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Balmain BN, Tomlinson AR, MacNamara JP, Hynan LS, Levine BD, Sarma S, Babb TG. Alveolar Dead Space Is Augmented During Exercise in Patients With Heart Failure With Preserved Ejection Fraction. Chest 2022; 162:1349-1359. [PMID: 35753384 PMCID: PMC10403624 DOI: 10.1016/j.chest.2022.06.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/09/2022] [Accepted: 06/09/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Patients with heart failure with preserved ejection fraction (HFpEF) exhibit many cardiopulmonary abnormalities that could result in V˙/Q˙ mismatch, manifesting as an increase in alveolar dead space (VDalveolar) during exercise. Therefore, we tested the hypothesis that VDalveolar would increase during exercise to a greater extent in patients with HFpEF compared with control participants. RESEARCH QUESTION Do patients with HFpEF develop VDalveolar during exercise? STUDY DESIGN AND METHODS Twenty-three patients with HFpEF and 12 control participants were studied. Gas exchange (ventilation [V˙E], oxygen uptake [V˙o2], and CO2 elimination [V˙co2]) and arterial blood gases were analyzed at rest, twenty watts (20W), and peak exercise. Ventilatory efficiency (evaluated as the V˙E/V˙co2 slope) also was measured from rest to 20W in patients with HFpEF. The physiologic dead space (VDphysiologic) to tidal volume (VT) ratio (VD/VT) was calculated using the Enghoff modification of the Bohr equation. VDalveolar was calculated as: (VD / VT × VT) - anatomic dead space. Data were analyzed between groups (patients with HFpEF vs control participants) across conditions (rest, 20W, and peak exercise) using a two-way repeated measures analysis of variance and relationships were analyzed using Pearson correlation coefficient. RESULTS VDalveolar increased from rest (0.12 ± 0.07 L/breath) to 20W (0.22 ± 0.08 L/breath) in patients with HFpEF (P < .01), whereas VDalveolar did not change from rest (0.01 ± 0.06 L/breath) to 20W (0.06 ± 0.13 L/breath) in control participants (P = .19). Thereafter, VDalveolar increased from 20W to peak exercise in patients with HFpEF (0.37 ± 0.16 L/breath; P < .01 vs 20W) and control participants (0.19 ± 0.17 L/breath; P = .03 vs 20W). VDalveolar was greater in patients with HFpEF compared with control participants at rest, 20W, and peak exercise (main effect for group, P < .01). Moreover, the increase in VDalveolar correlated with the V˙E/V˙co2 slope (r = 0.69; P < .01), which was correlated with peak V˙o2peak (r = 0.46; P < .01) in patients with HFpEF. INTERPRETATION These data suggest that the increase in V˙/Q˙ mismatch may be explained by increases in VDalveolar and that increases in VDalveolar worsens ventilatory efficiency, which seems to be a key contributor to exercise intolerance in patients with HFpEF.
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Affiliation(s)
- Bryce N Balmain
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - Andrew R Tomlinson
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - James P MacNamara
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - Linda S Hynan
- Department of Population and Data Sciences (Biostatistics) & Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX
| | - Benjamin D Levine
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - Satyam Sarma
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX
| | - Tony G Babb
- Institute for Exercise and Environmental Medicine, Texas Health Presbyterian Hospital, Dallas, TX; Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX.
