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Biomedical subjects

C Veyrat

Publications and source records attributed to C Veyrat.

9 recordsLinked to original sources
PubMed1979

[Noninvasive diagnosis of ventricular septal defects using echo-pulsed Doppler velocimetry, localization, evaluation of the shunt and the associated lesions].

A preliminary study of 15 patients with ventricular septal defect demonstrates that Echo-Doppler velocimetry allows the non-invasive diagnosis of this malformation in 80% of the cases, as well as its localisation and detection of associated lesions; tin addition evaluation of the shunt is made feasible by non invasive recording of the flow velocity curves of the shunt and of the pulmonary artery according to a technique derived from the basic one. This method turns out to be essential for establishing the aetiological diagnosis of left parasternal systolic murmurs.

Adolescent↗
PubMed1977

[Non-invasive exploration of valvular heart disease using Pulsed Doppler Flowmetry with echography (author's transl)].

A new method for diagnosing and assessing valvular heart disease is proposed, based on the analysis of transvalvular, pulmonary artery and aortic flow velocity curves recorded transcutaneously using Pulsed Doppler-echography. The normal tracings are presented and anomalies of the curves disclosed in 97 patients are analysed. It is concluded that this new, simple, non-invasive and repetable method is useful for diagnosing and assessing valvular heart disease, within limitations which are discussed.

Blood Flow Velocity↗
PubMed1976

[Recording by transcutaneous route of the normal and pathological curves of mitral blood velocity by pulsed emission and modulated reception Doppler technic associated with echocardiography. Preliminary report].

A new method, derived from the Pulsed Doppler Technique is proposed for recording transcutaneously the Mitral Valve flow velocity curves in normal subjects and diseased states. The recorded curves are described and found similar to those obtained experimentally in animals or clinically using CW doppler cardiac catheterization. Characteristic anomalies are found for each type of lesion (stenosis and/or regurgitation) and correlated with the degree of its severity. The authors conclude that this technique may provide a new non-invasive method for diagnosing and assessing Mitral Valve disease.

Adolescent↗
PubMed1975

Normal pattern and physiological significance of mitral valve flow velocity recorded using transseptal directional Doppler ultrasound catheterization.

In 10 cardiac patients in whom an organic lesion of the mitral valve was exluded by standard investigation procedures during which a diagnostic transseptal catheterization for pressure measurements in the left heart was performed, the authors placed a directional Doppler ultrasonic catheter tip velocimeter at the site of the mitral ring and recorded the mitral flow velocity traces. The pattern of these normal curves is presented and a physiological interpretation proposed. The relation between the mitral flow velocity and low volume curves is discussed in the light of present experimental data on mitral valve flow velocity profiles and variations in size of the mitral orifice. The authors concluded that the flow velocity curves obtained by the Doppler technique constitute a valid physiological reference system for the study of the mitral valve flow velocity tracings that can be recorded in the various forms of mitral valve disease.

Adult↗
PubMed1975

Diagnosis and evaluation of mitral valve disease using transseptal Doppler ultrasound catheterization.

In 33 patients with confirmed mitral valve disease, the mitral valve flow velocity traces were recorded by means of a directional Doppler ultrasonic velocimeter using the transseptal route, and correlated with the clinical and haemodynamic data. In all cases, characteristic anomalies of the mitral flow velocity patterns were noted and could be related to the type of lesion, stenosis, regurgitation, or a combination of these. Furthermore, specific patterns of the flow velocity traces were shown to correlate satisfactorily with the degree of severity of the disease. The authors propose a pathophysiological interpretation of the anomalies of the velocity patterns, based on turbulence for stenosis and backward flow wave for regurgitation. They conclude that the transseptal directional Doppler catheterization provides a new reliable method for establishing the diagnosis and grading the severity of mitral valve disease using pattern recognition, and, moreover, offers a new approach to the understanding of mitral haemodynamic disturbances on a beat-to-beat basis.

Adult↗