Diagnosis of early postoperative carotid artery thrombosis determined by transcranial Doppler scanning Michael E. Gaunt, FRCS Journal of Vascular Surgery

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Presentation transcript:

Diagnosis of early postoperative carotid artery thrombosis determined by transcranial Doppler scanning Michael E. Gaunt, FRCS Journal of Vascular Surgery Volume 20, Issue 6, Pages 1004-1005 (December 1994) DOI: 10.1016/0741-5214(94)90240-2 Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

Fig. 1 TCD printouts show MCA velocity changes at different stages of the operation. Episodes of embolization in postoperative period are indicated by arrows.A, Clamping of common carotid artery. MCA velocity falls from 28 to 17 cm/sec. B, Restoration of flow after endarterectomy. MCA velocity increases to 61 cm/sec. Signals typical of air emboli are seen producing strong signals in lower attenuated channel (arrows). C, and D, Discrete particulate emboli. E, Large particulate embolus cause temporary distortion of MCA waveform and MCA velocity increase 59 to 67 cm/sec. F, Large particulate embolus causing distortion of the MCA waveform. MCA velocity returns to preembolic level over four cardiac cycles. Journal of Vascular Surgery 1994 20, 1004-1005DOI: (10.1016/0741-5214(94)90240-2) Copyright © 1994 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions