Paroxysmal supraventricular tachycardia PSVT is defined as a regular rapid heart beat which initiates and terminates suddenly. Blood tests may be done to rule out specific underlying causes such as hyperthyroidism or electrolyte abnormalities. Paroxysmal Supraventricular Tachycardia Psvt Causes Symptoms Paroxysmal Supraventricular Tachycardia Hakan Oral Fred Morady Supraventricular tachycardias arise in or involve at least some part of the atrium or atrioventricular junction. . The reentry pathway see figure Mechanism of typical reentry in supraventricular tachycardia is within the Atrioventricular AV node about 50 Accessory bypass tract 40 Atria or sinoatrial SA node 10 AV nodal reentrant tachycardia occurs most often in otherwise healthy patients. The cause is not known. Paroxysmal supraventricular tachycardia PSVT is a tachydysrhythmia average heart rate 160220 bpm initiated and sustained by tissue at or above the AV node. ...
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