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Variability in the American Society of Anesthesiologists Physical Status Classification Scale
Wendy L Aronson1, Maura S McAuliffe, Ken Miller
1Uniformed Services University of the Health Sciences, Graduate School of Nursing, Nurse Anesthesia Program, Silver Spring, Md., USA.
AANA Journal
|September 19, 2003
Summary
Anesthesia providers show poor agreement when assigning the American Society of Anesthesiologists (ASA) Physical Status (PS) scores, impacting patient care. Key factors like smoking and surgery type influence these inconsistent scores.
Area of Science:
- Anesthesiology
- Healthcare Quality
- Medical Informatics
Background:
- The American Society of Anesthesiologists (ASA) Physical Status (PS) Classification is a globally recognized tool for assessing patient preoperative health.
- This classification system influences critical areas such as policy-making, performance evaluation, resource allocation, and reimbursement for anesthesia services.
- The ASA PS score is frequently referenced in clinical research, highlighting its importance in the medical community.
Purpose of the Study:
- To evaluate the interrater reliability of the ASA Physical Status (PS) Classification among anesthesia providers.
- To identify and describe the specific sources of variability that contribute to inconsistencies in assigning ASA PS scores.
Main Methods:
- A questionnaire comprising 10 hypothetical patient scenarios was administered to 70 anesthesia providers.
- Participants were tasked with assigning an ASA PS score to each scenario and providing their rationale.
- Data were analyzed and stratified based on provider type (nurse anesthetist vs. anesthesiologist) and practice setting (military vs. nonmilitary).
Main Results:
- A significant lack of interrater reliability was observed in the assignment of ASA PS scores.
- No statistically significant differences were found between the various anesthesia provider groups (nurse anesthetists, anesthesiologists, military, nonmilitary).
- No correlation was identified between ASA PS scoring and years of practice or other demographic variables.
Conclusions:
- The study demonstrates considerable variability and a lack of interrater reliability in the application of the ASA PS Classification system.
- Factors such as smoking, pregnancy, surgical complexity, airway management concerns, and acute injury were identified as significant sources of score variability.
- Despite its widespread use, the subjectivity in applying the ASA PS score necessitates further investigation and potential standardization efforts to improve consistency in patient assessment.