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Erschienen in: Heart and Vessels 1/2023

27.07.2022 | Original Article

Usefulness of the predicted percentage ventilatory efficiency for carbon dioxide output during exercise in patients with chronic heart failure

verfasst von: Kohei Ashikaga, Haruki Itoh, Tomoko Maeda, Hidetaka Itoh, Shiori Tanaka, Yuri Ichikawa, Masatoshi Nagayama, Yoshihiro J. Akashi, Mitsuaki Isobe

Erschienen in: Heart and Vessels | Ausgabe 1/2023

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Abstract

The ventilatory efficiency for carbon dioxide output (\({\dot{\text{V}}}\)CO2) during exercise, as measured by the minute ventilation vs. \({\dot{\text{V}}}\)CO2 slope (\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope), is a powerful prognostic index in patients with chronic heart failure (CHF). This measurement is higher in women than in men, and it increases with age. This study aimed to investigate the usefulness of the predicted value of the percentage \({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope (%\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope) as a prognostic index in patients with CHF. A total of 320 patients with CHF and a left ventricular ejection fraction (LVEF) < 45% (male, 85.6%; mean age, 64.6 years) who underwent symptom-limited cardiopulmonary exercise tests using a cycle ergometer were included in the study. The %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 was calculated using predictive formulae based on age and sex. Cardiovascular-related death was defined as the primary endpoint. The mean follow-up duration was 7.5 ± 3.3 years. Of 101 patients who died during the study period, 75 experienced cardiovascular-related deaths. The average \({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope was 32.8 ± 8.0, and the average %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope was 119.6 ± 28.2%. The cumulative incidence of cardiovascular-related death after 10 years of follow-up were 44.7% (95% CI 34.4–54.6%) in patients with %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope > 120 and 15.0% (95% CI 9.4–21.8%) in patients with %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope ≤ 120. The multivariate Cox regression analysis indicated that a %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope > 120 was an independent predictor of cardiovascular-related death (adjusted hazard ratio, 3.24; 95% confidence interval 1.65–6.67; p < 0.01). The %\({\dot{\text{V}}}\)E vs. \({\dot{\text{V}}}\)CO2 slope can be used for risk stratification in patients with CHF and an LVEF < 45%.
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Metadaten
Titel
Usefulness of the predicted percentage ventilatory efficiency for carbon dioxide output during exercise in patients with chronic heart failure
verfasst von
Kohei Ashikaga
Haruki Itoh
Tomoko Maeda
Hidetaka Itoh
Shiori Tanaka
Yuri Ichikawa
Masatoshi Nagayama
Yoshihiro J. Akashi
Mitsuaki Isobe
Publikationsdatum
27.07.2022
Verlag
Springer Japan
Erschienen in
Heart and Vessels / Ausgabe 1/2023
Print ISSN: 0910-8327
Elektronische ISSN: 1615-2573
DOI
https://doi.org/10.1007/s00380-022-02132-w

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