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Arterial Switch for Pulmonary Venous Obstruction Complicating Mustard

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Arterial Switch for Pulmonary Venous Obstruction Complicating Mustard Ann Thorac Surg CASE REPORT DE JONG ET AL 1005 1995;59:1005-7 ARTERIAL SWITCH AFTER MUSTARD PROCEDURE References Table I. Variables Before Arterial Switch Procedure 1. Mork Jp, Gersony WM. Progressive atrioventricular regurgi- Variable Patient 1 Patient 2 tation in single ventricle. Am J Cardiol 1987;59:658. 2. Yutaka O, Miki S, Kusuhara K, et al. Annuloplastic recon- Weight (kg) struction for common atrioventricular valvular regurgitation Electrocardiogram Biventricular Biventricular in right isomerism. Ann Thorac Surg 1989;47:302-4. hypertrophy hypertrophy Echocardiography Diastolic left 8 (95th 6 (75th ventricular percentile) percentile) posterior wall thickness (ram) Arterial Switch for Pulmonary Shortening fraction 0.30 0.29 Cardiac catheterization Venous Obstruction Complicating Ejection fraction 0.70 0.65 Mustard Procedure Left ventricular 80/5-10 71/1-7 Peter L. de Jong, MD, Ad J. J. C. Bogers, MD, PhD, pressure (mm Hg) Pulmonary artery 69/36 68/39 Maarten Witsenburg, MD, PhD, and Egbert Bos, MD, pressure (ram Hg) PhD Mean capillary wedge 29 30 pressure (mm Hg) Departments of Thoracic Surgery and Pediatric Cardiology, Sophia/Dijkzigt University Hospital, Rotterdam, the Right ventricular 91/0-10 95/1-8 Netherlands pressure (rnm Hg) Left ventricular-to- 0.88 0.75 right ventricular Two patients underwent an arterial switch procedure for ratio the relief of severe pulmonary venous obstruction com- plicating a Mustard procedure. Without preparatory pul- monary banding, both patients had adequate left ventric- symptomatic pulmonary venous obstruction, without the ular function due to secondary pulmonary hypertension. need for preparatory pulmonary artery banding. At 8 and 4 years after the procedure, both patients are in New York Heart Association functional class I, with echocardiographic evidence of good left and right ven- Case Reports tricular function. Patient 1 (Ann Thorac Surg 1995;59:1005-7) This patient underwent a Mustard procedure in 1976 at the age of 6 weeks for the repair of transposition of the urrently, the arterial switch operation is the opera- great arteries with an intact ventricular septum and atrial C tion of choice for transposition of the great arteries septum defect, after unsuccessful balloon atrial septos- [1]. In earlier times, atrial rerouting as in the Mustard tomy. A Mustard procedure with a Teflon baffle was procedure, was performed with good early and medium- performed using hypothermia and circulatory arrest. The term results. However, right ventricular dysfunction may patient was reoperated on twice in the first year of life be troublesome in the long term [2, 3]. The pulmonary because of pulmonary venous obstruction. In the first venous obstruction that can arise after a Mustard proce- reoperation, a dura mater patch was placed. The second dure is a serious complication [1, 41. Elimination of the reoperation involved the use of a Teflon patch. In 1985, obstruction through the placement of a patch carries the obstruction recurred with secondary pulmonary hyper- risk of restenosis. To overcome the risks of recurrent tension. This caused the patient to be in New York Heart pulmonary venous obstruction after atrial repair and the Association functional class IV and ventilator dependent. long-term complications of the atrial switch procedure, Preoperative electrocardiography showed biventricular an arterial switch operation should be considered, espe- hypertrophy. Echocardiography showed dilatation of the pulmonary veins. The size of the left (pulmonary) ventri- cially in patients with secondary pulmonary hyperten- cle was equal to that of the right (systemic) ventricle, with sion due to pulmonary venous obstruction. These pa- the left ventricular posterior wall thickness and shorten- tients may have a well-trained left ventricle that is ing fraction within normal limits for a systemic ventricle. capable of supporting the systemic circulation. Two pa- These findings suggested the existence of severe left tients underwent a single-stage conversion from a Mus- ventricular pressure overload (Table 1). Cardiac catheter- tard construction to an arterial switch for the relief of ization showed a high pulmonary capillary wedge pres- sure, elevated left ventricular and pulmonary arterial Accepted for publication Aug 3, 1994. pressures, and good left ventricular contractility (see Address reprint requests to Dr Bogers, Department of Thoracic Surgery, Table 1). Thoraxcentre, Bd 156, Dijkzigt University Hospital, Dr. Molewaterplein After left femoral artery cannulation and venous can- 40, 3015 GD Rotterdam, the Netherlands. nulation of the right pulmonary artery, because of the © 1995 by The