Perioperative nursing: complete reference guide for nursing students

Perioperative nursing covers the full continuum of care for surgical patients across three distinct phases: preoperative (before surgery), intraoperative (during surgery), and postoperative (after surgery). Each phase has its own nursing priorities, assessment requirements, and safety protocols — and understanding all three is essential for any nursing student rotating through surgical settings. This reference covers the core responsibilities, clinical assessments, safety protocols, common complications, and medication considerations that define perioperative nursing practice.

The three phases of perioperative care at a glance

Preoperative phase: nursing assessment and preparation

The preoperative phase begins when surgery is decided upon and ends when the patient is transferred to the operating room. The nurse’s primary responsibilities are comprehensive assessment, patient education, safety verification, and preparation for safe anesthesia induction.

Preoperative nursing assessment

A thorough preoperative assessment identifies risks before the patient ever enters the OR. Key components include:

• Health history: Current diagnoses, previous surgeries, prior anesthesia reactions, family history of malignant hyperthermia, tobacco and alcohol use (both affect anesthetic requirements and healing)
• Medication reconciliation: Document all prescription medications, over-the-counter drugs, herbal supplements, and anticoagulants. Many medications require holding or bridging protocols before surgery (see the medication considerations section below).
• Allergy review: Latex allergy requires OR team notification and latex-free equipment setup. Document anesthetic medication allergies separately.
• NPO (nothing by mouth) status: Standard NPO guidelines per the American Society of Anesthesiologists (ASA) are 8 hours for solid food, 6 hours for non-human milk or a light meal, 4 hours for breast milk, and 2 hours for clear liquids. Verify the patient has adhered to the correct timeframe.
• Vital signs baseline: Document a complete baseline set of vital signs for intraoperative and postoperative comparison.
• Lab and diagnostic review: Confirm that ordered labs (CBC, BMP, coagulation studies, type and screen) and imaging have been completed and reviewed by the surgical team.

Consent verification

Informed consent is the legal and ethical documentation that the patient understands the proposed procedure, its risks, benefits, and alternatives. The nurse’s role is to verify that consent is present and signed — not to explain the procedure or answer clinical questions about it, which is the provider’s responsibility. Consent must be obtained before any sedating premedications are given. Three conditions make consent valid:

1. Adequate disclosure of diagnosis, procedure, risks, and expected outcomes
2. Patient comprehension without impairment
3. Voluntary agreement without coercion

If a patient expresses doubt or asks clinical questions after signing, stop and notify the surgeon before proceeding.

Surgical site marking and the pre-procedure time-out

The WHO Surgical Safety Checklist guides three critical safety moments:

• Sign in (before anesthesia): Confirm patient identity with two identifiers, verify consent, confirm site marked (if applicable), review allergy and airway status.
• Time out (before incision): Full team pause — confirm correct patient, correct site, correct procedure. Every team member must verbally agree. The nurse is often the person who calls and facilitates the time-out.
• Sign out (before patient leaves OR): Instrument/sponge/needle count confirmed, specimens labeled, any equipment concerns addressed.

Preoperative patient education

Patients who understand what to expect recover faster and report less anxiety. Nursing education before surgery should cover:

• What will happen on the day of surgery (transport, IV placement, anesthesia induction)
• Expected pain levels and available pain management options
• Deep breathing exercises and incentive spirometry (reduces postoperative atelectasis)
• Leg exercises and early ambulation importance (VTE prevention)
• Wound care expectations and signs of infection to watch for after discharge

Intraoperative phase: roles, safety, and monitoring

The intraoperative phase spans from the patient’s entry into the OR suite until transfer to the PACU. Two distinct nursing roles operate in the OR simultaneously.

Scrub nurse vs. circulating nurse

The circulating nurse must be a registered nurse. The scrub role may be filled by an RN or a surgical technologist, depending on facility policy.

Surgical count protocol

Counts of sponges, sharps, and instruments occur at three points:

1. Before the procedure begins (baseline count)
2. Before closure of a body cavity
3. At skin closure

If counts do not reconcile, the surgeon must be notified immediately and the patient must not be closed until the discrepancy is resolved — regardless of time pressure.

Intraoperative patient positioning

Surgical positioning affects respiratory function, nerve integrity, and tissue perfusion. Pressure injuries and nerve damage are real intraoperative risks, particularly in long procedures. Common positions and their nursing considerations:

• Supine: Most common. Protect heels, occiput, and sacrum with padding. Monitor for compression of the ulnar and brachial plexus if arms are extended.
• Prone: Used for spine and posterior procedures. Protect eyes, ears, genitalia, and chest prominences. Ensure ETT is not dislodged on repositioning.
• Lithotomy: Used for pelvic and perineal procedures. Reposition both legs simultaneously to prevent hip injury. Watch for compartment syndrome on long cases.
• Lateral: Used for thoracic and hip procedures. Axillary roll placed under the dependent chest wall (not the axilla) to prevent brachial plexus compression.

See the dedicated patient positioning guide for full positioning details and pressure injury prevention.

Thermoregulation

Hypothermia is a common and underrecognized intraoperative complication. The OR environment, open body cavities, cold IV fluids, and anesthetic agents all suppress the normal thermoregulatory response. Unintended hypothermia (core temperature < 36°C / 96.8°F) increases surgical site infection risk, coagulopathy, and cardiac events.

