Abstract
Introduction: Systolic blood pressure (SBP) regulation is the cornerstone of intracerebral hemorrhage (ICH) management, and SBP variability (SBPV) is associated with poor outcomes. We aimed to determine SBPV patterns and associated factors in a prospective cohort of ICH patients. Methods: Primary ICH patients are consented, assessed in-hospital and followed up at 30 and 90 days. All SBP values and BP management details for the hospital stay were collected from electronic medical records. Day and night intervals were defined as 0601 - 2159hrs and 2200 - 0600hrs, respectively. Mean and standard deviation (SD) were calculated for all intervals in each patient. Overall, between and within patient SBPV for day and night was characterized by generalized estimating equation (GEE)-based methods. We identified patients with a high SBPV (HSBPV) and built logistic regression models to determine associated factors. Results: Thus far, 158 patients have been enrolled, with detailed SBP data was available for 126. Total in-hospital follow-up period is 1,446 days [Median (IQR): 8 (4.25 - 15)]. We analyzed 34,740 SBP readings, yielding 3,010 day/night intervals. The in-hospital mean (SD) SBP was 138.2 (15.6) mmHg. GEE-based estimates for mean night SBP were significantly lower compared to day (137.2 v 139.1 mmHg, p < 0.01). Mean SBP SD was 9.1 mmHg between patients while 13.4 mmHg within patients’ individual readings. HSBPV was defined as SD > 13 mmHg. Age and high admission SBP were independently associated with HSBPV after controlling for sex, race, admission NIHSS, ICH score, hemorrhage volume and Nicardipine infusion use (Figure). Enrollments are continuing and updated data with outcomes will be presented. Conclusion: Characterization of patients with HSBPV can help in triage and management decisions based on risk-stratification. Elderly patients may be at a higher risk of SBPV, warranting exploration of possible SBPV contribution to poor outcomes in the elderly.
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