Meta-analysis of Pulsed Field Ablation Versus Thermal Ablation for Pulmonary Vein Isolation in AF: A Broad Overview Focusing on Efficacy, Safety and Outcomes.

The recently established non-thermal, single-shot pulsed field ablation (PFA) is a potential tool for achieving rapid pulmonary vein isolation (PVI) to cause cell death by electroporation, yet data regarding this state-of-the-art technology remain sparse. In this meta-analysis, we included 3,857 patients from 20 studies. There was no significant difference in AF recurrence between the PFA and control groups. Subgroup analysis showed that additional ablation beyond PVI has a similar rate of AF recurrence to PVI alone (10% versus 13%, respectively). PVI durability was achieved in 83% (mean), 95% CI [65-99%] of the PFA group and in 79% (mean), 95% CI [60-98%] of the control group, with no significant difference in the rate of PVI durability between the two groups. The PFA group had considerably reduced procedure duration, but not fluoroscopy time. No statistically significant differences in periprocedural complications were observed. PFA is associated with shorter procedural time than thermal ablation. Cardiac complications were uncommon and mainly reversible in both the PFA and control groups.

A meta-analysis of the distance between lead-implanted site and tricuspid valve annulus with postoperative tricuspid regurgitation deterioration in patients with left bundle branch area pacing.

Tricuspid regurgitation (TR) is a known complication of cardiac implantable electrical devices (CIEDs), with prevalences ranging from 10% to as high as 30%. Despite left bundle branch area pacing (LBBAP) has emerged as an alternative to the limits of His-bundle pacing (HBP), the long-term safety of this procedure, notably the worsening of TR after implantation, has yet to be thoroughly investigated. This meta-analysis sought to determine the frequency of post-LBBAP TR deterioration and identify the predictors, particularly the distance between lead-implanted site and the tricuspid valve annulus (lead-TA-distance). A systematic literature search was conducted using PubMed, Europe PMC, and ScienceDirect for studies that reported the incidence of deterioration and measurement of TR grade at baseline and follow-up following LBBAP, in addition to the differences in exposure between short and long lead-TA-distances. A total of three studies involving 480 participants were included in this meta-analysis. The incidence of TR deterioration was 22%. Patients with TR deterioration also demonstrated a significantly shorter lead-TA-distance in comparison to the opposing group (MD: -5.74 mm (-0.70, -10.78); p < .001; I2 = 92.6%). The pooled results of three comparative studies suggest that participants in the longer lead-TA-distance group had a significant decrement in the likelihood of TR worsening (adjusted OR = 0.59 (0.36-0.96); p = .034; I2 = 79%). Multivariate analysis conducted in each of the included investigations supported the independence of the connection between lead-TA-distance and TR deterioration. A shorter lead-TA-distance was an independent risk factor for TR deterioration in individuals with post-LBBAP implantation.

The pivotal role of compelling high-risk electrocardiographic markers in prediction of ventricular arrhythmic risk in arrhythmogenic right ventricular cardiomyopathy: A systematic review and meta-analysis.

INTRODUCTION: Several investigations have shown that existing risk stratification processes remain insufficient for stratifying sudden cardiac death risk in arrhythmogenic right ventricular cardiomyopathy (ARVC). Multiple auxiliary parameters are investigated to offer a more precise prognostic model. Our aim was to assess the association between several ECG markers (epsilon waves, prolonged terminal activation duration (TAD) of QRS, fragmented QRS (fQRS), late potentials on signal-averaged electrocardiogram (SA-ECG), T-wave inversion (TWI) in right precordial leads, and extension of TWI in inferior leads) with the risk of developing poor outcomes in ARVC. METHODS: A systematic literature search from several databases was conducted until September 9th, 2023. Studies were eligible if it investigated the relationship between the ECG markers with the risk of developing ventricular arrhythmic events. RESULTS: This meta-analysis encompassed 25 studies with a total of 3767 participants. Our study disclosed that epsilon waves, prolonged TAD of QRS, fQRS, late potentials on SA-ECG, TWI in right precordial leads, and extension of TWI in inferior leads were associated with the incremental risk of ventricular arrhythmias, implantable cardioverter-defibrillator shock, and sudden cardiac death, with the risk ratios ranging from 1.46 to 2.11. In addition, diagnostic test accuracy meta-analysis stipulated that the extension of TWI in inferior leads had the uppermost overall area under curve (AUC) value amidst other ECG markers apropos of our outcomes of interest. CONCLUSION: A multivariable risk assessment strategy based on the previously stated ECG markers potentially enhances the current risk stratification models in ARVC patients, especially extension of TWI in inferior leads.

