Six Minutes-Walk Test and Respiratory Function Tests Predict Complications and Mortality in Coronary Artery Bypass Grafting?

¹Department of Physical Therapy, Dante Pazzanese of Cardiology Institute, SP, Brazil
²Department of Physical Therapy, University of São Paulo, SP, Brazil
³Faculty of Medical Sciences of Santa Casa deSão Paulo, SP, Brazil
⁴Faculty of Medical Sciences of Santa Casa de São Paulo, SP, Brazil

^*Corresponding Author: Mariana Graça Gutierrez, Department of Physical Therapy, Dante Pazzanese of Cardiology Institute, 500 - Vila Mariana, Sao Paulo 04012-909, Brazil.

Received: October 31, 2019
Published: November 17, 2019

ABSTRACT

Objective: To disclose the relationships between clinical characteristics, six minute walk test, spirometry and inspiratory muscle strength with possible complications of coronary artery bypass grafting.

Method: Longitudinal observational studies with patients who will perform elective of coronary artery bypass grafting at the cardiology Hospital. Were included clinically stable patients of both sexes and older than 18 years old. The data collection was divided into preoperative, intraoperative and postoperative period. For quantitative variables was used the Student's t-test or the Mann-Whitney test. The verification of the association between categorical variables was used the Fisher or Chi-square test, and the Odds ratio estimate was calculated. The level of significance adopted was 5%.

Results: In the study, 52 patients who performed the surgery, 51.92% had some type of complication or died. Perfusion time high was predictors of hospital complications and mortality (p=0.05), as well a EuroScore above 2 (p=0.038), smoking or ex-smoking (p=0.04), low values of forced expiratory volume in the first second (p=0.035) and forced vital capacity (p=0.0001), high body mass index (p=0.01), and low values of inspiratory muscle strength (p=0.01).

Conclusion: Low values of forced expiratory volume in the first second, forced vital capacity and inspiratory muscle strength were predictive of complications and mortality in coronary artery bypass grafting. The six minute walk test wasn’t a predictor.

Keywords: 6-minute walk test, Coronary artery bypass, Spirometry, Maximal respiratory pressures.