How to use this: Start with Age Bucket, ENT Exceptions, Pain Language, and Syndrome Showdown. Those are the “compare/contrast” zones most likely to turn into Select-2, matching, order, and all/none-of-the-above style questions.
Click cards to flip. Mini-quiz answers appear after selection.
Click cards to flip. Mini-quiz answers appear after selection.
🧠 Master Brain Map
Highest-yield buckets
Age effectsExceptionsAirway emergenciesPain termsSerotonin vs MH/NMSAcute vs chronic
Ranalli-style thought pattern
Do not memorize as isolated facts. Ask: What is the exception? What happens first? Which TWO are paired? Which sign distinguishes this from the look-alike?
Built-in traps to watch
“Routine” deep extubation, normal creatinine in elderly, allodynia vs hyperalgesia, CRPS I vs II, clonus vs rigidity, SLN vs RLN, local anesthetic vs alcohol/phenol/RFA.
Weekend review order
| Pass | Do this | Why |
|---|---|---|
| 1 | Read all comparison tables | Builds mental scaffolding fast. |
| 2 | Flip flashcards | Finds weak memory hooks. |
| 3 | Do mini-quizzes | Tests Ranalli-style traps. |
| 4 | Review “exceptions” and “first findings” | These are exam candy. |
👵 Age Bucket — Everything Aging in One Place
Core concept
Physiologic age beats chronologic age. Aging decreases reserve. Frailty = decreased reserve + poor resistance to stressors. The test move is usually: “elderly patient looks stable until anesthesia/surgery removes their reserve.”
| System | Age-related change | Anesthesia implication | Ranalli trap |
|---|---|---|---|
| CNS | ↓ brain mass, ↓ neurotransmitters, ↑ sensitivity to sedatives | Lower anesthetic requirements, delirium risk, avoid excessive benzos/anticholinergics | Delirium is acute/fluctuating; POCD is cognitive decline after surgery |
| Cardiac | Stiff vessels, ↑ afterload, LVH, impaired relaxation | Preload dependent, hypotension after induction, slower compensation | “Normal BP” may hide poor reserve |
| Pulmonary | ↓ elastic recoil, ↑ closing capacity, V/Q mismatch | Hypoxemia/atelectasis risk, preoxygenate, lung-protective ventilation | FRC/closing capacity language gets tested |
| Renal | ↓ renal blood flow/GFR | Dose-adjust renally cleared meds; avoid nephrotoxins | Creatinine may look normal because muscle mass is low |
| Hepatic | ↓ hepatic blood flow and mass | Slower metabolism of flow-limited drugs | Drug duration can be prolonged even without “liver disease” |
| Body composition | ↓ total body water, ↓ lean mass, ↑ fat | Hydrophilic drugs have higher concentration; lipophilic drugs have larger Vd/prolonged duration | More fat ≠ larger dose for everything |
| Temperature | Impaired thermoregulation | Aggressive warming; hypothermia increases complications | Elderly get cold fast and recover slowly |
Memory hook: OLD PEOPLE
Oxygen reserve ↓, Liver flow ↓, Drug sensitivity ↑, Preload dependence ↑, Emergence prolonged, Opioid/benzo sensitivity ↑, Polypharmacy, Low temp, Executive/cognitive reserve ↓.
Age vs Frailty vs Function
Chronologic age = number. Physiologic age = reserve/function. Frailty phenotype = weight loss, exhaustion, weakness, slow walking, low activity. ≥3 = frail. Frailty index = accumulated deficits.
Older adult has “normal creatinine.” Safe to ignore renal dosing?
No. Low muscle mass can mask ↓ GFR.
Most important elderly anesthesia theme?
Decreased functional reserve.
Frailty phenotype criteria?
Weight loss, exhaustion, weakness, slow walking speed, low physical activity.
Mini-quiz: Which finding best supports frailty rather than simply chronologic aging?
Correct: B. Frailty is decreased reserve/deficit accumulation, not just age.