Role of N-terminal pro-B type natriuretic peptide as a predictor of poor outcomes in patients with HFrEF receiving primary prevention implantable cardioverter-defibrillator therapy: a systematic review and dose-response meta-analysis.

INTRODUCTION: Several studies have demonstrated that combining left ventricular ejection fraction and New York Heart Association functional class is insufficient for predicting risk of appropriate implantable cardioverter-defibrillator (ICD) shock in primary prevention candidates. Hence, our aim was to assess the relationship between N-terminal pro-B type natriuretic peptide (NT-pro BNP) along with appropriate ICD shock and all-cause mortality in order to improve the stratification process of patients with heart failure with reduced ejection fraction (HFrEF) being considered for primary preventive ICD therapy. METHODS: A systematic literature search from several databases was conducted up until 9 June 2022. Studies were eligible if they investigated the relationship of NT-pro BNP with all-cause mortality and appropriate ICD shock. RESULTS: This meta-analysis comprised nine studies with a total of 5117 participants. Our study revealed that high levels of NT-pro BNP were associated with all-cause mortality (HR=2.12 (95% CI=1.53 to 2.93); p<0.001, I2=78.1%, p<0.001 for heterogeneity) and appropriate ICD shock (HR=1.71 (95% CI=1.18 to 2.49); p<0.001, I2=43.4%, p=0.102 for heterogeneity). The adjusted HR for all-cause mortality and appropriate ICD shock increased by approximately 3% and 5%, respectively per 100 pg/mL increment pursuant to concentration-response model (Pnon-linearity <0.001). The curves became steeper after NT-pro BNP reached its inflection point (3000 pg/mL). CONCLUSION: A positive concentration-dependent association between elevated NT-pro BNP levels along with the risk of all-cause mortality and appropriate ICD shock was found in patients with HFrEF with ICD. PROSPERO REGISTRATION NUMBER: CRD42022339285.

Investigation of High-Risk Electrocardiographic Markers as Predictors of Major Arrhythmic Events in Brugada Syndrome: A Systematic Review and Meta-analysis.

Numerous studies have demonstrated that a type I Brugada electrocardiographic (ECG) pattern, history of syncope, prior sudden cardiac arrest, and previously documented ventricular tachyarrhythmias are still insufficient to stratify the risk of sudden cardiac death in Brugada syndrome (BrS). Several auxiliary risk stratification parameters are pursued to yield a better prognostic model. Our aim was to assess the association between several ECG markers (wide QRS, fragmented QRS, S-wave in lead I, aVR sign, early repolarization pattern in inferolateral leads, and repolarization dispersion pattern) with the risk of developing poor outcomes in BrS. A systematic literature search from several databases was conducted from database inception until August 17th, 2022. Studies were eligible if it investigated the relationship between the ECG markers with the likelihood of acquiring major arrhythmic events (MAE). This meta-analysis comprised 27 studies with a total of 6552 participants. Our study revealed that wide QRS, fragmented QRS, S-wave in lead I, aVR sign, early repolarization pattern in inferolateral leads, and repolarization dispersion ECG pattern were associated with the incremental risk of syncope, ventricular tachyarrhythmias, implantable cardioverter-defibrillator shock, and sudden cardiac death in the future, with the risk ratios ranging from 1.41 to 2.00. Moreover, diagnostic test accuracy meta-analysis indicated that the repolarization dispersion ECG pattern had the highest overall area under curve (AUC) value amid other ECG markers regarding our outcomes of interest. A multivariable risk assessment approach based on the prior mentioned ECG markers potentially improves the current risk stratification models in BrS patients.

Relation Between Glycemic Control and Cardiac Autonomic Neuropathy in Patients With Diabetes Mellitus Type 2.