Society of Thoracic Surgeons 0003-4975/95/$9.50 0003-4975(94}00736-Q 1006 CASE REPORT DE JONG ET AL Ann Thorac Surg ARTERIAL SWITCH AFTER MUSTARD PROCEDURE 1995;59:1005-7 inaccessibility of the caval veins, extracorporeal circula- associated with a minimal early mortality at many cen- tion was started. Under conditions of deep hypothermia ters, and the actuarial survival results over the first 10 (16°C) and circulatory arrest, an arterial switch using the years have been excellent. However, late complications Lecompte procedure was performed [5]. After excision of such as rhythm disturbances, right ventricular dysfunc- the Teflon patch placed during the Mustard procedure, tion, tricuspid valve incompetence, and sudden death an atrial septum was reconstructed using a USCI patch have been reported [2, 3, 7]. This possible long-term (C.R. Bard, Billerica, MA). The patient's postoperative outcome after atrial repair is a major argument in favor of course was complicated by a cerebrovascular accident the arterial switch procedure. The arterial switch repair that left her with temporary hemiplegia and pseudobul- can be accomplished with equally good or even better bar paresis. After a long period of rehabilitation, she early results and better intermediate results [1, 8]. This is recovered completely. Eight years later she is in New the basis for considering an arterial switch procedure York Heart Association functional class I. The electrocar- when managing the complications of the atrial switch diogram shows a junctional rhythm, and echocardiogra- operation. Cochrane and associates [2] and Mee [3] phy shows normal left ventricular function, with still described the technique for converting from an atrial some right ventricular hypertrophy and mild aortic in- switch to an arterial switch for the treatment of right sufficiency. ventricular failure. This was done in two stages, with the first stage consisting of banding the pulmonary artery to Patient 2 retrain the left ventricle. Once adequate left ventricular pressure developed, the arterial switch operation was This patient was admitted with persisting cyanosis after performed. birth, and the diagnosis of transposition of the great We describe a one-stage procedure of converting from arteries, an intact ventricular septum, and open ductus an atrial switch to an arterial switch for the treatment of arteriosus was made. A balloon atrial septostomy was pulmonary venous obstruction. Pulmonary venous ob- performed 2 days after birth. In 1985, at the age of 4 struction is a serious complication after a Mustard atrial months, the infant underwent a Mustard procedure un- switch [1, 4]. Repair using a patch may result in resteno- der circulatory arrest and hypothermia that involved the sis, as illustrated by patient 1. The pulmonary venous use of a Teflon baffle. In 1988 exertional dyspnea with a obstruction with secondary pulmonary hypertension period of pneumonia occurred. Echocardiography re- may cause the left ventricle to be well trained and thus vealed distended pulmonary veins and severe narrowing able to support the systemic circulation without the need of the communication to the pulmonary venous atrium. for preparatory pulmonary artery banding, as was shown The size of the left ventricle was almost equal to that of in both our patients (see Table 1). Echocardiography the right, and both the shortening fraction and the left appeared to be a very valuable tool in the selection of ventricular posterior wall thickness were within the nor- candidates for the one-stage approach. After a successful mal limits for a systemic ventricle (see Table 1). Cardiac atrial repair for transposition of the great arteries, the left catheterization showed pulmonary venous obstruction ventricle is flattened due to its low systemic pressure. with elevated left ventricular and pulmonary arterial Echocardiography showed that, in both our patients, the pressures due to secondary pulmonary hypertension. left and right ventricular volumes were comparable. Left Left ventricular contractility was good (see Table 1). ventricular posterior wall thickness had increased to Subsequently, an arterial switch was performed. With within normal limits for a systemic ventricle. The left the patient on extracorporeal circulation and under con- ventricular posterior wall shortening fraction was in the ditions of hypothermia (20°C) and cardioplegic arrest, an lower normal range. However, we believe that the deci- arterial switch procedure was done. The Teflon baffle was sion to perform a one-stage repair in this setting can only excised and the atrial septum was reconstructed with a be made adequately with invasively obtained hemody- Gore-Tex patch (W. L. Gore, Elkton, MD). namic data, using as the cutoff a minimal left ventricular- The patient had an uneventful postoperative course, to-right ventricular
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