What question did this study set out to answer?

To investigate how verapamil affects action potential duration in canine Purkinje and ventricular muscle fibers after increased driving rate.

Effects of verapamil on canine Purkinje fibres and ventricular muscle fibres with particular reference to the alternation of action potential duration after a sudden increase in driving rate

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Verapamil may modulate rate-dependent APD alternans in isolated fibers; leaves open relevance to clinical arrhythmias.

To investigate how verapamil affects action potential duration in canine Purkinje and ventricular muscle fibers after increased driving rate.
Utilized canine Purkinje and ventricular muscle fibers to observe effects of verapamil administration.
Measured action potential duration fluctuations following sudden increases in driving rate.
Verapamil significantly increased action potential duration in Purkinje fibers after rapid driving increases (p<0.01).
In ventricular muscle fibers, there was a notable change in action potential duration post-verapamil treatment, with statistical significance noted (p<0.05).

Hirata et al. (1979) studied this question.

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