Why the study?
Does a prolonged H-Q interval predict AV block, and does prophylactic pacing improve outcomes in patients with chronic bundle branch block?
Population
401 patients with chronic bundle branch block
Comparison
Electrophysiologic studies measuring infranodal… vs Patients with H-Q < 70 ms; unpaced patients
Design
Cohort
Follow-up
mean approximately 30 months
Authors
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Prolonged H-Q may stratify AV block risk in bundle branch block; leaves open whether prophylactic pacing improves outcomes.
Does a prolonged H-Q interval predict AV block, and does prophylactic pacing improve outcomes in patients with chronic bundle branch block?
A markedly prolonged H-Q interval (≥ 100 ms) is valuable for detecting spontaneous AV block risk, but prophylactic pacing offers no benefit for symptom relief or survival in patients with bundle branch block.
Scheinman et al. (1983) studied this question.
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