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Cardiac isoform of alpha 2 macroglobulin: a marker of cardiac involvement in pediatric HIV and AIDS.

Pediatric Cardiology 2010 Februrary
Cardiac involvement in children with human immunodeficiency virus (HIV)/acquired immune deficiency syndrome (AIDS) is known but less often considered. Our objectives were to determine cardiac manifestations in pediatric HIV/AIDS and estimate the cardiac isoform of alpha-2 macroglobulin [CA2M] among them. We recruited 67 pediatric HIV/AIDS patients, 37 with cardiac involvement (group A) and 30 without (group B); 30 cardiac patients without HIV infection (group C); and 30 healthy control subjects without any comorbid illness (group D). Their sociodemographic and clinical information were collected along with echocardiogram and blood for CA2M. Patterns of cardiac involvement in HIV/AIDS (group A) were pericardial effusion, left ventricular dysfunction, pulmonary hypertension, and cardiomyopathy and observed in 43, 30, 16, and 11% of subjects, respectively. CA2M levels among groups A, B, C, and D were 132.67 +/- 5.01, 41.25 +/- 3.33, 65.99 +/- 2.48 and 29.59 +/- 2.76 microgm/ml, respectively. It was elevated significantly in group A (P = 0.001; 95% confidence interval [CI] 87.27-95.55) compared with group B and was independent of sex and CD4 count among HIV/AIDS subjects. Although CA2M was elevated in HIV-negative patients with cardiac involvement, it was much less than in HIV/AIDS subjects with cardiac involvement (P = 0.001; 95% CI 62.54-70.82). Because CA2M is a cardiac biomarker, further research with larger population is needed to ascertain the role of CA2M as a diagnostic/therapeutic/prognostic marker in cardiac patients with and without HIV infection.

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