Prediction of Alcohol Withdrawal Severity Scale
Screens hospitalized patients for complicated alcohol withdrawal (seizures, delirium tremens).
- Patients ≥18 years old admitted to general floor, with or without history of alcohol abuse.
- Do not use in patients with active or uncontrolled seizure disorder.
- Complicated alcohol withdrawal syndrome (AWS) is defined as withdrawal hallucinosis, withdrawal-related seizures, or delirium tremens.
- Not yet validated in non-English speaking patients.
- Patients with active or uncontrolled seizure disorder, obtunded, or unable to understand the questionnaire were excluded from the study.
- The majority of patients included in the studies were on general medical floors. A limited number of patients from the emergency department, surgical floors, and critical care units were included.
- Other alcohol withdrawal tools like CIWA-Ar stratify severity of AWS and can be used sequentially with the PAWSS (i.e., use PAWSS to screen for those at high risk for AWS, then use CIWA-Ar to determine if treatment is needed) (Eloma 2018).
- 10% of symptomatic individuals experience withdrawal-related generalized tonic-clonic seizures. If left untreated, about one-third of patients with withdrawal seizures will progress to delirium tremens.
- Prevalence of at-risk or heavy alcohol use tends to be higher among adults actively seeking healthcare in the general population.
- Most patients undergoing alcohol withdrawal experience uncomplicated AWS and only need supportive care, but up to 20% have complicated AWS (i.e., withdrawal hallucinosis, seizures, delirium tremens), which can result in substantial morbidity and up to 15% mortality if unrecognized. With aggressive prevention and recognition, mortality rates decrease to 1-4% (Schuckit 2014).
- PAWSS Scores ≥4 were 93.1% sensitive and 99.5% specific for development of complicated AWS in prospective validation (Maldonado 2015).
Management
- Subjects at risk for alcohol withdrawal should be placed on symptom-triggered therapy.
- May be used to inform which patients may be appropriate candidates for the CIWA-Ar protocol.
Evidence
PAWSS Scores ≥4 suggest high risk for complicated AWS. Prophylaxis and/or treatment may be indicated.
FACTS & FIGURES
PAWSS Score | Risk of complicated AWS* | Likelihood ratio** |
---|---|---|
<4 | Average | 0.07 |
≥4 | High | 174 |
EVIDENCE APPRAISAL
Derivation study, Maldonado 2014
- Design
- Systematic review and pilot prospective cohort.
- n = 17.
- Aim
- Identify clinical factors associated with the development of alcohol withdrawal syndromes.
- Develop a tool for the prediction of alcohol withdrawal among patients at risk.
- Conduct a pilot study to assess the validity of the tool.
- Inclusion criteria
- Age ≥18 years.
- Exclusion criteria
- Non-English speaking patients.
- Outcomes
- Negative PAWSS (score <4): n = 13, 0% of patients developed moderate or severe AWS.
- Positive PAWSS (score ≥4), n = 4, 100% of patients developed moderate or severe AWS.
Validation study, Maldonado 2015
- Design
- Prospective cohort study in two teaching hospitals.
- n = 403.
- Aim
- Prospectively validate PAWSS.
- Inclusion criteria
- Age ≥18 years regardless of probable or confirmed alcohol use.
- Patients directly admitted from the emergency department or community settings to general medicine or surgery units.
- Able to communicate in English.
- Exclusion criteria
- Non-English speaking patients.
- Patients unable to understand the questionnaire or participate in the study.
- Patient transferred from outside hospitals.
- Active or uncontrolled seizures.
- Patient in active alcohol withdrawal upon presentation.
- Too sick to participate as per primary team.
- Outcomes
- Negative PAWSS (score <4), n = 374, 0.5% of patients developed moderate or severe AWS.
- Positive PAWSS (score ≥4), n = 29, 93.1% of patients developed moderate or severe AWS.
- Sensitivity 93.1%, specificity 99.5%, PPV 93.1%, NPV 99.5%.
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