🧓 Geri Cognition + Medication Bucket
| Concept | Onset/course | Key findings | Test trap |
|---|---|---|---|
| Postoperative delirium | Acute, fluctuating | Inattention, altered awareness, disorganized thinking | Often reversible; look for causes: meds, infection, hypoxia, pain, urinary retention |
| POCD / delayed neurocognitive recovery | Days-weeks after surgery | Memory, executive dysfunction, concentration issues | Not the same as delirium |
| Dementia | Chronic progressive | Baseline cognitive decline | Not acute/fluctuating unless delirium superimposed |
| Depression | Variable | Low mood, sleep/appetite changes, poor concentration | Pseudodementia can mimic cognitive decline |
Beers/polypharmacy quick bucket
In older adults, be suspicious of benzodiazepines, anticholinergics, sedative-hypnotics, muscle relaxants, meperidine, and unnecessary duplicate CNS depressants. High-yield anesthesia move: reduce dose, avoid deliriogenic meds, review OTC/herbals, and reconcile everything.
| Medication/class | Why it matters | Anesthesia implication |
|---|---|---|
| Benzodiazepines | Delirium, falls, respiratory depression | Avoid routine premed or use tiny dose only when clearly needed |
| Anticholinergics | Confusion, urinary retention, tachycardia, dry mouth | Can worsen delirium; avoid “because we always do” |
| Opioids | Respiratory depression, ileus, delirium | Multimodal analgesia; titrate slowly |
| NSAIDs | Renal/GI/bleeding risk | Assess renal function, anticoagulants, surgical bleeding |
| Gabapentinoids | Sedation, dizziness, respiratory depression with opioids | Careful with elderly + opioids |
🔥 Pain Language Bucket
| Term | Meaning | Example | Trap |
|---|---|---|---|
| Algesia | Increased sensitivity to pain | Sunburn hurts more than normal | Not same as algogenic |
| Algogenic | Pain producing | Bradykinin at injury site | Substance/stimulus causes pain |
| Allodynia | Nonharmful stimulus perceived as painful | Light touch hurts | Common in neuropathic/chronic pain |
| Hyperalgesia | Increased response to painful stimulus | Pinprick hurts excessively | Stimulus is painful already |
| Dysesthesia | Unpleasant abnormal sensation | Ants crawling/burning | Can be spontaneous or evoked |
| Paresthesia | Abnormal sensation | Tingling/pins and needles | Not necessarily painful |
| Neuralgia | Pain in nerve distribution | Trigeminal neuralgia | Distribution clue |
| Neuropathy | Abnormal nerve function | Diabetic neuropathy | Broader dysfunction, not just pain |
Quick distinction
Allodynia = “that should NOT hurt.” Hyperalgesia = “that should hurt, but not THAT much.”
Light touch causes severe pain.
Allodynia.
Pain along CN V distribution.
Neuralgia.
Bradykinin is pain-producing.
Algogenic.
⚡ Pain Pathway + Fibers + Neurotransmitters
| Step | Definition | Where | Drug/thought hook |
|---|---|---|---|
| Transduction | Noxious stimulus → electrical signal | Peripheral nociceptor | NSAIDs reduce prostaglandin sensitization |
| Transmission | Signal travels peripheral nerve → dorsal horn → brain | Aδ/C fibers, dorsal horn, spinothalamic tract | Local anesthetics, regional anesthesia |
| Perception | Conscious awareness/interpretation of pain | Thalamus/cortex | General anesthetics, opioids |
| Modulation | Descending inhibition or amplification | Brainstem/dorsal horn | α2 agonists, antidepressants, NMDA modulation |
| Fiber | Myelin | Speed | Pain type | Neurotransmitter clue |
|---|---|---|---|---|
| A-delta | Myelinated | Fast | Sharp, localized, first pain | Glutamate/fast signaling |
| C fiber | Unmyelinated | Slow | Dull, burning, aching, chronic/second pain | Substance P → NK-1 |
| Mediator | Receptor/action | High-yield association |
|---|---|---|
| Substance P | NK-1; vasodilation, extravasation, mast cell degranulation | C fibers; slow/chronic pain |
| Glutamate | AMPA/NMDA | Fast pain + wind-up/NMDA sensitization |
| Bradykinin | B1/B2 | Strongly algogenic |
| Histamine | H receptors | Edema, vasodilation, inflammation |
| Prostaglandins | COX pathway | Sensitization; NSAID target |
Select 2: Which statements describe A-delta fibers?
