P wave duration and amplitude in the standard limb lead II and P wave terminal force (P
tf) in the chest lead V
1 were measured before and after pacemaker implantation in the patient with atrioventricular (A-V) block and sick sinus syndrome.
P
II amplitude and negativity of P
tf were observed to be increased in the patient with A-V block. There was found a significant relationship between P
tf and cardiothoracic ratio (CTR) in the chest X ray of the patient with A-V block. After the implantation of pacemaker, negativity of P
tf in the patient with A-V block decreased.
From these findings, it can be said that the patient with A-V block had atrial overload due to hemodynamical restriction partly as the result of low heart rate and physiologically abnormal correlation of atrial and ventricular contraction, and that it was improved after pacemaker implantation.
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