Post-Op Monitoring Checklist — What Student Nurses Need to Check After Surgery

The first hour — receiving a patient from theatre

When a patient returns to the ward from the post-anaesthesia care unit (PACU), a structured handover and rapid primary assessment are essential. The anaesthetic and recovery nursing team will have been monitoring the patient continuously since the end of surgery; your job is to take on that responsibility without any gap in observation. The goal of the first hour is to establish a stable baseline, identify any acute deterioration, manage pain and nausea effectively, and ensure the patient's airway, breathing, and circulation remain safe.

PACU handover — what to receive and confirm

The PACU nurse or anaesthetist will hand over the patient using a structured format. As the receiving nurse, you should actively confirm each of the following items rather than passively listening. Many trusts use a standardised PACU handover proforma — use it. If one is not available, the checklist below covers the minimum:

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  Patient identity: Confirm name, date of birth, and hospital number against the wristband and notes.
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  Procedure performed: Confirm the exact procedure, the side/site if applicable, and whether any complications occurred intraoperatively.
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  Anaesthesia type: General, regional (spinal/epidural), or local with sedation. This affects your neurological and pain assessment approach.
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  Vital sign trends: Review the anaesthetic chart for baseline pre-op BP, HR, and SpO₂ — you need these to identify what is "normal" for this patient post-op.
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  Fluids and blood loss: Total IV fluids administered intraoperatively, estimated blood loss (EBL), urine output in theatre, and any blood transfusion given.
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  Current IV access: Number, size, and site of cannulae; any central or arterial lines; patency of each.
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  Medications given: All opioids (dose, time, total), antiemetics, reversal agents (neostigmine/sugammadex), antibiotics, and any vasopressors.
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  Airway: Any airway difficulties during intubation, current airway (natural, LMA still in situ), and oxygen requirement on departure from PACU.
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  Drains and catheters: Type, site, and current output of each drain; whether a urinary catheter is in situ and urine output since insertion.
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  Post-op orders: Oxygen therapy prescription, analgesia regimen, IV fluids prescription, mobilisation plan, and any specific monitoring instructions from the surgical or anaesthetic team.
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  Concerns: Any specific concerns from the PACU nurse — fragility, allergy reactions, intraoperative hypotension, patient anxiety or distress.

ABCDE assessment on arrival

Once handover is complete and the patient is connected to your ward monitoring equipment, perform a structured ABCDE assessment immediately. Do not assume the patient is stable because they have just left PACU — deterioration can occur during transfer, and some complications (reactionary haemorrhage, laryngospasm after extubation, PONV leading to aspiration risk) manifest in the first 15–30 minutes back on the ward.

Oxygen therapy post-operatively

Oxygen therapy must always be prescribed. The default post-operative target SpO₂ is 94–98% for most patients. For patients with known COPD or hypoxic drive, the target is typically 88–92% — confirm this from the prescription and the patient's documented baseline. Never assume a post-op patient should receive high-flow oxygen without a prescription; equally, never withhold oxygen from a patient with falling saturations in order to wait for a prescription — in an emergency, give oxygen and document.

Common causes of post-operative hypoxia include: residual neuromuscular blockade (shallow breathing), opioid-induced respiratory depression, atelectasis from prolonged general anaesthesia, pneumothorax (rare but catastrophic), and pulmonary embolism (rare in immediate post-op period but escalating risk thereafter). If SpO₂ does not respond to supplemental oxygen, escalate immediately.

Blood pressure and heart rate — interpreting trends

A single blood pressure reading means little without context. What you are looking for is a trend. Compare the patient's first post-op readings to: (a) their pre-operative baseline, and (b) their intraoperative trend from the anaesthetic record. Post-operative hypotension (systolic BP below 90 mmHg or more than 20% below baseline) may indicate hypovolaemia from blood loss, vasodilation from residual anaesthetic agents, or a distributive process such as sepsis. Post-operative hypertension is also common — caused by pain, anxiety, bladder distension, or stopping antihypertensive medication pre-operatively. Both require prompt assessment and documentation.

Tachycardia (HR above 100 bpm) in the post-op patient should always be investigated: pain, anxiety, hypovolaemia, fever, and pulmonary embolism are all on the differential. Tachycardia with hypotension together suggest haemodynamic instability and require immediate escalation.

The post-op monitoring checklist

The frequency and content of post-operative monitoring should follow your trust's protocol and the post-op orders from the surgical team. The table below gives a standard framework used across most UK surgical wards. Always check for any procedure-specific or patient-specific instructions in the post-op orders — some procedures (e.g. vascular surgery, major bowel resection, carotid endarterectomy) carry enhanced monitoring requirements.

Drain monitoring — what to record

Surgical drains are placed to allow collection and measurement of fluid that would otherwise accumulate within the wound or body cavity. Understanding what is "normal" for a given drain type and surgical procedure is essential — deviation from expected output is often the first clinical sign of a complication.

For each drain, record the following on the fluid balance chart: cumulative output per shift (not just what you observed), colour and consistency (serosanguinous is expected early post-op; frank red blood is not), and whether the drain is patent and draining. A closed vacuum drain (e.g. Redivac or Hemovac) should be actively collecting — loss of suction may indicate the drain is blocked or the connection has failed. An open drain (e.g. Robinson drain) relies on gravity and capillary action.