Correct: C and D. A-delta = myelinated, fast, sharp/localized. C = unmyelinated, slow/dull/burning.
🔁 Acute vs Chronic Pain Bucket
| Feature | Acute pain | Chronic pain |
|---|---|---|
| Duration | Expected after injury/surgery; resolves with healing | Uninterrupted pain >3 months |
| Purpose | Protective warning signal | Pathologic maladaptive signaling |
| Dominant physiology | Nociception + stress response | Central sensitization, wind-up, neuropathic/inflammatory/psychologic components |
| Consequences | ↑ HR/BP, ↑ myocardial demand, splinting, atelectasis | Functional decline, psychosocial burden, opioid tolerance/hyperalgesia risk |
| Anesthesia plan | Treat aggressively, multimodal, regional when appropriate | Continue baseline meds when appropriate, prevent withdrawal, multimodal + ketamine/dex/lidocaine/regional considerations |
Chronic pain patient with acute surgical pain
Expect higher analgesic needs, possible opioid tolerance, anxiety/catastrophizing, polypharmacy, and withdrawal risk. Plan: verify home regimen, continue baseline opioid/meds when appropriate, multimodal analgesia, regional, NMDA antagonist consideration, realistic pain goals.
Wind-up sequence — put in order
- Chronic/repetitive nociceptive stimulation
- NMDA activation → ↑ intracellular calcium
- Release of excitatory neurotransmitters/inflammatory mediators
- COX activation → prostaglandin synthesis
- ↓ inhibitory pathway function + ↑ pathway excitability
- Hyperalgesia/allodynia → positive feedback loop
🧩 Chronic Pain Interventions Bucket
| Intervention | Use | Meds/tech | Trap |
|---|---|---|---|
| Lumbar epidural steroid injection | Low back/radicular pain | Local anesthetic + corticosteroid | Transforaminal = more targeted but higher vascular/nerve risk |
| Facet/joint/peripheral injections | Localized pain generators | LA ± steroid | LA gives fast relief; steroid delayed/longer |
| Sympathetic ganglion block | Diagnostic/therapeutic sympathetically mediated pain | Short-term = local anesthetic; long-term = alcohol/phenol/RFA | Do not pick alcohol/phenol for diagnostic short-term |
| RFA | Longer-term sensory interruption | Heat disrupts pain signaling | Goal often myelin disruption with axon preservation |
| Cryoablation | Longer-term sensory interruption | Cold | Contrast with RFA = cold vs heat |
| Spinal cord stimulator | Failed back surgery syndrome, CRPS, refractory pain | Dorsal column stimulation/gate theory | Risks: lead migration, infection, hematoma, CSF leak |
| Intrathecal pump | Refractory severe pain/spasticity | Implantable drug delivery | Device infection/malfunction/withdrawal risk |
| Ganglion block | Region/condition clue |
|---|---|
| Sphenopalatine | Facial pain, cluster headache, trigeminal neuralgia |
| Stellate | Upper extremity/thoracic pain, hyperhidrosis, postherpetic neuralgia |
| Celiac | Abdominal cancer/pancreatic pain |
| Hypogastric | Chronic pelvic pain, malignancy/endometriosis |
Which is used for short-term diagnostic sympathetic ganglion blockade?
Correct: A. Alcohol/phenol/RFA are longer-term therapeutic options after diagnostic success.
