Radiofrequency ablation in patients with obstructive hypertrophic cardiomyopathy: An updated comprehensive review and meta-analysis.

BACKGROUND: Radiofrequency catheter ablation (RFCA) has emerged as a therapeutic option for surgical myectomy and alcohol septal ablation (ASA) in patients with hypertrophic obstructive cardiomyopathy (HOCM), but its efficacy remains unclear. AIM: Due to limited research on RFCA for HCM, there is an ongoing attempt to assess its efficacy and safety. METHODS: PubMed, Embase, and Scopus were systematically searched for studies assessing the efficacy outcomes for patients with HOCM who underwent RFCA. Mean differences (MDs) with 95% confidence intervals (CIs) were computed using a random-effects model and heterogeneity was assessed using I2 statistics. RESULTS: We included 11 studies comprising 470 patients, of whom 34.6% were female. The mean patient age ranged from 43.7 to 60.7 years. During the follow-up after RFCA, there was a significant decrease in the left ventricular outflow tract (LVOT) gradient at rest (MD -60.25 mmHg; 95% CI [-70.53;-59.14 mmHg]; p < 0.01) and during stimulation (MD -83.56 mmHg; 95% CI [-100.36;-66.76 mmHg]; p < 0.01). Moreover, RFCA reduced interventricular septum (IVS) thickness (MD -3.61 mm; 95% CI [-5.64; -1.59 mm]; p = 0.01) and New York Heart Association (NYHA) class (MD -1.46; 95% CI [-1.69; -1.24]; p < 0.01). CONCLUSIONS: In patients with HOCM, RFCA was associated with an improved NYHA class, reduced IVS thickness, and decreased LVOT gradient at rest and with stimulation.

Prevalence, Outcomes, and Risk Factors for Cardiorespiratory Arrest in the Intensive Care Unit: An Observational Study.

Background: Cardiorespiratory arrest is defined as an abrupt halt in the cardiac mechanical activity that is accompanied by the loss of a detectable pulse, the cessation of breathing, and the loss of consciousness. The aim of this study is to create a clinical-epidemiological profile of patients who experienced cardiorespiratory arrest and were admitted to the intensive care unit to evaluate the associated factors and their impact on the prognosis of these patients. Patients and methods: From January to December 2019, the medical records of 135 patients who received cardiopulmonary resuscitation were reviewed for this cross-sectional observational study. The information was collected according to the Utstein model. Results: A low return of spontaneous circulation of 22.2% was observed, with a predominance of females (53.3%) and older patients (68.9%), multiple comorbidities at admission (68.4%), and asystole as the predominant rhythm. Female sex and age >60 years were statistically significant (p = 0.017), as was the association between sex and comorbidities (p = 0.036), with heart disease being the most prevalent in females (p = 0.036). Conclusion: In this study, even though the resuscitation maneuver time (start of resuscitation following arrest) was very short and the defibrillation was performed promptly, there was a high prevalence of cardiac arrest and low survival rates after cardiopulmonary resuscitation. How to cite this article: Menezes da Silva A, Braga AL, Cruvinel de Souza V. Prevalence, Outcomes, and Risk Factors for Cardiorespiratory Arrest in the Intensive Care Unit: An Observational Study. Indian J Crit Care Med 2022;26(6):704-709.

Expression and clinical implications of HLA-G and PD-L1 following kidney transplantation: A cohort study.

Kidney transplantation (KT) is the preferred treatment for end-stage renal diseases. Human leukocyte antigen G (HLA-G) and programmed death-ligand 1 (PD-L1) have notable clinical and therapeutic significance in transplantation because of their roles in promoting tolerance. This study aimed to assess HLA-G and PD-L1 levels at various stages following KT. A cohort of 12 patients was monitored from the pretransplant phase to 12 months post-surgery. Blood samples were taken at specific intervals: before kidney transplantation (T0), and then on the 7th (T7), 30th (T30), 90th (T90), 180th (T180), and 365th days post transplantation. Renal biopsies were performed in patients with graft dysfunction. Plasma levels of soluble HLA-G (sHLA-G) and PD-L1 were quantified using enzyme-linked immunosorbent assays. Additionally, immunohistochemistry was used to detect the presence of both molecules in biopsy samples. Multivariate analysis indicated that episodes of rejection were correlated with decreased expression of sHLA-G (P < .001) and PD-L1 (P < .001). Over the course of the study, the sHLA-G levels also declined (P < .001). Patients who had been transfused had lower PD-L1 levels (P = .03). Furthermore, kidney recipients from related live donors had increased HLA-G expression (P < .001). Our findings suggest that diminished HLA-G and PD-L1 levels correlate with an increased risk of graft rejection. Notably, HLA-G expression significantly decrease after the third-month posttransplantation.

