Mmtc grading dyspnea
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mMRC modified medical research council dyspnea scale grading criteria
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mMRC (Modified Medical Research Council) Dyspnea Scale
The mMRC is a 5-point self-assessment scale (Grades 0-4) that quantifies breathlessness based on activity level. Higher scores indicate greater impairment.
Grading
| Grade | Description |
|---|---|
| 0 | Not troubled by breathlessness except with strenuous exercise |
| 1 | Short of breath when hurrying on level ground or walking up a slight hill |
| 2 | Walks slower than people of the same age on level ground due to breathlessness, OR has to stop to catch breath when walking at own pace on level ground |
| 3 | Stops for breath after walking ~100 yards (91 m) or after a few minutes on level ground |
| 4 | Too breathless to leave the house, OR breathless when dressing/undressing |
Key Clinical Uses
GOLD ABCD Classification (COPD): An mMRC score ≥ 2 places a patient in the "high symptom" category (Groups B or D).
| GOLD Group | Exacerbations | Symptoms (mMRC) |
|---|---|---|
| A | ≤ 1/year | Grade 0-1 |
| B | ≤ 1/year | ≥ Grade 2 |
| C | ≥ 2/year | Grade 0-1 |
| D | ≥ 2/year | ≥ Grade 2 |
BODE Index (COPD prognosis): mMRC contributes to a 4-variable score predicting mortality:
| mMRC Grade | BODE Points |
|---|---|
| 0-1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
A BODE score > 7 carries ~30% 2-year mortality; score < 5 carries < 10% 2-year mortality.
Notes
- The cutoff mMRC ≥ 2 is the threshold used in GOLD guidelines to define "more symptomatic" patients requiring more aggressive bronchodilator therapy.
- The mMRC focuses purely on activity-related breathlessness and does not capture cough, sputum, or sleep disturbance - for those, the CAT (COPD Assessment Test) score ≥ 10 is the equivalent "high symptom" threshold.
- The scale was originally developed by the British Medical Research Council and later modified (hence "m"). The MRC itself notes it cannot grant permission to use modified versions, though the mMRC is freely used in research and guidelines.
Sources: Harrison's Principles of Internal Medicine 22E, Table 39-1 | Fishman's Pulmonary Diseases and Disorders, Table 40-3 | Symptom to Diagnosis (4th Ed.) | Murray & Nadel's Textbook of Respiratory Medicine
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