Virchow's triad demonstrates the underlying cause for the formation of venous thrombus: - Hypercoagulability - Hemodynamic changes (stasis or turbulence) - Endothelial injury/dysfunction

Charcot's cholangitis triad is used for the diagnosis of acute cholangitis (note that not all patients meet the criteria): - Fever - Jaundice - Right upper quadrant abdominal pain

Hamburger sign for ruling out the diagnosis of appendicitis: - if a patient wants to eat, consider a diagnosis other than appendicitis

Beck’s triad is used for the diagnosis of cardiac tamponade: - Hypotension - Jugular venous distension - Muffled heart sounds Don't mix up with the diagnosis of tension pneumothorax: - Hypotension - Jugular venous distension - Absent breath sounds

Horner's syndrome triad: - miosis (constricted pupil) - partial ptosis - loss of hemifacial sweating (anhidrosis)

Triad of Opioid Overdose: - Pinpoint pupils - Respiratory Depression - CNS Depression

Triad of Ruptured Abdominal Aortic Aneurysm: - Severe Abdominal/Back Pain - Hypotension - Pulsatile Abdominal mass

Cushing’s Triad (Raised Intracranial Pressure): - Bradycardia - Irregular respiration - Hypertension

Pheochromocytoma Tried: - Palpitations - Headache - Perspiration (Diaphoresis)

Meningitis Triad: - Fever - Headache - Neck Stiffness

Neurogenic Shock Tried: - Bradycardia - Hypotension - Hypothermia

Diabetes mellitus triad: - Polyuria - Polyphagia - Polydipsia

Murphy's triad is used for acute appendicitis: - Pain in the right iliac fossa - Vomiting - Temperature (Fever)

Reiter's syndrome (or reactive arthritis) triad. The clinical features that occur after an infection: - conjunctivitis - urethritis - arthritis

Some patients (not all) with myasthenia gravis may demonstrate a peek sign which is fatigue of the orbicularis oculi muscle after sustained tight closure of the eyelid, as shown in the picture below

Cauda equina syndrome (CES) classic triad: - Saddle anesthesia - Bowel and/ or bladder dysfunction - Lower extremity weakness