الفهرس 
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Abstract
This study included twenty male patients and five control persons classified into three groups as follows :
Group I :
Ten patients with evidence of bilharzial cor pulmonale.
Group II :
Ten patients with schistosomiasis without evidence of cardiac affection. Four patients of each group had active schistosomiasis,
Group III :
Included five patients without evidence of schistosomal infestation.
Other causes of cor pulmonale were excluded in all patients.
All patients were subjected to the following :
1- Thorpugh history and clinical examination.
2- Routine laboratory investigation, 12-lead electro cardiogram
and plain X-ray chest.
3- Electrophysiologic studies including :
a. Measurement of spontaneous cycle length, sinus node recovery time and corrected sinus node recovery time.