[Electrovectorcardiographic manifestations of supraventricular ectopic rhythms (an interpretive hypothesis)].
When a low right atrial rhythm is present, P waves are negative in the low leads, they are variable in a VR and positive in a VL and LI. The figure eighth PF loop is located in the first quadrant, the PH loop has a counterclockwise rotation, and the PS can rotate in either direction. In the presence of upper left atrial rhythms, P waves are positive in the low leads and negative in a VL and a VR. The PF and PH loops can be found in the third quadrant of both planes with a clockwise rotation. If the rhythm originates in low left atrial regions, negative P waves are recorded in left precordial leads and positive ones in a VR and a VL. The PF loop has counterclockwise rotation or its branches superimposed and is situated in the second quadrant; PH with clockwise rotation is registered in the third quadrant; PS with either counterclockwise or clockwise rotation develops above and slightly ahead of the E point. When a nodal rhythm exists, P waves are negative in the low leads. The P loops show a counterclockwise rotation or a figure eight morphology. In the absence of atrial enlargements, the PF loop can be recorded in the first quadrant and the PH in the first or the fourth quadrant.
de Micheli
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A
Departamento de Electrocardiografía y Vectocardiografía, Instituto Nacional de Cardiología Ignacio Chávez, México, D.F.
Medrano
G A
GA
D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D004562:Electrocardiography; D006801:Humans; D013617:Tachycardia, Supraventricular / Q000145:classification / Q000503:physiopathology*; D014672:Vectorcardiography
Manifestaciones electrovectocardiográficas de los ritmos ectópicos supraventriculares. (Una hipótesis interpretativa).