6.5 Intraoperative Medication, Solution & Fluid Safety
Key Takeaways
- Every medication or solution on and off the sterile field is labeled immediately when transferred from its original container, even when only one product is present.
- Medication verification includes the order, patient, drug or solution, concentration, dose, route, expiration, allergies, contraindications, and verbal read-back between the circulator and scrub person.
- Local-anesthetic totals must combine all sources and account for weight, agent, concentration, epinephrine, comorbidity, and prescriber limits; the team stops administration and activates the LAST response when toxicity is suspected.
- Irrigants, contrast, heparinized solutions, and specimen preservatives are kept in distinct labeled containers and documented with relevant amounts and patient response.
Intraoperative Medication, Solution & Fluid Safety
Core principle: Once a drug or solution leaves its manufacturer-labeled container, identity can no longer be inferred from color, location, syringe size, or memory. Immediate labeling and closed-loop verification prevent wrong-drug, wrong-concentration, and wrong-route injuries.
Order-to-Field Verification
Before a medication reaches the sterile field, the circulating nurse verifies a valid order or approved protocol, patient identifiers, allergies, drug name, concentration, intended dose and route, expiration date, and relevant contraindications. The circulator and scrub person read the label aloud together as the product is transferred. The receiving person repeats the name and strength. If the surgeon later requests a medication verbally, the nurse performs read-back and resolves ambiguous abbreviations, sound-alike names, or dose units before preparation.
Do not prelabel an empty cup or syringe. Label the container immediately after filling it, and never leave an unlabeled container unattended while searching for a label. The label should identify the medication or solution and strength or concentration; add amount, diluent, preparation time, expiration or beyond-use time, and preparer initials when required by policy. Label basins and medicine cups as well as syringes. A product prepared off the field remains labeled during transport to the field. At relief handoff and before use, the incoming nurse verifies every medication and solution still present.
High-Risk Look-Alike Situations
Clear liquids are not interchangeable. Local anesthetic, sterile water, saline, alcohol, hydrogen peroxide, contrast, heparinized saline, and specimen preservative may look identical. Keep formalin and other preservatives away from the sterile medication area; formalin is not introduced to the sterile field. Use separate, clearly marked containers and remove discontinued products. A medication should remain in its original vial or ampule long enough for both team members to verify it, and the container is retained according to policy until the case is completed.
For compounded or diluted drugs, state the final concentration in usable units. For example, adding 1 mg of epinephrine to 1,000 mL produces 1 microgram/mL; the calculation, final volume, and label must be independently checked when required. Never assume that “one percent” or “one-to-one-thousand” communicates an unambiguous dose without units. Decimal safeguards matter: use a leading zero for amounts below one and never use a trailing zero.
Local Anesthetic Cumulative Dose
The nurse tracks the total milligrams from every source, including a regional block placed before the patient enters the OR, surgeon infiltration, topical application, and infusion. Convert percentage to milligrams per milliliter before multiplying by volume: 0.25% equals 2.5 mg/mL, 0.5% equals 5 mg/mL, and 1% equals 10 mg/mL. Maximum-dose references are not permission to administer automatically; use the ordered agent-specific limit and reduce it when age, frailty, hepatic or cardiac disease, pregnancy, low muscle mass, or interacting drugs increase toxicity risk.
Communicate the cumulative amount before each additional dose. Stop injection if the patient reports tinnitus, metallic taste, circumoral numbness, agitation, or dizziness, or if seizure, conduction delay, hypotension, or ventricular dysrhythmia appears. Call for help, support oxygenation and ventilation, bring the LAST checklist and 20% lipid emulsion, and follow the emergency protocol. The medication record must show agent, concentration, dose, route or site, time, administering practitioner, and response.
Irrigation, Anticoagulants, Contrast & Fluids
The surgeon and nurse confirm whether an irrigant is approved for the body cavity and device. Sterile water may cause hemolysis if absorbed intravascularly in sufficient quantity; hypotonic absorption during endoscopic procedures can also cause electrolyte and neurologic injury. Track irrigation infused and recovered when fluid absorption is clinically relevant, recognize an unexplained deficit, and notify anesthesia and the surgeon before it becomes severe.
Heparinized solutions require a clear order and labeled concentration. Coordinate systemic anticoagulant administration with the surgeon and anesthesia professional, document the time and dose, and perform ordered point-of-care testing. Iodinated contrast requires allergy history, renal-risk review when relevant, correct route, and documentation of type and volume. Products intended for topical use are never injected unless the manufacturer labeling and order support that route.
Counts, Waste & Handoff
At case completion, reconcile controlled substances and medication waste with the required witness and electronic record. Include medications given, remaining doses, antibiotics and redosing time, local-anesthetic total, blood loss, urine output, irrigation balance, and any adverse response in the handoff. When identity, sterility, concentration, or integrity is uncertain, discard the product safely and prepare a new verified dose rather than guessing.
The scrub person pours 0.5% bupivacaine into a sterile medicine cup and is immediately asked to assist with draping. What should occur next?
A patient received 75 mg of bupivacaine in a preoperative block. The surgeon requests another 20 mL of 0.5% bupivacaine for infiltration. What is the nurse’s first medication-safety action?
During endoscopic irrigation, the recorded infused volume greatly exceeds recovered volume and the patient becomes confused and hypertensive. What is the priority response?