Cardiothoracic Surgery |

Feasibility Study of Treadmill Exercise Tolerance Test as a Surrogate for the Measurement of VO2max FREE TO VIEW

Shigeto Nishikawa; Shigeyuki Tamari; Koji Chihara, MD
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Shizuoka City Shizuoka Hospital, Shizuoka, Japan

Chest. 2014;146(4_MeetingAbstracts):95A. doi:10.1378/chest.1994215
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SESSION TITLE: Cardiothoracic Surgery

SESSION TYPE: Original Investigation Slide

PRESENTED ON: Monday, October 27, 2014 at 07:30 AM - 08:30 AM

PURPOSE: The ACCP guideline 2013 recommendsthat we should measureFEV1 and DLco in all cases, assess the cardiac function in conscious of arteriosclerotic cardiovascular disease, andexam the exercise tolerance test such as step aerobics or measurement of VO2max in the poor riskcandidate.We have performed routinely treadmillexercise tolerance testby Bruce protocol as well as spirometory for an inspection before lung resection, in order to evaluate the exercise tolerance and assess the coronary artery disease. In the case of lung resection with pulmonary comorbidity or pneumonectomy, we have measured VO2max in addition to DLco. The measurement of VO2max costs a lot of time and labor, therefore we study about the feasibility of treadmill exercise tolerance test as a surrogate.

METHODS: Consecutive 24 cases from January 2010 to December 2013 were reviewed. 21 cases were lung resection for lung cancer and 3 cases were surgery for COPD. The patient characteristics were as follows (lung cancer, COPD). Age: 71, 57. FEV1(L): 1.78, 1.23. %FEV1(%): 76, 44. DLco’(mL/min/mmHg): 10.9, 11.0. We calculated the double product (DP) in the each test and verifiedthe correlation betweeneach double product. We also verified the correlation between VO2max and the continuous exercising time in treadmill test.

RESULTS: DP ranged from 14238 to 38709 in the each test. There was a positive correlation in the each DP. The regression line was y=1.08x (r=0.64, p<0.01). VO2max ranged from 10 to 22ml/min/kg, and the continuous exercising time in treadmill test ranged from 105 to 540 seconds.There was a positive correlation between VO2max and exercising time. The regression line was y=0.015x+9.98, r=0.76, p<0.01.

CONCLUSIONS: The exercise load in treadmillexercise tolerance testby Bruce protocol was equal to that of the measurement of VO2max.

CLINICAL IMPLICATIONS: We think the continuous exercising time in the treadmill test has a possibility to be a surrogate forthe measurement of VO2max.

DISCLOSURE: The following authors have nothing to disclose: Shigeto Nishikawa, Shigeyuki Tamari, Koji Chihara

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