Systematic Review and Meta-Analysis of Clinical Outcome After Implantable Cardioverter-Defibrillator Therapy in Patients With Chagas Heart Disease.

OBJECTIVES: The goal of this analysis was to pool data from published studies on outcomes after implantable cardioverter-defibrillator (ICD) therapy in patients with Chagas heart disease (CHD). BACKGROUND: CHD is characterized by a high burden of ventricular arrhythmias and an increased risk of sudden cardiac death. The indications for ICD are not well established. METHODS: An extensive literature search without language restrictions was performed to identify all studies on ICD therapy in patients with CHD. A random effects model was used to calculate percentages and 95% confidence intervals (CIs). RESULTS: Of 397 articles screened, 13 studies (all observational) were included. There were 1,041 patients (mean age at implantation 57 ± 11 years; 64% men), most of whom (92%) received an ICD for secondary prevention. Antiarrhythmic medication consisted of amiodarone (79%) and beta-blockers (44%). Overall, the annual all-cause mortality rate was 9.0% (95% CI: 6.9 to 11.7) in 2.8 ± 1.9 years of follow-up, and the annual sudden cardiac death rate was 2.0% (95% CI: 1.3 to 3.3) in 2.6 ± 1.9 years. In addition, 24.8% (95% CI: 15.7 to 37.0) of patients received 1 or more appropriate interventions (shocks or antitachycardia pacing), 4.7% (95% CI: 3.2 to 6.9) received inappropriate shocks, and 9.1% (95% CI: 5.5 to 14.7) had electric storms annually. CONCLUSIONS: In patients with an ICD, annual all-cause mortality rate was 9%. Appropriate ICD interventions and electric storms were frequent, occurring at a rate of 25% and 9% per year, respectively. Inappropriate ICD shocks were not infrequent (5% per year). The benefits and risks of ICD therapy in patients with CHD should be carefully weighed until data from better studies become available.

Outcome of right ventricular bifocal pacing in patients with permanent atrial fibrillation and severe dilated cardiomiopathy due to Chagas disease: three years of follow-up.

OBJECTIVES OF STUDY: Several studies have shown that heart failure may benefit from cardiac resynchronization therapy (CRT). Studies have demonstrated a beneficial effect of right ventricular (RV) bifocal pacing, using two leads at different positions, in similar patient populations. The aim was to evaluate this approach in Chagas disease patients who developed both severe dilated cardiomiopathy and chronic atrial fibrillation. METHODS: The study included 30 patients with a mean age of 52 +/- 6 years (16 male), who had atrioventricular block at functional class II or IV (NYHA). Patients underwent endocardial dual-chamber pacemaker implantation with two RV leads-one placed near the RV outflow tract and the other in the apex. Patients were examined by echocardiography, 24-hour Holter, and New York Heart Association (NYHA) class determination before and 3, 6, 12, 18, 24, and 36 months after CRT. RESULTS: Compared to the baseline, the left ventricular ejection fraction increased in the first month of CRT, the left ventricular end diastolic diameter decreased, all patients were downgraded to NYHA class I or II, and the incidence of ventricular arrhythmias decreased. However, these could not be maintained and worsened after 6 months CRT. There was a mortality rate of 43.3% during the first year, and only 23.3% of patients remained alive after 3 years. They underwent an electrophysiological study, which revealed complex arrhythmias justifying implantable cardioverter defibrillator (ICD) in six out of seven patients. CONCLUSION: The favorable effects of RV bifocal pacing could not be maintained beyond the first 6 months, likely due to the ventricular arrhythmias. Therefore, CRT combined with ICD from the outset may be recommended for this patient group.