Abstract
Objectives
To examine the accuracy of transcranial Doppler to detect cerebral vasospasm in a patient population with aneurysmal subarachnoid hemorrhage.
Design
Prospective blind comparison of transcranial Doppler with cerebral angiography. Diagnostic accuracy of transcranial Doppler was assessed using receiver operating characteristic (ROC) analysis and likelihood ratios. Sensitivity and specificity were calculated using directly measured middle cerebral artery diameter as reference standard.
Setting
Intensive Care Unit of a large university teaching hospital.
Patients and participants
Twenty-two patients with subarachnoid hemorrhage were included. Patients underwent angiography on admission and after 8 days to diagnose vasospasm and were defined as having clinical vasospasm, angiographic vasospasm, or no vasospasm.
Measurements and results
Sensitivity and specificity were 1.00 and 0.75 for angiographic vasospasm and both equal to 1.00 for clinical vasospasm diagnosis. A transcranial Doppler mean velocity threshold value of 100 cm/s for angiographic vasospasm and 160 cm/s for clinical vasospasm detection were chosen by ROC analysis.
Conclusions
A Transcranial Doppler mean velocity threshold of 160 cm/s, calculated by the ROC analysis, accurately detects clinical vasospasm. A daily transcranial Doppler examination performed by a trained operator should be routinely used to provide early identification of patients at high risk and to orient therapeutic decisions.
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Acknowledgments
The authors thank DWL, Elektronische Systeme, Supplingen, Germany for kindly supplying the Doppler equipment, and Foundation Baxter and Alma Ricard Chair in cerebrovascular surgery, University of Toronto for supporting the study.
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Dr L. Mascia was supported by the PhD program in Applied Physiology, University of Turin, Italy.
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Mascia, L., Fedorko, L., terBrugge, K. et al. The accuracy of transcranial Doppler to detect vasospasm in patients with aneurysmal subarachnoid hemorrhage. Intensive Care Med 29, 1088–1094 (2003). https://doi.org/10.1007/s00134-003-1780-5
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DOI: https://doi.org/10.1007/s00134-003-1780-5