5.2 Postoperative Recovery, PACU Handover & Complications
Key Takeaways
- Post-Anaesthesia Care Unit (PACU) discharge requires meeting objective criteria (e.g., modified Aldrete score) and delivering a structured ISBAR handover covering intraoperative events, fluid balance, and analgesia timings.
- The standard acute postoperative vital sign monitoring schedule requires INEWS v2 observations every 15 minutes for the 1st hour, every 30 minutes for the next 2 hours, hourly for 4 hours, and 4-hourly thereafter if stable.
- Surgical wound evisceration is an emergency requiring immediate placement in low Fowler's position with knees flexed, covering protruding viscera with sterile saline-soaked dressings, maintaining strict NPO status, and summoning emergency surgical intervention.
- Postoperative urinary retention (POUR) requires bladder scanning when spontaneous micturition has not occurred within 6–8 hours; retention volumes exceeding 400–500 mL mandate aseptic catheterisation to prevent detrusor injury.
- Postoperative haemorrhage is classified into primary (intraoperative), reactionary (within 24 hours as blood pressure normalises), and secondary (7–14 days post-op from infection); expanding neck haematomas post-thyroidectomy require immediate bedside wound release.
Postoperative Recovery, PACU Handover & Complications
Core Clinical Principle: The immediate postoperative period is a high-risk transition during which patients emerge from general anaesthesia, recover protective airway reflexes, and regain cardiovascular homeostasis. Vigilant, structured nursing surveillance using the Irish National Early Warning System (INEWS v2) is paramount. Subtle physiological shifts—such as a widening pulse pressure, a drifting respiratory rate, or unmanaged restlessness—are frequently the earliest harbingers of catastrophic surgical complications.
1. PACU Discharge Criteria & Structured Handover (ISBAR)
Prior to leaving the Post-Anaesthesia Care Unit (PACU), the patient must satisfy stringent clinical discharge criteria (commonly structured via the modified Aldrete Scoring System, requiring a score of 9 or 10):
- Airway & Ventilation: Patent airway without artificial support; respiratory rate 12–20 breaths/min; SpO2 > 95% on room air or returning to pre-op baseline on prescribed supplemental oxygen.
- Cardiovascular Stability: Blood pressure and heart rate within 20% of baseline pre-induction recordings; peripheral perfusion warm with capillary refill time < 2 seconds.
- Consciousness & Protective Reflexes: Fully conscious, oriented, able to obey simple commands, with active gag and cough reflexes intact.
- Comfort & Symptom Control: Pain controlled with numerical rating scale (NRS) < 4; postoperative nausea and vomiting (PONV) absent or well-controlled.
- Surgical Site & Systemic Stability: Surgical dressings dry and intact without expanding haematoma or strike-through; drains patent and draining expected quantities; normothermic (core temperature ≥ 36.0°C).
The Postoperative ISBAR Handover
Upon transfer to the surgical ward, the PACU nurse and receiving ward nurse conduct a formal bedside handover utilizing the standardized ISBAR framework:
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| POSTOPERATIVE ISBAR HANDOVER |
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| I | IDENTIFY | Patient name, date of birth, MRN, primary surgical team, |
| | | and operating consultant. |
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| S | SITUATION | Surgical procedure performed; surgical approach (open vs. |
| | | laparoscopic); anaesthetic technique (GA, spinal, block). |
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| B | BACKGROUND | Significant medical history, allergies, pre-op baseline |
| | | INEWS; intraoperative blood loss volume; IV fluids and |
| | | blood products administered intraoperatively. |
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| A | ASSESSMENT | Current INEWS v2 score; airway patency; oxygen therapy; |
| | | wound site and dressing appearance; drain type and output;|
| | | urinary output; regional block regression (Bromage score);|
| | | last analgesia/antiemetic dose and time of administration.|
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| R | RECOMMEND- | Required observation frequency; specific postoperative |
| | ATION | orders (IV fluids, fasting/diet, mobilization); timing of |
