The relaxant effect of nifedipine in human uterine smooth muscle and the BKCa channel

This study demonstrates that the uterorelaxant effect of nifedipine is attenuated by potassium channel (K+) blockade. This suggests that K+ channel conductance, and particularly the BKCa channel, plays a role in the potent relaxant effect of nifedipine, hitherto presumed to act solely through L-gated calcium channels.