Question

The following drugs affect heart rate. Go online to find out their mechanism of action and...

The following drugs affect heart rate. Go online to find out their mechanism of action and hypothesize how they affect R-R interval, P-R interval and Q-T interval.

  • Beta-blockers
  • Caffeine

  • Calcium channel blockers
Science   Anatomy-And-Physiology   
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Answer #1

1) BETA BLOCKER'S

RR Interval if the beta blockers increase as a result of slow heart beat and contraction

they have a specific negative dromotropic effect and lengthen PR interval .

QT interval may be shortened ,not compulsory

2) caffine

RR Interval when caffine taken will slightly elevate ,not much significant

PR Interval is not affected

QT Interval does not change

3)Calcium channel blockers

RR Interval is evidently increase as a result of slow contraction and beat

PR Interval become prolonged in Calcium channel blockers intake due to negative dromotropic effect

QT Interval shortened

:)

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