Hemodynamic and respiratory variation in the six-minute walk test in patients undergoing cardiac surgery: a cross-sectional study
DOI:
https://doi.org/10.1590/Keywords:
Thoracic Surgery, Cardiovascular Diseases, Walking TestAbstract
The six-minute walk test (6MWT) is prescribed
for patients who underwent cardiac surgery, but the
hemodynamic and respiratory variation is still poorly
described in this population. This study aimed to compare
the hemodynamic and respiratory data, dyspnea sensation
variation, as well as the perceived exertion in the lower limbs
during the 6MWT between the pre and post-test and analyze
whether there is a difference in the variation between the
pre and postoperative periods of elective cardiac surgery
for the same variables. Cross-sectional study with 113
individuals undergoing elective cardiac surgery. The 6MWT
was performed the day before surgery and on the fourth
postoperative day. It was found that between the pre and
post test, there was an increase in hemodynamic variables
including HR, SBP, DBP (p ≤0.01) and dyspnea and lower limbs
(p≤0.01), both in the pre and in the postoperative period; there
was no variation in SpO2 both preoperatively (p=0.64) and
postoperatively (p=0.45); decrease in the average distance
covered in the preoperative period from 346.98±107.51 to
252.06±107.17 meters. There was a greater variation in the mean difference between the pre and post test for HR in the pre
period (p=0.05) and a greater feeling of perceived exertion in the
lower limbs in the postoperative period (p=0.02). Between the pre
and post-test, there was a physiological increase in hemodynamic
data, sensation of perceived exertion, without SpO2 alteration,
and functional decline in the distance covered between the preand
postoperative periods of cardiac surgery. The HR has greater
variation in the pre and the exertion perceived in the lower limbs in
the postoperative period, although clinically not relevant
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