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Related Experiment Videos

Survival in second degree atrioventricular block.

D B Shaw, C A Kekwick, D Veale

    British Heart Journal
    |June 1, 1985
    PubMed
    Summary
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    Chronic Mobitz type I heart block has a similar prognosis to Mobitz type II. Pacemaker implantation significantly improves survival for both, refuting the benign reputation of Mobitz type I.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Internal Medicine

    Background:

    • Chronic second-degree heart block affects prognosis and management.
    • Distinguishing Mobitz type I from Mobitz type II block is crucial for patient care.
    • The perceived benign nature of Mobitz type I block warrants re-evaluation.

    Purpose of the Study:

    • To compare the prognosis of chronic Mobitz type I and Mobitz type II heart block.
    • To evaluate the impact of pacemaker implantation on survival rates in patients with second-degree heart block.
    • To assess the influence of bundle branch block on the prognosis of heart block.

    Main Methods:

    • Retrospective analysis of 214 patients with chronic second-degree heart block from 1968-1982.
    • Patients categorized into Mobitz type I, Mobitz type II, and 2:1/3:1 block groups.

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  • Comparison of five-year survival rates between paced and unpaced patients, including age-matched cohorts.

    • Main Results:

    • Five-year survival rates were similar across Mobitz type I (57%), Mobitz type II (61%), and 2:1/3:1 block (53%) groups.
    • Pacemaker implantation significantly improved survival: 78% for paced vs. 41% for unpaced patients.
    • Bundle branch block presence did not significantly influence prognosis.

    Conclusions:

    • Chronic Mobitz type I heart block carries a prognosis similar to Mobitz type II block.
    • Unpaced patients with either type of block had poor outcomes.
    • Pacemaker implantation offers substantial survival benefits, suggesting similar implantation criteria for Mobitz type I and higher-degree blocks.