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Biomedical subjects

D K Bloomfield

Publications and source records attributed to D K Bloomfield.

At least 19 recordsLinked to original sources
PubMed1988

Hemodynamic responses to positional change in habitually physically active and inactive older men.

This study explored hemodynamic responses to positional change in 11 habitually physically active and 11 physically inactive healthy older men (mean age 70 years). Data were collected in the supine, sitting, standing, and 70 degrees upright tilt positions over a 10-minute period (long-term response). Dependent variables were heart rate, stroke volume, cardiac output, total peripheral resistance, and blood pressure. Stroke volume, cardiac output, and total peripheral resistance were expressed per unit body surface area. The results of this study indicated that the physically active older men had significantly lower resting heart rates and significantly higher stroke volume indices in all four positions compared with the physically inactive men. The physically active men also tended to have lower total peripheral resistance indices and higher cardiac indices in all four positions, but the differences were not statistically significant. However, physically active and inactive older men reacted similarly (with respect to all hemodynamic variables except the stroke volume index) in the sitting, standing and 70 degrees upright tilt positions as compared with the supine; the stroke volume index decreased significantly more compared with that of the supine in the physically active men.

Aged↗
PubMed1978

Consolidation of community hospitals.

The largest component of U.S. health care expenditures is the cost of hospital care. Evidence seems to indicate that community hospital costs can be reduced through the consolidation of some, or even all, hospital services. Although no discernible set of relevant minimal costs for the hospital industry has been established as yet, significant economies of scale can be attributed to the consolidation process. In addition to potential economic benefits, medical benefits can also accure to the community as well when inefficient, low-volume services are combined to provide more attractive resources to highly qualified specialists. Many independent community hospitals operate autonomously, often to the detriment of community health needs and economy. Those hospitals that fail to take advantage of the opportunities offered by consolidation may not be keeping faith with the population they claim to serve.

Cost Control↗
PubMed1978

Secular variation in frequency of premature ventricular contractions in untreated individuals.

Six-hour electrocardiographic monitorings were initially recorded from 40 ambulatory adult subjects (39 male, one female) on successive days. Thirty-eight of the subjects were monitored 6 weeks to 18 months later. Studies of paired time periods, Poisson modeling, and other statistical examinations were performed. Despite an underlying consistency in the data, there was considerable variation in PVC frequency from hour to hour, day to day, and over longer periods of time.

Adult↗
PubMed1976

Artifacts in portable electrocardiographic monitoring.

The development of portable ECG monitoring techniques has brought with it new insights into the electrical activity of the heart, and new problems in interpretation of artifacts. This article summarizes and classifies 15 different types of artifacts observed from dynamic electrocardiography. The artifacts appear partly as pseudo-arrhythmias mimicking supraventricular, ventricular, junctional, and dissociative rhythms. There are also non-arrhythmic artifacts which can be misleading in the interpretation of Q-waves, S-T-segments, and T-waves. Eight of the 15 artifacts have potentially serious consequences if not understood, and in 2 instances an artifact almost led to the unnecessary implantation of an artificial cardiac pacemaker.

Arrhythmias, Cardiac↗