Source:http://linkedlifedata.com/resource/umls/id/C0039232
MSH: Abnormally rapid heartbeats caused by reentry of atrial impulse into the dual (fast and slow) pathways of ATRIOVENTRICULAR NODE. The common type involves a blocked atrial impulse in the slow pathway which reenters the fast pathway in a retrograde direction and simultaneously conducts to the atria and the ventricles leading to rapid HEART RATE of 150-250 beats per minute.,NCI: A supraventricular tachycardia due to reentry along a circuit contained within the AV node. AVNRT is the most common form of supraventricular tachycardia and usually presents as a narrow QRS complex tachycardia at a rate between 150 and 250 beats per minute. (NCI),NCI: A supraventricular tachycardia due to reentry along a circuit contained within the AV node. AVNRT is the most common form of supraventricular tachycardia and usually presents as a narrow QRS complex tachycardia at a rate between 150 and 250 beats per minute.