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Blanquez-Nadal M, Piliero N, Guillien A, Salvat M, Thony F, Augier C, Bouvaist H, Degano B. Neural respiratory drive in chronic thromboembolic pulmonary hypertension: Effect of balloon pulmonary angioplasty. Respir Physiol Neurobiol 2022; 299:103857. [PMID: 35121103 DOI: 10.1016/j.resp.2022.103857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 01/19/2022] [Accepted: 01/30/2022] [Indexed: 10/19/2022]
Abstract
Excessive ventilation (V̇E) during exercise, ascribed to heightened neural ventilatory drive and/or to increased "wasted" ventilation, is a feature of chronic thromboembolic pulmonary hypertension (CTEPH). In selected CTEPH patients, balloon pulmonary angioplasty (BPA) allows near-normalization of resting haemodynamic parameters but does not allow excess exercise hyperventilation to normalize. Neural ventilatory drive can be estimated by studying how arterial PCO2 (PaCO2), end-tidal PCO2 (PETCO2), V̇E and CO2 output (V̇CO2) change across the exercise-to-recovery transition during a cardiopulmonary exercise test. Increased "wasted" ventilation can be quantified by the physiological dead space fraction of tidal volume (VD/VT) calculated with the Enghoff simplification of the Bohr equation. These measurements were made before and after BPA in 22 CTEPH patients without significant cardiac and/or pulmonary comorbidities. Our observations suggest that before BPA, excessive hyperventilation was secondary to both heightened neural ventilatory drive and increased "wasted" ventilation; after BPA, measurements made across the exercise-to-recovery transition suggest that heightened neural ventilatory drive was no longer present.
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Affiliation(s)
- Mathilde Blanquez-Nadal
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France
| | - Nicolas Piliero
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Alicia Guillien
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Épidemiologie environnementale appliquée à la reproduction et à la santé respiratoire, INSERM, CNRS, Université Grenoble Alpes, Institut pour l'Avancée des Biosciences (IAB), U1209, Grenoble, France
| | - Muriel Salvat
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Frédéric Thony
- Pole Imagerie, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Caroline Augier
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Hélène Bouvaist
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Bruno Degano
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France; Laboratoire HP2, INSERM U1042, Université Grenoble Alpes, Grenoble, France.
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Blanquez-Nadal M, Piliero N, Guillien A, Doutreleau S, Salvat M, Thony F, Pison C, Augier C, Bouvaist H, Aguilaniu B, Degano B. Exercise hyperventilation and pulmonary gas exchange in chronic thromboembolic pulmonary hypertension: Effects of balloon pulmonary angioplasty. J Heart Lung Transplant 2021; 41:70-79. [PMID: 34742646 DOI: 10.1016/j.healun.2021.09.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 08/25/2021] [Accepted: 09/14/2021] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Excessive ventilation (V̇E) and abnormal gas exchange during exercise are features of chronic thromboembolic pulmonary hypertension (CTEPH). In selected CTEPH patients, balloon pulmonary angioplasty (BPA) improves symptoms and exercise capacity. How BPA affects exercise hyperventilation and gas exchange is poorly understood. METHODS In this longitudinal observational study, symptom-limited cardiopulmonary exercise tests and carbon monoxide lung diffusion (DLCO) were performed before and after BPA (interval, mean (SD): 3.1 (2.4) months) in 36 CTEPH patients without significant cardiac and/or pulmonary comorbidities. RESULTS Peak work rate improved by 20% after BPA whilst V̇E at peak did not change despite improved ventilatory efficiency (lower V̇E with respect to CO2 output [V̇CO2]). At the highest identical work rate pre- and post-BPA (75 (30) watts), V̇E and alveolar-arterial oxygen gradient (P(Ai-a)O2) decreased by 17% and 19% after BPA, respectively. The physiological dead space fraction of tidal volume (VD/VT), calculated from measurements of arterial and mixed expired CO2, decreased by 20%. In the meantime, DLCO did not change. The best correlates of P(Ai-a)O2 measured at peak exercise were physiological VD/VT before BPA and DLCO after BPA. CONCLUSIONS Ventilatory efficiency, physiological VD/VT, and pulmonary gas exchange improved after BPA. The fact that DLCO did not change suggests that the pulmonary capillary blood volume and probably the true alveolar dead space were unaffected by BPA. The correlation between DLCO measured before BPA and P(Ai-a)O2 measured after BPA suggests that DLCO may provide an easily accessible marker to predict the response to BPA in terms of pulmonary gas exchange.
