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April 1, 1992Catheterization and Cardiovascular Diagnosis

Effect of exercise on indices of valvular aortic stenosis

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Why the study?

Does supine exercise affect indices of valvular aortic stenosis in patients with aortic stenosis?

Population

80 patients with aortic stenosis

Comparison

Supine exercise vs Rest (baseline measurements)

Design

Cohort

Authors

TMTimothy W. MartinJMJoe M. MoodyJBJulio J. Bird

Discussion

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Overview

Work loss index changed least with supine exercise in aortic stenosis; leaves open its role as a stable severity metric pending prospective validation.

Key Points

  • To determine how supine exercise influences different hemodynamic indices used to assess the severity of valvular aortic stenosis.
  • Assessed 80 patients with aortic stenosis at rest and during supine exercise.
  • Calculated and compared Gorlin valve area, Cannon valve area, aortic valve resistance, and modified stroke work loss index across both hemodynamic states.
  • Exercise significantly increased Gorlin (18.6% change) and Cannon areas (19.3% change) and decreased valve resistance (15.3% change) and work loss (12.2% change; P < 0.02 vs other indices).
  • Rest-to-exercise correlation was highest for the stroke work loss index (r = 0.94) compared with valve resistance (r = 0.93), Cannon area (r = 0.89), and Gorlin area (r = 0.88).
  • In patients with severe stenosis (Gorlin area < 1 cm²), work loss maintained a significantly lower percent change and stronger correlation between rest and exercise compared to other metrics.

Structured PICO

Does supine exercise affect indices of valvular aortic stenosis in patients with aortic stenosis?

P
Population
80 patients with aortic stenosis
I
Intervention
Supine exercise
C
Comparator
Rest (baseline measurements)
O
Outcome
Changes in Gorlin valve area, Cannon valve area, aortic valve resistance, and a modified stroke work loss indexsurrogate

The modified stroke work loss index is less affected by changes in physiologic state (supine exercise) than other traditional indices of aortic stenosis severity.

Cite This Study

Martin et al. (1992) studied this question.

synapsesocial.com/papers/6a0ff7f6d8c5cf602efd7053https://doi.org/10.1002/ccd.1810250402
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