🌡️ Syndrome Showdown — Serotonin vs MH vs NMS vs Thyroid Storm
| Feature | Serotonin syndrome | Malignant hyperthermia | NMS | Thyroid storm |
|---|---|---|---|---|
| Trigger | Serotonergic meds/interactions | Volatile anesthetics, succinylcholine | Dopamine antagonists/withdrawal dopamine meds | Untreated hyperthyroidism, surgery/stress |
| Signature sign | Clonus, hyperreflexia | ↑ ETCO₂, rigidity, hypermetabolism | Lead-pipe rigidity, bradyreflexia | Fever, tachycardia, HTN, GI/CNS symptoms |
| Temperature | Hyperthermia can be major | Hyperthermia often late | Hyperthermia | Hyperthermia |
| Potassium | Hyperkalemia can occur with severe toxicity/rhabdo | Hyperkalemia is classic concern | Usually less central than MH | Not defining |
| Treatment | STOP: stop agents, supportive care, benzos, oxygen/intubation/paralysis/sedation, cyproheptadine | Stop trigger, dantrolene, cool, treat hyperK/acidosis | Stop agent, supportive, dantrolene/bromocriptine sometimes | Beta blocker, PTU/methimazole, iodine after thionamide, steroids, support |
| Do NOT | Antipyretics ineffective; avoid beta blockers, Haldol, succinylcholine | Avoid triggers | Avoid dopamine blockers | Do not give iodine before thionamide |
Ranalli trap
If the stem gives clonus, think serotonin syndrome first. If it gives rising ETCO₂ after volatile/succ, think MH. If it gives lead-pipe rigidity after antipsychotic, think NMS.
Most important clinical sign in Hunter Serotonin Toxicity Criteria?
Correct: C. Clonus is the big differentiator. Hyperthermia and hyperkalemia can matter, but clonus is the Hunter Criteria star.
👂 ENT Anatomy Bucket
| Paired cartilages | Unpaired cartilages |
|---|---|
| Arytenoid, Corniculate, Cuneiform | Thyroid, Cricoid, Epiglottis |
Memory hook
Paired = ACC: Arytenoid, Corniculate, Cuneiform. Unpaired = TCE: Thyroid, Cricoid, Epiglottis.
| Nerve | Sensory/motor | Innervation | Trap |
|---|---|---|---|
| Internal branch SLN | Sensory | Laryngeal mucosa above vocal cords | Internal = sensory above cords |
| Recurrent laryngeal nerve | Sensory + motor | Sensory below cords; motor to all intrinsic muscles except cricothyroid | Big exception = cricothyroid |
| Glossopharyngeal | Sensory | Superior epiglottis + base of tongue | Gag reflex zone |
| External branch SLN | Motor | Cricothyroid | Only intrinsic laryngeal muscle innervated by SLN |
| Intrinsic muscle | Innervation | Function | Memory |
|---|---|---|---|
| Cricothyroid | External SLN | Tenses/elongates vocal cords | Exception muscle |
| Posterior cricoarytenoid | RLN | Abducts vocal cords | PB = Posterior Breathes / opens |
| Lateral cricoarytenoid | RLN | Adducts vocal cords | LAD = Lateral ADducts |
| Transverse/oblique arytenoid | RLN | Adduct vocal cords | Close posterior glottis |
| Thyroarytenoid/vocalis | RLN | Relax vocal cords | Fine-tune voice |
Select 2: Cricothyroid muscle facts?
Correct: C and D. Cricothyroid is the SLN exception and tenses/elongates cords.
🫁 ENT Surgery + Airway Bucket
| Procedure/issue | Anesthesia concern | High-yield plan | Trap |
|---|---|---|---|
| Thyroidectomy | RLN injury, hematoma, hypocalcemia, thyroid storm risk | Awake extubation generally; assess voice/airway; consider NIM tube; continue antithyroid meds | Do not routinely plan deep extubation |
| Parathyroidectomy | Calcium shift/hypocalcemia | Monitor Ca/PTH; watch for tingling, tetany, laryngospasm later | Symptoms usually hours later, not always immediate PACU |
| Tonsil/adenoid | Shared airway, bleeding, laryngospasm, aspiration | Protect airway; extubate awake vs deep based on risk/institution/provider | Post-tonsil bleed = full stomach mindset |
| Ear surgery/tympanoplasty | Closed air space | Avoid/limit N₂O | N₂O expands middle-ear space and can affect graft |
| Sinus/nasal surgery | Bleeding obscures field | Deliberate hypotension if appropriate; vasoconstrictors; throat pack awareness | Cocaine is ester LA and vasoconstrictor |
| Laryngoscopy/airway laser | Shared airway + fire risk | Laser-safe tube, lowest FiO₂ feasible, avoid N₂O, saline in cuff, eye protection | Airway fire = remove tube FIRST |
| Nerve monitoring | Need EMG signal | Avoid sustained NMB after intubation when nerve monitoring needed | Paralysis can ruin monitoring |
Airway fire order — memorize
- Stop ventilation and disconnect circuit.
