5-Minute Emergency Consult
- MAOI hypertensive crisis syndrome
- Masked mastoiditis
- Masticatory muscle disorders
- Maxillary sinusitis
- Measles encephalitis
- Mechanical ventilation
- Meckler triad
- Medial collateral ligament (MCL)
- Medial meniscus injury
- Medical Research Council (mMRC) dyspnea scale
- Medium vessel vasculitides
- Meigs syndrome
- Melanoma
- Meniscal tears
- Meniscus injury
- Mesenteric artery thrombus
- Mesenteric venous thrombosis
- Metabolic acidosis
- Metabolic alkalosis
- Metabolism, inborn errors of
- Metaphysis
- Metatarsal fractures, foot
- Microperforation
- Midgut volvulus
- Migratory polyarthritis
- Minute ventilation (MV)
- Miosis
- Mitral regurgitation
- Mitral stenosis
- Monocular diplopia
- Monteggia fracture
- Multiple-dose activated charcoal
- Multiple organ dysfunction syndrome (MODS)
- Multiple rib fractures
- Murphy sign
- Muscle hemorrhage
- Myasthenic crisis
- Mycobacterium marinum, lymphangitis from
- Mycotoxins
- Mydriasis
- Myelin dysfunction
- Myxedema coma