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Congenital complete heart block is a rare occurrence. In some cases, it remains asymptomatic until adulthood or in the case of women until pregnancy. It is usually secondary to placental transfer of maternal antibodies and is associated with high mortality and morbidity. We present a case of a parturient who presented in active labor with premature rupture of membranes and decreased fetal movements. We found that the patient had a complete heart block with mild effort intolerance on evaluation. Markers for metabolic and ischemic causes were negative, and we made a provisional diagnosis of congenital complete heart block. The patient underwent a lower section cesarian section under spinal anesthesia with temporary pacemaker backup. Postoperatively, the patient underwent permanent pacemaker implantation. This case report underlines the importance of standard American Society of Anesthesiologists (ASA) monitoring, including a 12-lead electrocardiogram (ECG), which could prove decisive and life-saving in dire circumstances.