Abstract WP162: Systolic Blood Pressure Night-dipping Influences Functional Recovery in Acute Ischemic Stroke With Severe Cervicocephalic Atherosclerotic Stenosis
Background and Purpose: Systolic blood pressure falling by 10-20% of daytime values during the night constitutes a physiological night-dipping pattern. Blunted (<10%) systolic blood pressure night-dipping (SBPN) is a risk factor of acute ischemic stroke (AIS), but the prognostic value of SBPN for patients with AIS remains unclear. Severe (≥70%) cervicocephalic atherosclerotic stenosis (SCAS), different from the mild or moderate stenosis, renders the cerebral perfusion more vulnerable to variations of blood pressure is prevalent in AIS, and may consequently change the relationship of SBPN with AIS outcomes. We sought to examine the association between SBPN and AIS functional recovery, respectively in patients with and without SCAS. Methods: Patients with AIS within 6 days were consecutively enrolled and divided into SCAS group and non-SCAS group according to whether there was SCAS on CT angiography. SBPN was evaluated by the night-to-day dipping percentage using 24-hour ambulatory blood pressure monitoring on the 6 th day after the symptom onset. A reduction in modified Rankin scale score (mRS) after 3 months compared to mRS at admission was defined as functional recovery. Results: Among 247 AIS patients, 194 (78.5%) had blunted SBPN, and the mean SBPN percentage was 3.12% ± 7.83% (minimal: -24%, median: 3%, maximal: 22%). AIS patients with blunted SBPN were less likely to have the functional recovery than those with normal SBPN (63.9% vs. 81.1%, p=0.018). There was significant interaction between the SBPN percentage and the presence of SCAS for predicting the functional recovery (p=0.026). In AIS patients with SCAS (n=146), rather than in those without (n=101), the SBPN percentage could serve as an indicator of 3-month functional recovery independently of age, sex, National Institute of Health stroke scale score at admission and traditional risk factors (adjusted odd ratio=1.06 for per percent increase of SBPN, 95% confidential interval: 1.01-1.11). Conclusions: Blunted SBPN was frequent among patients with AIS. Adverse effects exerted by lower SBPN on AIS functional recovery were more considerable in patients with SCAS. For AIS patients with SCAS, evaluating SBPN was important to assess their prognosis.