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Left ventricular function in pulmonary atresia with intact ventricular septum after systemic-to-pulmonary arterial shunt

Published online by Cambridge University Press:  19 August 2008

Giuseppe Pacileo
Affiliation:
From the Department of Pediatric Cardiology, University of Naples, Monaldi Hospital, Naples
Carlo Pisacane
Affiliation:
From the Department of Pediatric Cardiology, University of Naples, Monaldi Hospital, Naples
Maria Giovanna Russo
Affiliation:
From the Department of Pediatric Cardiology, University of Naples, Monaldi Hospital, Naples
Raffaele Calabrò*
Affiliation:
From the Department of Pediatric Cardiology, University of Naples, Monaldi Hospital, Naples
*
Dr. Raffaele Calabrò, Via Bracco 71, 80133 Naples, Italy. Fax. (81) 706 2355.

Abstract

To investigate the left ventricular systolic and diastolic function in patients with pulmonary atresia with intact ventricular septum without coronary-cardiac fistulas after a modified Blalock-Taussig shunt, 14 patients (age range 15 days-16.5 months, mean 4.03±5.6 months) and eight control subjects, matched for age, body surface area and heart rate were evaluated by cross-sectional and Doppler echocardiography. The follow-up interval after palliative procedures ranged from 12 days to 16.3 months (mean 3.67±5.6 months). Compared to controls, in the group of patients the ejection fraction was decreased (61±7% vs 68±5%, p=0.022) while the left ventricular end-diastolic volume indexed for body surface area was increased (72.7±10.8 cc/m2 46.1±12 cc/m2 p=0.0001) with normal values of left ventricular mass indexed for body surface area (67.88±20.9 g/m2 vs 76±10 g/m2 p=NS). Mass-to-volume ratio was lower in patients with pulmonary atresia (0.95±0.38 vs 1.24±0.3, p=0.031). The left ventricular shape index was increased in all patients with pulmonary atresia (1.27±0.26 vs 1±0.01, p=0.009). A significant inverse correlation was noted between the ejection fraction and follow-up (r=−0.71, p=0.04). as well as between the ejection fraction and shape index (r=−0.76, p=0.048). Moreover, the patients with pulmonary atresia had decreased E/A velocity ratio (0.65±0.16 vs 1.35±0.90, p=0.009), decreased normalized peak filling rate (4.16±0.13 sv/s vs 6.88±0.68 sv/s, p=0.0001), increased peak A velocity (0.95±0.17 m/s vs 0.51±0.16 m/s, p=0.0001) and prolonged isovolumic relaxation time (46±5.4 ms vs 34±6.2 ms, p=0.0001) and deceleration time (196.4±32.2 ms vs 116±21.4 ms, p=0.0001). There was a good correlation between the normalized peak filling rate and follow-up (r=−0.80, p=0.04). These data show a progressive compromise of the left ventricular systolic and diastolic function in patients with pulmonary atresia with intact ventricular septum without ventriculocoronary fistulas who had undergone systemic-to-pulmonary arterial shunting. Thus, an earlier biventricular or Fontan type procedure should be recommended.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1994

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