<prompt> Prinzmetal angina is -Angina after extreme exeionCaused due to atherosclerotic blockadeCaused due to spasm of aeryCalcium channel blockers not effective  <response>: Ref: R. Alagappan Manual of Practical Medicine. 4th Edition pg no:79 Prinzmetal Angina Prinzmetal angina is a type of angina pectoris, which typically occurs during rest and may recur in a nightly cyclic pattern. ST-segment elevation or depression on the electrocardiogram and coronary aery spasm have been documented during an attack. 