| | | next analgesia and LMWH; escalation thresholds. |
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2. Immediate Postoperative Monitoring Schedule
Postoperative physiological monitoring on acute surgical wards follows a rigorous schedule calibrated to capture early decompensation. In Irish acute hospitals, standard protocol dictates:
[ ARRIVAL ON SURGICAL WARD ]
|
v
+-----------------------+ - Vital signs (INEWS v2: RR, SpO2, BP, HR, AVPU, Temp)
| EVERY 15 MINUTES | - Wound dressing inspection for strike-through
| For the 1st Hour | - Surgical drain volume and colour
+-----------------------+ - Pain score (NRS 0-10) and sedation score
|
v
+-----------------------+ - Monitor urine output (minimum > 0.5 mL/kg/h)
| EVERY 30 MINUTES | - Check IV fluid infusion rate and cannula site
| For the Next 2 Hours | - Re-evaluate pain and comfort
+-----------------------+ - Assess regional anaesthetic motor/sensory block
|
v
+-----------------------+ - Monitor for urinary retention or voiding
| HOURLY | - Check temperature and hydration
| For the Next 4 Hours | - Assess nausea and tolerance of oral fluids
+-----------------------+ - Review cumulative fluid balance
|
v
+-----------------------+ - Routine post-op surveillance if patient remains stable
| EVERY 4 HOURS | - Any trigger on INEWS requires immediate escalation
| Thereafter (if stable)| according to hospital emergency escalation policy
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3. Core Postoperative Complications & Early Nursing Recognition
Respiratory Complications
- Hypoventilation & Airway Obstruction: Residual general anaesthetics, muscle relaxants, or opioids suppress central respiratory drive and relax pharyngeal musculature, causing the tongue to occlude the posterior pharynx. Signs: Snoring, stridor, paradoxical chest-abdominal movements, low SpO2. Nursing Action: Immediate head tilt/chin lift or jaw thrust manoeuvre; lateral recovery position; insert an oropharyngeal (Guedel) or nasopharyngeal airway; administer high-flow oxygen; prepare reversal agents (naloxone for opioids, flumazenil for benzodiazepines, sugammadex/neostigmine for neuromuscular blockade).
- Atelectasis (Alveolar Collapse): The most common cause of early postoperative low-grade fever (within the first 24–48 hours). Caused by shallow breathing, diaphragmatic splinting from surgical pain, and retained secretions. Nursing Action: Provide multimodal analgesia to enable deep breathing and coughing; encourage incentive spirometry; support early ambulation.
- Aspiration Pneumonia: Caused by inhalation of gastric secretions. Presents with tachypnoea, bronchial crackles, bronchospasm, and acute hypoxaemia.
Cardiovascular Complications: Classification of Haemorrhage
Haemorrhage is categorized chronologically, each type having distinct surgical and pathophysiological etiologies:
| Classification | Onset Timing | Underlying Pathophysiological Cause | Clinical Presentation & Management |
|---|---|---|---|
| Primary Haemorrhage | Intraoperative / Immediate | Continuous bleeding occurring during surgery or immediately post-op due to a transected blood vessel, slipping of a ligature, or incomplete cautery. | Frank active bleeding in PACU; immediate surgical re-exploration and haemostatic control. |
| Reactionary Haemorrhage | Within First 24 Hours | Bleeding occurs as the patient's blood pressure recovers to normal physiological levels, dislodging temporary haemostatic thrombi or opening unligated small vessels. | Sudden tachycardia, hypotension, rapid drain filling with frank bright blood, strike-through dressings. Resuscitation and surgical review. |
| Secondary Haemorrhage | 7 to 14 Days Postoperatively | Delayed bleeding caused by localized wound or tissue infection eroding through a vascular wall or breakdown of a vascular suture line. | Often heralded by a small "warning bleed" followed by catastrophic haemorrhage. Requires urgent IV antibiotics and surgical revision. |
[!CAUTION] Life-Threatening Emergency: Post-Thyroidectomy Neck Haematoma An expanding reactionary haematoma in the anterior neck following thyroidectomy or carotid surgery exerts direct pressure on the trachea within a confined fascial compartment. This causes rapid mechanical airway obstruction, acute inspiratory stridor, and asphyxiation. Immediate Nursing Emergency Protocol:
- Call for immediate emergency surgical help and the resuscitation team.
