Valsalva maneuver in detection of right-to-left shunt by transcranial Doppler.
نویسندگان
چکیده
منابع مشابه
Comparison of agitated saline mixed with blood to agitated saline alone in detecting right-to-left shunt during contrast- transcranial Doppler sonography examination.
PURPOSE To evaluate a technique for contrast agent preparation as mixing the patients' blood with agitated saline and to compare it with agitated saline alone in diagnosis of cardiac right-to-left shunt in regard to their sensitivity, time window, and distribution of artificially induced microembolic signals. METHODS Fifty-two patients with stroke who had Transesophageal echocardiography prov...
متن کاملContrast transcranial Doppler ultrasound in the detection of right-to-left shunts. Reproducibility, comparison of 2 agents, and distribution of microemboli.
BACKGROUND AND PURPOSE Cardiac right-to-left shunts can be identified by transcranial Doppler ultrasound (TCD) with the use of different contrast agents and by transesophageal echocardiography (TEE). Systematic data are available on neither the reproducibility of contrast TCD, the comparison of different contrast agents, nor the comparison of simultaneous bilateral to unilateral recordings. Fur...
متن کاملContrast transcranial Doppler ultrasound in the detection of right-to-left shunts: comparison of different procedures and different contrast agents.
BACKGROUND AND PURPOSE Cardiac right-to-left shunts can be identified by transesophageal echocardiography (TEE) and by transcranial Doppler ultrasound (TCD) with the use of different contrast agents and different provocation procedures. Currently, data on an appropriate time window for the appearance of contrast bubbles in the TCD recording after the injection of the contrast medium and the com...
متن کاملMethodological parameters influence the detection of right-to-left shunts by contrast transcranial Doppler ultrasonography.
BACKGROUND AND PURPOSE Contrast transcranial Doppler ultrasonography is a new method to detect intracardiac right-to-left shunts, such as the patent foramen ovale. However, the methodology of the procedure varies considerably among investigators. This study was undertaken to assess the influence of methodological parameters on the results of the contrast transcranial Doppler examination in the ...
متن کاملPostural dependency of right to left shunt: role of contrast-enhanced transcranial Doppler and its potential clinical implications.
BACKGROUND AND PURPOSE Right to left shunt is involved in conditions in which postural changes may be pathogenically relevant. The aim of this work was to assess the frequency of posturally dependent right to left shunt. METHODS In 109 consecutive right to left shunt-positive subjects (male/female=40/69, age 43+/-12 years), we assessed with contrast-enhanced transcranial Doppler the bubble lo...
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ورودعنوان ژورنال:
- Arquivos de neuro-psiquiatria
دوره 68 6 شماره
صفحات -
تاریخ انتشار 2010