Fluid balance — calculating and documenting

An accurate fluid balance is a safety-critical document. It tells the surgical team whether the patient is fluid-overloaded (risk of pulmonary oedema, anastomotic breakdown) or fluid-depleted (risk of post-operative AKI, hypotension). All input must be recorded: IV crystalloids and colloids, blood products, oral fluid intake, enteral feed, and any medication given in fluid (e.g. IV antibiotics in 100 ml bags). All output must be recorded: urine (catheter bag volumes or commode estimated), drain output, nasogastric aspirate, stoma output, and any documented emesis.

The shift-total and running 24-hour total must both be documented. A cumulative positive balance of more than 3 litres in 24 hours or a cumulative negative balance of more than 1.5 litres in 24 hours should prompt medical review, even in the absence of haemodynamic instability.

Red flags — when to escalate immediately

Recognising deterioration early and escalating promptly is one of the most important skills in surgical nursing. The following parameters and clinical findings are red flags that require immediate escalation — to the nurse in charge and then to the surgical team or rapid response team as appropriate. Do not delay to "watch for another observation cycle." With post-operative patients, deterioration can be rapid.

Primary vs secondary post-operative haemorrhage

Primary haemorrhage occurs within 24 hours of surgery. It is most commonly caused by a slipped ligature, inadequate haemostasis, or coagulopathy (e.g. in a patient who had pre-operative anticoagulation). Signs include tachycardia, hypotension, pallor, frank blood from the wound or drain, and a falling urine output. It is a surgical emergency — escalate immediately, establish IV access, and prepare for potential return to theatre.

Secondary haemorrhage typically occurs 7–14 days post-operatively and is caused by infection eroding a vessel wall at the operative site. The presentation may be more insidious: increasing wound discharge that becomes blood-stained, or a sudden bleed that appears later in the recovery period. Secondary haemorrhage should be treated with the same urgency as primary haemorrhage. Both types require immediate escalation, accurate documentation of blood loss, and activation of your trust's major haemorrhage or emergency surgical pathway if bleeding is significant.

Recognising post-operative respiratory compromise

Respiratory rate is the single most sensitive indicator of early deterioration — yet it is the observation most frequently under-recorded or estimated rather than counted. A rising respiratory rate (above 20 bpm) is often the first sign of pain, haemorrhage, pulmonary embolism, or early sepsis. Opioid-induced respiratory depression (RR below 8 bpm, pinpoint pupils, reduced consciousness) is a medical emergency requiring immediate escalation and potential reversal with naloxone — do not leave the patient, call for help immediately.

Documentation — what to record and when

Accurate, contemporaneous documentation is not administrative paperwork — it is a clinical safety tool. The observation chart, fluid balance chart, and nursing notes form the legal record of care, and they allow the next nurse and the surgical team to see exactly what happened and when. Incomplete documentation means incomplete care.

Using the NEWS2 chart correctly

The NEWS2 chart provides a standardised, colour-coded record of physiological track-and-trigger. Each parameter has a numerical score (0, 1, 2, or 3) based on how far it deviates from normal. The total score drives the escalation response. When completing the NEWS2 chart, record each individual parameter score, not just the total. A total of 5 achieved by five parameters each scoring 1 carries a very different clinical meaning from a total of 5 achieved by one parameter scoring 3 and two scoring 1 — the latter demands immediate escalation regardless of total.

Always record the observations that were taken — never omit a parameter because you did not check it. If an observation was not taken (e.g. temperature could not be obtained), document why. Never falsify or backfill observation charts.

Recording drain output on the fluid balance chart

Each drain should have its own column on the fluid balance chart, clearly labelled by site (e.g. "Right axillary drain," "Abdominal drain — left iliac fossa"). Record the cumulative volume and the volume for the current period. Note colour changes — use descriptive language: "serosanguinous," "serous," "haemosanguinous," or "frank blood." Do not use terms like "normal" or "usual" — describe what you observe so that the next clinician reading the notes can form their own judgment.

Writing a post-op nursing note

At minimum, a post-op nursing note must be written on arrival to the ward and at the end of your shift. The note must include: the time of return from theatre, the PACU handover summary, the initial ABCDE assessment findings, any interventions performed (oxygen applied, analgesia given, antiemetic administered), pain score at rest and on movement, drain and wound status, urine output, any escalation carried out and the response received, and the patient's level of comfort and orientation.

Write in objective, clinical language. Avoid vague terms such as "settled" or "comfortable" without supporting clinical data. Write "Patient rated pain 2/10 at rest and 5/10 on coughing. SpO₂ 96% on 2L/min via nasal cannula. Drain producing 30 ml serosanguinous fluid per hour. Patient alert and orientated to person and place" rather than "Patient comfortable and observations stable."

The SBAR written escalation note

When you escalate a concern in writing (e.g. in a nursing note following a phone call to the doctor, or in an electronic referral), use the SBAR framework. This ensures all relevant clinical information is communicated in a structured, concise format. A written SBAR note also provides a contemporaneous record that the escalation occurred and what information was shared.

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