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Causer AJ, Shute JK, Cummings MH, Shepherd AI, Wallbanks SR, Pulsford RM, Bright V, Connett G, Saynor ZL. Elexacaftor-Tezacaftor-Ivacaftor improves exercise capacity in adolescents with cystic fibrosis. Pediatr Pulmonol 2022; 57:2652-2658. [PMID: 35851858 PMCID: PMC9795914 DOI: 10.1002/ppul.26078] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 06/14/2022] [Accepted: 06/25/2022] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Elexacaftor/Tezacaftor/Ivacaftor is a cystic fibrosis transmembrane conductance regulator (CFTR) modulator with the potential to improve exercise capacity. This case series of three adolescents with CF aimed to investigate whether 6 weeks treatment with Elexacaftor/Tezacaftor/Ivacaftor could improve exercise capacity in CFTR modulator naive adolescents with CF. METHODS Three adolescents (14.0 ± 1.4 years) with CF (FEV1 % predicted: 62.5 ± 17.1; F508del/F508del genotype) completed an exhaustive maximal cardiopulmonary exercise test on a cycle ergometer to determine peak oxygen uptake ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:mover><mml:mi>V</mml:mi> <mml:mo>̇</mml:mo></mml:mover> </mml:mrow> <mml:annotation>$\dot{{\rm{V}}}$</mml:annotation></mml:semantics> </mml:math> O2peak ) and measure changes in gas exchange and ventilation during exercise at 6 weeks. We also analyzed wrist-worn device-based physical activity (PA) data in two of the three cases. Validated acceleration thresholds were used to quantify time spent in each PA intensity category. RESULTS Clinically meaningful improvements in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:mover><mml:mi>V</mml:mi> <mml:mo>̇</mml:mo></mml:mover> </mml:mrow> <mml:annotation>$\dot{{\rm{V}}}$</mml:annotation></mml:semantics> </mml:math> O2peak were observed in all three cases (+17.6%, +52.4%, and +32.9%, respectively), with improvements greatest in those with more severe lung disease and lower fitness at baseline. Although lung function increased in all cases, inconsistent changes in markers of ventilatory and peripheral muscle efficiency likely suggest different mechanisms of improvement in this case group of adolescents with CF. Device-based analysis of PA was variable, with one case increasing and one case decreasing. CONCLUSION In this case series, we have observed, for the first time, improvements in exercise capacity following 6 weeks of treatment with Elexacaftor/Tezacaftor/Ivacaftor. Improvements were greatest in the presence of more severe CF lung disease and lower aerobic fitness at baseline. The mechanism(s) responsible for these changes warrant further investigation in larger trials.
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Affiliation(s)
- Adam J Causer
- School of Sport, Health and Exercise Science, Faculty of Science and Health, University of Portsmouth, Portsmouth, UK.,Cystic Fibrosis Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Janis K Shute
- School of Pharmacy and Biomedical Sciences, Faculty of Science and Health, University of Portsmouth, Portsmouth, UK
| | - Michael H Cummings
- Department of Diabetes and Endocrinology, Queen Alexandra Hospital, Portsmouth, UK
| | - Anthony I Shepherd
- School of Sport, Health and Exercise Science, Faculty of Science and Health, University of Portsmouth, Portsmouth, UK
| | - Samuel R Wallbanks
- School of Sport, Health and Exercise Science, Faculty of Science and Health, University of Portsmouth, Portsmouth, UK
| | - Richard M Pulsford
- Sport and Health Sciences, College of Life and Environmental Science, University of Exeter, Exeter, UK
| | - Victoria Bright
- Cystic Fibrosis Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK
| | - Gary Connett
- Cystic Fibrosis Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK.,National Institute for Health Research, Southampton Biomedical Research Centre, Southampton Children's Hospital, Southampton, UK
| | - Zoe L Saynor
- School of Sport, Health and Exercise Science, Faculty of Science and Health, University of Portsmouth, Portsmouth, UK.,Cystic Fibrosis Unit, University Hospital Southampton NHS Foundation Trust, Southampton, UK
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Burghard M, Takken T, Nap-van der Vlist MM, Nijhof SL, van der Ent CK, Heijerman HGM, Hulzebos HJE. Physiological predictors of cardiorespiratory fitness in children and adolescents with cystic fibrosis without ventilatory limitation. Ther Adv Respir Dis 2022; 16:17534666211070143. [PMID: 35012387 PMCID: PMC8755930 DOI: 10.1177/17534666211070143] [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] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Objectives: [1] To investigate the cardiorespiratory fitness (CRF) levels in children and
adolescents with cystic fibrosis (CF) with no ventilatory limitation
(ventilatory reserve ⩾ 15%) during exercise, and [2] to assess which
physiological factors are related to CRF. Methods: A cross-sectional study design was used in 8- to 18-year-old children and
adolescents with CF. Cardiopulmonary exercise testing was used to determine
peak oxygen uptake normalized to body weight as a measure of CRF. Patients
were defined as having ‘low CRF’ when CRF was less than 82%predicted.