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Chang HC, Huang WM, Yu WC, Cheng HM, Guo CY, Chiang CE, Chen CH, Sung SH. Prognostic Role of Pulmonary Function in Patients With Heart Failure With Reduced Ejection Fraction. J Am Heart Assoc 2022; 11:e023422. [PMID: 35289186 PMCID: PMC9075473 DOI: 10.1161/jaha.121.023422] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Background Both ventilatory abnormalities and pulmonary hypertension (PH) are frequently observed in patients with heart failure with reduced ejection fraction. We aim to investigate the association between ventilatory abnormalities and PH in heart failure with reduced ejection fraction, as well as their prognostic impacts. Methods and Results A total of 440 ambulatory patients (age, 66.2±15.8 years; 77% men) with left ventricular ejection fraction ≤40% who underwent comprehensive echocardiography and spirometry were enrolled. Total lung capacity, forced vital capacity, and forced expiratory volume in the first second were obtained. Pulmonary arterial systolic pressure was estimated. PH was defined as a pulmonary arterial systolic pressure of >50 mm Hg. The primary end point was all‐cause mortality at 5 years. Patients with PH had significantly reduced total lung capacity, forced vital capacity, and forced expiratory volume in the first second. During a median follow‐up of 25.9 months, there were 111 deaths. After accounting for age, sex, body mass index, renal function, smoking, left ventricular ejection fraction, and functional capacity, total lung capacity (hazard ratio [HR] per 1 SD, 0.66; 95% CI per 1 SD, 0.46–0.96), forced vital capacity (HR per 1 SD, 0.64; 95% CI per 1 SD, 0.48–0.84), and forced expiratory volume in the first second (HR per 1 SD, 0.72; 95% CI per 1 SD, 0.53–0.98) were all significantly correlated with mortality in patients without PH. Kaplan‐Meier curve demonstrated impaired pulmonary function, defined as forced expiratory volume in the first second ≤58% of predicted or forced vital capacity ≤65% of predicted, was associated with higher mortality in patients without PH (HR, 2.85; 95% CI, 1.66–4.89), but not in patients with PH (HR, 1.05; 95% CI, 0.61–1.82). Conclusions Ventilatory abnormality was more prevalent in patients with heart failure with reduced ejection fraction with PH than those without. However, such ventilatory defects were related to long‐term survival only in patients without PH, regardless of their functional status.
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Affiliation(s)
- Hao-Chih Chang
- Department of Medicine Taipei Veterans General Hospital Yuanshan and Suao Branch Yilan Taiwan.,Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan
| | - Wei-Ming Huang
- Department of Medicine National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan
| | - Wen-Chung Yu
- Department of Medicine National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan.,Cardiovascular Research Center National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan
| | - Hao-Min Cheng
- Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan.,Cardiovascular Research Center National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Center for Evidence-Based Medicine Taipei Veterans General Hospital Taipei Taiwan.,Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan.,Institute of Public Health National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan
| | - Chao-Yu Guo
- Institute of Public Health National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan
| | - Chern-En Chiang
- Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan.,Cardiovascular Research Center National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,General Clinical Research Center Taipei Veterans General Hospital Taipei Taiwan
| | - Chen-Huan Chen
- Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan.,Cardiovascular Research Center National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Department of Medical Education Taipei Veterans General Hospital Taipei Taiwan
| | - Shih-Hsien Sung
- Department of Medicine National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Division of Cardiology Department of Medicine Taipei Veterans General Hospital Taipei Taiwan.,Cardiovascular Research Center National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan.,Institute of Emergency and Critical Care Medicine National Yang Ming Chiao Tung University College of Medicine Taipei Taiwan
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3
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Neder JA, Berton DC, Phillips DB, O'Donnell DE. Exertional ventilation/carbon dioxide output relationship in COPD: from physiological mechanisms to clinical applications. Eur Respir Rev 2021; 30:30/161/200190. [PMID: 34526312 PMCID: PMC9489189 DOI: 10.1183/16000617.0190-2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Accepted: 09/30/2020] [Indexed: 01/09/2023] Open
Abstract
