Brazilian Guidelines for Cardiac Implantable Electronic Devices - 2023.

72 Subsequent studies comparing long-term single-chamber vs dual-chamber pacing showed a trend towards lower rates of recurrent syncope and presyncope in patients with dual-chamber pacing 73 - 76 ( Table 6 ). 2.4.

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Among conventional risk factors, a family history of SCD likely or definitely due to HCM in first-degree relatives aged ≤ 50 years, especially during childhood or adolescence, is highly significant. 289 Another risk marker for SCD is the extent and magnitude of hypertrophy, especially when wall thickness ≥ 30mm; borderline thickening (28 to 29 mm) may be considered at the cardiologist’s discretion.

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