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Lung Abscess in Adults with Tetralogy of Fallot and Pulmonary Atresia

Published online by Cambridge University Press:  22 February 2010

Clare P. O’Donnell ,
Michael J. Landzberg  and
Mary P. Mullen
Clare P. O’Donnell
Affiliation:
Department of Cardiology, Children’s Hospital, 300 Longwood Avenue, Boston, MA, 02115
Michael J. Landzberg
Affiliation:
Department of Cardiology, Children’s Hospital, 300 Longwood Avenue, Boston, MA, 02115
Mary P. Mullen*
Affiliation:
Department of Cardiology, Children’s Hospital, 300 Longwood Avenue, Boston, MA, 02115
*
Correspondence to: Mary P. Mullen, MD, PhD, Department of Cardiology, Children’s Hospital, 300 Longwood Avenue, Boston, MA 02115. Tel: 617-355-7866; Fax: 617-713-3808; E-mail: mary.mullen@cardio.chboston.org
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Abstract

We describe 5 adults with tetralogy of Fallot and pulmonary atresia who developed lung abscesses, including some infected with atypical microbial pathogens, with important morbidity. We hypothesize that patients with such anatomy are at risk for chronic pulmonary infection due to hypo-perfusion of the pulmonary parenchyma. This previously unreported clinical association should be considered in the differential diagnosis of patients with tetralogy of Fallot and pulmonary atresia who alter their respiratory state.

Keywords

Adult congenital heart diseasepulmonary atresia and ventricular septal defectpulmonary disease

Information

Type
Brief Reports
Information
Cardiology in the Young , Volume 20 , Issue 1 , February 2010 , pp. 91 - 93
Copyright
Copyright © Cambridge University Press 2010

Tetralogy of Fallot with pulmonary atresia is a congenital cardiac lesion marked by hypoplastic pulmonary arteries fed by flow from a source other than the heart, often through aortic-to-pulmonary collateral arteries. Corrective treatment for patients with this combination, if possible, involves the restoration of continuity from the right ventricle to the pulmonary arteries, and aggressive transcatheter rehabilitation of the pulmonary arteries, including any incorporated collateral vessels.Reference Kreutzer, Perry, Jonas, Mayer, Castaneda and Lock1 Advances in treatment have resulted in improved survival, with many patients now reaching adulthood. This growing cohort of patients mandates increased vigilance for associated complications. In this report, we emphasis the significance of pulmonary abcesses.

Case Reports

We have now encountered 5 adults with tetralogy of Fallot and pulmonary atresia who developed pulmonary abscesses. Unusual pulmonary collateral circulation was noted in 4 of the patients, with 1 patient having experienced prior pulmonary infarction subsequent to a transcatheter interventional procedure. The patients had varied clinical presentations, including hypoxia, cough, haemoptysis, and pleuritic chest pain. We have summarized the clinical features in the Table 1.

Table 1

The clinical findings in our patients with pulmonary abcesses in the setting of tetralogy of Fallot and pulmonary atresia.

* Figure 1a.

†Figure 1b.

‡Figure 1c.

Discussion

We hypothesize that patients with tetralogy of Fallot and pulmonary atresia are at risk for chronic pulmonary infection due to maldevelopment of the pulmonary circulation, and hypoperfusion of the pulmonary parenchyma. The pulmonary vascular abnormalities in patients with tetralogy of Fallot and pulmonary atresia may create an opportunity for chronic colonization and infection by facultative or anaerobic organisms. Hypoplasia or absence of the intrapericardial pulmonary arteries, often with persistence of systemic-to-pulmonary collateral arteries or supply through a patent arterial duct results in dramatically altered pulmonary vascular distribution. In those with collateral arteries, the absence of protective proximal stenosis can trigger focal pulmonary vascular disease, with the propensity for stasis, thrombosis, and haemorrhage. Pulmonary infarction in this setting can result in both aseptic pulmonary cavitation and development of lung abscessesReference Bertoli, Tabares, Casas, Saurit, Caeiro and Alarellos2–Reference Libby, King, LaForce and Schwarz4 This may be similar to the propensity to infection described secondary to micro-infarction in sickle cell anemia.Reference Leggiadro, Dover, Morse and Santosham5

Development of abscesses in the lungs is associated with high rates of morbidity and mortality despite aggressive pharmacologic therapy.Reference Hirshberg, Sklair-Levi, Nir-Paz, Ben Sira, Krivoruk and Kramer6, Reference Mwandumba and Beeching7 Pathogens which are nosocomially acquired, associated with underlying immunocompromise or with pulmonary anatomic defects, are particularly concerning.Reference Mori, Ebe, Takahashi, Isonuma, Ikemoto and Oguri8, Reference Reed9 The impact of chronic cyanosis on immunity has not been well explored, but may play a role in the development of infection in this population. In addition, patients with tetralogy of Fallot and pulmonary atresia are frequently associated with microdeletion of chromosome 22 and DiGeorge syndrome. The clinical aspects of this syndrome can include absence of the thymus, and defects in T cell immunity.Reference Jawad, McDonald-Mcginn, Zackai and Sullivan10 No patients in our series, however, had been genetically screened to establish this combination of features. Chronic malnutrition was problematic, particularly for our second and third patients, although in the third patient the long-lasting infection appeared a contributor rather than a consequence.

From our small cohort, 3 of the patients have now died. Although the development of pulmonary abscesses was only part of their complex clinical picture, the chronicity of infection, and its associated morbidity, highlight the impact of this complication. All 5 patients were managed without aggressive surgical intervention. The pulmonary abscesses in these patients were part of multisystem morbidity, and consideration of surgical therapy mandated weighing risks and benefits of thoracic invasion in the setting of chronic cyanosis, pulmonary vascular disease, abnormalities of lung function, and ventricular dysfunction.

The evolution of pulmonary findings on the computed tomographic scans of the chest is well illustrated by these patients. Scoliosis, cardiomegaly, and pulmonary vascular abnormalities may complicate the interpretation of plain films. Prompt evaluation using computed tomographic imaging, therefore, is recommended whenever the diagnosis of lung abscess is considered (Fig. 1). Bronchoscopy, or needle aspiration guided by computed tomography, may be helpful in identification of pathogens and assist in therapeutic decisions.

Figure 1

The computed axial tomographic scan for our first patient (a) shows a cavitary lesion in the right lower lobe with adjacent calcification. A similar scan in our second patient (b) shows a large left cavitary lesion with anterior parenchymal consolidation, while a scan from our third patient (c) reveals a cavitary lesion of 2 to 3 centimeters in diameter in the left lower lobe.

References

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Figure 0

Table 1 The clinical findings in our patients with pulmonary abcesses in the setting of tetralogy of Fallot and pulmonary atresia.

Figure 1

Figure 1 The computed axial tomographic scan for our first patient (a) shows a cavitary lesion in the right lower lobe with adjacent calcification. A similar scan in our second patient (b) shows a large left cavitary lesion with anterior parenchymal consolidation, while a scan from our third patient (c) reveals a cavitary lesion of 2 to 3 centimeters in diameter in the left lower lobe.