Background: Peak oxygen uptake (peak Vo(2)) is an established integrative measurement of maximal exercise capacity in cardiovascular disease. After heart transplantation (HTx) peak Vo(2) remains reduced despite normal systolic left ventricular function, which highlights the relevance of diastolic function. In this study we aim to characterize the predictive significance of cardiac allograft diastolic function for peak Vo(2).
Methods: Peak Vo(2) was measured using a ramp protocol on a bicycle ergometer. Left ventricular (LV) diastolic function was assessed with tissue Doppler imaging sizing the velocity of the early (Ea) and late (Aa) apical movement of the mitral annulus, and conventional Doppler measuring early (E) and late (A) diastolic transmitral flow propagation. Correlation coefficients were calculated and linear regression models fitted.
Results: The post-transplant time interval of the 39 HTxs ranged from 0.4 to 20.1 years. The mean age of the recipients was 55 +/- 14 years and body mass index (BMI) was 25.4 +/- 3.9 kg/m(2). Mean LV ejection fraction was 62 +/- 4%, mean LV mass index 108 +/- 22 g/m(2) and mean peak Vo(2) 20.1 +/- 6.3 ml/kg/min. Peak Vo(2) was reduced in patients with more severe diastolic dysfunction (pseudonormal or restrictive transmitral inflow pattern), or when E/Ea was > or =10. Peak Vo(2) correlated with recipient age (r = -0.643, p < 0.001), peak heart rate (r = 0.616, p < 0.001) and BMI (r = -0.417, p = 0.008). Of all echocardiographic measurements, Ea (r = 0.561, p < 0.001) and Ea/Aa (r = 0.495, p = 0.002) correlated best. Multivariate analysis identified age, heart rate, BMI and Ea/Aa as independent predictors of peak Vo(2).
Conclusions: Diastolic dysfunction is relevant for the limitation of maximal exercise capacity after HTx.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.healun.2008.12.001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Application of Cardiac Rehabilitation Aerobic Exercise in Patients with Stable Angina in Coronary Heart Disease.
Br J Hosp Med (Lond)
January 2025
Department of Sports Arts, Hebei Sport University, Shijiazhuang, Hebei, China.
A novel exercise protocol for cardiac rehabilitation aerobic (CRA) has been developed by Hebei Sport University, demonstrating efficacy in patients with coronary heart disease (CHD). The objective of this study was to evaluate the impact of CRA on precise cardiac rehabilitation (CR) for CHD patients presenting with stable angina pectoris. The study cohort comprised patients with stable angina who were categorized into three groups: the CRA group (n = 35), the power bicycles (PB) group (n = 34), and the control group (n = 43).
View Article and Find Full Text PDFCardiopulmonary Impact of the Minimally Invasive Repair of Pectus Excavatum in Pediatric patients: A Prospective Pilot Study.
J Pediatr Surg
January 2025
Division of Pediatric Surgery, Department of Surgery, Phoenix Children's, Phoenix, AZ, USA; Department of Child Health and Development, University of Arizona, School of Medicine, Phoenix, AZ, USA.
Introduction: The physiologic benefits of the minimally invasive repair of pectus excavatum (MIRPE) on cardiopulmonary function are poorly understood in pediatrics. We sought to examine the effects of MIRPE on exercise response during cardiopulmonary exercise testing (CPET).
Methods: A prospective-pilot study was conduct of patients ≤18 years who presented for pectus bar removal.
The impact of a commercial lower extremity exoskeleton on metabolic load, perceived exertion, and physiological response to a challenging military relevant task: A randomized cross-over design pilot study.
PLoS One
January 2025
CFD Research Corporation, Huntsville, AL, United States of America.
Purpose: To assess physiological metrics during the use of a commercially available bilateral active ankle exoskeleton during a challenging military-relevant task and if use of the exoskeleton during this task influences: metabolic load, physiological measures or rate of perceived exertion.
Methods: Nine healthy volunteers (5M, 4F) completed this randomized cross-over design trial, with a baseline visit and two randomized test sessions (with/without the exoskeleton). Variables included impact on time to exhaustion during walking on a treadmill at varying speeds and gradients (0-15%) at 26.
Optimising investigative pathways in military medicine: operational impact of a military cardiopulmonary exercise testing clinic.
BMJ Mil Health
January 2025
Academic Department of Military Medicine, Royal Centre for Defence Medicine, Birmingham, UK
Introduction: Abnormal cardiorespiratory symptoms and investigative findings in service personnel typically result in prolonged investigation and occupational restriction. This analysis aimed to assess the impact of the xford ilitary Cardiopulmonary xercise Testing linic (OMEC), which investigates such symptoms and findings, on occupational recommendations.
Methods: A service evaluation was conducted on all OMEC attendances over a 5-year period.
Effect of Balloon-Dilated Restenosis on Exercise Performance and Cardiac Function in Children After Coarctation Repair.
Pediatr Cardiol
January 2025
Department of Cardiac Surgery, University Hospital of Gent, Corneel Heymanslaan 10, 9000, Ghent, Belgium.
Restenosis occurs commonly after aortic coarctation (CoA) repair, usually requiring treatment by balloon dilation. Its effect on physical exercise performance is not documented. A retrospective analysis of exercise testing and echocardiographic assessment was performed in children after CoA repair.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!