It was learned in 1960 that pregnancy could cause respiratory and circulatory changes, and that severe labor pain could cause tachycardia and cardiac arrythmias. We have experienced successful anesthetic management for cessarean section of a full term pregnant woman with multiple premature ventricular contractions under spinal anesthesia. PVC's could be caused by systemic hyposia, hypokalemia, acidosis hypercapnia, hypocalcemia, regional myocardial ischemia, etc. We could not confirm the cause of this woman's PVCs, but we assume that either deterioration of the respiratory and cardiac changes or severe labor pain could be implicated.