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The effect of exercise on large artery haemodynamics in cystic fibrosis
James H Hull1, Les Ansley, Charlotte E Bolton
1Faculty of Health and Social Care Sciences, Kingston University and St George's, London, UK. jiminio@doctors.org.uk
Background:
Adult patients with cystic fibrosis (CF) have resting abnormal large artery haemodynamics. Here, we obtain further insight in patients with CF by evaluating haemodynamic response to physiological stress.
Methods:
Thirty-six stable CF patients mean (SD) age 28.9 (9.0)years and 25 controls matched for age, gender and body mass index were studied. Central haemodynamic parameters; including augmentation index (AIx) and wasted left ventricular pressure energy (∆E(W)) were determined pre, during and post light intensity cycle ergometry.
Results:
During exercise, despite a similar heart rate and blood pressure, patients had comparatively greater ∆E(W) (P=0.03) and trend towards greater AIx (P=0.07) than controls. Exercise ∆E(W) was greatest in patients with CF related diabetes (n=11). In all subjects, exercise ∆E(W) was related to age (r=0.54, P<0.001) and FEV(1)% predicted (r=-0.32, P=0.01).
Conclusions:
Adults with CF have an abnormal haemodynamic response to exercise. This finding has deleterious implications for myocardial performance.
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