Usefulness of Transcranial Doppler-Derived Cerebral Hemodynamic Parameters in the Noninvasive Assessment of Intracranial Pressure

作者：Wakerley Benjamin R^*; Kusuma Yohanna; Yeo Leonard L L; Liang Shen; Kumar Komal; Sharma Arvind K; Sharma Vijay K

来源：Journal of Neuroimaging, 2015, 25(1): 111-116.

DOI：10.1111/jon.12100

• Transcranial Doppler
• pulsatility index
• resistance index
• intracranial pressure

BACKGROUND
Transcranial Doppler (TCD) ultrasonography is a noninvasive bedside tool that can evaluate cerebral blood flow hemodynamics in major intracranial arteries. TCD-derived pulsatility index (PI) is believed to be influenced by intracranial pressure (ICP).
OBJECTIVE
To correlate TCD-PI with cerebrospinal fluid (CSF) pressure (representing ICP), measured by standard lumbar puncture (LP) manometry.
METHODS
CSF pressures (CSF-P) were measured in 78 patients by LP manometry. Stable TCD spectra were obtained 5 minutes before LP from either middle cerebral arteries using Spencer's head frame and 2-MHz transducer. PI values were calculated from the TCD spectra by an independent neurosonologist.
RESULTS
Factors displaying a significant relationship with CSF-P included age (R = -.426, P < .0005); EDV (R = -.328, P = .002;) and PI (R = .650, P < .0005). On analyzing dichotomized data (CSF-P < 20 vs. >= 20 cm H2O) TCD-PI was an independent determinant (OR per .1 increase in PI = 2.437; 95% CI, 1.573-3.777; P < .0005). PI >= 1.26 could reliably predict CSF-P >= 20 cm H2O (sensitivity, specificity, positive predictive value, negative predictive value, and overall accuracy were 81.1%, 96.3%, 93.8%, 88.1%, and 90.1% respectively).
CONCLUSION
TCD-derived PI could be used to identify patients with CSF-P >= 20 cm H2O and may play an important role as a monitoring tool.

• 出版日期2015-2