Northerncardinal

2+ Year Member
May 25, 2016
126
39
Status
Medical Student
a question in uworld mentions that verapamil raises the threshold potential of cardiac slow response fibers. how does it affect threshold potential?
 

Ven0m

boop
2+ Year Member
Jun 11, 2015
172
34
Calgary
Status
Medical Student
weird. because i know if a patient has hyperkalemia, which decreases the threshold potential (indirectly), then you give calcium gluconate to raise the threshold potential, countering the effects of hyperkalemia. but since verapamil is a ca2+ blocker, i would think it has the opposite effect. any ideas?