyopathy etiology data were obtained from the hospital database. The Mann-Whitney U test was applied to test the statistical significance among subgroups (95% CI, P < .05 for statistical significance). RESULTS: The prevalence of ischemic cardiomyopathy was significantly lower in male patients aged 18 to 39 years compared to older patients. Conversely, no difference was seen among female patients. The prevalence of dilated cardiomyopathy was higher in male patients who were 18 to 39 years of age compared to older patients, but no difference was present among the female patients. CONCLUSIONS: Age and heart failure etiology were demonstrated to be interrelated in men but not in women. The fact that etiologic factors of advanced heart failure in women have a wider range than in men makes the current classification systems insufficient for use in female populations.

Antibody Response to SARS-CoV-2 Vaccination in Heart Failure Patients: Retrospective Single-Center Cohort Study.

We sought to investigate the impact of heart failure on anti-spike antibody positivity following SARS-CoV-2 vaccination. Our study included 103 heart failure (HF) patients, including those with and without left ventricular assist devices (LVAD) selected from our institutional transplant waiting list as well as 104 non-heart failure (NHF) patients who underwent open heart surgery at our institution from 2021 to 2022. All the patients received either heterologous or homologous doses of BNT162b2 and CoronaVac. The median age of the HF group was 56.0 (interquartile range (IQR): 48.0-62.5) and the NHF group was 63.0 (IQR: 56.0-70.2) years, and the majority were males in both groups (n = 78; 75.7% and n = 80; 76.9%, respectively). The majority of the patients in both the HF and NHF groups received heterologous vaccinations (n = 43; 41.7% and n = 52; 50.3%, respectively; p = 0.002). There was no difference in the anti-spike antibody positivity between the patients with and without heart failure (p = 0.725). Vaccination with BNT162b2 led to significantly higher antibody levels compared to CoronaVac alone (OR: 11.0; 95% CI: 3.8-31.5). With each passing day after the last vaccine dose, there was a significant decrease in anti-spike antibody positivity, with an OR of 0.9 (95% CI: 0.9-0.9). Furthermore, hyperlipidemia was associated with increased antibody positivity (p = 0.004).

Donor heart selection: Evidence-based guidelines for providers.

The proposed donor heart selection guidelines provide evidence-based and expert-consensus recommendations for the selection of donor hearts following brain death. These recommendations were compiled by an international panel of experts based on an extensive literature review.