The difference between the patients' initial and previously measured systolic blood pressure as predictor of mortality in older emergency department patients.

Abstract

To assess how often baseline systolic blood pressure (SBP) could be retrieved from the Electronic Health Record (EHR) in older Emergency Department (ED) patients. Second, to assess whether the difference between baseline SBP and initial SBP in the ED (ΔSBP) was associated with 30-daymortality. A multicenter hypothesis-generating cohort study including patients ≥ 70years. EHRs were searched for baseline SBPs. The association between ΔSBP and 30-day mortality was investigated. Baseline SBP was found in 220 out of 300 patients (73.3%; 95%CI 68.1-78.0%). In 72 patients with normal initial SBPs (133-166mmHg) in the ED, fifteen (20.8%) had a negative ΔSBP with 20.0% mortality. A negative ΔSBP was associated with 30-day mortality (AHR 4.7; 1.7-12.7). Baseline SBPs are often available in older ED patients. The ΔSBP has prognostic value and could be used as an extra variable to recognize hypotensionin older EDpatients. Future studies should clarify whether the ΔSBP improves risk stratification in the ED.