Resistant hypertension is defined as uncontrolled blood pressure (BP ≥ 140/90mmHg) despite the current use of three or more antihypertensive drugs at full doses, including a diuretic. Obstructive Sleep Apnea (OSA) is at high risk for cardiovascular morbidity and is highly prevalent in patients with resistant hypertension.

The prospective observational POP-ART study will assess the efficacy of continuous positive airway pressure (CPAP) treatment on BP in patients with resistant hypertension and collect data from usual care.

Obstructive Sleep Apnea is highly prevalent in patients with resistant hypertension and several studies have assessed the effect of CPAP treatment on BP.

But only few studies have raised data about the effect of CPAP treatment on BP in patients with resistant hypertension.

Hypertension is moreover associated with increased arterial stiffness, but no data are available in patients with resistant hypertension.

The purpose of this study is to demonstrate that OSA has a major impact in resistant hypertension, whose effects on BP and arterial stiffness can partially be reversible with CPAP treatment.

Inclusion Criteria:

• Patient with resistant hypertension uncontrolled by 3 or more antihypertensive agents
• Patient with severe OSA (apnea-hypopnea index > 30 or > or equal to 15 with excessive daytime sleepiness), or with mild to moderate OSA without excessive daytime sleepiness, or without OSA.
• Ambulatory patient

Exclusion Criteria:

• Body mass index ≥40 kg/m2
• Other identifiable causes of hypertension
• Contraindication to CPAP treatment or patient already treated with CPAP

Patients with resistant hypertension