There is well established evidence that the minute ventilation (V′E)/carbon dioxide output (V′CO2) relationship is relevant to a number of patient-related outcomes in COPD. In most circumstances, an increased V′E/V′CO2 reflects an enlarged physiological dead space (“wasted” ventilation), although alveolar hyperventilation (largely due to increased chemosensitivity) may play an adjunct role, particularly in patients with coexistent cardiovascular disease. The V′E/V′CO2 nadir, in particular, has been found to be an important predictor of dyspnoea and poor exercise tolerance, even in patients with largely preserved forced expiratory volume in 1 s. As the disease progresses, a high nadir might help to unravel the cause of disproportionate breathlessness. When analysed in association with measurements of dynamic inspiratory constraints, a high V′E/V′CO2 is valuable to ascertain a role for the “lungs” in limiting dyspnoeic patients. Regardless of disease severity, cardiocirculatory (heart failure and pulmonary hypertension) and respiratory (lung fibrosis) comorbidities can further increase V′E/V′CO2. A high V′E/V′CO2 is a predictor of poor outcome in lung resection surgery, adding value to resting lung hyperinflation in predicting all-cause and respiratory mortality across the spectrum of disease severity. Considering its potential usefulness, the V′E/V′CO2 should be valued in the clinical management of patients with COPD. The minute ventilation/carbon dioxide production relationship is relevant to a number of patient-related outcomes in COPD. Minute ventilation/carbon dioxide production, therefore, should be valued in the clinical management of these patients.https://bit.ly/3df2upH
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Affiliation(s)
- J Alberto Neder
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada
| | - Danilo C Berton
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada.,Division of Respiratory Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Devin B Phillips
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada
| | - Denis E O'Donnell
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada
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4
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Oakland HT, Joseph P, Elassal A, Cullinan M, Heerdt PM, Singh I. Diagnostic utility of sub-maximum cardiopulmonary exercise testing in the ambulatory setting for heart failure with preserved ejection fraction. Pulm Circ 2020; 10:2045894020972273. [PMID: 33282205 PMCID: PMC7691918 DOI: 10.1177/2045894020972273] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Accepted: 10/17/2020] [Indexed: 12/04/2022] Open
Abstract
Pulmonary hypertension is commonly associated with heart failure with preserved
ejection fraction. In heart failure with preserved ejection fraction, the
elevated left-sided filling pressures result in isolated post-capillary
pulmonary hypertension or combined pre- and post-capillary pulmonary
hypertension. Although right heart catheterization is the gold standard for
diagnosis, it is an invasive test with associated risks. The ability of
sub-maximum cardiopulmonary exercise test as an adjunct diagnostic tool in
pulmonary hypertension-associated heart failure with preserved ejection fraction
is not known. Forty-six patients with heart failure with preserved ejection
fraction and pulmonary hypertension (27 patients with combined pre- and
post-capillary pulmonary hypertension and 19 patients with isolated
post-capillary pulmonary hypertension) underwent sub-maximum cardiopulmonary
exercise test followed by right heart catheterization. The study also included
18 age- and gender-matched control subjects. Several sub-maximum gas exchange
parameters were examined to determine the ability of sub-maximum cardiopulmonary
exercise test to distinguish between isolated post-capillary pulmonary
hypertension and combined pre- and post-capillary pulmonary hypertension.
Conventional echocardiogram measures did not distinguish between isolated
post-capillary pulmonary hypertension and combined pre- and post-capillary
pulmonary hypertension. Compared to isolated post-capillary pulmonary
hypertension, combined pre- and post-capillary pulmonary hypertension had
greater ventilatory equivalent for carbon dioxide (VE/VCO2) slope,
reduced delta end-tidal CO2 change during exercise, reduced oxygen
uptake efficiency slope, and reduced gas exchange determined pulmonary vascular
capacitance. The latter was significantly associated with right heart
catheterization determined pulmonary artery compliance
(r = 0.5; p = 0.0004). On univariate analysis,
sub-maximum VE/VCO2, delta end-tidal carbon dioxide, and gas exchange
determined pulmonary vascular capacitance emerged as independent predictors of
the extrapolated maximum oxygen uptake (%predicted) (β-coefficient values of
–7.32, 95% CI: –13.3 – (–1.32), p = 0.01; 8.01, 95% CI:
1.96–14.05, p = 0.01; 8.78, 95% CI: 2.26–15.29,
p = 0.01, respectively). Sub-maximum gas exchange
parameters obtained during cardiopulmonary exercise test in an ambulatory
setting allows for discrimination between isolated post-capillary pulmonary
hypertension and combined pre- and post-capillary pulmonary hypertension.
Additionally, sub-maximum cardiopulmonary exercise test derived
VE/VCO2, delta end-tidal carbon dioxide, and gas exchange
determined pulmonary vascular capacitance influences aerobic capacity in heart
failure with preserved ejection fraction.
