cardiovascular disorders
Reentrant Supraventricular Tachycardias (SVT) Including Wolff Parkinson White Syndrome
Diagnosis of Reentrant SVTs
Electrocardiography (ECG) Diagnosis of supraventricular tachycardia is by Electrocardiography showing rapid, regular tachycardia. Previous tracings, if available, are reviewed for P waves vary. In most cases of AV node reentry, retrograde P waves are in the terminal portion of the QRS complex (often producing a pseudo-R′deflection in lead V1); about one third occur just after the QRS complex, and very few occur before. P waves always follow the QRS complex in orthodromic reciprocating tachycardia of WPW syndrome. and figures Classic Wolff-Parkinson-White (WPW) syndrome and Although most supraventricular tachycardias have a narrow QRS complex, some have a wide QRS complex and must be distinguished from ventricular tachycardia. Activation is as follows: atrioventricular node, His-Purkinje system, ventricle, accessory pathway, atria. The P wave closely follows the QRS complex; it is a short RP interval tachycardia (PR>RP). 