CPAP in SAHS Patients With Hypertension

Inclusion Criteria: * Recent diagnosis of sleep apnea-hypopnea syndrome with an apnea-hypopnea index (AHI) \> 10 h-1 * No previous treatment for SAHS or hypertension * Diagnosis by 24-h ambulatory monitoring of blood pressure (AMBP) of isolated nocturnal hypertension (nighttime blood pressure of ≥120 mm Hg systolic or 70 mm Hg diastolic and a daytime blood pressure \<135/85 mm Hg) or day-night sustained hypertension (nighttime blood pressure of ≥120 mm Hg or 70 mm Hg diastolic and a daytime blood pressure of ≥135 mm Hg systolic). Exclusion Criteria: * Severe hypertension (\> 180/120 mmHg). * Previous diagnosis of secondary hypertension. * Myocardial infarction or stroke in the last three months. * Severe diurnal sleepiness (Epworth score \> 15) * Previous diagnosis of chronic obstructive pulmonary disease, asthma, bronchiectasis, lung cancer, restrictive lung disease, chest wall disease or thoracic surgery. * Previous diagnosis or clinical evidence of heart disease, neuromuscular disease or thyroid dysfunction. * Morbid obesity (BMI \> 40 Kg/m2) * Respiratory infection in the last two months. * Treatment with theophylline or systemic corticosteroids in the last two years. * Excessive alcohol intake (\>40 g/day) * Absence of social or familiar support.