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A K Ellis

Publications and source records attributed to A K Ellis.

23 records · Page 2Linked to original sources
PubMed1976

Cardiac output determination by simple one-step rebreathing technique.

We have developed a rebreathing technique for measuring cardiac output in resting or exercising subjects. The data needed are the subject's CO2 dissociation curve, the initial volume and CO2 fraction of the rebreathing bag, and a record of CO2 at the mouth during the maneuver. From these one can obtain all the values required to solve the Fick equation. The combined error due to inaccuracy in reading the tracings and to the simplifying assumptions was found to be small (mean = 0.5%, SD ;.5%). Cardiac output values determined with this technique in normal subjects were on the average 2% higher than those obtained simultaneously with an acetylene rebreathing method (n = 49, SD = 11%). Among the advantages of the technique are that it requires analysis of a single gas, takes less than thirty seconds per determination, allows one to obtain repeated measurements at rapid intervals, is not affected by the ability of lung tissue to store CO2, and eliminates many of the assumptions usually made in non-invasive measurements of cardiac output.

Acetylene↗
PubMedDate not supplied

Quality of life in women with urinary tract infections: is benign disease a misnomer?

BACKGROUND: The objective of this study was to undertake an exploratory evaluation of quality-of-life indicators for women suffering from urinary tract infections. METHODS: The RAND 36-Item Health Survey 1.0 (SF-36) was administered to 47 women with a diagnosed urinary tract infection who were being cared for in the Family Medicine Center, Student Health Services, or Urology Outpatient Clinic. A control population of 71 women was obtained from the female members of an undergraduate geography class, a community basketball league, and a local women's choir. RESULTS: All subsections of the SF-36 quality-of-life indices were significantly decreased in the subject population compared with the control population (lower score indicates lower quality of life): patient general health perception (63.3 vs 78.9, P < .001) physical functioning (76.6 vs 87.6, P = .012), role limitation owing to physical health (53.8 vs 93.0, P < .001) and emotional health (67.4 vs 88.3, P < .001), vitality (43.0 vs 64.9, P < .001), emotional well-being (64.4 vs 80.2, P < .001), pain (58.7 vs 91.5, P < .001), and social functioning (60.4 vs 90.4. P < .001). CONCLUSION: Suffering from an urinary tract infection has a detrimental influence on patient quality of life. The effect of urinary tract infections on women and their perception of quality of life have not been hitherto reported in the medical literature. The significant findings in this study call into question whether acute, non-life-threatening illness should be regarded as benign.

Adolescent↗