The role of strategy and redundancy in diagnostic reasoning

BMC Medical Education

Maria Hodel¹  Sabine Feller¹  Daniel Hofer¹  Ralph F Bloch¹ 

[1] Institute for Medical Education (IAWF), Faculty of Medicine, University of Bern, Inselspital 37a, 3010 Bern, Switzerland

关键词: experimental studies;    entropy;    cognitive psychology;    medical education;    clinical decision making;    diagnostic reasoning;   

Others  :  1164899
DOI  :  10.1186/1472-6920-3-1

 received in 2002-07-23, accepted in 2003-01-24,  发布年份 2003

【 摘 要 】

Background

Diagnostic reasoning is a key competence of physicians. We explored the effects of knowledge, practice and additional clinical information on strategy, redundancy and accuracy of diagnosing a peripheral neurological defect in the hand based on sensory examination.

Method

Using an interactive computer simulation that includes 21 unique cases with seven sensory loss patterns and either concordant, neutral or discordant textual information, 21 3rd year medical students, 21 6th year and 21 senior neurology residents each examined 15 cases over the course of one session. An additional 23 psychology students examined 24 cases over two sessions, 12 cases per session. Subjects also took a seven-item MCQ exam of seven classical patterns presented visually.

Results

Knowledge of sensory patterns and diagnostic accuracy are highly correlated within groups (R² = 0.64). The total amount of information gathered for incorrect diagnoses is no lower than that for correct diagnoses. Residents require significantly fewer tests than either psychology or 6th year students, who in turn require fewer than the 3rd year students (p < 0.001). The diagnostic accuracy of subjects is affected both by level of training (p < 0.001) and concordance of clinical information (p < 0.001). For discordant cases, refutation testing occurs significantly in 6th year students (p < 0.001) and residents (p < 0.01), but not in psychology or 3rd year students. Conversely, there is a stable 55% excess of confirmatory testing, independent of training or concordance.

Conclusions

Knowledge and practice are both important for diagnostic success. For complex diagnostic situations reasoning components employing redundancy seem more essential than those using strategy.

【 授权许可】

   
2003 Bloch et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.

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