Defibrillators – ABC CARDIOL

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Letter to the Editor

Broadening Insights into Implantable Cardioverter Defibrillator Appropriateness: The Role of Economic and Psychosocial Markers, Cardiomyopathy Subtypes, and Advanced Therapies

Ömer Faruk Yılmaz et al. Yusuf Ziya Şener

Dear Editor,

We read with great interest the article by Carvalho et al. titled “Potentially Inappropriate Cardioverter Defibrillator Implants in Secondary Prevention of Death”, which highlights the critical role of socioeconomic and psychosocial markers (EPSM) in predicting early mortality post-implantable cardioverter defibrillator (ICD) implantation. While the study provides valuable insights into multidisciplinary team (MDT) assessments, we would like to address two significant limitations that could refine future research and clinical practice.

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Editorial

Defibrillation Threshold in Patients with Chronic Chagas’ Heart Disease: Are There Benefits or not Worth the Risk?

Ricardo Alkmim Teixeira

The implantable cardioverter-defibrillator (ICD) is the best therapeutic option to prevent sudden cardiac death for several high-risk groups of patients. Basically, the ICD can recognize and stop ventricular tachycardia (VT) and ventricular fibrillation (VF) by triggering anti-tachycardia pacing (ATP) or shock therapy. The defibrillation threshold (DT) is the minimum shock energy required to terminate VF.

Historically, testing the ICD function via induction and termination of VF was considered mandatory to ensure that the ICD could properly detect and stop the arrhythmic event.

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Original Article

Non-Sustained Ventricular Tachycardia Episodes Predict Future Hospitalization in ICD Recipients with Heart Failure

Fatih Mehmet Uçar et al. Mustafa Adem Yilmaztepe Gökay Taylan Meryem Aktoz

Abstract

Background:

Implantable cardioverter-defibrillator (ICD) therapy is well known to reduce mortality in selected patients with heart failure (HF).

Objective:

To investigate whether monitored episodes of non-sustained ventricular tachycardia (NSVT) might predict future HF hospitalizations in ICD recipients with HF.

Methods:

We examined 104 ICD recipients (mean age: 60 ± 10.1 years, 80.8 % male) with HF who were referred to our outpatient clinic for device follow-up. After device interrogation, patients were divided into NSVT positive and negative groups. The primary endpoint was the rate of hospitalization within the next 6 months after initial ICD evaluation.

Results:

Device evaluation demonstrated at least one episode of monitored NSVT in 50 out of 104 patients. As expected, no device therapy (shock or anti-tachycardia) was needed for such episodes. At 6 months, 24 patients were hospitalized due to acute decompensated HF. Hospitalization rate was significantly lower in the NSVT negative as compared with positive groups (38% versus 62%; adjusted hazard ratio [HR] 0.166 ; 95% CI 0.056 to 0.492; p = 0.01).

Conclusions:

Monitored NSVT bouts in ICD recordings may serve as a predictor of future HF hospitalizations in ICD recipients with HF suggesting optimization of therapeutic modalities in these patients along with a close supervision in the clinical setting.

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Case Report

Ventricular fibrillation during sport activity successfully treated

Maria Margarita Gonzalez et al. Flávio Rocha Brito Marques Caio Brito Vianna Carlos Alberto Eid … Gilson Soares Feitosa-Filho Sergio Timerman

Survival after out-of-hospital cardiopulmonary arrest is estimated at less than 5%. We report a case of ventricular fibrillation during sports activity. Cardiopulmonary resuscitation was initiated early by a layperson, and defibrillation was successfully performed within less than three minutes, with an automated external defibrillator. The public access to defibrillation programs has increased the survival after out-of-hospital ventricular fibrillation. We should encourage the training of laypeople in relation to the use of automated external defibrillators and the Basic Life Support program by stimulating their implementation in places where large numbers of people gather or where people are at a high risk of sudden death, as is the case of sports centers.

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Artigo Original

Incidence of shock and quality of life in young patients with implantable cardioverter-defibrillator

Roberto Costa et al. Kátia Regina da Silva Rodrigo Castro Mendonça Silvana Nishioka … Sérgio Siqueira Wagner Tetsuji Tamaki Elizabeth Sartori Crevelari Luiz Felipe Pinho Moreira Martino Martinelli Filho

OBJECTIVES: To analyze the incidence and causes of ICD therapies in children and young adults and verify their impact on the quality of life (QoL). METHODS: From March/1977 to February/2006, 29 patients (15.7±5.4 years old) were submitted to ICD implants. Aborted cardiac arrest (41.5%), sustained ventricular tachycardia (27.6%) and primary prophylaxis of sudden cardiac death (30.9%) indicated device therapy. The number of therapies was evaluated by interviewing patients and by ICD diagnostic data. The SF-36 questionnaire was used to measure the QoL and the results were compared to healthy population. The expectative of freedom from ICD therapies were estimated by the Kaplan-Meier method. RESULTS: After 2.6±1.8 years follow-up, 8 (27.6%) patients received 141 appropriate ICD shocks due to ventricular tachycardia (6) or ventricular fibrillation (2), and 11 (37.9%) patients received 152 inappropriate ICD shocks due to supraventricular tachyarrhythmias (8) or oversensing (3). Expectative of freedom from appropriate shocks was 74.2±9.0% and 66.7±10.7% after one and three years, respectively. Compared to healthy population, QoL decreased in physical function (61.7±28.7), vitality (64.7±19.1), mental health (65.9±22.7) and role-emotional domains (66.7±38.5). All patients referred fear and concern related to ICD use. CONCLUSION: Despite the efficacy of ICD therapies, the high incidence of appropriate and inappropriate shocks interfered in patients’ QoL and adaptation to the device.

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Broadening Insights into Implantable Cardioverter Defibrillator Appropriateness: The Role of Economic and Psychosocial Markers, Cardiomyopathy Subtypes, and Advanced Therapies

Defibrillation Threshold in Patients with Chronic Chagas’ Heart Disease: Are There Benefits or not Worth the Risk?

Non-Sustained Ventricular Tachycardia Episodes Predict Future Hospitalization in ICD Recipients with Heart Failure

Abstract

Background:

Objective:

Methods:

Results:

Conclusions:

Ventricular fibrillation during sport activity successfully treated

Incidence of shock and quality of life in young patients with implantable cardioverter-defibrillator

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