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CLINICAL STUDIES

Biventricular repair approach in ducto-dependent neonates with hypoplastic but morphologically normal left ventricle

^a Department of Pediatric Cardiac Surgery, Marie-Lannelongue Hospital; 133 Avenue de la Résistance, 92350, Le Plessis-Robinson, France

Manuscript received February 19, 1998; revised manuscript received September 18, 1998, accepted November 20, 1998.

Reprint requests and correspondence: Dr. Alain Serraf, Marie-Lannelongue Hospital, 133 Avenue de la Résistance, 92350, Le Plessis-Robinson, France
aserraf{at}ccml.com

OBJECTIVES

Increased afterload and multilevel LV obstruction is constant. We assumed that restoration of normal loading conditions by relief of LV obstructions promotes its growth, provided that part of the cardiac output was preoperatively supported by the LV, whatever the echocardiographic indexes.

BACKGROUND

Whether to perform uni- or biventricular repair in ducto dependent neonates with hypoplastic but morphologically normal LV (hypoplastic left heart syndrome classes II & III) remains unanswered. Echocardiographic criteria have been proposed for surgical decision.

METHODS

Twenty ducto dependent neonates presented with this anomaly. All had aortic coarctation associated to multilevel LV obstruction. Preoperative echocardiographic assessment showed: mean EDLVV of 12.4 ± 3.03 ml/m² and mean Rhodes score of –1.73 ± 0.8. Surgery consisted in relief of LV outflow tract obstruction by coarctation repair in all associated to aortic commissurotomy in one and ASD closure in 2.

RESULTS

There were 3 early and 2 late deaths. Failure of biventricular repair and LV growth was obvious in patients with severe anatomic mitral stenosis. The other demonstrated growth of the left heart. At hospital discharge the EDLVV was 19.4 ± 3.12 ml/m² (p = 0.0001) and the Rhodes score was –0.38 ± 1.01 (p = 0.0003). Actuarial survival and freedom from reoperation rates at 5 years were 72.5% and 46%, respectively.

CONCLUSIONS

Biventricular repair can be proposed to ducto dependent neonates with hypoplastic but morphologically normal LV provided that all anatomical causes of LV obstruction can be relieved. Secondary growth of the left heart then occurs; however, the reoperation rate is high.

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