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Affiliation(s)
- Hannah T Oakland
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Yale New Haven Hospital and Yale School of Medicine, New Haven, CT, USA
| | - Phillip Joseph
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Yale New Haven Hospital and Yale School of Medicine, New Haven, CT, USA
| | - Ahmed Elassal
- Department of Anesthesiology, Yale New Haven Hospital and Yale School of Medicine, New Haven, CT, USA
| | - Marjorie Cullinan
- Department of Respiratory Care, Yale New Haven Hospital, New Haven, CT, USA
| | - Paul M Heerdt
- Department of Anesthesiology, Yale New Haven Hospital and Yale School of Medicine, New Haven, CT, USA
| | - Inderjit Singh
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, Yale New Haven Hospital and Yale School of Medicine, New Haven, CT, USA
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5
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Gas Exchange and Ventilatory Efficiency During Exercise in Pulmonary Vascular Diseases. Arch Bronconeumol 2020; 56:578-585. [DOI: 10.1016/j.arbres.2019.12.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 12/16/2019] [Accepted: 12/22/2019] [Indexed: 12/31/2022]
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6
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Cross TJ, Kim CH, Johnson BD, Lalande S. The interactions between respiratory and cardiovascular systems in systolic heart failure. J Appl Physiol (1985) 2019; 128:214-224. [PMID: 31774354 DOI: 10.1152/japplphysiol.00113.2019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Heart failure (HF) is a complex and multifaceted disease. The disease affects multiple organ systems, including the respiratory system. This review provides three unique examples illustrating how the cardiovascular and respiratory systems interrelate because of the pathology of HF. Specifically, these examples outline the impact of HF pathophysiology on 1) respiratory mechanics and the mechanical "cost" of breathing; 2) mechanical interactions of the heart and lungs; and on 3) abnormalities of pulmonary gas exchange during exercise, and how this may be applied to treatment. The goal of this review is to, therefore, raise the awareness that HF, though primarily a disease of the heart, is accompanied by marked pathology of the respiratory system.
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Affiliation(s)
- Troy James Cross
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester Minnesota
| | - Chul-Ho Kim
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester Minnesota
| | - Bruce D Johnson
- Department of Cardiovascular Diseases, Mayo Clinic, Rochester Minnesota
| | - Sophie Lalande
- Department of Kinesiology and Heath Education, University of Texas at Austin, Austin, Texas
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7
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Dead space fractions in neonates following first-stage palliation for hypoplastic left heart syndrome. Cardiol Young 2019; 29:481-487. [PMID: 30992091 DOI: 10.1017/s1047951119000076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
PURPOSE (1) To characterise changes in dead space fraction during the first 120 post-operative hours in neonates undergoing stage 1 palliation for hypoplastic left heart syndrome, including hybrid procedure; (2) to document whether dead space fraction varied by shunt type (Blalock-Taussig shunt and Sano) and hybrid procedure; and (3) to determine the association between dead space fraction and outcomes. METHODS Retrospective chart review in neonates undergoing stage 1 palliation for hypoplastic left heart syndrome in a cardiac intensive care unit over a consecutive 30-month period. A linear mixed model was used to determine the differences in dead space over time. Multivariable linear regression and a multivariable linear mixed model were used to assess the association between dead space and outcomes at different time points and over time, respectively. RESULTS Thirty-four neonates received either a Blalock-Taussig shunt (20.5%), Sano shunt (59%), or hybrid procedure (20.5%). Hospital mortality was 8.8%. Dead space fractions in patients undergoing the hybrid procedure were significantly lower on day 1 (p = 0.01) and day 2 (p = 0.02) and increased over time. A dead space fraction >0.6 on post-operative days 3-5 was significantly associated with decreased duration of mechanical ventilation in all surgical groups (p 0.6 on post-operative days 3-5 was associated with lower duration of mechanical ventilation in all surgical groups. A more comprehensive, prospective assessment of dead space in this delicate patient population would likely be beneficial in improving outcomes.
