Electronic evaluation of fetal heart rate. XI. Description of a spiral electrode.
D004562:Electrocardiography / Q000295:instrumentation*; D004566:Electrodes; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation; D011247:Pregnancy