Comparison
External counting techniques vs Cardiac catheterization and other definitive…
Design
Review
Authors
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Supports adjunctive screening role for external counting; leaves open prospective validation against catheterization in contemporary cohorts.
External counting techniques are useful as simple, low-risk screening or supplementary tools for studying the circulation, though they cannot replace cardiac catheterization.
Hadley L. Conn (1962) studied this question.
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