A questionnaire-based, multicenter registry of resistant and pseudo-resistant arterial

Hypertensive patients with poor blood pressure (BP) control are commonly referred to tertiary centers with a diagnosis of resistant hypertension (RH). The aim of the study was to identify the causes of insufficient BP control and to assess the incidence of true resistant hypertension.

We ran a questionnaire-based, multicenter study (10 high volume tertiary centers in Poland) of patients referred with an initial diagnosis of RH. Only patients with ABPM-confirmed uncontrolled hypertension (systolic ≥140 mmHg and/or diastolic ≥90mmHg despite maximal doses of ≥3 medications, including a diuretic) were included. We assessed the causes of non-optimal BP control, a proportion of patients with excluded secondary hypertension, and the burden of hypertension-related complications.

We analyzed 124 patients aged 41-88, with a history of hypertension of 17.5±9 years. 90% of them had developed systemic complications, the most common being LV hypertrophy (73.4%) and LV diastolic dysfunction (63.4%). In only 47% all major causes of secondary hypertension were excluded. In 90.3% of subjects, at least one factor affecting BP control was identified. The most frequent factors were medication noncompliance (52.4%), metabolic syndrome (43.6%) excessive sodium intake (66.1%) and chronic administration of non-steroid anti-inflammatory drugs (40%). The incidence of real resistant hypertension was only 4.8%.

Among patients referred with uncontrolled hypertension, the incidence of real resistant hypertension is small. A majority of these patients have multiple factors potentially responsible for poor BP control, the most common being medication non-adherence, use of drugs increasing BP, excessive salt intake and metabolic syndrome.