Key result
The six-minute walk test induced significant increases in heart rate, blood pressure, and perceived exertion (p≤0.01), with average distance covered decreasing postoperatively from 347m to 252m.
Why the study?
What are the hemodynamic and respiratory variations during the six-minute walk test in patients undergoing elective cardiac surgery?
Cross-Sectional (n=113)
What are the hemodynamic and respiratory variations during the six-minute walk test in patients undergoing elective cardiac surgery?
The 6MWT induces expected physiological increases in hemodynamic parameters and perceived exertion without altering SpO2, alongside a functional decline in distance covered early after cardiac surgery.
Answers are grounded in this paper and cite their sources.
6MWT responses in cardiac surgery patients warrant cautious interpretation; leaves open the need for prospective outcome studies before clinical adoption.
The six-minute walk test (6MWT) is commonly prescribed for cardiac surgery patients, yet the hemodynamic and respiratory variations during the test remain insufficiently described in this population. This study aimed to compare the hemodynamic and respiratory data, dyspnea sensation variation, and perceived exertion in the lower limbs during the 6MWT between the pre- and post-test periods. It also sought to analyze whether there is a difference in the variation between the pre and postoperative periods of elective cardiac surgery for the same variables. This cross-sectional study included 113 individuals undergoing elective cardiac surgery. The 6MWT was conducted the day before surgery and on the fourth postoperative day. Results showed a significant increase in hemodynamic variables, including HR, SBP, DBP (p ≤0.01) and dyspnea and lower limb exertion (p≤0.01), both pre and postoperatively; there was no variation in SpO2 both pre- (p=0.64) and postoperatively (p=0.45). The average distance covered decreased from 346.98±107.51 to 252.06±107.17 m after surgery. There was a greater variation in the mean difference between the pre- and post- test for HR before surgery (p=0.05) and a greater feeling of perceived exertion in the lower limbs after surgery (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 pre- and postoperative periods of cardiac surgery. HR showed greater variation preoperatively, while exertion perceived in the lower limbs did so postoperatively, although this was clinically irrelevant.
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Casagrande et al. (2024) conducted a cross-sectional in elective cardiac surgery (n=113). Six-minute walk test (6MWT) vs. Preoperative vs postoperative periods was evaluated on Hemodynamic variables (HR, SBP, DBP), dyspnea, and lower limb exertion variation (p=≤0.01). The six-minute walk test induced significant increases in heart rate, blood pressure, and perceived exertion (p≤0.01), with average distance covered decreasing postoperatively from 347m to 252m.
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