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Cardiorespiratory responses to incremental exercise in patients with systemic sclerosis
M Schwaiblmair1, J Behr, G Fruhmann
1Abteilung für Pneumologie, Klinikum Grosshadern, University of Munich, Germany.
Chest
|December 1, 1996
Summary
Cardiopulmonary exercise testing reveals early lung involvement in systemic sclerosis patients, even with normal pulmonary function tests. This method detects occult pulmonary impairment missed by standard assessments.
Area of Science:
- Pulmonary Medicine
- Rheumatology
- Cardiopulmonary Physiology
Background:
- Systemic sclerosis (SSc) patients often have subclinical pulmonary abnormalities.
- Conventional pulmonary function tests (PFTs) and chest radiographs may not detect early lung involvement.
Purpose of the Study:
- To investigate the utility of cardiopulmonary exercise testing (CPET) in detecting early pulmonary impairment in SSc patients.
- To identify specific CPET parameters indicative of occult lung disease in SSc.
Main Methods:
- Studied 78 SSc patients (44 limited cutaneous, 34 diffuse cutaneous) using CPET.
- Assessed diffusing capacity, exercise capacity, oxygen uptake, dead space ventilation, and alveolar-arterial oxygen difference during exercise.
- Compared CPET findings with resting pulmonary function.
Main Results:
- Diffuse cutaneous SSc patients showed significantly reduced diffusing capacity.
- Patients with lung involvement exhibited decreased exercise capacity and oxygen uptake.
- CPET identified increased dead space ventilation and widened alveolar-arterial oxygen difference during exercise.
- 15% of patients with normal resting diffusing capacity had abnormal CPET findings.
Conclusions:
- CPET is effective in detecting occult pulmonary impairment in SSc patients with normal resting pulmonary function.
- Resting PFTs have limitations in predicting exercise-induced abnormalities in SSc.
- CPET offers a valuable tool for early diagnosis and management of pulmonary complications in SSc.