What question did this study set out to answer?

To investigate the factors driving wide variations in reported sensitivity and specificity benchmarks for graded exercise tests in diagnosing coronary disease.

November 19, 1982JAMA

The limited spectrum of patients studied in exercise test research. Analyzing the tip of the iceberg

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Why the study?

Are patients included in formal studies of exercise test diagnostic efficacy representative of the general population undergoing the test?

Key Points

To investigate the factors driving wide variations in reported sensitivity and specificity benchmarks for graded exercise tests in diagnosing coronary disease.
Analyzed data from 205 consecutive graded exercise tests conducted across two hospital-based exercise laboratories.
Evaluated patient eligibility against standard diagnostic trial criteria, including verification by coronary angiography and exclusion of equivocal results.
Only 3% of consecutive clinical patients receiving exercise tests met the conventional inclusion criteria required for formal diagnostic efficacy studies.
Standard research evaluations systematically exclude the vast majority of real-world patients, analyzing only an unrepresentative fraction analogous to the tip of an iceberg.

Structured PICO

Are patients included in formal studies of exercise test diagnostic efficacy representative of the general population undergoing the test?

Population

205 consecutive exercise tests at two hospital-based exercise laboratories

Intervention

Graded exercise test

Outcome

Proportion of patients eligible for inclusion in a typical formal study of diagnostic efficacy

Demonstrates significant spectrum bias in diagnostic studies of exercise testing, as only 3% of real-world patients would qualify for formal diagnostic efficacy trials.

Discussion

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Implication

Real-world exercise test patients rarely meet trial criteria; leaves open whether diagnostic accuracy estimates generalize beyond highly selected cohorts.

Cite This Study

John T. Philbrick (1982) studied this question.

synapsesocial.com/papers/6a7e7b0c7cc91b73254d93b9 https://doi.org/10.1001/jama.248.19.2467

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Implication

Real-world exercise test patients rarely meet trial criteria; leaves open whether diagnostic accuracy estimates generalize beyond highly selected cohorts.

The limited spectrum of patients studied in exercise test research. Analyzing the tip of the iceberg

Key Points

Structured PICO

Discussion

Implication

Cite This Study

The limited spectrum of patients studied in exercise test research. Analyzing the tip of the iceberg

Key Points

Structured PICO

Discussion

Implication

Cite This Study

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