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Titolo:
Identification of echocardiographic "smoke" in a bench model with transcranial Doppler ultrasound
Autore:
Yang, Y; Grosset, DG; Li, Q; Lees, KR;
Indirizzi:
Univ Alberta, Cerebrovasc Lab, HMRC, Dept Med,Neurol Div, Edmonton, AB T6G2S2, Canada Univ Alberta Edmonton AB Canada T6G 2S2 Div, Edmonton, AB T6G2S2, Canada So Gen Hosp, Dept Neurol, Glasgow G51 4TF, Lanark, Scotland So Gen Hosp Glasgow Lanark Scotland G51 4TF gow G51 4TF, Lanark, Scotland Univ Glasgow, Dept Med & Therapeut, Glasgow, Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland herapeut, Glasgow, Lanark, Scotland
Titolo Testata:
STROKE
fascicolo: 4, volume: 31, anno: 2000,
pagine: 907 - 914
SICI:
0039-2499(200004)31:4<907:IOE"IA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPONTANEOUS ECHO CONTRAST; ATRIAL SPONTANEOUS CONTRAST; TRANSESOPHAGEAL ECHOCARDIOGRAPHY; THROMBUS; FIBRILLATION; BLOOD; DIFFERENTIATION; ERYTHROCYTES; STENOSIS; STROKE;
Keywords:
cerebral embolism; spontaneous echo contrast; ultrasound, Doppler, transcranial;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Yang, Y Univ Alberta, Cerebrovasc Lab, HMRC, Dept Med,Neurol Div, Rm 530, Edmonton, AB T6G 2S2, Canada Univ Alberta Rm 530 Edmonton AB Canada T6G 2S2 AB T6G 2S2, Canada
Citazione:
Y. Yang et al., "Identification of echocardiographic "smoke" in a bench model with transcranial Doppler ultrasound", STROKE, 31(4), 2000, pp. 907-914

Abstract

Background and Purpose-Spontaneous echo contrast in cardiac chamber has been indicated as a source of cerebral embolism. The nature of the echocardiographic smokelike signal is still not fully understood. This study was designed to regenerate spontaneous echo contrast and verify its thromboembolic characters in an in vitro model. Methods-Spontaneous echo contrast was reproduced in an expansion chamber under low flow conditions in a close circulation system. The spontaneous echo contrast was monitored and recorded with a 2-dimensional cardiosonographysystem and a transcranial Doppler device. Meanwhile, clinically commonly encountered embolic materials such as whole-blood clots, platelet aggregate-rich plasma, air bubbles, and 100-mL normal saline were injected into this monitored circuit. The differentiation of spontaneous echo contrast from emboli was performed by both visual observations of the echo images and offline Doppler signal intensity analysis. Average signal intensities produced by spontaneous contrast and injection of embolic materials and saline were compared. Furthermore, the effect of Doppler-detected flow velocity on generation of spontaneous contrast was also evaluated. Results-Spontaneous echo contrast was reproduced at low flow settings (90 to 120 mL/min) in this model. There was no significant difference in average signal intensity between the flow with spontaneous echo contrast and thatwithout the echo (P=0.71). However, injection of embolic materials or normal saline did not generate smokelike image but caused much higher average signal intensity than the flow with spontaneous contrast (P<0.001). Injection of normal saline also increased average signal intensity. Conclusions-Our results suggest that smokelike echo is a special echo phenomenon occurring at low flow situations and does not itself produce material capable of embolizing into the systemic circulation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/04/20 alle ore 10:47:33