: Incidence, type and clinical significance of cardiac involvement in advanced HIV infection was determined in 32 patients (30 men, two women; mean age 34.2 [21-52] years; mean CD4-cell number 52.2 [0-192]/microliters) over a period of 31 months. Any cardiac involvement was assessed diagnostically by one- and two-dimensional and Doppler echocardiography, complemented by other examinations and results of treatment. 14 patients (43.8%) had abnormal cardiac findings, presumably AIDS-associated. This included left ventricular pump dysfunction of various degrees of severity (n = 11), left ventricular dilatation (n = 2), pericardial effusion (n = 11), as well as cor pulmonale in primary pulmonary arterial hypertension (n = 2). In one patient the first manifestation of AIDS was tubercular pericarditis; in two patients there was a likely connection to disseminated pneumocystis infection and toxoplasmosis, respectively. In 11 patients no specific cause was found for the cardiac involvement. Nine of the 14 patients (64%) had symptoms due to the cardiac involvement. These findings indicate that the incidence and clinical significance of cardiac involvement must be taken into account in any treatment concept for AIDS.