Biomedical subjects

W A Tansey

Publications and source records attributed to W A Tansey.

4 recordsLinked to original sources

PubMed1979

Asynchronous ventricular relaxation: an angiographic temporal analysis of asynchronous left ventricular relaxation in man.

Segmental "early relaxation" is a common angiographic finding. An attempt was made to elucidate the temporal characteristics of this event. Twenty subjects with and 20 without segmental early relaxation were studied. The left ventricular diastolic relaxation time was precisely determined angiographically, and the findings were as follows: 0.12 +/- 0.04 second (mean +/- standard deviation) in the normal patients, 0.14 +/- 0.03 second in the patients with coronary artery disease but no segmental early relaxation and 0.20 +/- 0.04 second in the patients with segmental early relaxation. These findings indicate that early relaxation is associated with a significantly prolonged ventricular relaxation time. The use of the term asynchronous ventricular relaxation is proposed to denote the disturbed diastolic properties of the ventricle with "early relaxation."

Angiocardiography↗

PubMed1979

Cardiovascular nuclear medicine: an overview.

Some of the available cardiovascular nuclear medicine methods are incompletely validated, and others are incompletely developed. They are, however, of very great potential in diagnostic cardiology, and in patient management. A new era of clinical research and acute care monitoring has been opened by serial, noninvasive, hemodynamic measurements of right ventricular as well as left ventricular function. Stress testing has become more specific, and should, with future developments, become more specific, and should, with future developments, become more sensitive, using radionuclide procedures. Serious quality control and validation questions concerning thallium stress testing must be addressed. Intracoronary injection of radiogases has great potential, although minimal present application. Emission computerized tomography will be an important research tool. Compartmental analysis modeling of first pass tracer injections has much to offer, but is not yet validated. Present growth rate of these procedures is very rapid. Fully developed, cardiovascular nuclear medicine may become the largest component of clinical nuclear medicine practice.

Adult↗

PubMed1979

A sequential angular lead presentation.

The presentation of the frontal leads was altered so that they could be displayed in sequential angular order. This was achieved by insertion of an inverting switch at the output stage of an electrocardiograph, so that the presented sequence of leads would be I, -aVR, II, aVF, III, and -aVL, corresponding to frontal plane vectors of 0 degree, 30 degrees, 60 degrees, 90 degrees, 120 degrees and 150 degrees. This form of presentation was made in normals, patients with myocardial infarction, hemiblock, and switched leads. A smooth flow of ECG information results, the extent of the disease is more easily evaluated, and the QRS, T, and P axis is more easily evaluated. The usefulness of neglected leads in diagnosis may be increased.

Heart Block↗

PubMed1979

Analysis of health data from 10 years of Polaris submarine patrols.

Medical reports from 885 Fleet Ballistic Missile (FBM) submarine patrols (7,650,000 man-days) were analyzed. The data were categorized and compared with data obtained by medical personnel from surface fleet personnel (1,215,918 man-days) during a continuous 7--8 months' deployment of surface vessels in 1973. Surface fleet personnel had a higher illness rate in the categories of respiratory, traumatic, gastrointestinal, dermal, infections, and miscellaneous illness, and a lower rate in genitourinary, systemic (including mononucleosis), cranial, and neuropsychiatric illness compared to submarine personnel. Because of improved atmosphere control, a sharp decline in the level of submarine contaminants occurred between 1965--67. Reports from the 1968--73 period showed a decrease in: 1) respiratory; 2) ear, nose, and throat; 3) gastrointestinal; 4) cardiovascular; 5) urologic; and 6) general medical illness categories; the number of general surgery, orthopedics, dental, and eye illness cases was not affected. Neurologic and psychiatric disease showed the only increases in incidence for this period. The overall decrease in illness can be attributed mainly to the fall in the incidence of respiratory disease, known to be affected by reduced air pollution, and the decline in gastrointestinal illness. This decline occurred in a period during which the incidence of both classes of illness went up in the general population, according to the Health Interview Survey published by DHEW. The improvement of atmosphere control in submarines caused a substantial reduction in contaminants (a decline in tobacco smoking also occurred in this period), which led to a decrease in incidence of illness, particularly respiratory disease. No direct causal relationship between reduction in air pollution and reduction in the incidence of disease could be proven within the framework of this study, however.

Affective Symptoms↗