Ventilatory Efficiency Identifies Patients Prone to Hypoxemia During One-Lung Ventilation

CHOBOLA, Miloš, Pavel HOMOLKA, Michal BENEJ, Zdeněk CHOVANEC, Kristián BRAT, Vladimír ŠRÁMEK, Lyle J. OLSON and Ivan ČUNDRLE. Ventilatory Efficiency Identifies Patients Prone to Hypoxemia During One-Lung Ventilation. JOURNAL OF CARDIOTHORACIC AND VASCULAR ANESTHESIA. PHILADELPHIA: W B SAUNDERS CO-ELSEVIER INC, 2019, vol. 33, No 7, p. 1956-1962. ISSN 1053-0770. Available from: https://dx.doi.org/10.1053/j.jvca.2019.01.057.

Basic information

• Original name: Ventilatory Efficiency Identifies Patients Prone to Hypoxemia During One-Lung Ventilation
• Authors: CHOBOLA, Miloš (203 Czech Republic), Pavel HOMOLKA (203 Czech Republic, belonging to the institution), Michal BENEJ (703 Slovakia, belonging to the institution), Zdeněk CHOVANEC (203 Czech Republic, belonging to the institution), Kristián BRAT (703 Slovakia, belonging to the institution), Vladimír ŠRÁMEK (203 Czech Republic), Lyle J. OLSON (840 United States of America) and Ivan ČUNDRLE (203 Czech Republic, guarantor, belonging to the institution).
• Edition: JOURNAL OF CARDIOTHORACIC AND VASCULAR ANESTHESIA, PHILADELPHIA, W B SAUNDERS CO-ELSEVIER INC, 2019, 1053-0770.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 30203 Respiratory systems
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 2.258
• RIV identification code: RIV/00216224:14110/19:00110179
• Organization unit: Faculty of Medicine
• Doi: http://dx.doi.org/10.1053/j.jvca.2019.01.057
• UT WoS: 000473249900028
• Keywords in English: hypoxemia; one-lung ventilation; cardiopulmonary exercise testing
• Tags: 14110118, 14110120, 14110122, 14110215, rivok
• Tags: International impact, Reviewed

Abstract

Objectives: One-lung ventilation (OLV) may be complicated by hypoxemia. Ventilatory efficiency, defined as the ratio of minute ventilation to carbon dioxide output (V-E/VCO2), is increased with ventilation/perfusion mismatch and pulmonary artery hypertension, both of which may be associated with hypoxemia. Hence, the authors hypothesized increased V-E/VCO2 will predict hypoxemia during OLV. Design: Prospective observational study. Setting: Single-center, university, tertiary care hospital. Participants: The study comprised 50 consecutive lung resection candidates. Interventions: All patients underwent cardiopulmonary exercise testing before surgery. Patients who required inspired oxygen fraction (FiO2) >= 0.7 to maintain arterial oxygen (O-2) saturation >90% after 30 minutes of OLV were considered to be hypoxemic. The Student t or Mann-Whitney U test were used for comparison of patients who became hypoxemic and those who did not. Multiple regression analysis adjusted for age, sex, and body mass index was used to evaluate which parameters were associated with the V-E/VCO2 slope. Data are summarized as mean +/- standard deviation. Measurements and Main Results: Twenty-four patients (48%) developed hypoxemia. There was no significant difference in age, sex, and body mass index between hypoxemic and nonhypoxemic patients. However, patients with hypoxemia had a significantly higher V-E/VCO2 slope (30 +/- 5 v 27 +/- 4; p = 0.04) with exercise and lower partial pressure of oxygen/FiO2 (129 +/- 92 v 168 +/- 88; p = 0.01), higher mean positive end expiratory pressure (6.6 +/- 1.5 v 5.6 +/- 0.9 cmH(2)O; p = 0.02), and lower mean pulse oximetry O-2 saturation/FiO2 index (127 +/- 20 v 174 +/- 17; p < 0.01) during OLV. Multiple regression showed V-E/CO2 to be independently associated with the mean pulse oximetry O-2 saturation/FiO2 index (b = 0.28; F = 3.1; p = 0.05). Conclusions: An increased V-E/VCO2 slope may predict hypoxemia development in patients who undergo OLV. (C) 2019 Elsevier Inc. All rights reserved.