Electrocardiographic features of atrial depolarization during pacing of right atrial appendage.
Indian Heart J
;
1991 Mar-Apr; 43(2): 79-82
Article
in English
| IMSEAR
| ID: sea-3487
ABSTRACT
Identification of atrial capture during pacing from right atrial appendage is frequently difficult. Electrocardiograms of forty five patients implanted with AAI/DDD pacemakers (thirty unipolar, fifteen bipolar) were analysed to characterize the specific morphology of paced P waves. Compared to sinus P waves, atrial pacing resulted in atrial depolarization of lower amplitude (0.16 +/- 0.05 mv vs 0.11 +/- 0.032 mv, P less than 0.005) but increased duration (0.07 +/- 0.009 sec vs 0.08 +/- 0.017 sec, P less than 0.005). P wave morphology was similar in unipolar and bipolar pacing units. It was positive in lead I (80%), II (71.11%), III (80%) and aVF (75.55%). In lead aVL, paced P waves were usually diphasic with an initial negative deflection (35.55%). Precordial leads showed paced atrial depolarization of small amplitude and did not help in identification of atrial capture. In unipolar pacing P waves were best seen in lead III because of small pacing spike in this lead. Lead II was suitable for identification of paced P waves in bipolar pacing. Thus careful examination of standard ECG leads for paced P waves of low amplitude, prolonged duration and specific morphology can help in confirming atrial capture following pacing stimulus from right atrial appendage.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Pacemaker, Artificial
/
Atrioventricular Node
/
Sick Sinus Syndrome
/
Sinoatrial Node
/
Aged
/
Female
/
Humans
/
Male
/
Cardiac Pacing, Artificial
/
Atrial Function, Right
Language:
English
Journal:
Indian heart j
Year:
1991
Type:
Article
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