BACKGROUND: Glycemic control is very important in type 2 diabetic patients. Microangiopathy is the first chronic complications in type 2 diabetic patients. Cardiac autonomic neuropathy can be used as a tool for early detection of complication in type 2 diabetic that relates well with cardiovascular morbidity and mortality. The aim of this study was to analyze the correlation between glycemic control and cardiac autonomic neuropathy in type 2 diabetic patients. METHODS: It was an observational cross sectional with correlative analysis conducted on type 2 diabetic at Hasan Sadikin hospital within July until August 2019. Value of HbA1c, fasting plasma glucose, and post prandial plasma glucose within 2 years were obtained with NGSP standard of examination. Cardiac autonomic neuropathy was assessed by Cardiovascular Autonomic Reflex Testing's (CARTs) with Bellevere scoring system. RESULT: The research was conducted on 39 subjects with mean age 56 ± 7,05 years (48,7% males and 51,3% women). Median value of the last HbA1c was 7,6% (5,2%-12,9%) and mean HbA1c in the last 2 years was 8,1 ± 1,88%. Median CARTs score was 5 (1-8). Rank-Spearman correlation analysis showed significant moderately positive correlation between HbA1c and CARTs score (r = 0,454, CI 95% 0,187-0,772, P = 0,004) and also mean HbA1c within the last 2 years with CARTs score (r = 0,564, IK 95% 0,289-0,839, P = 0,000). Multivariate analysis, mean HbA1c remained correlated significantly with CARTs score even after adjustment toward age, gender, duration of diabetes, and diabetic therapy. CONCLUSION: There is significant moderately positive correlation between glycemic control and cardiac autonomic neuropathy in type 2 diabetic patients.

Left Volume Atrial Index and P-wave Dispersion as Predictors of Postoperative Atrial Fibrillation After Coronary Artery Bypass Graft: A Retrospective Cohort Study.

Preoperative left atrial remodeling as Postoperative atrial fibrillation (POAF) predisposing factors could be measured by left atrial volume index (LAVI) and P-wave dispersion. This study aimed to assess P-wave dispersion and LAVI as preoperative predictors of POAF among patients who underwent Coronary Artery Bypass Graft (CABG). An analytical retrospective cohort study was performed on patients who underwent CABG. The P-wave dispersion and POAF were evaluated based on documented ECG results. LAVI size was collected from echocardiographic reports. Hazard ratios of P-wave dispersion and LAVI for POAF were analyzed using Cox proportional hazard model. A total of 42 subjects (57 ± 1 years) were included in this study. POAF occurred in 28.6% of patients at a median of 2 days after CABG. P-wave dispersion was significantly longer in patients in whom AF was developed (53.03 ± 3.82 ms vs 44.01 ± 1.98ms, p:0.028), while LAVI difference was not significant. The Cox proportional hazard model showed a significant association between P-wave dispersion and risk of POAF (HR 1.05, CI95%, 1.001-1.103; P = 0.048). There was no association between LAVI and risk of POAF (HR 1.003, CI 95%, 0.965-1.044; P = 0.864). P-wave dispersion is a predictor of POAF in patients who underwent CABG. Risk stratification using P-wave dispersion enables clinicians to identify high-risk patients before CABG surgery.

Very-high-power Short-duration Ablation versus Conventional Ablation for Pulmonary Vein Isolation in Atrial Fibrillation: Systematic Review and Meta-analysis.

The aim of this study was to compare the effectiveness and safety of very-high-power short-duration (VHPSD) ablation (70-90 W/4-7 s) with conventional ablation (30-40 W/>20 s, 50 W/7-11 s) for pulmonary vein isolation (PVI) in patients with AF. A total of 13 studies were included in this analysis (1,527 patients). AF recurrence occurred in 14% (95% CI [11-18%]) of the VHPSD group. VHPSD was associated with lower AF recurrence (OR 0.65; 95% CI [0.48-0.89]; p=0.006) compared with the conventional ablation group. Subgroup analysis showed that additional ablation beyond PVI had a similar rate of AF recurrence (16% versus 10%) compared with PVI alone. Procedure and ablation durations were significantly shorter in the VHPSD group with a mean differences of -14.4 minutes (p=0.017) and -14.1 minutes (p<0.001), respectively. Complications occurred in 6% (95% CI [3-9%]) of the VHPSD group, and the rate was similar between the two groups (OR 1.03; 95% CI [0.60-1.80]; p=0.498). VHPSD ablation resulted in less AF recurrence and a shorter procedure time. Additional ablation beyond PVI alone in VHPSD may not provide additional benefits.

Revisiting exercise-induced premature ventricular complexes as a prognostic factor for mortality in asymptomatic patients: A systematic review and meta-analysis.

