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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
801

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Maximal Exercise Testing Using the Incremental Shuttle Walking Test Can Be Used to Risk-Stratify Patients with

Robert A Lewis1,2, Catherine G Billings1,2, Judith A Hurdman1

  • 1Sheffield Pulmonary Vascular Disease Unit, Sheffield Teaching Hospitals National Health Service Foundation Trust, Royal Hallamshire Hospital, Sheffield, United Kingdom.

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Summary

Maximal exercise testing, specifically the incremental shuttle walking test, effectively predicts mortality risk in pulmonary arterial hypertension (PAH). This simple test aids in risk stratification at baseline and follow-up.

Keywords:
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Area of Science:

  • Cardiology
  • Pulmonary Medicine
  • Exercise Physiology

Background:

  • Exercise capacity is a key predictor of mortality in pulmonary arterial hypertension (PAH).
  • Limited data exist on the routine use of maximal exercise testing for PAH risk stratification.
  • The incremental shuttle walking test (ISWT) is a simple, maximal exercise test with potential clinical utility.

Purpose of the Study:

  • To evaluate the ISWT for risk stratification in patients with PAH.
  • To determine if ISWT performance can predict 1-year mortality in PAH.
  • To assess the incorporation of ISWT thresholds into existing risk stratification models.

Main Methods:

  • Analysis of consecutive patients with pulmonary hypertension from the ASPIRE registry (2001-2018).
  • Identification of thresholds for risk levels based on ISWT distance at baseline and follow-up.
  • Assessment of ISWT thresholds' incorporation into REVEAL 2.0 and French low-risk stratification approaches.

Main Results:

  • 1,847 patients with PAH underwent maximal exercise testing.
  • A stepwise reduction in 1-year mortality was observed with increasing ISWT distance.
  • Derived ISWT thresholds (≤180m high risk, 190-330m intermediate, ≥340m low risk) accurately stratified mortality risk at baseline and follow-up.

Conclusions:

  • Maximal exercise testing, via the ISWT, effectively stratifies mortality risk in PAH patients.
  • The ISWT offers a simple, practical alternative to the 6-minute walk test for risk assessment in PAH.
  • ISWT results can be integrated into current risk stratification tools to enhance prognostic accuracy.