Exercise responses in pulmonary stenosis

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6 Scopus citations

Abstract

Many children with pulmonary stenosis have a limited response to exercise. The limitation is related to the severity of the stenosis and it improves after relief of the obstruction. The exercise limitation appears to be more marked in adult patients than in children. Work performance is limited by an inability to increase stroke index during exercise. Even though exercise heart rates are normal in these patients, the resulting cardiac index during exercise is often less than expected, and total work, maximal work, or endurance times are reduced. Studies of exercise during cardiac catheterization have shown a similar limitation in the capacity to increase stroke index and an abnormal increase in right ventricular end-diastolic pressure. This combination of exercise abnormalities might be the result of reduced right ventricular contractility, but it may reflect, as well, a reduced ventricular compliance from right ventricular hypertrophy because the changes revert toward normal after relief of the stenosis. Among children with pulmonary stenosis, exercise testing has provided insight about the altered hemodynamics of this cardiac defect. Testing has also been useful to clinicians for quantifying the magnitude of functional limits and the changes with treatment of their patients.

Original languageEnglish (US)
Pages (from-to)8-13
Number of pages6
JournalProgress in Pediatric cardiology
Volume2
Issue number3
DOIs
StatePublished - Jan 1 1993

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