Background: Recent investigations suggest that premature ventricular complexes (PVCs) during an exercise test are associated with an elevated risk of mortality in asymptomatic individuals. However, given the small number of studies included, the association between these two entities in the asymptomatic population remains obscure. Our aim was to evaluate this matter. Methods: A comprehensive literature search was conducted utilizing several online databases up to April 2022. The study comprised cohort studies examining the relationship between exercise-induced premature ventricular complexes (EI-PVCs) and all-cause mortality (ACM) as well as cardiovascular mortality (CVM) in asymptomatic populations. To provide diagnostic values across the statistically significant parameters, we additionally calculated sensitivity, specificity, and area under the curve (AUC). Results: A total of 13 studies consisting of 82,161 patients with a mean age of 49.3 years were included. EI-PVCs were linked to an increased risk of ACM (risk ratio (RR) = 1.30 (95% confidence interval (CI) = 1.18-1.42); p < 0.001; I 2 = 59.6%, p-heterogeneity < 0.001) and CVM (RR = 1.67 (95% CI = 1.40-1.99); p < 0.001; I 2 = 7.5%, p-heterogeneity = 0.373). Subgroup analysis based on the frequency of PVCs revealed that frequent PVCs were similarly related to a higher risk of ACM and CVM, but not infrequent PVCs. Moreover, diagnostic test accuracy meta-analysis showed that recovery phase EI-PVCs have a higher overall specificity than exercise phase EI-PVCs regarding our outcomes of interest. Conclusion: EI-PVCs are correlated with a higher risk of ACM and CVM. When compared to the exercise phase, the specificity of PVCs generated during the recovery period in predicting interest outcomes is higher. As a result, we propose that the exercise ECG be utilized on a regular basis in middle-aged asymptomatic individuals to measure the frequency of PVCs and stratify the risk of mortality. Systematic review registration: [https://www.crd.york.ac.uk/prospero/display_record.php?RecordID=328852], identifier [CRD42022328852].

Predictors of In-Hospital Mortality in Patients with Acute Coronary Syndrome in Hasan Sadikin Hospital, Bandung, Indonesia: A Retrospective Cohort Study.

BACKGROUND: Acute coronary syndrome (ACS) is a world health problem with a high mortality rate and is expected to continue to rise in number. The high ACS mortality rate in the hospital is influenced by demographic characteristics, cardiovascular risk factors, clinical presentation, and management. This study aimed to determine the predictors of ACS death at Dr. Hasan Sadikin Hospital Bandung as the highest referral center in West Java. METHODS: This study is a retrospective cohort study on all ACS patients undergoing treatment at Dr. Hasan Sadikin Hospital Bandung from January 2018 to December 2019. Multivariate analysis was performed using a logistic regression test with the backward method to assess predictors of patient outcomes. RESULTS: This study involved 919 patients with the in-hospital mortality rate was 10.6%. Multivariate analysis showed that age >65 years was a demographic factor that play a role as a predictor of mortality mortality (AOR 2.143; 95% CI = 1.079-4.256; p = 0.030). Clinical presentation of cardiac arrest arrest (AOR 48.700; 95% CI =14.289-165.980; p<0.001), SBP <90 mmHg (AOR: 4.972; 95% CI =1.730-14.293; p=0.003, heart rate >100 beats per minute (AOR 4.285; 95% CI =2.209-8.310; p<0,001), cardiogenic shock (AOR: 5.433; 95% CI= 2.257-13.074; p<0.001). Cardiovascular management can reduce the risk of in-hospital mortality. Multivariate analysis showed statins (AOR 0.155; 95% CI=0.040-0.594; p=0.007), beta blockers (AOR 0.304; 95% CI=0.162-0.570; p<0,001) and Percutaneous Coronary Intervention (AOR 0.352; 95% CI=0.184-0.673; p=0.002) significantly reduce in-hospital mortality. Interestingly, smoking is associated with a lower mortality rate (OR 0.387; p <0.001). CONCLUSION: Clinical presentation of cardiac arrest has the highest risk of death, the sequence is cardiogenic shock, heart rate >100 beats per minute, and age >65 years. Administration of statins, beta-blockers, PCI, and smoking are factors that reduce the risk of death.

Total atrioventricular block in pregnancy -Case report.

