Premedication Goals & Gains - Smooth Sailing Start
- Core Psychological Goals (📌 ASAP):
- Anxiolysis: Alleviate anxiety, induce calm.
- Sedation: Ensure patient cooperation.
- Amnesia: Anterograde, prevent recall of events.
- Pain relief (Analgesia): Preemptive, reduce discomfort.
- Physiological & Protective Aims:
- Antisialagogue: Dry secretions, clear airway.
- Reflex Attenuation: Blunt adverse sympathetic/vagal responses.
- Aspiration Prophylaxis: ↓ gastric volume, ↑ gastric pH.
- PONV Prophylaxis: Prevent postoperative nausea/vomiting.
- Anesthetic Facilitation & Gains:
- Smooth induction/emergence, ↓ overall anesthetic needs.
- Enhanced patient satisfaction & comfort, ↓ perioperative morbidity.
⭐ Benzodiazepines (e.g., Midazolam 0.02-0.1 mg/kg IV/IM) are prime choices for effective anxiolysis and anterograde amnesia.
Key Premed Drugs - The Anxiolytic Arsenal
| Drug Class | Examples | Key Effects | Common Adult Oral/IV Dose Range | Key Adverse Effects/Contraindications |
|---|---|---|---|---|
| Benzodiazepines | Midazolam, Diazepam, Lorazepam | Anxiolysis, sedation, amnesia, anticonvulsant. | Midazolam: Oral 7.5-15 mg, IV 0.02-0.1 mg/kg. Diazepam: PO 5-10 mg. Lorazepam: PO 1-2 mg. | Resp. depression (esp. w/ opioids), paradoxical agitation. Caution: elderly, glaucoma. Reversal: Flumazenil. |
| α₂-Agonists | Clonidine, Dexmedetomidine | Anxiolysis, sedation, analgesia, sympatholysis (↓HR, ↓BP), ↓MAC. | Clonidine: PO 100-200 mcg. Dexmedetomidine: IV load 0.5-1 mcg/kg. | Bradycardia, hypotension, sedation. Avoid abrupt withdrawal (rebound HTN). |
| Beta-Blockers | Metoprolol, Atenolol | ↓HR, ↓BP, ↓myocardial O₂ demand, mild anxiolysis. | Metoprolol: PO 25-100 mg. Atenolol: PO 25-50 mg. | Bradycardia, hypotension, bronchospasm (non-selective), heart block. |
Tailored Premedication - Patient-First Protocols
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Timing & Routes - The Pre-Op Playbook
- Oral (PO):
- Administer 60-90 min pre-op.
- Most common, patient comfort.
- Allows sips of water.
- Intravenous (IV):
- Administer 5-10 min pre-op or at induction.
- Rapid onset, ideal for immediate effect.
- Titratable dosage.
- Intramuscular (IM):
- Administer 30-60 min pre-op.
- Use if PO/IV routes are challenging.
- Slower, less predictable absorption than IV.
⭐ Midazolam is a common IV premedicant due to its rapid onset (2-5 min) and short duration of action.
High‑Yield Points - ⚡ Biggest Takeaways
- Primary goals: anxiolysis, sedation, analgesia, amnesia, antisialagogue effect, and aspiration prophylaxis.
- Benzodiazepines (e.g., midazolam) for anxiolysis/amnesia; reversed by flumazenil.
- Opioids (e.g., fentanyl) for analgesia; risk of respiratory depression, reversed by naloxone.
- Anticholinergics (e.g., glycopyrrolate) to ↓ secretions and manage bradycardia.
- Aspiration prophylaxis: H2 blockers (ranitidine), PPIs (omeprazole), and prokinetics (metoclopramide).
- Antiemetics like ondansetron (5-HT3 antagonist) or dexamethasone for preventing PONV (Postoperative Nausea and Vomiting).
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