- Immediately release the surgical wound clips or skin sutures at the bedside (using a clip remover kept at the patient's bedside) to evacuate the haematoma and decompress the compressed trachea.
- Administer high-flow oxygen and prepare for emergency re-intubation or tracheostomy.
Wound Complications: Dehiscence & Evisceration
- Wound Dehiscence: The partial or complete separation of the fascial and cutaneous layers of a surgical incision, often preceded by a sudden gush of clear, salmon-pink (serosanguinous) wound fluid between postoperative days 5 and 10.
- Wound Evisceration: A surgical catastrophe where the abdominal fascial layers separate completely and intra-abdominal contents (most commonly loops of small intestine) spill out through the open skin wound.
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| EMERGENCY NURSING ALGORITHM: WOUND EVISCERATION |
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| 1. STAY CALM & REMAIN WITH THE PATIENT |
| - Never leave the patient alone; use the emergency bell to summon help. |
| - Reassure the patient and instruct them not to cough or strain. |
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| 2. IMMEDIATE POSITIONING (LOW FOWLER'S WITH KNEES FLEXED) |
| - Place patient supine with head of bed elevated 15–20 degrees. |
| - Flex knees and place a pillow under the thighs. |
| - Rationale: Relieves intra-abdominal muscular tension on the wound. |
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| 3. PROTECT THE PROTRUDING VISCERA |
| - Cover protruding organs immediately with sterile non-adherent towels |
| or gauze saturated with WARM STERILE NORMAL SALINE (0.9% NaCl). |
| - NEVER ATTEMPT TO PUSH OR FORCE VISCERA BACK INTO THE ABDOMEN! |
| - Rationale: Prevents tissue desiccation, necrosis, and bowel perforation|
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| 4. PREPARE FOR EMERGENCY SURGICAL RE-EXPLORATION |
| - Maintain strict NIL BY MOUTH (NPO) status. |
| - Establish large-bore IV access; begin prescribed IV fluid resuscitation.|
| - Monitor INEWS v2 vital signs continuously (every 5 minutes). |
| - Prepare emergency theater transfer and documentation. |
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Postoperative Urinary Retention (POUR)
Postoperative urinary retention is defined as the inability to void spontaneously despite a full bladder. It occurs due to anaesthetic inhibition of the micturition reflex, parasympathetic blockade from spinal/epidural anaesthesia (S2–S4), systemic anticholinergic and opioid administration, and pelvic surgical dissection.
- Screening Protocol: If the patient has not voided within 6 to 8 hours postoperatively (or post-catheter removal), perform an immediate bedside bladder ultrasound scan.
- Intervention Threshold: An intravesical volume > 400–500 mL indicates significant urinary retention. If non-invasive nursing measures (providing privacy, running warm tap water, assisting male patients to stand upright, warm perineal wash) fail, the nurse must perform an aseptic intermittent (in-and-out) catheterisation to drain the bladder and prevent irreversible overstretching of the detrusor muscle.
Deep Vein Thrombosis (DVT) & Pulmonary Embolism (PE)
- DVT Signs: Unilateral calf tenderness, warmth, erythema, localized pitting oedema, and a discrepancy in calf circumference > 3 cm compared to the unaffected leg. The nurse must never massage or vigorously palpate the calf, as this can dislodge the thrombus into the pulmonary circulation.
- PE Signs: Sudden-onset dyspnoea, sharp pleuritic chest pain, unexplained resting tachycardia, tachypnoea, acute desaturation, apprehension, and haemoptysis. Immediate nursing management: emergency medical alert, high-flow oxygen, positioning in high Fowler's, continuous INEWS monitoring, and urgent computed tomography pulmonary angiogram (CTPA).
Postoperative Hypothermia & Shivering
Core body temperature < 36.0°C. Shivering increases total body oxygen consumption by up to 400%, elevating myocardial work, precipitating cardiac ischaemia, causing metabolic lactic acidosis, and impairing enzymatic coagulation cascades (increasing surgical bleeding). Management involves active re-warming with forced-air warming blankets (e.g., Bair Hugger) and warmed intravenous fluids.
