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Characteristics of patients with a relatively greater minimum VE/VCO2 against peak VO2% and impaired exercise tolerance.

Abstract：

PURPOSE:Cardiopulmonary exercise testing (CPX) is used to evaluate functional capacity and assess prognosis in cardiac patients. Ventilatory efficiency (VE/VCO2) reflects ventilation-perfusion mismatch; the minimum VE/VCO2 value (minVE/VCO2) is representative of pulmonary arterial blood flow in individuals without pulmonary disease. Usually, minVE/VCO2 has a strong relationship with the peak oxygen uptake (VO2), but dissociation can occur. Therefore, we investigated the relationship between minVE/VCO2 and predicted peak VO2 (peak VO2%) and evaluated the parameters associated with a discrepancy between these two parameters. METHODS:A total of 289 Japanese patients underwent CPX using a cycle ergometer with ramp protocols between 2013 and 2014. Among these, 174 patients with a peak VO2% lower than 70% were enrolled. Patients were divided into groups based on their minVE/VCO2 [Low group: minVE/VCO2 < mean - SD (38.8-5.6); High group: minVE/VCO2 > mean + SD (38.8 + 5.6)]. The characteristics and cardiac function at rest, evaluated using echocardiography, were compared between groups. RESULTS:The High group had a significantly lower ejection fraction, stroke volume, and cardiac output, and higher brain natriuretic peptide, tricuspid regurgitation pressure gradient, right ventricular systolic pressure, and peak early diastolic LV filling velocity/peak atrial filling velocity ratio compared with the Low group (p's < 0.01). In addition, the Low group had a significantly higher prevalence of pleural effusion than did the High group (26 vs 11%, p < 0.01). CONCLUSIONS:Patients with a relatively greater minVE/VCO2 in comparison with peak VO2 had impaired cardiac output as well as restricted pulmonary blood flow increase during exercise, partly due to accumulated pleural effusion.

journal_name

Eur J Appl Physiol

journal_title

European journal of applied physiology

authors

Nakade T,Adachi H,Murata M,Oshima S

doi

10.1007/s00421-018-3884-1

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

1547-1553

issue

8

eissn

1439-6319

issn

1439-6327

pii

10.1007/s00421-018-3884-1

journal_volume

118

pub_type

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