[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [Nursing](https://durgical.com/en/nursing/) › [Perioperative nursing](https://durgical.com/en/nursing/areas/perioperative/) › Immediate recovery after anaesthesia: monitoring and discharge criteria

# Immediate recovery after anaesthesia: monitoring and discharge criteria

- Assessment

In the recovery room the nurse watches breathing first, then circulation, consciousness, pain and nausea, until the patient is stable enough to leave.

Updated Nov 12, 2026

## Key points

- Airway and breathing first: patency, respiratory rate, effort and oxygen saturation.
- Monitor at short intervals: vital signs, saturation, consciousness, temperature, pain, nausea, wound, drains and urine output.
- Modified Aldrete score: five areas (activity, respiration, circulation, consciousness, oxygen saturation), each 0 to 2; 9 or more usually allows discharge.
- Other tools add pain, nausea and vomiting, and bleeding; the institution chooses the score and its rules.
- Prevent and treat hypothermia with warming devices and blankets; hypothermia is linked to infection and bleeding problems.
- Call at once for airway obstruction, falling saturation, slow breathing, low blood pressure, heavy bleeding or a patient who does not wake.

## What it is

The post-anaesthesia care unit (PACU, recovery room) receives the patient straight from the operating room. Anaesthetic and opioid effects are still present, so the airway and breathing come first. The nurse receives the handover from the anaesthesia and surgical team, monitors vital signs and oxygen saturation at short intervals, checks the wound, drains and level of consciousness, and treats pain, nausea and low temperature as ordered. Discharge from the unit follows a recovery score such as the modified Aldrete score, which rates activity, breathing, circulation, consciousness and oxygen saturation; a total of 9 or more out of 10 usually means the patient is ready, together with the institution's own criteria.

## Reference values

- Modified Aldrete score: 0 to 10; 9 or more usually means ready to leave the recovery unit.
- Circulation is judged against the patient's own blood pressure before anaesthesia, not against a fixed number.
- Vital signs are compared with the patient's own baseline and with the protocol / NEWS2 parameters (see the routine vital signs and early warning score pages). For full Aldrete points, saturation must be above 92 % on room air.
- Pain and nausea are not part of the original Aldrete score, so they are checked separately before discharge.

## What you need

- Oxygen source, suction, bag-valve-mask and airway adjuncts ready at the bedside.
- Monitor with pulse oximetry, blood pressure and ECG; a thermometer.
- Warming blankets or devices.
- The handover from anaesthesia and surgery, the orders and the recovery score sheet.

## How to measure it (and why)

- Check airway, breathing and saturation as the patient arrives: residual anaesthesia can cause obstruction or slow breathing.
- Receive the handover (procedure, anaesthesia, fluids, blood loss, problems, orders): it guides what to watch.
- Record vital signs and saturation at the interval in protocol, usually every few minutes at first: early changes are caught.
- Assess consciousness and the ability to move the limbs: they show the anaesthesia is wearing off.
- Look at the dressing, drains and urine output: bleeding or low output may be the first sign of trouble.
- Measure temperature and warm the patient if cold: hypothermia causes shivering, bleeding and discomfort.
- Assess pain with a scale and nausea, and treat them as ordered: both delay recovery and discharge.
- Score recovery with the institution's tool and repeat it: the trend shows when the patient is ready.
- Hand over to the ward with SBAR when criteria are met: the ward nurse needs the full picture.

## How to read it

- Airway obstruction can occur as the patient emerges from anaesthesia; keep oxygen, suction and a bag-valve-mask ready at the bedside.
- A fast heart rate with falling blood pressure and anxiety may mean significant blood loss.
- A score of 9 or more is necessary but not enough: pain, nausea, bleeding and the patient's own baseline must also be acceptable.
- Pulse oximetry in the recovery room reduces episodes of low oxygen (WHO); keep it on until discharge criteria are met.

## Next step: when to call for help

- Call at once (anaesthesia team): airway obstruction, apnoea or slow breathing, saturation falling despite oxygen, a patient who does not wake as expected.
- Call promptly: low or very high blood pressure, a new arrhythmia, heavy bleeding or a rapidly swelling wound, very low urine output.
- Call: pain or nausea that does not respond to the ordered treatment, temperature that stays low despite warming.
- Do not discharge if the score or the institutional criteria are not met; record and report the reason.

## Test yourself

Think of the answer, then tap the question to see it.

## What is the first priority when a patient arrives in the recovery room?

The airway and breathing: patency, respiratory rate and effort, and oxygen saturation, because residual anaesthesia can cause obstruction or slow breathing.

## Which five areas does the modified Aldrete score assess?

Activity, respiration, circulation, consciousness and oxygen saturation, each scored from 0 to 2.

## What total on the modified Aldrete score usually allows discharge from the recovery unit?

A score of 9 or more out of 10, together with the institution's criteria such as acceptable pain, nausea and bleeding.

## Why is hypothermia treated in the recovery room?

Because it causes shivering and discomfort and is linked to bleeding problems and surgical site infection; warming devices and blankets are used.

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## Connections

## Related 6

- [Postoperative care on the ward: the first 24–48 hours](https://durgical.com/en/nursing/postoperative-care-on-the-ward-the-first-24-48-hours/)
- [Vital signs in nursing: when, how often and how to record them](https://durgical.com/en/nursing/vital-signs-in-nursing-when-how-often-and-how-to-record-them/)
- [Early warning scores (NEWS2) and when to escalate](https://durgical.com/en/nursing/early-warning-scores-and-when-to-escalate/)
- [Pulse oximetry at the bedside: placement and pitfalls](https://durgical.com/en/nursing/pulse-oximetry-at-the-bedside-placement-and-pitfalls/)
- [Pain assessment scales: numeric, visual analogue, faces, behavioural (FLACC) and in dementia](https://durgical.com/en/nursing/pain-assessment-scales-numeric-visual-analogue-faces-behavioural-and-in-dementia/)
- [Handoff and SBAR communication](https://durgical.com/en/nursing/handoff-and-sbar-communication/)

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Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.

Sources: [Post-anesthesia recovery: a comprehensive review of SAMPE, modified Aldrete, and White scoring systems](https://europepmc.org/article/PMC/PMC11537198) (Cureus, open access (Europe PMC), 2024); [WHO guidelines for safe surgery 2009: safe surgery saves lives](https://www.who.int/publications-detail-redirect/9789241598552) (World Health Organization (WHO), 2009); [Global guidelines for the prevention of surgical site infection, second edition](https://www.who.int/publications/i/item/9789241550475) (World Health Organization (WHO), 2018); [Consensus statement for perioperative care in total hip replacement and total knee replacement surgery: Enhanced Recovery After Surgery (ERAS) Society recommendations](https://europepmc.org/article/PMC/PMC7006728) (Acta Orthopaedica, open access (Europe PMC), 2020).

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Representative model, for educational purposes only.

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License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/nursing/immediate-recovery-after-anaesthesia-monitoring-and-discharge-criteria/