Open AccessCarbon dioxide elimination pattern at cardiopulmonary exercise testing in patients with low ejection fraction value
Author(s) -
O. V. Kamenskaya,
И. Ю. Логинова,
Alexander Chernyavskiy,
Д. В. Доронин,
В. В. Ломиворотов
Publication year - 2020
Publication title -
pulʹmonologiâ
Language(s) - English
Resource type - Journals
eISSN - 2541-9617
pISSN - 0869-0189
DOI - 10.18093/0869-0189-2019-29-6-647-653
Subject(s) - ejection fraction , medicine , cardiology , ventricle , vo2 max , exertion , heart failure , heart transplantation , odds ratio , heart rate , blood pressure
The objective of this study was to evaluate partial pressure of end tidal carbon dioxide (PetCO 2 ) over time on exertion (E) and its predictive value in evaluation of risk of unfavorable outcome in patients with low ejection fraction (EF) value. Materials and Methods. Patients (n = 53) with pronounced chronic heart failure (CHF), included in heart transplantation waiting list, were enrolled in the prospective study. All patients underwent cardiopulmonary exercise testing (CPET). Mortality or INCOR left ventricle bypass system implantation according to vital indications within 1 year of follow-up were evaluated as an end-point. Results. Patients with CHF and low EF were characterized by low parameters of E tolerance and peak oxygen consumption (10.4 (9.6–11.7) ml/min/kg). The average PetCO 2 level by group was 30.4 (28.3–33.0) mm Hg; in 32% of patients this value decreased or did not change in CPET compared with that in resting state. The significant relationship between increased risk of unfavorable outcome within 1 year of follow-up with low baseline PetCO2 value (odds ratio (OR) – 0.22 (0.05–0.87); p = 0.020) and absence of its increment in PE (OR – 0.16 (0.10–0.54); p = 0.009) was observed. Conclusion. The significant predictive factors of unfavorable outcome within 1 year of follow-up in patients with pronounced CHF and low EF include PetCO 2 value in resting state, as well as PetCO 2 change over time after E challenge.