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J Thorac Cardiovasc Surg 2005;129:451-452
© 2005 The American Association for Thoracic Surgery
Brief Communications |
a Division of Cardiac Surgery, Congenital Cardiac and Transplantation Unit, American Cardiac Center, American Hospital, Montevideo, Uruguay
b Department of Cardiology, Congenital Cardiac and Transplantation Unit, American Cardiac Center, American Hospital, Montevideo, Uruguay
c Intensive Care Unit, Congenital Cardiac and Transplantation Unit, American Cardiac Center, American Hospital, Montevideo, Uruguay
Received for publication June 7, 2004; accepted for publication June 10, 2004. * Address for reprints: Dante Picarelli, MD, Unidad de Cardiopatías Congénitas y Trasplante, Centro Cardiológico Americano, Sanatorio Americano–Isabelino Bosch 2469, Montevideo 11600 Uruguay (E-mail: picarelli54{at}hotmail.com).
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Cases involving small infants undergoing the Kawashima operation for left atrial isomerism, single ventricle, and azygos continuation of the inferior vena cava are rare and challenging because of the risk associated with this particular circulation, which is similar to a total cavopulmonary shunt, except for the hepatic flow.1
Taking into account the recent encouraging report from Hannan and associates,2 we decided to perform a modified fenestrated Kawashima operation, preserving a limited antegrade flow, in a 5
-month-old infant with severe cyanosis caused by progressive pulmonary stenosis.
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Clinical summary |
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After 5 months, cyanosis progressively increased (oxygen saturation of 70%) because of severe subpulmonary stenosis, with a Doppler gradient of 70 mm Hg confirmed by cardiac catheterization.
To increase the pulmonary artery flow, we decided to perform a fenestrated Kawashima operation, despite the young age of the patient. Intraoperative mean pulmonary artery pressure before the procedure was 14 mm Hg.
A standard bilateral bidirectional cavopulmonary anastomosis was constructed during normothermic cardiopulmonary bypass. The fenestration technique described by Hannan and associates2 (proximal superior vena cava–right pulmonary artery anastomosis, 3 mm in diameter) could not be performed because of the very short proximal segment of the superior vena cava. We decided to construct a 3-mm anastomosis between the apex of the right atrial appendage and the inferior aspect of the right pulmonary artery (Figure 1).
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Early postoperative echocardiography showed effective right-to-left shunt through the fenestration. Minimal inotropic support was required for 3 days. However, moderate superior vena cava syndrome, mild desaturation, and right pleural effusion developed (7 days) as a result of right diaphragmatic paralysis, which was successfully plicated. Ventilatory support was immediately discontinued, and the patient made an uneventful recovery with 88% arterial oxygen saturation.
Twelve months after the operation, the patient was in good condition, with an oxygen saturation ranging from 88% to 90%, and echocardiography revealed a still open fenestration.
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Discussion |
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Despite the increasing risk of early cavopulmonary dysfunction in this age group resulting from smaller pulmonary arteries and a more reactive vascular bed,4 we decided to perform a bilateral bidirectional cavopulmonary anastomosis because of the deleterious effect of the systemic pulmonary shunt in patients with single-ventricle physiology (ventricular overload and pulmonary arterial distortion).5
In an attempt to prevent the development of arteriovenous fistula, which is a risk especially in young infants with heterotaxy syndrome,2,3 we preserved forward flow from the ventricle to maintain the exposure of the pulmonary bed to hepatic flow.
To avoid cavopulmonary dysfunction caused by an additional source of pulmonary blood, we regulated the amount of the antegrade flow with pulmonary banding, maintaining the mean pulmonary artery pressure at less than 16 mm Hg.3 However, in this particular circulation, by adding extrapulmonary blood flow to a subtotal Fontan circulation, the concerns of having pulmonary artery and superior vena caval pressures that are too high are very real.2,3 This is the rationale for decompressing the pulmonary circuit by means of a limited fenestration back into the heart.
The real importance of fenestration in a small infant with this near-total Fontan circulation had been previously reported by Hannan and associates.2 The right-to-left shunt contributed to improved hemodynamic outcome in the early postoperative period.
For anatomic reasons, the original surgical fenestration technique should be modified (Figure 1). The limited anastomosis between the apex of the right atrial appendage and the right pulmonary artery is another valuable option, avoiding the risk of sinus node injury when the proximal superior vena caval stump is too short.
Our modified surgical fenestration successfully provided an effective right-to-left shunt, as demonstrated by the good postoperative hemodynamic course, with minimal inotropic support and no significant pleural effusion, despite the potential deleterious effect of an unfortunate diaphragmatic paralysis.
We believe that the excellent outcome in our patient validates the principle of fenestration in early Kawashima operation coupled with controlled antegrade flow in young infants.
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References |
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This article has been cited by other articles:
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  R. Turkoz, O. Omay, C. Ayabakan, C. Vuran, K. Tokel, I. Gunay, and S. Aslamaci Fenestration Between the Left Atrial Appendage and Left Superior Vena Cava in Kawashima Operation. Ann. Thorac. Surg., December 1, 2008; 86(6): 2000 - 2001. [Abstract] [Full Text] [PDF]
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