Introduction and importance: Bradycardia in pregnancy due to total atrioventricular block (TAVB) is a rare occurrence, often asymptomatic and may arise from a congenital disorder. Pacemaker is often required. Cases are few and management is not yet standardised. Case presentation: A 24-year-old G2P0A1 of 9 months gestation presented with labor pains. She had had history of bradycardia diagnosed since a year prior but had not undergone tests nor received treatments. Her heart rate was 55-60 x/minute, her cardiotocography was reassuring and electrocardiogram revealed a TAVB with ventricular escape rhythm. As she had not had a pacemaker, an urgent cardiologist consultation was arranged during which a temporary pacemaker was installed. She underwent a caesarean section with general anaesthesia after which she had an uneventful recovery.A 38-year-old G2P1A0 of 2 months of gestation presented with slow heart rhythm and a history of asthma to the outpatient clinic. She also had not undergone tests nor received medication. At presentation, her heart rate was 48 x/minute and her ECG revealed a TAVB with junctional escape rhythm. She had a pacemaker installed at 8 months of gestation and subsequently underwent an elective caesarean section at 37 weeks under regional anaesthesia. She had an uneventful recovery afterwards. Clinical discussion: TAVB in pregnancy requires a concerted effort involving obstetricians, cardiologists, and intensivists. Pacemaker implantation is recommended. Whilst vaginal delivery remains first-choice, caesarean section is indicated under obstetric indications. Conclusion: Screening, early recognition, risk stratification and thorough planning are required to successfully manage TAVB in pregnancy.

The Influence of Right Ventricular Pacing Location, Pacing Burden and Paced QRS Duration to Subclinical Left Ventricular Systolic Dysfunction as Shown by Global Longitudinal Strain Echocardiography.

BACKGROUND: Prolonged pacing of the right ventricle (RV) is associated with left ventricular (LV) systolic dysfunction. Several studies have shown that the RV pacing location, pacing burden (percentage), and paced QRS duration may affect LV systolic function. Subclinical LV dysfunction may occur early after implantation of a permanent pacemaker (PPM). Therefore, this study aims to detect early subclinical LV systolic dysfunction measured by global longitudinal strain (GLS) using speckle tracking echocardiography (STE) at one month after PPM implantation. METHODS: A single-center, prospective cohort study was conducted, and all patients indicated for PPM implantation with preserved LV systolic function were included. Data of RV pacing location (RV apical vs right ventricular outflow tract (RVOT), pacing burden (percentage) (≤40% vs >40%), and paced QRS duration (≤150 ms and >150 ms) were obtained. The change of GLS was also measured before and one month after PPM implantation (delta GLS). RESULTS: 37 patients were enrolled in this study, which demonstrated significant difference between GLS before (-20.30 SD 3.38) and after (-16.93 SD 3.47) PPM implantation (p=<0.001). There were no significant difference in delta GLS either between patients with RV pacing location on RV apical vs RVOT ((2.30 (0.00-10.50) vs 2.95(0.10-8.30), p=0.648) or between patient with paced QRS duration ≤150ms vs >150ms ((1.70 (0.30-8.30) vs 3.45 (0.0-10.5)), p=0.266). Meanwhile, there was a significant difference of delta GLS between patients with pacing burden ≤40% vs >40% (Mean 1.92 SD 1.37 vs 3.98 SD 3.04), p=0.007). Further analysis found that pacing burden only affected the delta GLS in group with apical RV pacing (≤40% (1.58 SD 0.59) vs > 40% (4.67 SD 3.47), p = 0.008) and did not affect the delta GLS in group with RVOT pacing (≤40% (2.32 SD 1.98) vs > 40% (3.29 SD 2.48), p = 0.446). CONCLUSION: The pacing parameter, particularly pacing burden > 40% may induce the subclinical LV systolic dysfunction after one month of pacemaker implantation as shown by decline of GLS,  especially when the RV pacing location was placed on apical.

Cardiotoxicity by Anthracycline Regimen Chemotherapy Prolonged T Peak to T End Interval.

BACKGROUND: Myocardial necrosis may occur due to anthracycline (doxorubicin/adriamycin) chemotherapy usage. Furthermore, myocardial necrosis can affect the heterogeneity of heart conduction system and lead to repolarization abnormalities. The aim of this study was to investigate the effect of cardiotoxicity caused by anthracycline to repolarization abnormalities measured by T peak to T end (TpTe) interval. METHODS: This was a single center prospective cohort study with linear regression from October 2018 to May 2019. The subjects of the study were breast cancer patients after completing administration of chemotherapy with fluorouracil, adriamycin and cyclophosphamide (FAC) regimen (containing anthracycline) for 6 months. Myocardial necrosis was assessed by high sensitive (hs)-troponin I, and the heterogeneity of repolarization was measured by TpTe interval. RESULTS: This study involved 25 breast cancer patients after chemotherapy in the 6-month FAC regimen. The mean age is 46 ± 7 years, and the cumulative dose of anthracycline is 591 ± 52 mg/m2. The mean level of hs-troponin I is 90.5 ± 44.7 ng/L and the TpTe interval is 108.2 ± 10 ms. The results of linear regression analysis showed a positive correlation between hs-troponin I and TpTe interval (r: 0.421, P: 0.036) after controlling for one confounding variable (cumulative dose of anthracycline). CONCLUSIONS: Cardiotoxicity caused by accumulative dose of anthracycline may lead to myocardial necrosis which was shown by elevated hs-troponin I levels. This process may lead to heterogeneity conduction system that affect the repolarization phase of cardiac cycle which was shown by increased TpTe interval.