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8
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Naughton MT. PRO: Persistent Central Sleep Apnea/Hunter-Cheyne-Stokes Breathing, Despite Best Guideline-Based Therapy of Heart Failure With Reduced Ejection Fraction, Is a Compensatory Mechanism and Should Not Be Suppressed. J Clin Sleep Med 2018; 14:909-914. [PMID: 29860966 DOI: 10.5664/jcsm.7146] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 03/16/2018] [Indexed: 12/27/2022]
Affiliation(s)
- Matthew T Naughton
- Department of Respiratory Medicine, Alfred Hospital and Monash University, Melbourne, Victoria, Australia
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9
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Clini EM, Beghé B, Fabbri LM. What is the origin of dyspnoea in smokers without airway disease? Eur Respir J 2018; 48:604-7. [PMID: 27581401 DOI: 10.1183/13993003.01170-2016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 06/14/2016] [Indexed: 01/23/2023]
Affiliation(s)
- Enrico M Clini
- Dept of Medical and Surgical Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Bianca Beghé
- Dept of Medical and Surgical Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Leonardo M Fabbri
- Dept of Medicine, Endocrinology, Geriatrics and Metabolism - Sant'Agostino Estense Hospital, University of Modena and Reggio Emilia, Modena, Italy
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10
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Guazzi M. Adjusting exercise ventilation efficiency for age: A step forward for optimizing prediction of outcome especially in heart failure with preserved ejection fraction. Eur J Prev Cardiol 2018; 25:728-730. [PMID: 29547008 DOI: 10.1177/2047487318763944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Marco Guazzi
- University of Milano, Cardiology University Department, Heart Failure Unit, IRCCS Policlinico San Donato, San Donato Milanese, Italy
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11
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Weatherald J, Sattler C, Garcia G, Laveneziana P. Ventilatory response to exercise in cardiopulmonary disease: the role of chemosensitivity and dead space. Eur Respir J 2018; 51:51/2/1700860. [PMID: 29437936 DOI: 10.1183/13993003.00860-2017] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Accepted: 11/11/2017] [Indexed: 12/30/2022]
Abstract
The lungs and heart are irrevocably linked in their oxygen (O2) and carbon dioxide (CO2) transport functions. Functional impairment of the lungs often affects heart function and vice versa The steepness with which ventilation (V'E) rises with respect to CO2 production (V'CO2 ) (i.e. the V'E/V'CO2 slope) is a measure of ventilatory efficiency and can be used to identify an abnormal ventilatory response to exercise. The V'E/V'CO2 slope is a prognostic marker in several chronic cardiopulmonary diseases independent of other exercise-related variables such as peak O2 uptake (V'O2 ). The V'E/V'CO2 slope is determined by two factors: 1) the arterial CO2 partial pressure (PaCO2 ) during exercise and 2) the fraction of the tidal volume (VT) that goes to dead space (VD) (i.e. the physiological dead space ratio (VD/VT)). An altered PaCO2 set-point and chemosensitivity are present in many cardiopulmonary diseases, which influence V'E/V'CO2 by affecting PaCO2 Increased ventilation-perfusion heterogeneity, causing inefficient gas exchange, also contributes to the abnormal V'E/V'CO2 observed in cardiopulmonary diseases by increasing VD/VT During cardiopulmonary exercise testing, the PaCO2 during exercise is often not measured and VD/VT is only estimated by taking into account the end-tidal CO2 partial pressure (PETCO2 ); however, PaCO2 is not accurately estimated from PETCO2 in patients with cardiopulmonary disease. Measuring arterial gases (PaO2 and PaCO2 ) before and during exercise provides information on the real (and not "estimated") VD/VT coupled with a true measure of gas exchange efficiency such as the difference between alveolar and arterial O2 partial pressure and the difference between arterial and end-tidal CO2 partial pressure during exercise.
