Key result
Threatened heart failure is linked to reduced LV work relative to heart size.
Why the study?
Methods requiring active cooperation by subjects to determine cardiac output are unsuitable for clinical study due to errors from patient factors.
Comparison
Ethyl iodide method vs traditional methods requiring active cooperation
Authors
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May inform early detection of impending failure; leaves open prospective validation against modern outcomes.
Cross-Sectional (n=50)
No
The ethyl iodide method offers a potential way to measure cardiac output without requiring active patient cooperation, thereby reducing measurement errors in clinical settings.
Starr et al. (1933) conducted a cross-sectional in Various clinical conditions including normal, hypertension, and cardiac disease (n=50). Threatened congestive heart failure vs. Normal subjects and patients not threatened with failure was evaluated on Relationship between left ventricular work per beat and cardiac size. In patients without congestive failure, basal left ventricular work per beat is linearly proportional to heart size, whereas in patients threatened with failure, the heart performs significantly less work relative to its size.
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