Bush-Francis Catatonia Rating Scale (BFCRS)
The Bush-Francis Catatonia Rating Scale (BFCRS) is the most widely validated and recommended instrument for diagnosing and quantifying catatonia severity, consisting of a 23-item full scale with scores ranging 0-69, and a 14-item screening version (BFCSI) that requires ≥2 signs present to diagnose catatonia. 1, 2
Scale Structure and Components
The BFCRS has two parts:
- Bush-Francis Catatonia Screening Instrument (BFCSI): 14 items used for initial screening
- Full BFCRS: 23 total items (the 14 screening items plus 9 additional items for severity rating)
Each item is scored on a 0-3 scale:
- 0 = absent
- 1 = mild
- 2 = moderate
- 3 = severe
The full scale yields a total score of 0-69 points. 3, 4
Diagnostic Thresholds
A minimum of 2 signs from the BFCSI is the validated cut-off for diagnosing catatonia, with sensitivity of 100%, specificity of 96.2%, positive predictive value of 79.6%, and negative predictive value of 100%. 5 This threshold aligns with DSM-5 criteria and demonstrates excellent diagnostic accuracy across multiple validation studies. 3, 4
For the complete BFCRS, a total score ≥6 can be used with high accuracy for diagnosing catatonia according to DSM-5 criteria. 3
Administration Method
The scale assesses observable motor and behavioral signs through:
- Direct observation of the patient's spontaneous behavior
- Elicited responses through specific examination maneuvers (e.g., testing for waxy flexibility, posturing, negativism)
- Rating over a 24-hour period for optimal accuracy 6
The examiner observes and tests for signs including: stupor, catalepsy, waxy flexibility, mutism, negativism, posturing, mannerisms, stereotypies, psychomotor agitation, grimacing, echolalia, and echopraxia. 7
Key Clinical Features
The BFCRS demonstrates superior psychometric properties compared to other catatonia rating scales, with inter-rater reliability coefficients of 0.885-0.97, and internal consistency (Cronbach's alpha) of 0.90-0.902. 3, 4, 1 These values indicate excellent reliability across different raters and settings.
Important Distinction: BFCRS vs BFCSI
Use the full 23-item BFCRS rather than just the screening instrument (BFCSI) for comprehensive evaluation, as the BFCSI misses approximately 4% of catatonia cases by excluding signs that require active elicitation rather than passive observation. 5 The full scale captures an "aberrant volitional" dimension comprising signs that need to be actively tested and are not part of the screening instrument.
Three-Dimensional Model
Factor analysis reveals catatonia has three discrete dimensions:
- Retarded dimension: stupor, mutism, staring, withdrawal
- Excited dimension: agitation, combativeness, impulsivity
- Aberrant volitional dimension: signs requiring elicitation (waxy flexibility, posturing, negativism, automatic obedience)
Notably, 55.7% of patients exhibit signs from multiple dimensions concurrently. 5
Clinical Application
The BFCRS is validated across diverse populations including:
- Acute psychiatric inpatients
- Chronic schizophrenia patients 8
- Medical/surgical patients
- Pediatric populations (age ≤18 years) 9
- Patients with neurodevelopmental disorders 9
For chronic schizophrenia patients specifically, a revised binary scoring system (absent vs. present only) may have better psychometric properties than the 0-3 scale, though the standard version remains widely used. 8
Monitoring Treatment Response
The BFCRS effectively tracks treatment response. In pediatric patients treated with lorazepam, mean BFCRS scores decreased from 16.6±6.1 to 9.5±5.3 (mean reduction of 7.1 points), representing a large effect size (Hedges's g = 1.20). 9 This demonstrates the scale's sensitivity to clinical change.
Common Pitfalls
- Do not rely solely on the screening instrument (BFCSI) - it will miss cases where aberrant volitional signs predominate
- Ensure adequate observation time - rating over 24 hours improves accuracy 6
- Actively test for signs - don't just passively observe; many critical signs (waxy flexibility, negativism) require examiner interaction
- Consider negative symptoms as confounders - certain BFCRS items can be influenced by negative symptoms in chronic psychotic patients 8