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Biomedical subjects

J C Hayes

Publications and source records attributed to J C Hayes.

27 records · Page 2Linked to original sources
PubMed1991

A comparison between computer-controlled and set work rate exercise based on target heart rate.

Good exercise prescriptions provide work rates (WRs) that maintain heart rates (HR) in a target zone and at a percent of maximum metabolic equivalent (%METmax). HR and MET were evaluated from computer-controlled and set WR (constant speed) sessions (20 min at 65% METmax). Computer-controlled WR used a control algorithm to adjust speed and grade to maintain the target HR. The set WR (mean +/- S.D.) HR (139 +/- 8 bpm) was lower (p less than 0.05) than the target (147 +/- 3 bpm) and computer-controlled HRs (153 +/- 5 bpm). The set WR MET (8.6 +/- 2.2) was not different than the target (8.6 +/- 2.2), but both were lower than computer-controlled exercise (9.7 +/- 2.2). Computer-control time in target HR zone (16 +/- 5 min) was significantly (p less than 0.004) greater than set WR exercise (6 +/- 5 min). Computer-controlled WR was significantly better in maintaining target HR and the MET values were not physiologically different than target WRs.

Adult↗
PubMed1977

Pathogenesis of an unexpected sudden death: role of early cycle ventricular premature contractions.

A 61 year old man who had been studied extensively died unexpectedly ("instantaneously") outside the hospital while wearing an electrocardiographic recorder. Death was caused by ventricular fibrillation, which was initiated by an early cycle ventricular premature contraction occurring in the vulnerable period of repolarization. Such early cycle ventricular premature contraction had been noted in recordings 4 years previously but had never been observed to encroach on the T wave until 5 minutes before death. In the intervening period, the patient had shown increasing evidence of myocardial ischemia and hypertrophy and congestive heart failure, which had been partly obscured by his concealment or denial of symptoms and refusal to change his pattern of activities. Autopsy revealed two old myocardial infarcts and pronounced left ventricular hypertrophy. There was advanced occlusive arteriosclerosis of the major coronary vessels with a recent thrombus in the right coronary artery.

Arrhythmias, Cardiac↗
PubMedDate not supplied

Current feeding policies for patients with stroke.

It is well known that policies for feeding patients who have suffered a recent stroke vary enormously. The choice of method used may depend on the severity of the stroke, i.e. swallowing ability, conscious level, ability to communicate and the level of sensory and motor dysfunction. Other considerations may include age and previous nutritional status. However, in the absence of evidence from controlled clinical trials, the preferences of individual physicians and nurses may have a significant influence. As part of the preparatory work before the start of a clinical trial of different feeding policies, the author wished to assess both the degree of variability of feeding practice on wards in the same hospital and also whether there were reasons other than lack of evidence which influenced feeding policies. One nurse from each of 19 wards (one neurology, nine medical and nine care of the elderly) in two hospitals of the same trust was interviewed to ascertain their current feeding practice for patients with stroke. The results showed the expected variability in feeding practice, possibly reflecting the uncertainties felt by physicians and nurses in this area. However, many comments revealed the concerns that nurses have in trying to meet the nutritional needs of their stroke patients in busy acute general hospitals.

Aged↗
PubMedDate not supplied

Quit rates at one year follow-up of Alaska Native Medical Center Tobacco Cessation Program.

The prevalence of tobacco use in the Alaska Native population is unusually high, as high as 50% in both adult men and women. In June of 1992, the Alaska Native Medical Center and the Alaska Area Native Health Service began a tobacco cessation program using behavioral modification classes and transdermal nicotine patches. Patients were subsequently followed at three month intervals for a year to assess smoking status. To date, 193 people have completed the program with at least three months having elapsed since completion of classes. The quit rates at three, six, nine, and twelve months were 31%, 30%, 24%, 21% respectively. The long-term quit rates for this tobacco cessation program are comparable to the rates of other studies which have included both behavioral modification and transdermal nicotine.

Administration, Cutaneous↗