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Cerebrovascular resistance and blood flow velocity changes after carotid endarterectomy
1Department of Neurology, University Hospital of the Saarland, Homburg, Germany. nemmue@med-rz.uni-sb.de
Insights
Cerebral blood flow velocity and resistance increase ipsilateral to carotid endarterectomy (CEA) initially, returning to normal within 3 months. Transcranial Doppler ultrasound (TCD) can identify patients at risk for hyperperfusion syndrome post-CEA.
Area of Science:
- Neuroscience
- Vascular Surgery
- Medical Imaging
Background:
- Carotid endarterectomy (CEA) is a surgical procedure to remove plaque from carotid arteries.
- Understanding hemodynamic changes post-CEA is crucial for patient outcomes.
Purpose of the Study:
- To investigate changes in cerebral blood flow velocity and resistance after carotid endarterectomy.
- To assess the utility of transcranial Doppler ultrasound (TCD) in monitoring these changes.
Main Methods:
- 81 patients undergoing unilateral CEA were studied.
- Transcranial Doppler ultrasound (TCD) measured middle cerebral artery velocities and pulsatility index (PI) preoperatively and postoperatively.
- Data were collected at 6 hours, 7 days, and 3 months after CEA.
Main Results:
- Mean blood velocity in the middle cerebral artery ipsilateral to CEA increased significantly at 6 hours and 7 days post-surgery, returning to baseline by 3 months.
- Pulsatility index (PI) also showed a significant early increase ipsilateral to CEA.
- 11 patients had pathologically high mean blood velocity 6 hours post-CEA, with two developing mild hyperperfusion syndrome.
Conclusions:
- Hemodynamic changes after CEA are most pronounced in the ipsilateral middle cerebral artery.
- Early postoperative TCD monitoring can help identify patients at risk for developing hyperperfusion syndrome.
Background:
To study the pattern of cerebral blood flow velocity and cerebral resistance changes after carotid endarterectomy.
Patients And Methods:
In 81 patients (mean age +/- SD, 64 +/- 8 years) with unilateral carotid endarterectomy (CEA) the systolic, diastolic and mean blood velocities, and the pulsatility index (PI) were recorded in both middle cerebral arteries preoperatively and repetitively postoperatively with the use of transcranial Doppler ultrasound (TCD).
Results:
In the middle cerebral artery ipsilateral to CEA mean blood velocity was increased 6 hours (64 +/- 25 cm/sec; p < 0.005) and 7 days (54 +/- 15 cm/sec; p < 0.05) after CEA and had returned to the preoperative level (49 +/- 11 cm/sec) after 3 months. Compared to preoperatively (0.86 +/- 22), the PI was significantly increased at 6 hours examination (1.03 +/- 23, p < 0.005), and remained increased thereafter. A pathologically increased mean blood velocity (> 83 cm/sec) 6 hours after CEA occurred in 11 patients, two of them developed a slight hyperperfusion syndrome. In the contralateral middle cerebral artery, only the diastolic blood velocity showed significant changes (preoperatively, 35 +/- 12 cm/sec; 3 months after CEA, 33 +/- 8 cm/sec; p < 0.05).
Conclusions:
Using TCD, hemodynamic changes occur predominantly in the middle cerebral arteries ipsilateral to CEA. Early postoperative TCD studies may be of help to identify patients at risk to develop a hyperperfusion syndrome.