Systolic Blood Pressure and Mortality After Stroke

Does this mean high blood pressure after a stroke is not a concern? Ask your doctor.  I doubt this will influence blood pressure treatment for decades. My intuition tells me that high blood pressure should actually be helpful post-stroke because it would push more oxygenated blood to the damaged neurons. But I obviously know nothing.
http://stroke.ahajournals.org/content/46/5/1307.abstract?etoc

Too Low, No Go?

1. Michelle P. Lin, MD, MPH;
2. Bruce Ovbiagele, MD, MSc, MAS;
3. Daniela Markovic, MS;
4. Amytis Towfighi, MD

+ Author Affiliations

1. From the Department of Neurology, University of Southern California, Los Angeles (M.P.L., A.T.); Department of Neurology, Rancho Los Amigos National Rehabilitation Center, Downey, CA (M.P.L., A.T.); Department of Neurology, Medical University of South Carolina, Charleston (B.O.); and Department of Biomathematics, University of California at Los Angeles (D.M.).

1. Correspondence to Michelle P. Lin, MD, MPH, Department of Neurology, University of Southern California, 1100 N State St A4E, Los Angeles, CA 90033. E-mail michelle.py.lin@gmail.com

Abstract

Background and Purpose—Recent studies suggest a J-shaped association between systolic blood pressure (SBP) and cardiovascular events. The optimal SBP target after stroke remains unknown. We assessed the link between SBP and mortality after stroke.

Methods—We included adults (≥20 years) with self-reported stroke who participated in the National Health and Nutrition Examination Surveys 1998 to 2004, with mortality assessment in 2006. Baseline SBP was categorized as low to normal (<120 mm Hg), normal (120–140 mm Hg), and high (≥140 mm Hg). Independent relationships between baseline SBP and all-cause and vascular mortality were assessed using Cox proportional hazards.

Results—Of 31 126 adult participants, 455 had self-reported stroke and baseline BP readings: 19% had low to normal, 31% had normal, and 50% had high SBP. Two years after assessment, the low to normal SBP group tended to have the highest cumulative all-cause mortality (11.5%), compared with mortality rates of 8.5% and 7.5% in the normal and high SBP groups, respectively. Similar patterns were seen with vascular mortality. After adjusting for covariates, compared with the high SBP group, the low to normal group had higher all-cause mortality (adjusted hazard ratio, 1.96; 95% confidence interval, 1.13–3.39; P=0.017) and trended toward higher vascular mortality (adjusted hazard ratio, 2.08; 95% confidence interval, 0.93–4.68; P=0.075). Compared with the normal BP group, the risk of all-cause and vascular mortality trended higher in low to normal BP group but did not achieve statistical significance.

Conclusions—After stroke, compared with SBP in the high range, low to normal SBP is associated with poorer mortality outcomes.