Left vs right heart failure
Guaranteed exam question, every term, forever.
Memory trick
Left = Lungs (crackles, dyspnea, orthopnea, pink frothy sputum). Right = Rest of the body (JVD, peripheral edema, ascites, weight gain, hepatomegaly).
Left drowns you, right swells you. Two words, ten points.
ABG interpretation in 15 seconds
Respiratory unit lives here and it feels impossible until it clicks.
Memory trick
ROME: Respiratory Opposite (pH โ / COโ โ = resp alkalosis), Metabolic Equal (pH โ / HCOโ โ = metabolic acidosis). Look at pH first, then match it to COโ or HCOโ.
pH tells you who's guilty. COโ and bicarb tell you which one did it.
Potassium: the killer on both ends
Hyper- and hypokalemia both cause lethal dysrhythmias with opposite EKG changes.
Memory trick
High Kโบ = tall peaked T waves, muscle weakness, bradycardia โ calcium gluconate to protect the heart, insulin + D50 to shift, kayexalate/dialysis to remove. Low Kโบ = flat T waves + U waves, cramps โ replace slowly, NEVER IV push.
IV push potassium is a felony against your patient. Diluted and pumped only.
Chest pain workup order
Priority questions want the sequence, not the treatment list.
Memory trick
Assess โ 12-lead EKG within 10 minutes โ aspirin (chewed) โ nitro (check SBP >90, no PDE5 inhibitors in 24โ48h) โ morphine โ troponin. Oxygen only if SpOโ <90%.
Nitro + Viagra = a blood pressure that leaves the building. Always ask.
DKA vs HHS
Endocrine's favorite compare-and-contrast.
Memory trick
DKA = type 1, glucose 300โ600, ketones + acidosis, Kussmaul breathing, fruity breath, sicker faster. HHS = type 2, glucose >600, no ketones, profound dehydration, altered LOC, sneaks up over days. Both: fluids first, then insulin drip, then watch potassium crash.
Insulin drives Kโบ into the cell. Your patient's Kโบ will tank. Watch it like a hawk.
COPD vs asthma management
The oxygen question ('how much do I give a COPD patient') is a trap when you overthink it.
Memory trick
Target SpOโ 88โ92% in COPD. Pursed-lip breathing on exhalation. Asthma: rescue (albuterol) before controller (steroid inhaler), rinse the mouth after steroids. A silent chest in asthma is an emergency, not improvement.
Quiet asthma isn't calm. It's a patient who can't move air.
Post-op complication timeline
Med-Surg loves 'day 3 post-op, patient has ___' stems.
Memory trick
First 24h: bleeding, atelectasis, urinary retention. Day 2โ3: fever from atelectasis/pneumonia. Day 3โ5: DVT/PE, wound infection. Day 5โ7: dehiscence/evisceration (cover with sterile saline gauze, low Fowler's, knees bent, call surgery).
Thyroid storm vs myxedema coma
Endocrine emergencies with opposite everything.
Memory trick
Storm = hyper gone wild: fever, tachycardia, agitation โ cool them, beta blocker, antithyroid meds. Myxedema = hypo gone flat: hypothermia, bradycardia, hypoventilation โ warm slowly, IV levothyroxine, airway support.