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Research ArticleNeurointervention

Patients Requiring Conversion to General Anesthesia during Endovascular Therapy Have Worse Outcomes: A Post Hoc Analysis of Data from the SAGA Collaboration

C.Z. Simonsen, S. Schönenberger, P.L. Hendén, A.J. Yoo, L. Uhlmann, A. Rentzos, J. Bösel, J. Valentin and M. Rasmussen
American Journal of Neuroradiology December 2020, 41 (12) 2298-2302; DOI: https://doi.org/10.3174/ajnr.A6823
C.Z. Simonsen
aFrom the Department of Neurology (C.Z.S.)
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S. Schönenberger
cDepartment of Neurology (S.S.), Heidelberg University Hospital, Heidelberg, Germany
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P.L. Hendén
dDepartment of Anesthesiology and Intensive Care Medicine (P.L.H.)
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A.J. Yoo
fDivision of Neurointervention (A.J.Y.), Texas Stroke Institute, Dallas-Fort Worth, Texas
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L. Uhlmann
gInstitute of Medical Biometry and Informatics (L.U.), University of Heidelberg, Heidelberg, Germany
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A. Rentzos
eRadiology (A.R.), Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital, Gothenburg, Sweden
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J. Bösel
hDepartment of Neurology (J.B.), Klinikum Kassel, Kassel, Germany
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J. Valentin
iDepartment of Clinical Medicine, (J.V.), Danish Center for Clinical Health Services Research, Aalborg University and Aalborg University Hospital, North Denmark Region, Denmark
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M. Rasmussen
bAnesthesia (M.R.), Section of Neuroanesthesia, Aarhus University Hospital, Aarhus, Denmark.
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    FIG 1.

    Grotta bars of the mRS score at 90 days by the 3 groups: the converters and the patients who stayed in the CS group and the GA group. The number in each bar indicates the mRS score. The odds ratio for a shift to a higher (worse) group was 2.67 for the converted group compared with the CS group.

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    FIG 2.

    Receiver operating characteristic (ROC) curve of the final model of the forward selection stepwise regression.

Tables

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    Table 1:

    Reasons for conversion among the 21 patients who were randomized to conscious sedation but converted to general anesthesia

    Reason for conversion (No.)SIESTAANSTROKEGOLIATHTotal
    Severe agitation72312
    Respiratory insufficiency/loss of airway3115
    Direct puncture of the internal carotid artery0404
    • View popup
    Table 2:

    Among the 185 patients allocated to conscious sedation (CS), the 21 converters are compared to the 164 who were treated under CS

    CS as Treated (n = 164)Converted to GA (n = 21)P Value
    Hypertension96 (59%)12 (57%)1.00
    Diabetes28 (17%)5 (24%).54
    Hyperlipidemia72 (44%)3 (14%).009
    Smoker38 (24%)3 (14%).42
    Atrial fibrillation71 (44%)10 (48%).82
    Sex (male)85 (52%)10 (48%).82
    Pre-mRS (≥1)51 (31%)2 (10%).042
    ASPECTS (<6)22 (14%)1 (5%).48
    Left side affected79 (48%)12 (57%).49
    IV thrombolysis given49 (30%)4 (19%).44
    Occlusion type, ICA (neck)12 (7%)0 (0%).36
     ICA-T28 (17%)4 (19%)
     M183 (51%)13 (62%)
     M218 (11%)0 (0%)
     Tandem23 (14%)4 (19%)
    Age (mean) (SD) (yr)71 (14)72 (12).58
    NIHSS score on admission (mean) (SD)17.3 (3.8)17.8 (4.4).27
    Systolic blood pressure start EVT (mmHg), mean (SD)165 (28)161 (25).55
    MABP at start of EVT (mmHg), mean (SD)113 (19)111 (16).62
    • Note:—ICA-T indicates ICA bifurcation; Pre, premorbid.

    • View popup
    Table 3:

    Group mean of mRS at 90-day follow-up, time to groin puncture, and minimum MABP for the 3 groups–the converters, the patients who stayed in the CS group, and the GA group

    Converted from CS to GA (n = 21)Stayed in CS (n = 164)GA Group (n = 183)
    Mean mRS (95% CI)4.3 (3.7–4.9)3.1 (2.8–3.4)2.8 (2.5–3.1)
    Mean rate of successful reperfusion (mTICI 2b–3) (95% CI)71.4 (47.8–88.7)76.2 (69.0–82.5)85.2 (79.3–90.0)
    Mean arrival at angiosuite to groin puncture (95% CI) (min)25.1 (16.3–34.0)17.7 (15.7–19.8)24.0 (21.9–26.2)
    Mean groin puncture to reperfusion (95% CI) (min)90.2 (68.8–111.6)67.2 (59.1–75.3)63.1 (55.7–70.4)
    Mean onset to reperfusion (95% CI) (min)276 (241–312)258 (241–275)273 (256–290)
    Minimum MABP during EVT (95% CI) (mm Hg)68.7 (62.8–74.6)87.8 (85.7–89.9)76.0 (74.0–78.0)
    • Note:—mTICI indicates modified TICI.

    • View popup
    Table 4:

    Incremental predictive value of the 4 best predictors of conversion from conscious sedation to general anesthesiaa

    Incremental AUC (without Data Split)Incremental AUC (Cross-Validated)Univariable AUC (Cross-Validated)
    Hyperlipidemia (95% CI)0.65 (0.56–0.73)0.62 (0.50–0.73)0.62 (0.50–0.73)
    Diabetes (95% CI)0.68 (0.58–0.78)0.66 (0.54–0.78)0.49 (0.36–0.61)
    Pre-mRS (95% CI)0.69 (0.60–0.79)0.67 (0.55–0.79)0.57 (0.45–0.69)
    Age (95% CI)b0.73 (0.62–0.83)0.62 (0.50–0.74)0.38 (0.26–0.50)
    • Note:—Pre indicates premorbid.

    • a Analysis was conducted without data splitting. Each AUC reflects the predictive power of the model consisting of the corresponding variable as well as all above variables.

    • ↵b Not included in the final model.

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American Journal of Neuroradiology: 41 (12)
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C.Z. Simonsen, S. Schönenberger, P.L. Hendén, A.J. Yoo, L. Uhlmann, A. Rentzos, J. Bösel, J. Valentin, M. Rasmussen
Patients Requiring Conversion to General Anesthesia during Endovascular Therapy Have Worse Outcomes: A Post Hoc Analysis of Data from the SAGA Collaboration
American Journal of Neuroradiology Dec 2020, 41 (12) 2298-2302; DOI: 10.3174/ajnr.A6823

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Patients Requiring Conversion to General Anesthesia during Endovascular Therapy Have Worse Outcomes: A Post Hoc Analysis of Data from the SAGA Collaboration
C.Z. Simonsen, S. Schönenberger, P.L. Hendén, A.J. Yoo, L. Uhlmann, A. Rentzos, J. Bösel, J. Valentin, M. Rasmussen
American Journal of Neuroradiology Dec 2020, 41 (12) 2298-2302; DOI: 10.3174/ajnr.A6823
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