M Opravil, M Pechere, R Speich, HI Joller-Jemelka, R Jenni, EW Russi, B Hirschel and R Luthy
Department of Medicine, University Hospitals of Zurich, Switzerland.

To assess the clinical and echocardiographic time course, prognosis, and possible etiology of HIV-associated primary pulmonary hypertension (PPH), we prospectively followed all 19 patients in whom PPH was diagnosed in our centers. Women (12 cases) and injecting drug use (16 cases) predominated; the median CD4 lymphocytes count was 83/microliter (range, 1 to 740). Matched control subjects without PPH were identified within the Swiss HIV Cohort Study. Frozen serum samples of both groups were then reanalyzed for autoimmune parameters, neopterin, beta-2- microglobulin, and thyroid-stimulating hormone. The median follow up of the patients was 1.3 yr. Follow-up Doppler echocardiography was available in 13 patients. The RVSP-RAP pressure gradient decreased by 3.2 mm Hg for those six patients who received antiretroviral treatment but increased by 19.0 mm Hg for untreated patients (p = 0.026). PPH was the cause of eight of 17 deaths. The probability of surviving was significantly decreased in patients with PPH in comparison with the control subjects; the median survival was 1.3 versus 2.6 yr (p < 0.05). Patients with PPH had significantly higher anticardiolipin IgM, anti SS- B, and neopterin, but all other laboratory values did not differ between cases and control subjects. In conclusion, HIV-associated PPH contributed significantly to mortality. Antiretroviral treatment may exert a beneficial effect on the pressure gradient. A possible role of an autoimmune phenomenon in the pathogenesis could not be substantiated.

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