Risk Factors of Postprocedural Hypotension following Carotid Artery Stenting

This study is performed to investigate risk factors of hypotension in response to elective carotid stenting. Forty-four lesions of 40 consecutive patients (mean age 70.4 ± 8.2 years) were retrospectively analyzed. Easy Wall stent was applied in 15 lesions and SMART stent in 29 lesions. We investigated correlations between the occurrence rate of postoperative hypotension below 90 mmHg and persisting over three hours and findings of preoperative angiograms, ultrasonograms and clinical characteristics. Postprocedural hypotension occurred in 19 patients (47.5%) and medical treatment (intravenous administration of catecholamines) was required in eleven patients (27.5%). Although there was no permanent neurological deficits related with postprocedural hypotension, transient neurological deficits were found in three patients. Risk factors of prolonged postprocedural hypotension were statistically analyzed. On angiographic characteristics; 1) distance between the carotid bifurcation and the lesion with maximum stenosis (≦10 mm vs. >10 mm: p = 0.031), 2) type of stenosis (eccentric vs. concentric: p = 0.014) On ultrasonographic characteristics; 1) calcifications at the carotid bifurcation (present vs. absent: p<0.001). Other variables, including age and degree of stenosis, were not associated with postprocedural hypotension after carotid stenting. These angiographic and ultrasonographic variables can be used to identify patients at risk for postprocedural hypotension after carotid stenting. Such identification may help in selection of patients who will benefit from appropriate pharmacological treatment.