Association of Oscillatory Ventilation during Cardiopulmonary Test to Clinical and Functional Variables of Chronic Heart Failure Patients

Abstract

ObjectiveThe aim of this study is to characterize the presence of exercise oscillatory ventilation (EOV) and to relate it with other cardiopulmonary exercise test (CET) responses and clinical variables.MethodsForty-six male patients (age: 53.1±13.6 years old; left ventricular ejection fraction [LVEF]: 30±8%) with heart failure were recruited to perform a maximal CET and to correlate the CET responses with clinical variables. The EOV was obtained according to Leite et al. criteria and VE/VCO2 > 34 and peak VO2 < 14 ml/kg/min were used to assess patients' severity.ResultsThe EOV was observed in 16 of 24 patients who performed the CET, as well as VE/VCO2 > 34 and peak VO2 < 14 ml/kg/min in 14 and 10 patients, respectively. There was no difference in clinical and CET variables of the patients who presented EOV in CET when compared to non-EOV patients. Also, there was no difference in CET and clinical variables when comparing patients who presented EOV and had a VE/VCO2 slope > 34 to patients who just had one of these responses either.ConclusionThe present study showed that there was an incidence of patients with EOV and lower peak VO2 and higher VE/VCO2 slope values, but they showed no difference on other prognostic variables. As well, there was no influence of the presence of EOV on other parameters of CET in this population, suggesting that this variable may be an independent marker of worst prognosis in HF patients.

Effect of combined physical exercise program on improving the functional capacity and the cardiac autonomic modulation of Chagas cardiomyopathy

“…training 7 . Additionally, despite the ventricular dysfunction presented by the patient, the improvement in PB, VE/ VCO 2slope , and cardiac autonomic modulation may be related to greater cardiac performance 9 .…”

“…Anthropometric, clinical, strength, and hemodynamic characteristics were presented in The following assessments were carried out: i) Anamnesis and anthropometric assessment: measurements of body mass (kg), height (cm), body mass index (BMI), waist circumference (cm), and fat percentage 5 ; ii) Cardiopulmonary exercise test (CPET -VO2000 -Portable Medical Graphics Corporation ® ): The test was performed on a cycle ergometer using a ramp protocol (incrementation of 10W/min) (Inbramed, Porto Alegre, Brazil). Oxygen consumption and workload at peak of CPET, ventilatory anaerobic threshold (VAT), ventilatory efficiency, and periodic breathing were obtained to assess FC 6,7 ; iii) Test of 1-Maximum Repetition (1-MR): the maximum strength of 5 consecutive attempts of the squat and lat pulldown exercises was evaluated 8 , and iv) Heart rate variability (HRV) was recorded by ECG system (Wincardio USB, Micromed, Brasília, Brazil) at rest in the supine and sitting positions. SDNN and SD2 indices (representative of the total HRV) and RMSSD, pNN50, NN50, and SD1 (representative of parasympathetic modulation) were analyzed 9 .…”

Reliability and validity of six-minute step test in patients with heart failure

“…The assessment of cardiorespiratory adjustments during physical exercise provides useful prognostic information and a basis to correct exercise prescription and propose interventions in this population ( 1 , 2 ). Cardiopulmonary exercise testing (CPET) is considered the gold standard method to establish exercise capacity and primary limitations, i.e., cardiovascular, ventilatory, or peripheral limitations ( 3 - 5 ). On the other hand, CPET is a complex test and requires controlled environment, costly equipment, and trained staff, often being impracticable for a physiotherapy practice ( 6 ).…”

Importance of Muscle Strength in Chronic Heart Failure

“…Peak oxygen uptake (V Ȯ2peak ) values below 14 mL$min 21 $kg 21 are considered one of the main criteria for heart transplantation (24). In addition, parameters related to ventilatory efficiency, especially high values for minute ventilation/carbon dioxide production slope (VE/VCO 2slope ) and low values for oxygen uptake efficiency slope (OUES) are also considered predictors in the prognosis of CHF as they reflect the adaptative processes that lead to low functional capacity (23,29). The OUES is derived from the relation between oxygen uptake (V Ȯ2 [mL/min]) and minute ventilation (VE [L/min]) during incremental exercise and represents the rate of increase in V Ȯ2 in response to a given increase in VE (5).…”