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Observational Study
. 2021 Jan 12;96(2):e171-e181.
doi: 10.1212/WNL.0000000000011006. Epub 2020 Oct 7.

Blood Pressure During Endovascular Treatment Under Conscious Sedation or Local Anesthesia

Collaborators, Affiliations
Observational Study

Blood Pressure During Endovascular Treatment Under Conscious Sedation or Local Anesthesia

Noor Samuels et al. Neurology. .

Abstract

Objective: To evaluate the role of blood pressure (BP) as mediator of the effect of conscious sedation (CS) compared to local anesthesia (LA) on functional outcome after endovascular treatment (EVT).

Methods: Patients treated in the Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands (MR CLEAN) Registry centers with CS or LA as preferred anesthetic approach during EVT for ischemic stroke were analyzed. First, we evaluated the effect of CS on area under the threshold (AUT), relative difference between baseline and lowest procedural mean arterial pressure (∆LMAP), and procedural BP trend, compared to LA. Second, we assessed the association between BP and functional outcome (modified Rankin Scale [mRS]) with multivariable regression. Lastly, we evaluated whether BP explained the effect of CS on mRS.

Results: In 440 patients with available BP data, patients treated under CS (n = 262) had larger AUTs (median 228 vs 23 mm Hg*min), larger ∆LMAP (median 16% vs 6%), and a more negative BP trend (-0.22 vs -0.08 mm Hg/min) compared to LA (n = 178). Larger ∆LMAP and AUTs were associated with worse mRS (adjusted common odds ratio [acOR] per 10% drop 0.87, 95% confidence interval [CI] 0.78-0.97, and acOR per 300 mm Hg*min 0.89, 95% CI 0.82-0.97). Patients treated under CS had worse mRS compared to LA (acOR 0.59, 95% CI 0.40-0.87) and this association remained when adjusting for ∆LMAP and AUT (acOR 0.62, 95% CI 0.42-0.92).

Conclusions: Large BP drops are associated with worse functional outcome. However, BP drops do not explain the worse outcomes in the CS group.

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Figures

Figure 1
Figure 1. Schematic Illustration of Procedural Blood Pressure Measures
1. Mean arterial pressure (MAP) value on admission. 2. Lowest MAP. 3. Area under the threshold. 4. Relative difference between baseline MAP and lowest MAP (∆LMAP). 5. Average trend (slope). ED = emergency department; EVT = endovascular treatment.
Figure 2
Figure 2. Flowchart of Patient Selection
CS = conscious sedation; EVT = endovascular treatment; GA = general anesthesia; LA = local anesthesia; MR CLEAN = Multicenter Randomized Clinical Trial of Endovascular Treatment for Acute Ischemic Stroke in the Netherlands.
Figure 3
Figure 3. Procedural Blood Pressure (BP) for Patients Treated Under Conscious Sedation or Local Anesthesia
(A) Nonsmoothed mean systolic BP curves for both anesthetic modalities with 95% tolerance interval (band). (B) Smoothed mean systolic BP curves during EVT procedure for both anesthetic modalities (continuous line) with 95% tolerance interval (dotted line).
Figure 4
Figure 4. Primary Outcome on the Modified Rankin Scale (mRS) by Preferred Anesthetic Method

References

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