RESUMEN
PURPOSE: To evaluate different patterns of orthostatic hypotension (OH) and its relation to mortality in older patients with unexplained falls or syncope. METHODS: This is an observational cohort study in consecutive patients aged ≥ 65 years with unexplained falls or syncope at a Fall Syncope day clinic November 2011 until May 2016. OH is defined as a decrease in systolic blood pressure (BP) ≥ 20 mmHg and/or in diastolic BP ≥ 10 mmHg during standing test. Main outcomes are the baseline characteristics and prevalence of patients with classical OH (decrease BP until 3 min), delayed OH (decrease of BP from 5 to 10 min) and continuous OH (decrease of BP for 10 min). Secondary outcome is the relation between different OH patterns and mortality. RESULTS: Of 374 patients with a mean age of 80 year (SD 6.6), 56% of the patients had OH: 16% had classical OH, 8% delayed OH, 32% had continuous OH and 44% had no OH. Patients with continuous OH and patients with delayed OH tended to have a higher mortality compared to patients with classical OH, 14 vs. 5% (P = 0.07) and 17 vs. 5% (P = 0.06). This possible relation between OH patterns and mortality could not be confirmed in multivariate analysis. CONCLUSIONS: In these very old patients, there are various patterns of decline in standing BP. Delayed and continuous OH will be missed if BP is measured only for 3 min during standing. This is important because patients with continuous OH and delayed OH might have a relation with mortality. Our results encourage additional studies investigating the relation between different OH patterns and mortality.