Postoperative Nausea & Vomiting (PONV)
PONV is triggered by volatile anaesthetics, opioids, gastrointestinal manipulation, and dehydration. Risk stratification uses the Apfel Risk Score (female gender, non-smoking status, history of motion sickness/PONV, postoperative opioids; each adds 20% risk).
- First-Line Antiemetics in Ireland:
- 5-HT3 Antagonists (Ondansetron 4 mg IV): Highly effective; caution regarding cardiac QT interval prolongation.
- Antihistamines / Anticholinergics (Cyclizine 50 mg IV/IM): First-line agent in Ireland for opioid-induced nausea and vestibular motion sensitivity; may cause tachycardia.
- Dopamine Antagonists (Metoclopramide 10 mg IV, Prochlorperazine 12.5 mg IM): Prokinetic action; contraindicated in mechanical bowel obstruction or GI perforation. Caution: risk of acute dystonic extrapyramidal reactions in young patients.
4. Postoperative Drain Management & Fluid Balance
Surgical drains evacuate accumulated blood, lymph, bile, or purulent exudate from anatomical dead spaces, preventing haematoma and abscess formation.
| Drain Type | Mechanism of Action | Common Clinical Uses | Nursing Monitoring & Maintenance |
|---|---|---|---|
| Closed Suction Drain<br>(Jackson-Pratt, Redivac) | Maintains active negative pressure vacuum using an evacuated bulb or spring-loaded chamber. | Orthopaedic arthroplasty, mastectomy, thyroid, abdominal surgery. | Empty using aseptic non-touch technique (ANTT); measure exact volume; re-compress bulb/chamber before closing port to re-establish active vacuum suction. |
| Open / Passive Drain<br>(Corrugated rubber, Penrose) | Drains by gravity and capillary action into overlying sterile absorbent dressings. | Perianal abscess drainage, contaminated abdominal cavities. | Maintain sterile barrier dressing; monitor strike-through; secure with sterile safety pin to prevent inward retraction. |
Assessment of Drain Output
- Colour Progression: Normal post-surgical drainage transitions systematically from frank blood (immediate post-op) → haemoserous (pink/orange watery exudate over 24–48 hours) → serous (clear, straw-coloured fluid).
- Haemorrhage Alert Threshold: Sudden drainage of > 100–200 mL/hour of fresh bright red blood over two consecutive hours indicates active primary or reactionary haemorrhage, requiring immediate surgical escalation.
- Sudden Cessation of Drainage: If drainage abruptly drops to zero in a previously high-output drain accompanied by increasing surgical site swelling, tension, and pain, suspect a blocked or clot-occluded drain tube. Never flush a surgical drain unless explicitly ordered by the operating surgeon.
- Strike-Through Dressings: If exudate soaks through the outer surgical dressing, do not remove the initial dressing within the first 48 hours unless active bleeding is suspected. Reinforce the dressing with sterile absorbent pads, mark the perimeter of the exudate with a surgical pen, record the date and time, and alert the surgical team.
On the second postoperative day following an open abdominal aortic aneurysm repair, a 64-year-old patient coughs vigorously and cries out in pain, stating that their incision feels like it 'completely gave way.' Upon removing the bedsheet, the nurse observes that the lower half of the abdominal dressing is soaked with serosanguinous fluid and multiple loops of small bowel are protruding onto the abdominal wall. What is the immediate priority sequence of nursing actions?
A 42-year-old patient is 3 hours post-total thyroidectomy on the surgical ward. The patient calls the nurse complaining of neck tightness and progressive difficulty breathing. The nurse observes rapid, tense swelling beneath the neck incision, inspiratory stridor, a respiratory rate of 28 breaths/min, and a heart rate of 118 bpm. What is the nurse's priority emergency action?
A 58-year-old male is 7 hours post-elective open inguinal hernia repair performed under spinal anaesthesia. He has received 1,500 mL of intravenous fluids intraoperatively and postoperatively. He reports lower abdominal fullness and discomfort but has been unable to pass urine since returning to the ward. A bedside bladder ultrasound reveals an intravesical urine volume of 580 mL. What is the appropriate evidence-based nursing intervention?