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Affiliation(s)
- Mathilde Blanquez-Nadal
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France
| | - Nicolas Piliero
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Alicia Guillien
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Épidemiologie environnementale appliquée à la reproduction et à la santé respiratoire, INSERM, CNRS, Université Grenoble Alpes, Institut pour l'Avancée des Biosciences (IAB), Grenoble, France
| | - Stéphane Doutreleau
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France; Laboratoire HP2, INSERM U1042, Université Grenoble Alpes, Grenoble, France
| | - Muriel Salvat
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Frédéric Thony
- Pole Imagerie, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Christophe Pison
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France
| | - Caroline Augier
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Hélène Bouvaist
- Service de Cardiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France
| | - Bernard Aguilaniu
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France
| | - Bruno Degano
- Service Hospitalier Universitaire Pneumologie Physiologie, Pôle Thorax et Vaisseaux, Centre Hospitalier Universitaire Grenoble Alpes, Grenoble, France; Université Grenoble Alpes, Grenoble, France; Laboratoire HP2, INSERM U1042, Université Grenoble Alpes, Grenoble, France.
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Malenfant S, Brassard P, Paquette M, Le Blanc O, Chouinard A, Bonnet S, Provencher S. Continuous reduction in cerebral oxygenation during endurance exercise in patients with pulmonary arterial hypertension. Physiol Rep 2020; 8:e14389. [PMID: 32189447 PMCID: PMC7080869 DOI: 10.14814/phy2.14389] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 02/13/2020] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Patients with pulmonary arterial hypertension (PAH) have lower cerebral blood flow (CBF) and oxygenation compared to healthy sedentary subjects, the latter negatively correlating with exercise capacity during incremental cycling exercise. We hypothesized that patients would also exhibit altered CBF and oxygenation during endurance exercise, which would correlate with endurance time. METHODS Resting and exercise cardiorespiratory parameters, blood velocity in the middle cerebral artery (MCAv; transcranial doppler) and cerebral oxygenation (relative changes in cerebral tissue oxygenation index (ΔcTOI) and cerebral deoxyhemoglobin (ΔcHHb); near-infrared spectroscopy) were continuously monitored in nine PAH patients and 10 healthy-matched controls throughout endurance exercise. Cardiac output (CO), systemic blood pressure (BP) and oxygen saturation (SpO2 ), ventilatory metrics and end-tidal CO2 pressure (PET CO2 ) were also assessed noninvasively. RESULTS Despite a lower workload and endurance oxygen consumption, similar CO and systemic BP, ΔcTOI was lower in PAH patients compared to controls (p < .01 for interaction). As expected during exercise, patients were characterized by an altered MCAv response to exercise, a lower PET CO2 and SpO2 , as wells as a higher minute-ventilation/CO2 production ratio ( V ˙ E / V ˙ CO 2 ratio). An uncoupling between changes in MCAv and PET CO2 during the cycling endurance exercise was also progressively apparent in PAH patients, but absent in healthy controls. Both cHHb and ΔcTOI correlated with V ˙ E / V ˙ CO 2 ratio (r = 0.50 and r = -0.52; both p < .05 respectively), but not with endurance time. CONCLUSION PAH patients present an abnormal cerebrovascular profile during endurance exercise with a lower cerebral oxygenation that correlate with hyperventilation but not endurance exercise time. These findings complement the physiological characterization of the cerebral vascular responses to exercise in PAH patients.
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Affiliation(s)
- Simon Malenfant
- Pulmonary Hypertension and Vascular Biology Research GroupQuebec CityQCCanada
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of MedicineFaculty of MedicineUniversité LavalQuebec CityQCCanada
- Department of KinesiologyFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Patrice Brassard
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of KinesiologyFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Myriam Paquette
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of KinesiologyFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Olivier Le Blanc
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of KinesiologyFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Audrey Chouinard
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of KinesiologyFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Sébastien Bonnet
- Pulmonary Hypertension and Vascular Biology Research GroupQuebec CityQCCanada
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of MedicineFaculty of MedicineUniversité LavalQuebec CityQCCanada
| | - Steeve Provencher
- Pulmonary Hypertension and Vascular Biology Research GroupQuebec CityQCCanada
- Quebec Heart and Lung Institute Research CenterUniversité LavalQuebec CityQCCanada
- Department of MedicineFaculty of MedicineUniversité LavalQuebec CityQCCanada
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