Ch8: Pain Management *Extracted from comprehensive anesthesia notes.* #Preparatory Mindset Focus on: physiologic effects of anesthesia, drug mechanisms, airway management, and complication recognition. Exam questions often test classification systems (ASA, airway assessment) and complication management. #Core Concepts **2. Anesthesia Complications** **A. Epidural/Spinal Complications** **1. Hypotension: Sympathetic block; prevent with preloading/Trendelenburg; treat with fluids +** - ephedrine/phenylephrine **2. Total Spinal: Emergency! Apnea, severe hypotension; treat with intubation + CPR + vasopressors** > **Key Point:** () > **Key Point:** 3. LAST (Local Anesthetic Toxicity): Tinnitus, seizures, VF; treat with 20% Intralipid () **4. PDPH: Positional headache; treat with hydration/caffeine → epidural blood patch** **5. Epidural Hematoma: Severe back pain + weakness; 8-h window for laminectomy** **B. General Anesthesia Complications** **1. Hypotension: Hypovolemia/anesthetic depression; treat with fluids + phenylephrine** **2. Hypertension: Anesthesia depth inadequate; treat with deeper anesthesia + beta-blockers** **3. Myocardial Ischemia: Supply < demand; avoid tachycardia/hypotension** **4. Airway Obstruction: Tongue fall/secretions; jaw thrust + airway adjunct** **5. Bronchospasm: Treat with 100% O₂ + albuterol + steroids** **6. Delayed Awakening: Residual drugs/hypoglycemia/hypothermia** **7. Intraoperative Awareness: Paralyzed but conscious; prevent with BIS/MAC monitoring** **C. Regional Block Complications** **1. Pneumothorax: Supraclavicular risk; chest tube if >20%** **2. Phrenic Nerve Block: Interscalene 100% incidence; monitor O₂** **3. Horner Syndrome: Ptosis, miosis; self-limiting** **4. Nerve Injury: Ultrasound guidance reduces risk** **D. Critical Emergencies** > **Key Point:** • PTE: Intraoperative hypotension + hypoxemia; treat with intubation + heparin () **Key Takeaways** - • Crystalloids first-line, colloids for specific cases - • Master 4/2/1 rule for fluid calculation - • Prevention > treatment; monitor vital signs closely - • Emergencies: Total spinal, LAST, PTE require immediate action **1. Definition of Pain** - • IASP 2020 revised definition: An unpleasant sensory and emotional experience associated with, or - resembling that associated with, actual or potential tissue damage. > **Key Point:** 2. Key Pain Terms () - • Allodynia: Pain from non-noxious stimuli. - • Analgesia: No pain perception. - • Hyperalgesia: Increased pain response to noxious stimuli. - • Neuralgia: Pain along a nerve distribution. - • Paresthesia: Abnormal sensation without stimulus. **3. Types of Pain** #High-Yield Points - ASA classification is a must-know for exam - Understand differences between general vs regional anesthesia - Complications and their management are frequently tested - Know the Mallampati score and airway assessment criteria

Subject:

*Extracted from comprehensive anesthesia notes.*

Preparatory Mindset

Focus on: physiologic effects of anesthesia, drug mechanisms, airway management, and complication recognition. Exam questions often test classification systems (ASA, airway assessment) and complication management.

Core Concepts

2. Anesthesia Complications

A. Epidural/Spinal Complications

1. Hypotension: Sympathetic block; prevent with preloading/Trendelenburg; treat with fluids +

ephedrine/phenylephrine

2. Total Spinal: Emergency! Apnea, severe hypotension; treat with intubation + CPR + vasopressors

Key Point: ()

Key Point: 3. LAST (Local Anesthetic Toxicity): Tinnitus, seizures, VF; treat with 20% Intralipid ()

4. PDPH: Positional headache; treat with hydration/caffeine → epidural blood patch

5. Epidural Hematoma: Severe back pain + weakness; 8-h window for laminectomy

B. General Anesthesia Complications

1. Hypotension: Hypovolemia/anesthetic depression; treat with fluids + phenylephrine

2. Hypertension: Anesthesia depth inadequate; treat with deeper anesthesia + beta-blockers

3. Myocardial Ischemia: Supply < demand; avoid tachycardia/hypotension

4. Airway Obstruction: Tongue fall/secretions; jaw thrust + airway adjunct

5. Bronchospasm: Treat with 100% O₂ + albuterol + steroids

6. Delayed Awakening: Residual drugs/hypoglycemia/hypothermia

7. Intraoperative Awareness: Paralyzed but conscious; prevent with BIS/MAC monitoring

C. Regional Block Complications

1. Pneumothorax: Supraclavicular risk; chest tube if >20%

2. Phrenic Nerve Block: Interscalene 100% incidence; monitor O₂

3. Horner Syndrome: Ptosis, miosis; self-limiting

4. Nerve Injury: Ultrasound guidance reduces risk

D. Critical Emergencies

Key Point: • PTE: Intraoperative hypotension + hypoxemia; treat with intubation + heparin ()

Key Takeaways

• Crystalloids first-line, colloids for specific cases

• Master 4/2/1 rule for fluid calculation

• Prevention > treatment; monitor vital signs closely

• Emergencies: Total spinal, LAST, PTE require immediate action

1. Definition of Pain

• IASP 2020 revised definition: An unpleasant sensory and emotional experience associated with, or

resembling that associated with, actual or potential tissue damage.

Key Point: 2. Key Pain Terms ()

• Allodynia: Pain from non-noxious stimuli.

• Analgesia: No pain perception.

• Hyperalgesia: Increased pain response to noxious stimuli.

• Neuralgia: Pain along a nerve distribution.

• Paresthesia: Abnormal sensation without stimulus.

3. Types of Pain

High-Yield Points

ASA classification is a must-know for exam

Understand differences between general vs regional anesthesia

Complications and their management are frequently tested

Know the Mallampati score and airway assessment criteria

Anesthesia Notes

Preparatory Mindset

Core Concepts

High-Yield Points