AI Article Synopsis
- The study investigates the relationship between biventricular pacing (CRT) and changes in QTc and QRS duration in heart failure patients, specifically looking at the impact on sustained ventricular tachyarrhythmias (sVTA).
- A total of 127 patients with drug-resistant heart failure were monitored, revealing that those with sVTA had longer paced QTc and QRS durations compared to those without.
- Findings suggest that while increased QTc and QRS durations are linked to sVTA occurrences, they were not immediate causes of death, indicating a need for further research into optimizing CRT to potentially reduce sVTA risks.
Article Abstract
Background And Objectives: QRS duration (QRSd) and prolonged corrected QT interval (QTc) are associated with ventricular arrhythmic events. This study was designed to determine whether CRT by means of biventricular pacing alters the QTc and QRSd, and whether such changes are related to the risk of sustained ventricular tachyarrhythmias (sVTA).
Methods And Results: A total of 127 patients (102 men, mean age 63.9 +/- 8.9 years) with drug-resistant heart failure and QRS duration > or = 130 ms underwent CRT/CRT-ICD. The aetiology of the heart failure was ischaemic in 41 patients (32.3%). After a median follow-up of 24 months, 42 sVTA occurred in 35 patients (27.6%). Twenty-nine patients had a single sVTA, in five patients two sVTA and in one patient three sVTA occurred. The paced QTc was longer in sVTA patients (505 +/- 55 ms) compared with no sVTA patients (486 +/- 44 ms, P < or = 0.003). Similar responses for paced QRSd were observed (182 +/- 27 ms in sVTA patients vs 167 +/- 27 ms in no-sVTA patients, P < or = 0.03). This effect was independent from intrinsic QTc and QRSd and the aetiology of the heart failure. The mortality rate was significantly higher in patients with ventricular fibrillation and fast VT (P < or = 0.004) who experienced shock therapies. However, the sVTA were not the immediate cause of death.
Conclusions: A pacing-induced increase in QTc and QRSd is related to sVTA in patients with CRT. Further studies are needed to determine whether optimization of CRT with the goal to achieve a narrow paced QRSd can reduce the occurrence of sVTA.
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| http://dx.doi.org/10.1080/ac.66.4.2126587 | DOI Listing |
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