Physiological predictors used in this study were body mass index z-score,
P. Aeruginosa lung infection, impaired glucose
tolerance (IGT) including CF-related diabetes, CF-related liver disease,
sweat chloride concentration, and self-reported physical activity. Backward
likelihood ratio (LR) logistic regression analysis was used. Results: Sixty children and adolescents (51.7% boys) with a median age of 15.3 years
(25th–75th percentile: 12.9–17.0 years) and a mean percentage predicted
forced expiratory volume in 1 second of 88.5% (±16.9) participated. Mean
percentage predicted CRF (ppVO2peak/kg) was 81.4% (±12.4, range:
51%–105%). Thirty-three patients (55.0%) were classified as having ‘low
CRF’. The final model that best predicted low CRF included IGT
(p = 0.085; Exp(B) = 6.770) and P.
Aeruginosa lung infection (p = 0.095; Exp(B) = 3.945). This
model was able to explain between 26.7% and 35.6% of variance. Conclusions: CRF is reduced in over half of children and adolescents with CF with normal
ventilatory reserve. Glucose intolerance and P. Aeruginosa
lung infection seem to be associated to low CRF in children and adolescents
with CF.
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Affiliation(s)
- Marcella Burghard
- Child Development, Exercise, and Physical Literacy Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, P.O. Box 85090, 3508 EA Utrecht, The Netherlands.,Cystic Fibrosis Center Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Tim Takken
- Child Development, Exercise, and Physical Literacy Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Merel M Nap-van der Vlist
- Department of Social Pediatrics, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sanne L Nijhof
- Department of Social Pediatrics, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - C Kors van der Ent
- Cystic Fibrosis Center Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands.,Department of Pediatric Pulmonology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Harry G M Heijerman
- Cystic Fibrosis Center Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands.,Division Heart and Lung, Department of Pulmonology, Cystic Fibrosis Center Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands
| | - H J Erik Hulzebos
- Child Development, Exercise, and Physical Literacy Center, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands.,Cystic Fibrosis Center Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands
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3
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Caterini JE, Ratjen F, Barker AR, Williams CA, Rendall K, Schneiderman JE, Wells GD. Exercise intolerance in cystic fibrosis-the role of CFTR modulator therapies. J Cyst Fibros 2021; 21:282-292. [PMID: 34955387 DOI: 10.1016/j.jcf.2021.11.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 10/18/2021] [Accepted: 11/20/2021] [Indexed: 12/11/2022]
Abstract
Exercise intolerance is common in people with CF (pwCF), but not universal among all individuals. While associated with disease prognosis, exercise intolerance is not simply a reflection of the degree of lung disease. In people with severe CF, respiratory limitations may contribute more significantly to impaired exercise capacity than in those with mild-moderate CF. At all levels of disease severity, there are peripheral factors e.g., abnormal macro- and micro-vascular function that impair blood flow and reduce oxygen extraction, and mitochondrial defects that diminish metabolic efficiency. We discuss advances in understanding the central and peripheral mechanisms underlying exercise intolerance in pwCF. Exploring both the central and peripheral factors that contribute to exercise intolerance in CF can help inform the development of new therapeutic targets, as well as help define prognostic criteria.
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Affiliation(s)
- Jessica E Caterini
- Translational Medicine Program, SickKids Research Institute, Toronto, ON M5G 0A4, Canada; Queen's Medical School, Kingston, ON K7L 3N6, Canada
| | - Felix Ratjen
- Translational Medicine Program, SickKids Research Institute, Toronto, ON M5G 0A4, Canada; Department of Pediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada; Division of Respiratory Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada
| | - Alan R Barker
- Children's Health and Exercise Research Centre, Sport and Health Sciences, University of Exeter, Exeter EX1 2LU, UK
| | - Craig A Williams
- Children's Health and Exercise Research Centre, Sport and Health Sciences, University of Exeter, Exeter EX1 2LU, UK
| | - Kate Rendall
- Translational Medicine Program, SickKids Research Institute, Toronto, ON M5G 0A4, Canada
| | - Jane E Schneiderman
- Division of Respiratory Medicine, The Hospital for Sick Children, University of Toronto, Toronto, ON M5G 1X8, Canada; Faculty of Kinesiology & Physical Education, University of Toronto, Toronto, ON M5S 1A1, Canada
| | - Greg D Wells
- Translational Medicine Program, SickKids Research Institute, Toronto, ON M5G 0A4, Canada.
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