Title page for ETD etd-32898-13919

Type of Document Master's Thesis
Author Bass, Ila Kristen III
Author's Email Address ibass@vt.edu
URN etd-32898-13919
Title Quality of Life Three Months After Coronary Artery Bypass Surgery: Effects of Presurgical Physical Fitness
Degree Master of Science
Department Human Nutrition, Foods, and Exercise
Advisory Committee
Advisor Name Title
Bos, Ronald R.
Redican, Kerry J.
Sebolt, Don R.
Taylor, Larry T.
Herbert, William G. Committee Chair
  • CABG
  • Physical Fitness
  • Health Related Quality of Life
Date of Defense 1998-04-21
Availability unrestricted
Coronary artery bypass grafting (CABG) is a procedure used to help improve

and save the lives of thousands of coronary artery diseased patients every year.

Measuring health-related quality of life (HRQL) significantly contributes to

understanding patient perceptions of outcomes attributable to this surgery. Previous

research on patient outcomes for CABG has included the evaluation of changes in

HRQL at intervals of 3-6 mo postsurgery. There is a lack of research, however, that

evaluates how physical fitness levels of CABG patients prior to surgery, may affect

these HRQL outcomes. The purpose of this study was to develop a prediction

equation, using fitness in addition to other combined variables, that predicts HRQL 3

mo after CABG. This study evaluated the influences of prior physical fitness, when

these attributes are considered in combination with other clinical variables.

Moreover, whether these variables would be possible predictors of health-related

quality of life outcomes 3 mo after CABG were evaluated. These variables consisted

of heart disease risk factors, physical fitness measures, and whether or not the patients

had histories of various comorbid conditions, including that of prior history of

myocardial infarction. The HRQL was assessed using the Medical Outcomes Study

Short Form 36 (MOS SF-36), and concurrently, questionnaire data were collected

with several other patient perceived measures expected to have potential confounding

influences on HRQL; the MOS Social Support Scale; Beck Depression Inventory;

Health Complaints Scale; the Life Orientation Test for optimism/pessimism. In all,

45 men and 10 women, were evaluated just prior to and 3 mo following CABG. Two

of the eight subscales of the MOS SF-36 were predicted at an adjusted R 2 of greater

than 50%. The sum of three skinfolds was the only physical fitness measure

combined with current smoker, Beck Depression Inventory, presurgical General

Health Perception and the Medical Outcomes Study Social Support Scale, that

contributed most to predicting General Health Perception (R 2 =.68). Elbow flexion

was the only physical fitness variable, combined with four presurgical MOS SF-36

subscales (Mental Health, Role Physical, Social Functioning and General Health

Perception) that contributed to predicting the subscale of mental health (R 2 =.61).

Physical fitness did contribute to predicting the global scope of health perception and

mental health. Physical and social domains of HRQL, however, were not

significantly predicted. Presurgical HRQL was most significant when predicting

postsurgical HRQL. Therefore, in order to predict postsurgical HRQL, presurgical

HRQL should be used. Physical fitness variables can be utilized to contribute to

predicting certain aspects of HRQL.

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