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ARTICLE |

Anomalous Right Ventricular Muscle Bundles and Ventricular Septal Defect Complicated by Subacute Bacterial Endocarditis

Raul E. Falicov, MD; J. Kevin O'Donoghue, MD; Donald E. Cassels, MD
Arch Intern Med. 1972;130(3):404-407. doi:10.1001/archinte.1972.03650030082019.
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Anomalous right ventricular muscle bundles causing significant obstruction to right ventricular outflow constitute a relatively rare congenital abnormality and have been recognized as a clinical entity only since 1962.1,2 In a recent review, Forster and Humphries3 collected 42 cases from the literature and added 19 cases of their own. The condition most frequently occurs in association with a ventricular septal defect but has been reported in coexistence with various cardiac malformations,4 and rarely as an isolated entity.5

Subacute bacterial endocarditis has been reported in a single case, from Forster and Humphries's series. The present report is concerned with two additional cases, one in a child and another in a young adult, of severe right ventricular obstruction due to anomalous muscle bundles. Both had associated ventricular septal defect, and both developed subacute bacterial endocarditis as their presenting symptom.

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Patient 1.  —This Negro boy was born in

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