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Biomedical subjects

D W Baker

Publications and source records attributed to D W Baker.

At least 73 records · Page 4Linked to original sources
PubMed1984

Hydrocephalus with cerebral aqueductal dysgenesis and craniofacial anomalies.

A pre-term infant was born with multiple limb and craniofacial anomalies, including craniosynostosis and a nasopharyngeal adenohypophysis. Severe hydrocephalus of the lateral and third ventricles was attributed to cerebral aqueductal dysgenesis. Scattered aqueductules and ependymal rosettes were found throughout the midbrain and pontine tegmentum. An hypothesis to explain the unique constellation of craniocerebral findings is discussed.

Abnormalities, Multiple↗
PubMed1980

Doppler echocardiography: applications, limitations and future directions.

On the basis of principles that are similar to (but differ slightly from) those that underlie M mode and two dimensional techniques, pulsed Doppler echocardiography permits evaluation of intracardiac blood flow noninvasively. This technique is helpful in the diagnosis and management of patients with valvular and congenital heart disease, and in some circumstances provides information not available from M mode or two dimensional imaging. Despite several notable limitations, pulsed Doppler echocardiography is a useful diagnostic technique whose clinical application is likely to increase as future technologic improvements occur.

Aortic Valve Insufficiency↗
PubMed1977

Detection of aortic insufficiency by pulse Doppler echocardiography.

Sixty-five patients were studied for the presence of aortic insufficiency by auscultation, conventional M mode echocardiography (echo), range-gated pulse Doppler flowmeter (Doppler), and supravalvular aortic angiography. Aortic insufficiency was demonstrated angiographically in 49 patients, of which eight (16%) were missed by auscultation. Echo missed 20 (41%), and Doppler missed seven (14%). Only two (4%) were missed by auscultation and Doppler combined. All methods were highly specific, but the combination of auscultation and Doppler was the most sensitive noninvasive method for detecting aortic insufficiency.

Aortic Valve Insufficiency↗
PubMed1977

Pulsed Doppler echocardiography: principles and applications.

A new recording and display system is described for use with pulsed Doppler blood flow velocity detectors in the diagnosis of valvular and septal defects. The principles of the pulsed Doppler device are described along with the methods used to analyze and display the Doppler shifted signal from flow jets resulting from various valve defects. An M-mode display is combined with blood flow display to provide a convenient record of the clinical procedure. Examples of aortic stenosis, aortic insufficiency, mitral stenosis and regurgitation are presented along with signals from other valves.

Aortic Valve Insufficiency↗
PubMed1977

A readout for pulsed Doppler velocity meters.

The use of the pulsed Doppler velocity meter in cardiovascular applications has been restricted, due in part to difficulties in experimental usage of the device and systematic errors in signal processing, leading to inaccurate results. These problems have been alleviated by a multiparameter readout which provides information on the position of the sample region with respect to surrounding tissues in an M-mode type display, and a first moment Doppler frequency shift output capable of following the rapid velocity fluctuations which occur in disturbed flow conditions. The use of the readout in obtaining blood velocity measurements from within the human heart is demonstrated with representative examples of output for various clinical situations.

Aortic Valve Insufficiency↗
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↗