Atrial pacing identified a tension-time index threshold above which angina occurs, with exceptions in some patients explained by an abnormal increase in heart size at higher heart rates.
Can atrial pacing be used to measure the tension-time index threshold for angina in patients with angina pectoris?
Atrial pacing is a novel technique that can identify a tension-time index threshold for the onset of angina pectoris.
A threshold level of tension-time index has been found in patients with angina pectoris above which angina occurred. End-diastolic x-ray films showing an increase, rather than the usual decrease, in heart size with increasing rate were thought to explain the absence of a threshold level in some patients.
Sowton et al. (1967) studied this question. Atrial pacing identified a tension-time index threshold above which angina occurs, with exceptions in some patients explained by an abnormal increase in heart size at higher heart rates.
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