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Medical errors as a result of specialization
Ahmad Hashem1, Michelene T H Chi, Charles P Friedman
1Healthcare Industry Solutions Group, Microsoft Corporation, One Microsoft Way, Redmond, WA 98052, USA. ahmad@hashem.net
Abstract:
Errors in medicine result in over 44,000 preventable deaths annually. Some of these errors are made by specialized physicians at the time of diagnosis. Building on error frameworks proposed in the literature, we tested the experimental hypothesis that physicians within a given specialty have a bias in diagnosing cases outside their own domain as being within that domain. Thirty-two board-certified physicians from four internal medicine subspecialties worked four patient cases each. Verbal protocol analysis and general linear modeling of the numerical data seem to confirm the experimental hypothesis, indicating that specialists try to "pull" cases toward their specialty. Specialists generate more diagnostic hypotheses within their domain than outside, and assign higher probabilities to diagnoses within that domain.
Insights
Physician diagnostic bias can lead to medical errors. Specialists tend to misdiagnose cases outside their expertise as being within their specialty, potentially impacting patient safety.
Area of Science:
- Medical error analysis
- Diagnostic bias in medicine
- Cognitive biases in healthcare professionals
Background:
- Medical errors contribute to significant preventable mortality, with over 44,000 deaths annually.
- Diagnostic errors by specialized physicians represent a critical area of concern within patient safety.
- Existing error frameworks suggest cognitive biases may influence clinical decision-making.
Purpose of the Study:
- To investigate the hypothesis that medical specialists exhibit a domain-specific diagnostic bias.
- To determine if physicians are inclined to diagnose external cases as belonging to their own specialty.
- To quantify the extent of this bias in internal medicine subspecialties.
Main Methods:
- Thirty-two board-certified physicians from four internal medicine subspecialties participated.
- Physicians evaluated four patient cases each, with some cases falling outside their subspecialty.
- Verbal protocol analysis and general linear modeling were employed to analyze diagnostic reasoning and data.
Main Results:
- The experimental hypothesis was supported, indicating a tendency for specialists to 'pull' cases toward their domain.
- Specialists generated a higher number of diagnostic hypotheses within their area of expertise compared to outside.
- Physicians assigned greater diagnostic probabilities to conditions within their specialty, even for external cases.
Conclusions:
- Specialized physicians demonstrate a cognitive bias favoring diagnoses within their own subspecialty.
- This diagnostic bias may contribute to medical errors and impact the accuracy of patient diagnoses.
- Understanding and mitigating this bias is crucial for improving diagnostic accuracy and patient safety.
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