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Affiliation(s)
- Jason Weatherald
- Dept of Medicine, Division of Respiratory Medicine, University of Calgary, Calgary, AB, Canada.,Université Paris-Sud and Université Paris-Saclay, Le Kremlin-Bicêtre, France.,Service de Pneumologie, AP-HP, Hôpital Bicêtre, Le Kremlin-Bicêtre, France.,Libin Cardiovascular Institute of Alberta, Calgary, AB, Canada
| | - Caroline Sattler
- Université Paris-Sud and Université Paris-Saclay, Le Kremlin-Bicêtre, France.,Service de Pneumologie, AP-HP, Hôpital Bicêtre, Le Kremlin-Bicêtre, France
| | - Gilles Garcia
- Université Paris-Sud and Université Paris-Saclay, Le Kremlin-Bicêtre, France.,Service de Pneumologie, AP-HP, Hôpital Bicêtre, Le Kremlin-Bicêtre, France.,These authors contributed equally to this work and are both last authors
| | - Pierantonio Laveneziana
- Sorbonne Universités, UPMC Université Paris 06, INSERM, UMRS_1158 Neurophysiologie Respiratoire Expérimentale et Clinique, Paris, France .,Service des Explorations Fonctionnelles de la Respiration, de l'Exercice et de la Dyspnée, Dépt "R3S", Pôle PRAGUES, AP-HP, Groupe Hospitalier Pitié-Salpêtrière Charles Foix, Paris, France.,These authors contributed equally to this work and are both last authors
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12
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Barn P, Giles L, Héroux ME, Kosatsky T. A review of the experimental evidence on the toxicokinetics of carbon monoxide: the potential role of pathophysiology among susceptible groups. Environ Health 2018; 17:13. [PMID: 29402286 PMCID: PMC5800074 DOI: 10.1186/s12940-018-0357-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 01/26/2018] [Indexed: 06/07/2023]
Abstract
BACKGROUND Acute high level carbon monoxide (CO) exposure can cause immediate cardio-respiratory arrest in anyone, but the effects of lower level exposures in susceptible persons are less well known. The percentage of CO-bound hemoglobin in blood (carboxyhemoglobin; COHb) is a marker of exposure and potential health outcomes. Indoor air quality guidelines developed by the World Health Organization and Health Canada, among others, are set so that CO exposure does not lead to COHb levels above 2.0%, a target based on experimental evidence on toxicodynamic relationships between COHb and cardiac performance among persons with cardiovascular disease (CVD). The guidelines do not consider the role of pathophysiological influences on toxicokinetic relationships. Physiological deficits that contribute to increased CO uptake, decreased CO elimination, and increased COHb formation can alter relationships between CO exposures and resulting COHb levels, and consequently, the severity of outcomes. Following three fatalities attributed to CO in a long-term care facility (LTCF), we queried whether pathologies other than CVD could alter CO-COHb relationships. Our primary objective was to inform susceptibility-specific modeling that accounts for physiological deficits that may alter CO-COHb relationships, ultimately to better inform CO management in LTCFs. METHODS We reviewed experimental studies investigating relationships between CO, COHb, and outcomes related to health or physiological outcomes among healthy persons, persons with CVD, and six additional physiologically susceptible groups considered relevant to LTCF residents: persons with chronic obstructive pulmonary disease (COPD), anemia, cerebrovascular disease (CBD), heart failure, multiple co-morbidities, and persons of older age (≥ 60 years). RESULTS We identified 54 studies published since 1946. Six studies investigated toxicokinetics among healthy persons, and the remaining investigated toxicodynamics, mainly among healthy persons and persons with CVD. We identified one study each of CO dynamics in persons with COPD, anemia and persons of older age, and no studies of persons with CBD, heart failure, or multiple co-morbidities. Considerable heterogeneity existed for exposure scenarios and outcomes investigated. CONCLUSIONS Limited experimental human evidence on the effects of physiological deficits relevant to CO kinetics exists to support indoor air CO guidelines. Both experimentation and modeling are needed to assess how physiological deficits influence the CO-COHb relationship, particularly at sub-acute exposures relevant to indoor environments. Such evidence would better inform indoor air quality guidelines and CO management in indoor settings where susceptible groups are housed.
