Pain, PONV, Temperature, and Comfort Interventions

Pain Is an Assessment, Not Just a Score

A numeric pain rating is useful only when paired with procedure, baseline status, sedation level, respiratory rate, blood pressure, allergies, regional blocks, chronic opioid use, and communication ability. Use developmentally appropriate tools: a faces scale (such as Wong-Baker) for many children, the FLACC behavioral scale for nonverbal young patients, and a critical-care observation tool when self-report is impossible. Reassess after each intervention, typically within 15-30 minutes for IV opioids.

Before giving more opioid, check airway and ventilation. A patient with shallow respirations, deep sedation, or rising ETCO2 needs respiratory support and an adjusted plan, not automatic dose escalation. A common trap pairs a pain score of 9/10 with a respiratory rate of 8; the safe action treats the respiratory depression first. Conversely, a tolerant chronic-opioid patient may require higher or more frequent dosing plus multimodal adjuncts (acetaminophen, ketorolac, gabapentinoids, regional techniques) and pain-service consultation.

Pain That Signals Trouble

PONV and Aspiration Prevention

Postoperative nausea and vomiting (PONV) is a comfort problem that can also threaten the airway, wounds, hemodynamics, and discharge readiness. First protect the airway: turn the head or position laterally when appropriate, provide suction, withhold oral intake until protective reflexes return, and assess for aspiration signs. Then use ordered antiemetics, which usually target different receptors for additive effect: ondansetron (a serotonin 5-HT3 antagonist), dexamethasone, and a scopolamine patch or low-dose droperidol per orders. Add hydration support, reduced opioid load, slow position changes, and relaxation measures, then reassess.

Persistent vomiting, abdominal distention, blood in emesis, hypotension, severe headache, or new neurologic change is not routine PONV. Connect the symptom to the procedure and anesthesia history.

Temperature and Shivering

Temperature is a physiologic vital sign. Hypothermia, generally a core temperature below 36 C, delays drug metabolism, worsens coagulopathy, increases surgical-site infection risk, and triggers shivering. Shivering can raise oxygen consumption by up to roughly 300-400%, a serious load for patients with coronary disease, anemia, lung disease, or major blood loss. Apply forced-air warming, warm blankets, warmed IV fluids if ordered, and continue temperature checks until normothermia.

Hyperthermia carries different urgency. Fever may reflect warming overshoot, infection, transfusion reaction, thyroid storm, serotonin syndrome, or malignant hyperthermia depending on timing and associated findings. A rapidly rising temperature with rigidity, tachycardia, and rising ETCO2 after trigger exposure is an emergency, not routine fever, and is covered in the emergencies section.

Nonpharmacologic Does Not Mean Optional

Positioning, splinting an incision during coughing, ice, elevation when appropriate, guided breathing, reduced stimulation, and family presence lower distress and drug requirements. Use them deliberately, especially when opioids or sedatives are risky. However, never let comfort measures delay treatment of airway compromise, bleeding, severe neurovascular pain, or an emergency temperature pattern.

Comfort With Safety

Comfort interventions include splinting, repositioning, ice or heat when appropriate, reducing noise and light, protecting privacy, reuniting selected patients with family, treating opioid-related pruritus, and relieving urinary retention. CPAN questions test sequencing. If the patient is unstable, stabilize first. If the patient is stable but uncomfortable, choose the intervention that matches the cause, then reassess the response.

PONV Risk Stratification

The exam expects you to predict and prevent PONV, not just react to it. The validated Apfel score assigns one point each for four factors: female sex, nonsmoking status, a history of PONV or motion sickness, and anticipated postoperative opioid use. Zero, one, two, three, and four risk factors correspond to roughly 10%, 20%, 40%, 60%, and 80% predicted incidence. High-risk patients warrant multimodal prophylaxis started intraoperatively, opioid-sparing analgesia, adequate hydration, and avoidance of sudden movement in recovery.

Recognizing that a young female nonsmoker undergoing laparoscopic surgery is high risk lets the nurse anticipate rather than scramble.

Multimodal and Opioid-Sparing Analgesia

The modern PACU pain plan layers agents that act at different sites so each opioid dose can be smaller and respiratory depression less likely. Scheduled acetaminophen and a nonsteroidal anti-inflammatory drug such as ketorolac (avoided with significant bleeding risk or renal impairment) form a baseline. Regional and neuraxial techniques, local infiltration, gabapentinoids, and low-dose ketamine reduce opioid requirements further. When an opioid is needed, titrate small IV doses and reassess at the drug's peak effect before redosing, watching the respiratory rate and sedation level rather than the pain score alone.

Special Populations

Older adults are more sensitive to opioids and sedatives, clear drugs more slowly, and lose heat faster, making both delayed emergence and hypothermia more likely; start low and reassess often. Patients with obstructive sleep apnea are exquisitely vulnerable to opioid-induced airway collapse and benefit from continuous monitoring, elevated positioning, opioid sparing, and CPAP. Children need weight-based dosing, developmentally appropriate pain tools, and a warm environment because of their high surface-area-to-mass ratio. Matching the comfort plan to the population, rather than applying one routine to everyone, is a recurring exam theme.