Aims: To investigate the left ventricular response to exercise in young adults with hypertension, and identify whether this response can be predicted from changes in left atrial function at rest.
Methods: A total of 127 adults aged 18 to 40 years who completed clinical blood pressure assessment and echocardiography phenotyping at rest and during cardiopulmonary exercise testing, were included. Measurements were compared between participants with suboptimal blood pressure ≥120/80mmHg (n=68) and optimal blood pressure <120/80mmHg (n=59). Left ventricular systolic function during exercise was obtained from an apical four chamber view, while resting left atrial function was assessed from apical four and two chamber views.
Results: Participants with suboptimal blood pressure had higher left ventricular mass (p=0.031) and reduced mitral E velocity (p=0.02) at rest but no other cardiac differences. During exercise, their rise in left ventricular ejection fraction was reduced (p=0.001) and they had higher left ventricular end diastolic and systolic volumes (p=0.001, and p=0.001 respectively). Resting cardiac size predicted left ventricular volumes during exercise but only left atrial booster pump function predicted the left ventricular ejection fraction response (β=0.29, p=0.011). This association persisted after adjustment for age, sex, body mass index and mean arterial pressure.
Conclusion: Young adults with suboptimal blood pressure have a reduced left ventricular systolic response to exercise, which can be predicted by their left atrial booster pump function at rest. Echocardiographic measures of left atrial function may provide an early marker of functionally relevant, subclinical, cardiac remodelling in young adults with hypertension.
This work was funded by The British Heart Foundation (BHF) [BHF grant numbers PG/13/58/30397]; the Wellcome Trust [Ref 105741/Z/14/Z]; the Oxford BHF Centre for Research Excellence; and National Institute for Health Research (NIHR) Oxford Biomedical Research Centre and Oxford Health Services Research Committee (OHSRC). Maryam Alsharqi is funded by a scholarship grant from Imam Abdulrahman Bin Faisal University.
© 2021 The Authors. Echocardiography published by Wiley Periodicals LLC.
- SPS Exercise, Nutrition and Health Sciences
- Young adults
- exercise echocardiography
- exercise ejection fraction
- left atrial strain
- speckle tracking echocardiography