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Using millers anaesthesiology book discuss in detail without missing important scores, classifications, tables, relevant things to remember as a MD anaesthesia student, about the following topics - anaesthetic management of a patient with SDH with midline shift on conservative management from neurosurgery side now posted for both bone fracture right leg

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This comprehensive discussion is drawn entirely from Miller's Anesthesia, 10th Edition (Chapters 53, 43, 62, and 80). Here are the key take-home points structured for your MD exam:

Quick Recall Framework

The 3 Cardinal Questions Before This Anaesthetic

  1. Is the ICP currently dangerous? (CT: midline shift = compensatory reserve depleted; GCS trend)
  2. How much time since the SDH? (Delayed deterioration risk up to 4–4.5 days)
  3. How long and demanding is the orthopaedic procedure? (Long surgery prone = higher ICP risk)

The Non-Negotiables

❌ NEVER✅ ALWAYS
Hypotension (SBP <90 doubles mortality)CPP 60–70 mmHg
N₂O (↑ICP, expands pneumatoceles)Normocapnia PaCO₂ 35–38 mmHg
Hypotonic fluids (worsen oedema)Isotonic fluids only
Steroids in TBI/SDH (↑mortality — CRASH trial)Head-up 30°, no neck rotation
Albumin in TBI (↑mortality — SAFE trial)ICP monitor if GCS <15 + CT lesion + surgery within 48h
Prolonged prophylactic hyperventilationNormothermia (hypothermia: no benefit — EUROTHERM)
Succinylcholine (↑ICP risk)Rocuronium for RSI
Etomidate post-TBI (seizures, adrenal suppression)Propofol TIVA as preferred maintenance

Scores to Know

  • GCS (3–15): <8 = intubate; <15 + CT lesion = ICP monitor for surgery within 48h
  • WFNS Scale (Grade 1–5): based on GCS + motor deficit
  • Fisher/Modified Fisher Scale: CT grading of SAH blood (relevant if traumatic SAH component)
  • ISS (Injury Severity Score): >15 = major trauma; FES more likely in high-ISS patients
  • Gurd's Criteria and Schonfeld Score (≥5 points) for Fat Embolism Syndrome

The Unique FES Risk

Long-bone fracture manipulation causes fat and marrow microembolism in virtually all patients. In your patient with an existing SDH, the CNS component of FES will be unmasked only as failure to wake up from GA — making the diagnosis harder and the consequences worse.

Using millers anaesthesiology book discuss in detail, relevant tables, numerical data, scores, scales and classifications which are important in cadaveric transplantation and extraction of multiple organs

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This is a complete, exam-ready discussion drawn entirely from Miller's Anesthesia, 10th Edition (Chapters 56, 57, 73, 80). Here's your quick orientation to the structure:

How to Use This for Exam Preparation

The 5 Pillars of This Topic:
  1. Brain Death — Harvard criteria (1968), prerequisites, clinical exam, apnea test (PaCO₂ must rise to ≥60 mmHg), ancillary tests, and the critical distinction between DBD and DCD
  2. Maastricht Classification (I–IV) + UW DCD Score (8–24) — These scores define the DCD donor pool and predict organ usability; Maastricht III & IV = controlled DCD (most used)
  3. Pathophysiology of Brain Death (Table 57.1) — The incidence figures are high-yield: hypertension AND hypotension both at 80–90%, DI at 45–90%, DIC at 30–55%. The two-phase cardiovascular response (catecholamine storm → vasoplegia) drives all donor management decisions
  4. MELD Score — The cornerstone of liver allocation and a direct predictor of surgical complexity; MELD >35 = high-risk anaesthesia territory with mandatory massive transfusion preparedness
  5. Procurement Anaesthesia — Only for DBD; organs removed heart-first, kidneys-last; atropine DOES NOT WORK for bradycardia (use isoproterenol); neuromuscular blockers for spinal reflexes; volatile agents preferred (ischaemic preconditioning benefit); heparin before cross-clamping
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