The electrocardiographic and hemodynamic analysis were made on 50 patients with patent patient ductus arteriosus which were diagnosed by echocardiography and cardiac catheterization at Dong San Hospital Keimyung University during the period of 4
years
from January 1987 to December 1990.
A total of 50 patients, 17 were male and 33 were female. Their ages ranged form 6 months to 15 years.
The QRS axis were as follows in orders: normal axis(72.0%), right axis deviation(22.0%) and left axis deviation(6.0%).
The large diphasic QRS complex in precordial lead V₁was encounted in 54.0% of the cases.
When the R/S ratio in V₁was more than upper limit of normal, the right ventricular systolic pressure was significantly higher than that of the R/S ratio less than lower limit of normal(P<0.001).
when the R/S ratio in V6 was less than lower limit of normal, the right ventricular systolic pressure was significantly higher than that of the R/S ratio more than upper limit of normal(P<0.001).
When a normal electrocardiographic pattern was present, the right ventricular systolic pressure was normal. When left ventricular hypertrophy pattern was present, the right ventricular systolic pressure was moderately increased but biventricular
and
right ventricular hypertrophy was present, the right ventricular systolic pressure was markedly increased. There was statistically significant relationship between electrocardiographic pattern and right ventricular systolic pressure(P<0.001).
there was a good correlation between the amplitude of S wave in lead V6 right ventricular systolic pressure(r=0.9).
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