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. 2015 Apr;34(4):503-8.
doi: 10.1016/j.healun.2014.09.042. Epub 2014 Oct 23.

Systolic blood pressure on discharge after left ventricular assist device insertion is associated with subsequent stroke

Michael E Nassif  1 , Anjan Tibrewala  2 , David S Raymer  1 , Adam Andruska  2 , Eric Novak  1 , Justin M Vader  1 , Akinobu Itoh  3 , Scott C Silvestry  3 , Gregory A Ewald  1 , Shane J LaRue  4
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Systolic blood pressure on discharge after left ventricular assist device insertion is associated with subsequent stroke

Michael E Nassif et al. J Heart Lung Transplant. 2015 Apr.

Abstract

Background: Stroke is a significant complication in patients supported with continuous-flow left ventricular assist devices (CF-LVAD) and hypertension is a significant risk factor for stroke, but the association between blood pressure and stroke in LVAD patients is not well characterized.

Methods: We identified 275 consecutive patients who survived implant hospitalization between January 2005 and April 2013. Patients were grouped according to systolic blood pressure (SBP) as above a median and below a median of 100 mm Hg by their averaged systolic blood pressure during the 48 hours before discharge from implantation hospitalization. The groups were compared for the primary outcome of time to stroke.

Results: The above-median SBP group had mean SBP of 110 mm Hg and the below-median SBP group had mean SBP of 95 mm Hg. There were no significant between-group differences in body mass index, smoking, vascular disease, hypertension, atrial fibrillation, or prior stroke. During a mean follow-up of 16 months, stroke occurred in 16% of the above-median SBP group vs in 7% of the below-median SBP group (hazard ratio, 2.38; 95% confidence interval, 1.11-5.11), with a similar proportion of hemorrhagic and ischemic strokes in each group. In Cox proportional hazard models adjusting for age, diabetes, or prior stroke, the hazard ratio remained statistically significant. SBP as a continuous variable predictor of stroke had an area under the curve of 0.64 in a receiver operating characteristic curve analysis.

Conclusions: In this large, CF-LVAD cohort, elevated SBP was independently associated with a greater risk of subsequent stroke. These results identify management of hypertension as a potential modifiable risk factor for reducing the incidence of stroke in patients supported by CF-LVAD.

Keywords: continuous flow; hypertension; left ventricular assist device; stroke; systolic blood pressure.

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Figures

Figure 1
Figure 1. Histogram of Systolic Blood Pressures for below and above median blood pressure groups
Figure 2
Figure 2. Kaplan-Meier analysis of freedom from stroke between below and above median systolic blood pressure groups
Figure 3
Figure 3. Receiver Operating Characteristic (ROC) analysis of SBP as a predictor of stroke
See this image and copyright information in PMC

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References

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