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A-V interval |
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A-V interval Etymology: L, intervallum, space between ramparts the time between an atrial polarization and the next ventricular polarization. In a surface electrocardiogram, the A-V interval is the time between the beginning of the P wave and the beginning of the QRS complex. A normal interval is less than 200 msec. In His bundle electrograms (HBEs), the A-V interval is the time between the A wave and the V deflection. The A wave is the first deflection on the HBE and represents low right atrial activation. The V deflection is the last deflection on the HBE and represents ventricular activation; it is concurrent with the QRS complex on a surface electrocardiogram. Prolongation of this interval is known as first-degree heart block. A-V interval Cardiac pacing The length of time in a dual-chamber pacemaker between an sensed or paced atrial event and a paced ventricular event. See Pacemaker. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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