Simultaneous Exercise Stress Cardiac Magnetic Resonance and Cardiopulmonary Exercise Testing to Elucidate the Fick Components of Aerobic Exercise Capacity: a Feasibility and Reproducibility Study and Pilot Study in Hematologic Cancer Survivors

Overview

Journal Cardiooncology

Publisher Biomed Central

Specialty Oncology

Date 2023 Jul 10

PMID 37430330

Authors

Justin M Canada

John McCarty

Jennifer H Jordan

Cory R Trankle

Kevin DeCamp

Josh D West

Mary Ann Reynolds

Rachel Myers

Katey Sweat

Virginia McGhee

Ross Arena

Antonio Abbate

W Gregory Hundley

Affiliations

Soon will be listed here.

Abstract

Background: Patients treated for hematologic malignancy often experience reduced exercise capacity and increased fatigue; however whether this reduction is related to cardiac dysfunction or impairment of skeletal muscle oxygen extraction during activity is unknown. Cardiopulmonary exercise testing (CPET) coupled with stress cardiac magnetic resonance (ExeCMR), may provide a noninvasive method to identify the abnormalities of cardiac function or skeletal muscle oxygen extraction. This study was performed to determine the feasibility and reproducibility of a ExeCMR + CPET technique to measure the Fick components of peak oxygen consumption (VO) and pilot its discriminatory potential in hematologic cancer patients experiencing fatigue.

Methods: We studied 16 individuals undergoing ExeCMR to determine exercise cardiac reserve with simultaneous measures of VO. The arteriovenous oxygen content difference (a-vOdiff) was calculated as the quotient of VO/cardiac index (CI). Repeatability in measurements of peak VO, CI, and a-vOdiff was assessed in seven healthy controls. Finally, we measured the Fick determinants of peak VO in hematologic cancer survivors with fatigue (n = 6) and compared them to age/gender-matched healthy controls (n = 6).

Results: Study procedures were successfully completed without any adverse events in all subjects (N = 16, 100%). The protocol demonstrated good-excellent test-retest reproducibility for peak VO (intraclass correlation coefficient [ICC] = 0.992 [95%CI:0.955-0.999]; P < 0.001), peak CI (ICC = 0.970 [95%CI:0.838-0.995]; P < 0.001), and a-vOdiff (ICC = 0.953 [95%CI:0.744-0.992]; P < 0.001). Hematologic cancer survivors with fatigue demonstrated a significantly lower peak VO (17.1 [13.5-23.5] vs. 26.0 [19.7-29.5] mL·kg·min, P = 0.026) and lower peak CI (5.0 [4.7-6.3] vs. 7.4 [7.0-8.8] L·min/m, P = 0.004) without a significant difference in a-vOdiff (14.4 [11.8-16.9] vs. 13.6 [10.9-15.4] mLO/dL, P = 0.589).

Conclusions: Noninvasive measurement of peak VO Fick determinants is feasible and reliable with an ExeCMR + CPET protocol in those treated for a hematologic malignancy and may offer insight into the mechanisms of exercise intolerance in those experiencing fatigue.

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