A transpulmonary contrast medium enhances the transcranial Doppler signal in humans.
نویسندگان
چکیده
منابع مشابه
A transpulmonary contrast medium enhances the transcranial Doppler signal in humans.
BACKGROUND AND PURPOSE Transtemporal insonation in transcranial Doppler sonography is often impaired by an insufficient signal-to-noise ratio, especially in elderly patients. A transpulmonary stable air microbubble suspension was injected intravenously in humans as an intracranial ultrasonic contrast agent. METHODS In a clinical phase II study, 20 patients (15 women, 5 men; mean age, 65.5 +/-...
متن کاملQuantitative evaluation of contrast enhanced transcranial Doppler signal using galactose based echo-contrast agent in dogs.
Transcranial Doppler ultrasonography (TCD) is hindered by insufficient ultrasound penetration through the temporal bone. The use of echo-contrast agents to enhance the Doppler signal is an important step toward the solution of this problem. The aim of the present study was to investigate the tolerability and diagnostic value of the intravenous echo-contrast agent, Levovist. Levovist was adminis...
متن کاملA comparison of transesophageal echocardiography and transcranial Doppler sonography with contrast medium for detection of patent foramen ovale.
BACKGROUND Patent foramen ovale as a possible stroke risk factor can be diagnosed with transcranial Doppler sonography (TCD) by detecting intravenous contrast medium crossing from the right to the left atrium. The present study evaluates the reliability of this method. SUMMARY OF REPORT We performed TCD and transesophageal echocardiography simultaneously in 50 patients using galactose microbu...
متن کاملOptimizing the technique of contrast transcranial Doppler ultrasound in the detection of right-to-left shunts.
BACKGROUND AND PURPOSE A cardiac right-to-left shunt (RLS) can be identified by transesophageal echocardiography and transcranial Doppler ultrasound (TCD) with contrast agents and a Valsalva maneuver (VM) as a provocation procedure. This article applies the modalities of these tests detailed in previous studies to a large patient cohort and compares 2 contrast agents (saline and Echovist-300). ...
متن کاملAssessments of flow by transcranial Doppler ultrasound in the middle cerebral artery during exercise in humans.
This study examined the consistency between three indexes of cerebral blood flow (CBF) obtained by using transcranial Doppler ultrasound in eight human volunteers. Each subject undertook three sessions of graded exercise, consisting of 6 min of rest, 6 min at 20% of maximal oxygen uptake (VO2 max), 6 min at 40% VO2 max, and 6 min of recovery. Values were obtained every 10 ms for the velocity as...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Stroke
سال: 1993
ISSN: 0039-2499,1524-4628
DOI: 10.1161/01.str.24.12.1903