The significance of posttraumatic increase in cerebral blood flow velocity: a transcranial Doppler ultrasound study.

Abstract:

:Using transcranial doppler ultrasonography, cerebral blood flow velocity was measured daily from both middle cerebral arteries in 121 patients who had suffered minor (n = 55), moderate (n = 16), or severe (n = 50) brain injury. Serial computed tomographic scans were performed to identify noncontusion-related infarction (NCI). Cerebral perfusion pressure was monitored continuously in 41 patients who had severe head injury; of these, 22 had continuous measurement of arterial and jugular bulb venous oxygen (SJO2) saturation. Abnormally high mean flow velocity (greater than 100 cm/s) was observed in 23 patients (minor injury, n = 3; moderate injury, n = 3; severe injury, n = 17), but was recorded only when cerebral perfusion pressure exceeded 60 mm Hg (P less than 0.0001). Fourteen patients who underwent SJO2 monitoring developed increased mean flow velocity (MFV). In 6, the arterial-jugular venous oxygen content difference (AVDO2) was below 4 ml/dl, indicating global cerebral hyperemia. All had bilateral elevation of MFV, and 6 of the 8 nonhyperemic patients (AVDO2, 4-9 ml/dl) had a unilateral increase of MFV (P = 0.018). Four of the 23 patients with increased MFV developed NCI, as compared with none of the patients without elevated MFV (P = 0.015). All patients with NCI had suffered severe brain injury, had unilateral elevation of MFV in the terriory of the relevant cerebral vessel, and had received therapy to correct reduced cerebral perfusion pressure (P = 0.008). NCI did not occur in any patient with increased MFV that was associated with global hyperemia.

journal_name

Neurosurgery

journal_title

Neurosurgery

authors

Chan KH,Dearden NM,Miller JD

keywords:

subject

Has Abstract

pub_date

1992-05-01 00:00:00

pages

697-700

issue

5

eissn

0148-396X

issn

1524-4040

journal_volume

30

pub_type

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