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Affiliation(s)
- Prabjit Barn
- National Collaborating Centre for Environmental Health, 200 - 601 West Broadway, Vancouver, BC V5Z 4C2 Canada
- Environmental Health Services, British Columbia Centre for Disease Control, 655 West 12th Avenue, Vancouver, BC V5Z 4R4 Canada
| | - Luisa Giles
- National Collaborating Centre for Environmental Health, 200 - 601 West Broadway, Vancouver, BC V5Z 4C2 Canada
- Currently at: Department of Sport Science, Douglas College, P.O. Box 2503, 700 Royal Avenue, New Westminster, BC V3L 5B2 Canada
| | - Marie-Eve Héroux
- Water and Air Quality Bureau, Health Canada, 269 Laurier Ave West, Ottawa, K1A 0K9 Canada
| | - Tom Kosatsky
- National Collaborating Centre for Environmental Health, 200 - 601 West Broadway, Vancouver, BC V5Z 4C2 Canada
- Environmental Health Services, British Columbia Centre for Disease Control, 655 West 12th Avenue, Vancouver, BC V5Z 4R4 Canada
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13
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Guazzi M, Bandera F, Ozemek C, Systrom D, Arena R. Cardiopulmonary Exercise Testing: What Is its Value? J Am Coll Cardiol 2017; 70:1618-1636. [PMID: 28935040 DOI: 10.1016/j.jacc.2017.08.012] [Citation(s) in RCA: 264] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 08/02/2017] [Indexed: 02/07/2023]
Abstract
Compared with traditional exercise tests, cardiopulmonary exercise testing (CPET) provides a thorough assessment of exercise integrative physiology involving the pulmonary, cardiovascular, muscular, and cellular oxidative systems. Due to the prognostic ability of key variables, CPET applications in cardiology have grown impressively to include all forms of exercise intolerance, with a predominant focus on heart failure with reduced or with preserved ejection fraction. As impaired cardiac output and peripheral oxygen diffusion are the main determinants of the abnormal functional response in cardiac patients, invasive CPET has gained new popularity, especially for diagnosing early heart failure with preserved ejection fraction and exercise-induced pulmonary hypertension. The most impactful advance has recently come from the introduction of CPET combined with echocardiography or CPET imaging, which provides basic information regarding cardiac and valve morphology and function. This review highlights modern CPET use as a single or combined test that allows the pathophysiological bases of exercise limitation to be translated, quite easily, into clinical practice.
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Affiliation(s)
- Marco Guazzi
- University of Milan, Cardiology University Department, Heart Failure Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy.
| | - Francesco Bandera
- University of Milan, Cardiology University Department, Heart Failure Unit, IRCCS Policlinico San Donato, San Donato Milanese, Milan, Italy
| | - Cemal Ozemek
- Department of Physical Therapy, Department of Kinesiology and Nutrition, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, Illinois
| | - David Systrom
- Division of Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts; Heart and Vascular Center, Brigham and Women's Hospital, Boston, Massachusetts
| | - Ross Arena
- Department of Physical Therapy, Department of Kinesiology and Nutrition, College of Applied Health Sciences, University of Illinois at Chicago, Chicago, Illinois
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14
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Magnussen H, Canepa M, Zambito PE, Brusasco V, Meinertz T, Rosenkranz S. What can we learn from pulmonary function testing in heart failure? Eur J Heart Fail 2017; 19:1222-1229. [DOI: 10.1002/ejhf.946] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 06/06/2017] [Accepted: 06/26/2017] [Indexed: 12/28/2022] Open
Affiliation(s)
- Helgo Magnussen
- Pulmonary Research Institute at Lung Clinic Grosshansdorf and Airway Research Center North; Member of the German Center for Lung Research; Grosshansdorf Germany
| | - Marco Canepa
- Department of Internal Medicine and Medical Specialties; University of Genoa, San Martino Hospital; Genoa Italy
| | | | - Vito Brusasco
- Department of Internal Medicine and Medical Specialties; University of Genoa, San Martino Hospital; Genoa Italy
| | | | - Stephan Rosenkranz
- Klinik III für Innere Medizin, Herzzentrum der Universität zu Köln, Cologne, and Cologne Cardiovascular Research Center (CCRC); Heart Center at the University of Cologne; Cologne Germany
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15
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Neder JA, Berton DC, Arbex FF, Alencar MC, Rocha A, Sperandio PA, Palange P, O'Donnell DE. Physiological and clinical relevance of exercise ventilatory efficiency in COPD. Eur Respir J 2017; 49:49/3/1602036. [PMID: 28275174 DOI: 10.1183/13993003.02036-2016] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 12/12/2016] [Indexed: 01/09/2023]
Abstract
Exercise ventilation (V'E) relative to carbon dioxide output (V'CO2 ) is particularly relevant to patients limited by the respiratory system, e.g. those with chronic obstructive pulmonary disease (COPD). High V'E-V'CO2 (poor ventilatory efficiency) has been found to be a key physiological abnormality in symptomatic patients with largely preserved forced expiratory volume in 1 s (FEV1). Establishing an association between high V'E-V'CO2 and exertional dyspnoea in mild COPD provides evidence that exercise intolerance is not a mere consequence of detraining. As the disease evolves, poor ventilatory efficiency might help explaining "out-of-proportion" breathlessness (to FEV1 impairment). Regardless, disease severity, cardiocirculatory co-morbidities such as heart failure and pulmonary hypertension have been found to increase V'E-V'CO2 In fact, a high V'E-V'CO2 has been found to be a powerful predictor of poor outcome in lung resection surgery. Moreover, a high V'E-V'CO2 has added value to resting lung hyperinflation in predicting all-cause and respiratory mortality across the spectrum of COPD severity. Documenting improved ventilatory efficiency after lung transplantation and lung volume reduction surgery provides objective evidence of treatment efficacy. Considering the usefulness of exercise ventilatory efficiency in different clinical scenarios, the V'E-V'CO2 relationship should be valued in the interpretation of cardiopulmonary exercise tests in patients with mild-to-end-stage COPD.
