To evaluate the prevalence of lipodystrophy syndrome in patients receiving currently available antiretroviral drugs, and the prevalence of associated metabolic syndrome in HIV-infected patients with a previous diagnosis of lipodystrophy syndrome, according to the severity of fat accumulation and antiretroviral drug use.

Cross-sectional evaluation of two groups of patients:

• patients receiving currently available drugs, in order to determine the changes in fat accumulation by successive dual X-ray absorptiometry (DXA) determinations
• patients with previous lipodystrophy syndrome, as evaluated by questionnaire (HOPS) and total body dual X-ray absorptiometry (DXA), in order to determine the prevalence of hypertension, low high density lipoprotein (HDL)-cholesterol, glucose disturbance (insulin resistance or diabetes), fat accumulation (waist circumference) and hypertriglyceridemia.

The prevalence of Metabolic syndrome will be evaluated according to the different definitions (IDF, NCEP-ATP III, WHO).

Inclusion Criteria:

• HIV infection
• Older than 18 years
• Receiving first or second antiretroviral regimen or
• Previous evaluation and classification of lipodystrophy syndrome

Exclusion Criteria:

• Pregnancy
• Diagnosis of hypothyroidism, Cushing's syndrome or prolonged intake of corticosteroids or hormones before inclusion
• Patients who had received antiretroviral drugs known to produce fat disturbances (for lipodystrophy prevalence objective)

HIV-infected patients on antiretroviral therapy with current drugs (excluding drugs previously associated with fat disturbance), and HIV-infected patients with previous evaluation of lipodystrophy syndrome in different severity, as determined by DXA and questionnaire.