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Changes in pulmonary blood volume during upright exercise. Clinical implications
Chest
|July 1, 1982
Summary
In patients with coronary artery disease, pulmonary blood volume often increases during exercise. This change is linked to the reason patients stop exercising, particularly shortness of breath.
Area of Science:
- Cardiology
- Pulmonary Medicine
- Diagnostic Imaging
Background:
- Coronary artery disease (CAD) affects heart function and can lead to exercise intolerance.
- Pulmonary blood volume changes during exercise are not well understood in CAD patients.
Purpose of the Study:
- To investigate changes in pulmonary blood volume during exercise in patients with coronary artery disease.
- To determine if exercise end-points influence pulmonary blood volume changes in CAD.
Main Methods:
- Symptom-limited upright exercise testing was performed.
- Pulmonary blood volume was measured using first-pass radionuclide angiography.
- Patients with CAD and normal subjects were included.
Main Results:
- Normal subjects showed no significant change in pulmonary blood volume during exercise.
- 68% of CAD patients exhibited an increase in pulmonary blood volume during exercise.
- An increase in pulmonary blood volume was more common in patients who stopped due to shortness of breath (89%) compared to those who stopped due to angina or abnormal ECG (48%).
Conclusions:
- An increased pulmonary blood volume during exercise is a common finding in patients with coronary artery disease.
- The observed changes in pulmonary blood volume are influenced by the specific reasons patients cease exercise.