Key result
V/Q mismatch and gas exchange efficiency worsened during exercise in patients with HFpEF, as reflected by an increase in VD/VT VDM.
Why the study?
Does correcting for apparatus dead space (VDM) when calculating physiological dead space (VD/VT) during exercise reveal worsening V/Q mismatch in patients with HFpEF?
Observational
Does correcting for apparatus dead space (VDM) when calculating physiological dead space (VD/VT) during exercise reveal worsening V/Q mismatch in patients with HFpEF?
Correcting for apparatus dead space when calculating physiological dead space during exercise reveals previously unrecognized worsening of V/Q mismatch and gas exchange efficiency in HFpEF.
Answers are grounded in this paper and cite their sources.
Clinicians should correct for apparatus dead space in HFpEF exercise testing; extends gas exchange assessment but leaves open therapeutic relevance.
Calculating VD/VT with and without correcting for VDM yields quantitively and qualitatively different results, which could have an important impact on the interpretation of V/Q mismatch in HFpEF. The finding that V/Q mismatch and gas exchange efficiency worsened, as reflected by an increase in VD/VT VDM during exercise, has not been previously demonstrated in HFpEF. Thus, further studies are needed to investigate the mechanisms explaining the increase in VD/VT VDM during exercise in patients with HFpEF.
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Balmain et al. (2022) conducted an observational in Heart failure with preserved ejection fraction (HFpEF). Exercise was evaluated on V/Q mismatch and gas exchange efficiency (VD/VT VDM). V/Q mismatch and gas exchange efficiency worsened during exercise in patients with HFpEF, as reflected by an increase in VD/VT VDM.
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