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Affiliation(s)
- J Alberto Neder
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada
| | - Danilo C Berton
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada.,Division of Respiratory Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Flavio F Arbex
- Pulmonary Function and Clinical Exercise Physiology, Respiratory Division, Federal University of Sao Paulo, Sao Paulo, Brazil
| | - Maria Clara Alencar
- Division of Cardiology, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Alcides Rocha
- Pulmonary Function and Clinical Exercise Physiology, Respiratory Division, Federal University of Sao Paulo, Sao Paulo, Brazil
| | - Priscila A Sperandio
- Pulmonary Function and Clinical Exercise Physiology, Respiratory Division, Federal University of Sao Paulo, Sao Paulo, Brazil
| | - Paolo Palange
- Dept of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy
| | - Denis E O'Donnell
- Respiratory Investigation Unit and Laboratory of Clinical Exercise Physiology, Queen's University and Kingston General Hospital, Kingston, ON, Canada
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16
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Kee K, Stuart-Andrews C, Ellis MJ, Wrobel JP, Nilsen K, Thompson BR, Naughton MT. Reply: Can Dead Space Ventilation Really Be Measured without PaCO2? Am J Respir Crit Care Med 2016; 194:1556-1557. [DOI: 10.1164/rccm.201607-1336le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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17
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Plantier L, Delclaux C. Can Dead Space Ventilation Really Be Measured without PaCO2? Am J Respir Crit Care Med 2016; 194:1555-1556. [DOI: 10.1164/rccm.201606-1146le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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18
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Kee K, Stuart-Andrews C, Ellis MJ, Wrobel JP, Nilsen K, Thompson BR, Naughton MT. Reply: Dyspnea in Heart Failure: A Multiheaded Beast. Am J Respir Crit Care Med 2016; 194:775-6. [DOI: 10.1164/rccm.201604-0837le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Kirk Kee
- The AlfredMelbourne, Victoria, Australiaand
- Monash UniversityMelbourne, Victoria, Australia
| | | | | | - Jeremy P. Wrobel
- The AlfredMelbourne, Victoria, Australiaand
- Monash UniversityMelbourne, Victoria, Australia
| | - Kris Nilsen
- Monash UniversityMelbourne, Victoria, Australia
| | - Bruce R. Thompson
- The AlfredMelbourne, Victoria, Australiaand
- Monash UniversityMelbourne, Victoria, Australia
| | - Matthew T. Naughton
- The AlfredMelbourne, Victoria, Australiaand
- Monash UniversityMelbourne, Victoria, Australia
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19
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Robertson HT, Swenson ER. True and True, but Not Causally Related. Am J Respir Crit Care Med 2016; 194:774-5. [DOI: 10.1164/rccm.201604-0667le] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
| | - Erik R. Swenson
- Veterans Affairs Puget Sound Health Care SystemSeattle, Washington
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20
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Glanville AR, Hoeper MM. Don't Let (Dl)CO Be Misunderstood. Am J Respir Crit Care Med 2016; 193:1200-1. [PMID: 27248589 DOI: 10.1164/rccm.201601-0079ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Allan R Glanville
- 1 The Lung Transplant Unit St. Vincent's Hospital Sydney, New South Wales, Australia and
| | - Marius M Hoeper
- 2 Department of Respiratory Medicine and German Center for Lung Research Hannover Medical School Hannover, Germany
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