Step I Digoxin effect on ECG

[aspiringmd1015]

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how does digoxin shorten QT interval and decrease Action potenial duration?

 

[AZ7]

Where did you come across it shortening QT interval and AP duration?
Since it leads to hyperkalemia, id think it would in fact prolong QT interval (lesser gradient for the outward K efflux during phase III).

 

[aspiringmd1015]

UW question explanation.

 

[ftp902]

My understanding is that Digoxin increases contractility which shortens QT interval for its ventricular contraction. PR interval increases however, due to vagal input of digoxin at the AV node.

 

[aspiringmd1015]

qt interval is mostly associated with repolarization, not depolarization ie contraction.