DOI
https://doi.org/10.25772/E83G-B432
Defense Date
1992
Document Type
Thesis
Degree Name
Master of Science
Department
Health Related Sciences
First Advisor
James Embrey
Abstract
Seven orthopedic surgery patients requiring the use of a tourniquet were studied. The hypothesis stated that tourniquet application does not affect coagulation. A total of 5 blood samples were drawn perioperatively (preoperative, 5 minutes after induction of anesthesia, 30 minutes after tourniquet inflation, 2 - 5 minutes after tourniquet deflation, and 30 minutes after tourniquet deflation. For each sample, TEG parameters (R, R + k, MA and α) were measured.
The value for each TEG parameter was compared by analysis of variance (ANOVA), then the samples were contrasted and examined by repeated measures ANOVA. None of the TEG parameters showed a statistically significant difference in the blood samples before, during or after tourniquet application. The hypothesis could not be rejected at the α = .05 level of significance. A t test was used to examine the effect of anesthesia on coagulation. The TEG parameters indicated a significant relationship between the TEG values R and R + k, and a near significant relationship between TEG values MA and a and the administration of anesthesia.
It was concluded that tourniquet use does not effect coagulation when applied 2 hours or less. However, anesthesia had a significant effect on TEG parameters R and R + k. The clinical significance of this effect was questionable since the type of anesthesia varied in some patients, and none of the patients in the study demonstrated symptoms of coagulopathy.
Rights
© The Author
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission
9-27-2017
Comments
Scanned, with permission from the author, from the original print version, which resides in University Archives.