# At the end of surgery, the anesthesiologist orders sugammadex 4 mg/kg IV. Which is the most accurate explanation of this medication's role?

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> language: en  
> subject: Medical Emergencies  
> category: PA

## Question

At the end of surgery, the anesthesiologist orders sugammadex 4 mg/kg IV. Which is the most accurate explanation of this medication's role?

## Option

1. Selectively binds and inactivates rocuronium and vecuronium for rapid reversal of neuromuscular blockade — faster and more complete than neostigmine + glycopyrrolate **✔ Correct answer**
2. Selectively binds succinylcholine in the plasma to reverse depolarizing neuromuscular blockade, leading to rapid return of spontaneous ventilation and muscle activity.
3. Reverses opioid-induced respiratory depression and sedation by competitively binding to mu-opioid receptors, facilitating rapid awakening after surgery.
4. Treats malignant hyperthermia by inhibiting ryanodine receptors to reduce calcium release from the sarcoplasmic reticulum, preventing muscle rigidity and hyperthermia.

**Correct answer: 1**

## Explanation

Correct (2): Sugammadex is a modified cyclodextrin that encapsulates rocuronium/vecuronium, removing them from neuromuscular junctions. Faster, more complete than neostigmine. Effective even for deep block. Does NOT reverse benzylisoquinoliniums (cisatracurium). (1) Succinylcholine self-metabolized by pseudocholinesterase. (3) Naloxone. (4) Dantrolene.

## In-depth explanation

Memory Tip Sugammadex = "Sugar wraps the Roc/Vec." Old reversal = neostigmine + glycopyrrolate. Sugammadex binds estrogen-based OCs — backup contraception for 1 week.

## Clinical scenario

Scenario 50-year-old female at end of laparoscopic surgery received rocuronium; anesthesiologist orders sugammadex 4 mg/kg IV before extubation.

## Key concepts

- **Sugammadex** — Cyclodextrin chelator; selectively reverses rocuronium and vecuronium.
- **Neostigmine reversal** — Acetylcholinesterase inhibitor + glycopyrrolate; older reversal for non-depolarizing NMBA.
- **Sugammadex-OC interaction** — Binds progestins/estrogens; backup contraception for 7 days.

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