Correlation Between T Peak to End Interval and Left Ventricular Time to Peak Longitudinal Strain in Ischemic Cardiomyopathy Patients.

BACKGROUND: Ischemic cardiomyopathy is the most frequent etiology of heart failure with reduced ejection fraction (HFrEF) and a result of ventricular structural, functional and electrical remodeling. T peak to end (Tpe) interval is an electrocardiographic parameter that represents repolarization heterogeneity and had prognostic value for ventricular arrhythmia. Patients with ischemic cardiomyopathy face a significant burden of arrhythmias. Mechanical dispersion is a functional remodeling parameter that can be measured by time to peak longitudinal strain using speckle tracking echocardiography. This study aimed to assess the relationship between Tpe interval with time to peak longitudinal strain in ischemic cardiomyopathy patients. METHODS: This study was conducted with an observational analytical cross-sectional design. Ischemic cardiomyopathy subjects were included at Dr. Hasan Sadikin General Hospital, Bandung, from August to October 2019. Tpe interval was measured manually with the tangential method. Time to peak longitudinal strain was measured using speckle tracking echocardiography. The correlation between Tpe interval and time to peak longitudinal strain was analyzed using Pearson correlation. RESULTS: A total of 30 subjects were included in this study. The average age was 58 ± 8 years old, and the average left ventricular ejection fraction was 27±5.5%. The average of Tpe interval was 83.4 ± 7.62 ms, and the average time to peak longitudinal strain was 93.13 ± 34.51 ms. The Pearson correlation test showed a significant weak positive correlation (r = 0.386, 95% confidence interval: 0.029 - 0.743, P = 0.018) between Tpe interval and time to peak longitudinal strain in ischemic cardiomyopathy patients. CONLUCIONS: There was a significant weak positive correlation between Tpe interval and time to peak longitudinal strain in ischemic cardiomyopathy patients.

T-Peak to T-End Improvements After Beta-Blocker Administration in Peripartum Cardiomyopathy Patients.

BACKGROUND: Many studies have shown that T-peak to T-end (TPTE) interval was associated with sudden cardiac events. Peripartum cardiomyopathy (PPCM) causes reversible left ventricle systolic dysfunction which may deteriorate into sudden cardiac death. This study aimed to evaluate beta-blocker as an antiarrhythmic agent to improve TPTE interval as a prognostic value of sudden cardiac death. METHODS: A cohort experimental prospective study was performed. The PPCM was diagnosed from the emergency ward. A total of 54 cases were identified from 2014 to 2016. Thirty-four patients were followed up for further analysis. Electrocardiograms were conducted in all the patients, and TPTE interval was measured. After a follow-up of 6 months of beta-blocker treatment, the echocardiography and TPTE interval were measured again to obtain the repolarization heterogeneity. RESULTS: The mean age of subjects was 32 ± 6.4 years. The mean left ventricular ejection fraction (LVEF) was 32.24±6.3%. The mean TPTE interval was 123.7 ± 28.2 ms. After 6 months of beta-blocker administration, the mean LVEF was 58.26±4.4% and the mean TPTE was 98.7 ± 39.5 ms. The paired t-test showed a significant difference between TPTE interval pre- and post-administration of beta-blocker (P value < 0.001). CONCLUSIONS: There is an improvement of TPTE in PPCM patients after 6 months of beta-blocker administration. Administration of beta-blocker in PPCM patients is expected to prevent sudden cardiac death in PPCM populations.

Prolonged Ventricular Dyssynchrony Due to Atrial Fibrillation and Pre-Excitation Syndrome Induced Cardiomyopathy.

Various degree of ventricular activation by accessory pathway (AP) and normal conduction system in a patient with pre-excited atrial fibrillation (AF) may lead to ventricle dyssynchrony and cardiomyopathy.

Persistent VA dissociation during atrioventricular nodal reentry tachycardia: The existence of upper common pathway.

The existence of the upper common pathways is not well-established yet. This case describes atrioventricular nodal reentry tachycardia with persistent ventriculoatrial dissociation that proof of upper common pathway existence.