Correlation Between Serum Uric Acid and Pulmonary Hypertension in Obstructive Sleep Apnea Syndrome

Inclusion Criteria: * Clinical diagnosis of OSAHS by overnight polysomnography (AHI ≥ 5/ hr) * ≥18 years old. Exclusion Criteria: * Other sleep disorders as narcolepsy or hypersomnia were excluded as well as Patients with neuropsychiatric disorders. * Hemodynamically unstable patients * Patients with other chronic respiratory or cardiac diseases * Patients with other known causes of pulmonary hypertension * Patients with any disease or on medication that could alter excretion or urinary metabolism of uric acid such as Excessive uric acid production