SEARCH · PubMed Health

Results for “Doppler Effect”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources

PubMed1975

[Use of the Doppler effect in pathology and vascular surgery of the lower extremities].

A clinical, arteriographic and hemodynamic comparative study, using the Doppler effect in 100 cases, suggests: -- that a study of the Doppler effect is a very useful method of diagnosis to determine the site of obstruction and the state of the blood vessels beyond the obstruction, even in the absence of adequate radiological images; -- following operation, it permits one to assess a case of thrombosis, even when the latter is not obvious clinically. It makes unnecessary post-operative arteriographic controls in tired or high-risk patients.

Angiography↗

PubMed1978

[Hemotachymetry by Doppler effect (author's transl)].

Transcutaneous hemotachymetry by ultrasonic Doppler effect is a simple, rapid, atraumatic and inexpensive method for obtaining hemodynamic data from cervical arteries; it is immensely useful for diagnosis of circulatory disorders. The author consider the physical principles of the method, its advantages and its drawbacks. Reproducibility and normal hemodynamic values are discussed.

Blood Flow Velocity↗

PubMed1991

Acoustical imaging and processing of blood vessel and the related materials using ultrasound Doppler effect.

In the present paper a method is proposed to measure the degree of the degradation of the elasticity in natural blood vessel and the related materials by using ultrasound Doppler effect. It was found that the deformation rate and its acceleration in the radial direction of the blood vessel can be detected by acoustical imaging and processing using this method. These results were proven to correspond to the degree of the degradation of the elasticity, that is, the degree of viscoelasticity in the blood vessel from the wave versus time pattern detected and its simple analysis. This method was applied to predicting the arteriosclerosis of blood vessels of humans by acoustical imaging and processing uninvadedly, as the characteristics of viscoelasticity in blood vessels.

Algorithms↗

PubMedDate not supplied

[Study of arterial diseases of the lower limbs using an exercise test monitored by Doppler effect ultrasonometry].

A study has been carried out using Doppler ultrasonometry on 223 cases, 191 of them suffering from occlusive or stenosing arterial illnesses and 12 with deep massive venous thrombosis, together with 68 control cases. Systolic tensions in the popliteal, dorsalis pedis and posterior tibialis arteries, both at rest and after a conveniently standardized effort, were studied every five minutes over periods of up to thirty minutes. The results are shown grouping these patients according to their clinical features and giving their different responses to the test. Special emphasis is given to cases of badly compensated recent intermittent claudication, diffused atheromatosis, asymtomatic arterial stenosis, thromboangiitis obliterans, Leriche's syndrome and hypertensive ulcers.

Adolescent↗

PubMed1978

[Extra-intracranial arterial bypasses. Evaluation of their permeability by use of the Doppler effect].

40 temporo-sylvian anastomoses were controlled using Doppler ultrasonic examination. The results are compared to post-operative arteriograms. The Doppler examination has proved to be highly accurate when compared to contrast arteriography in the survey of extra-intracranial anastomosis. This non invasive procedure can easily be repeated. However the size of the revascularized area cannot be estimated. The simultaneous isotopic studies of regional cerebral blood flow could provide a means of quantifying the results of the anastomoses.

Carotid Artery, External↗

PubMedDate not supplied

[Reliability of the results of the ultrasonic hemodynamic recording (Doppler effect) in the diagnosis of cerebral ishemic ischemia of carotid origin].

The Doppler ultrasound diagnosis of carotid artery stenosis (asymetrical systolic and diastolic flows; elevated resistance index: ratio of flow pulse amplitude to systolic and diastolic values; flow reversal in the ophtalmic artery) is compared, in 52 patients, to the clinical, angiographic (40 patients) an surgical findings and to the peroperative measure of intra-arterial pressure and flow (30 patients). Its reliability is proved as a guide for angiographic exploration and for postoperative watching, but it is restricted to great vessels (cervical carotid artery) and is unable to detect ulcerated plate without stenosis.

Angiography↗

PubMed1976