Nursing interventions:

• Warm IV fluids and irrigation solutions
• Forced-air warming blankets before induction and throughout the procedure
• Limit skin exposure; cover body areas not in the surgical field
• Monitor core temperature continuously during long or open procedures

Post-anesthesia care unit (PACU): recovery phase nursing

The postoperative phase begins at PACU admission and ends when the patient meets discharge criteria. PACU care is some of the most intensive, time-pressured nursing you will encounter — the first 30–60 minutes after anesthesia carry the highest risk for respiratory, hemodynamic, and neurologic complications.

PACU nursing priorities on admission

When a patient arrives in the PACU, the anesthesia provider gives a verbal handoff. The nurse should simultaneously:

1. Attach monitoring (pulse oximetry, continuous ECG, NIBP every 5 minutes initially)
2. Assess airway patency and respiratory rate — airway compromise is the leading cause of PACU mortality
3. Obtain initial vital signs and compare to the intraoperative baseline
4. Assess level of consciousness (LOC) and orientation
5. Inspect the surgical site dressing for bleeding
6. Assess pain level using a validated scale (numeric, FACES, or behavioral depending on patient)
7. Review operative and anesthesia notes for procedure, fluid balance, estimated blood loss, and any intraoperative events

Vital signs are typically taken every 5 minutes for the first 15 minutes, then every 15 minutes until discharge criteria are met.

Modified Aldrete score: PACU discharge criteria

The Modified Aldrete Score is the standard tool for determining PACU discharge readiness. Each of five parameters is scored 0–2. A score of 8 or higher indicates the patient is ready for discharge from Phase I recovery (PACU to floor or Phase II recovery).

Maximum score: 10. Discharge threshold: ≥ 8.

The score does not assess home-readiness for ambulatory patients. Extended criteria (PADSS — Post-Anesthetic Discharge Scoring System) address pain, nausea, ambulation, oral fluid tolerance, and voiding for patients going directly home.

Airway management in the PACU

Respiratory depression is the most life-threatening PACU complication. Causes include:

• Residual opioid effect → give naloxone 0.04–0.4 mg IV, titrated; have it ready at bedside
• Residual benzodiazepine sedation → flumazenil 0.2 mg IV; repeat every 60 seconds to a max of 1 mg
• Laryngospasm → jaw thrust, positive pressure oxygen; notify anesthesia immediately
• Bronchospasm → bronchodilators, supplemental O₂, notify anesthesia

Maintain the patient in a position that protects the airway (recovery position for unconscious patients, head of bed elevated 30–45° once the patient is arousable) and keep suction immediately available.

Common perioperative complications

Malignant hyperthermia: what every nurse must know

Malignant hyperthermia (MH) is a rare but life-threatening pharmacogenetic disorder triggered by volatile halogenated anesthetics (halothane, sevoflurane, desflurane, isoflurane) and succinylcholine. It causes uncontrolled skeletal muscle calcium release, leading to hypermetabolism and rapid heat generation.

Risk factors: autosomal dominant mutations in the RYR1 (ryanodine receptor 1) gene; family history is the key screening question. A previous uneventful anesthetic does not rule out susceptibility.

Treatment is a true emergency:

1. Call for help immediately; activate MH protocol
2. Discontinue triggering agents; switch to safe anesthesia (TIVA — total IV anesthesia)
3. Dantrolene sodium IV — the only definitive treatment. Inhibits calcium release from the sarcoplasmic reticulum.
4. Hyperventilate with 100% O₂ at high flow to clear CO₂
5. Active cooling: cold IV saline, ice packs to axilla/groin, cold lavage if needed
6. Treat complications: bicarbonate for acidosis, manage dysrhythmias, monitor urine output for myoglobinuria

Perioperative medication considerations

Medication management around surgery is a source of preventable harm. The nurse plays a critical role in medication reconciliation and ensuring bridging or holding instructions are followed.

Related pages and resources

Perioperative nursing draws on knowledge from across clinical practice. These pages provide deeper coverage of key related topics:

• Head-to-toe assessment — the structured physical assessment framework that underpins both the preoperative and postoperative nursing evaluation
• Vital signs by age — normal vital sign ranges for comparison with perioperative baselines
• Patient positioning — full guide to surgical and clinical positions with pressure injury and nerve injury prevention
• DVT nursing reference — deep vein thrombosis prevention, assessment, and management relevant to every surgical patient
• Wound assessment guide — systematic approach to assessing surgical sites postoperatively
• SBAR communication — the structured communication format for escalating postoperative concerns to the surgical team
• Sepsis nursing reference — recognizing and responding to sepsis, a key surgical site infection complication
• Medication rights in nursing — the rights framework for safe perioperative medication administration

Clinical sources

• Perioperative nursing care. In: Health Alterations. NCBI Bookshelf, NBK613066. National Library of Medicine.
• Aldrete JA. The post-anesthesia recovery score revisited. J Clin Anesth. 1995;7(1):89–91. NCBI: NBK594237.
• Malignant hyperthermia treatment. Medscape/StatPearls. NCBI: NBK430828.
• WHO Surgical Safety Checklist. World Health Organization, 2009.
• American Society of Anesthesiologists. Practice Guidelines for Preoperative Fasting. Anesthesiology. 2017;126(3):376–393.