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Complications in the recovery room
Most problems in the recovery room are in the airway and breathing — obstruction, hypoventilation from residual drugs and laryngospasm — followed by blood pressure, delayed emergence, agitation and pain; all are recognised with a simple question: what has changed since the patient left theatre.
Why it matters in the exam
The exam asks about the causes of hypoxaemia in recovery, airway obstruction and treating laryngospasm, negative-pressure pulmonary oedema, residual neuromuscular blockade and a TOF ratio of 0.9, the causes of delayed emergence, hypotension and hypertension after surgery, emergence agitation, urinary retention, and the Aldrete score for discharge.
Hypoxaemia in recovery comes from hypoventilation (opioids, residual muscle relaxants, volatile agents), upper airway obstruction, atelectasis, aspiration of gastric contents, pulmonary oedema and fluid overload; hypoventilation is recognised by a high carbon dioxide, and opioids are treated with naloxone in small doses. Upper obstruction is opened with jaw thrust and airway adjuncts. In laryngospasm, positive pressure with 100% oxygen is given, anaesthesia is deepened with propofol, and if there is no response — a small dose of succinylcholine. After strong obstruction, breathing against a closed larynx creates negative pressure in the chest and pulmonary oedema. Residual neuromuscular blockade (a TOF ratio below 0.9) causes weakness, poor swallowing and a risk of aspiration, and is treated with sugammadex or neostigmine according to the type of relaxant.
Delayed emergence usually comes from residual drugs, but low glucose, cold, high carbon dioxide, low sodium, residual neuromuscular blockade and stroke must be excluded. Hypotension in recovery comes from lack of volume or bleeding, vasodilation (regional anaesthesia, drugs) or a cardiac problem; hypertension usually comes from pain, a full bladder, high carbon dioxide or hypoxaemia. Emergence agitation is common in children after sevoflurane and in young adults, and before giving a sedative, hypoxaemia, pain and a full bladder are excluded. A urine output below 0.5 mL/kg per hour requires checking first for a blocked catheter and then volume. For discharge from recovery the modified Aldrete score is used, which weighs activity, respiration, circulation, consciousness and saturation (0–2 for each, up to 10), and discharge is usually at a score of 9 or more.
Key points
- The common problem in recovery is in the airway and breathing.
- Laryngospasm: positive pressure, propofol, then succinylcholine.
- A TOF ratio below 0.9 = residual neuromuscular blockade.
- Delayed emergence: drugs, glucose, cold, carbon dioxide, sodium, stroke.
- Discharge by the modified Aldrete, at a score of 9 or more.
Summary table
| Problem | Causes | Treatment and exam point |
|---|---|---|
| Hypoxaemia | Hypoventilation, obstruction, atelectasis, aspiration, oedema | Check carbon dioxide; naloxone for opioids |
| Laryngospasm | Stimulation in light emergence | Positive pressure with 100% oxygen, propofol, then succinylcholine |
| Negative-pressure oedema | Breathing against a closed larynx | Oxygen, positive pressure, usually resolves |
| Residual blockade | A TOF ratio below 0.9 | Sugammadex or neostigmine |
| Delayed emergence | Drugs, low glucose, cold, carbon dioxide, sodium, stroke | Check glucose first |
| Blood pressure | Low: volume, bleeding, vasodilation; high: pain, bladder, carbon dioxide | Find the cause before a drug |
| Low urine output | Below 0.5 mL/kg per hour | Check first for a blocked catheter |
| Discharge | Modified Aldrete, 0–2 for each parameter, up to 10 | Discharge at a score of 9 or more |
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Sources
- Miller's Anesthesia, 9th edition (2020) — The Postanesthesia Care Unit
- Morgan & Mikhail's Clinical Anesthesiology, 7th edition (2022) — Postanesthesia care
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-02. The text may contain errors; when in doubt, check the source.