Key result
Pacing at 80-100 bpm is linked to increased myocardial blood flow in chronic complete heart block.
Why the study?
Does pacing at higher rates increase myocardial blood flow compared to baseline idioventricular rate in patients with chronic complete heart block?
Does pacing at higher rates increase myocardial blood flow compared to baseline idioventricular rate in patients with chronic complete heart block?
In patients with chronic complete heart block, myocardial blood flow increases as heart rate is increased via pacing.
Hypothesis-generating in chronic complete heart block; should not yet change clinical pacing practice.
Myocardial blood flow was measured in patients with chronic complete heart block at each patient's idioventricular rate and at a paced rate of 80 and 100/min. Myocardial flow was found to be positively related to the increase in heart rate and a possible mechanism for this is suggested.
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Hedworth-Whitty et al. (1970) studied this question. Increasing heart rate via pacing to 80 and 100 beats per minute in patients with chronic complete heart block was positively associated with increased myocardial blood flow.
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