- Remove ETT immediately.
- Flood airway with saline/water.
- Re-establish ventilation with mask, then reintubate when safe.
- Bronchoscopy to assess injury; treat complications.
Thyroidectomy airway timeline
Immediate: hematoma, airway edema, bilateral RLN issue. Early hours: calcium/PTH trends. Later/severe hypocalcemia: paresthesias, tetany, QT prolongation, laryngospasm. PACU assessment is airway/voice/neck first; calcium monitoring is important but symptoms may lag.
🚩 Exceptions + “Only” Facts Bucket
| Prompt | Answer | Memory hook |
|---|---|---|
| Only intrinsic laryngeal muscle not innervated by RLN | Cricothyroid | CT = SLN exception |
| Only intrinsic muscle that abducts cords | Posterior cricoarytenoid | PB = Posterior Breathes |
| Muscle that adducts vocal cords | Lateral cricoarytenoid + arytenoids | LAD = Lateral ADducts |
| Paired laryngeal cartilages | Arytenoid, corniculate, cuneiform | ACC |
| Unpaired laryngeal cartilages | Thyroid, cricoid, epiglottis | TCE |
| Only local anesthetic with vasoconstrictive property | Cocaine | Cocaine constricts |
| Serotonin syndrome signature sign | Clonus | Clonus = serotonin until proven otherwise |
| Short-term sympathetic block medication | Local anesthetic | Diagnostic = temporary |
| Long-term sympathetic block options | Alcohol, phenol, RFA | Therapeutic = longer-term |
| CRPS type associated with specific nerve injury | CRPS II | “Two” = nerve too |
| CRPS type not associated with specific nerve injury | CRPS I | Majority of cases |
CRPS after injury but no specific nerve damage?
CRPS I.
A normally nonharmful stimulus is painful?
Allodynia.
C fiber neurotransmitter association?
Substance P → NK-1.
Avoid in airway laser?
High FiO₂ and nitrous oxide.
⏱️ FIRST Findings + Order Bucket
| Scenario | First/most distinguishing thing | Why it matters |
|---|---|---|
| Serotonin syndrome | Clonus/hyperreflexia | Differentiates from MH/NMS |
| MH | Rising ETCO₂ often early | Hyperthermia can be later |
| Thyroidectomy airway compromise | Neck swelling/hematoma, stridor, respiratory distress | Airway emergency before lab nuance |
| Post-thyroid/parathyroid hypocalcemia | Usually develops over hours; paresthesias/tetany/QT changes | Do not expect every symptom immediately in PACU |
| Airway fire | Remove ETT after stopping gas/ventilation | Burning tube is fuel/source of injury |
| Wind-up | Repetitive stimulation → NMDA/Ca²⁺ | Central sensitization begins the chronic loop |
| Older adult induction | Hypotension/desaturation | Reduced reserve + drug sensitivity |
🎯 Mixed Mini Quiz
Select 2: Which are paired laryngeal cartilages?
Correct: B and D. Paired = arytenoid, corniculate, cuneiform.
Which post-thyroidectomy plan is NOT routinely appropriate?
Correct: A. Awake assessment is valuable because RLN injury/hematoma/airway obstruction matter immediately.
A chronic pain patient has pain from light touch. This is:
Correct: C. Allodynia = nonharmful stimulus perceived as painful.
Select 2: Serotonin syndrome management includes:
Correct: A and C. Also oxygen/intubation/paralysis/sedation if needed and cyproheptadine. Avoid succinylcholine; antipyretics are ineffective.
Which chronic pain intervention uses dorsal column stimulation and gate theory?
Correct: D. Spinal cord stimulators are implantable neuromodulation devices used for refractory pain, CRPS, failed back surgery syndrome.