1. A 6-year-old patient is undergoing emergence after a tonsillectomy. Upon extubation, the patient exhibits paradoxical chest movements and a high-pitched crowing sound.
Answer: A
The patient is experiencing a partial laryngospasm, which is indicated by the high-pitched crowing and paradoxical chest movements as they try to pull air through narrowed vocal cords. The immediate first step is to apply 100% oxygen with continuous positive pressure to help force the vocal cords open and maintain oxygenation. Preparing succinylcholine is a valid secondary step if the spasm becomes complete and refractory, but it is not the very first action. Reintubation is premature before attempting positive pressure and pharmacological interventions. Inserting an oropharyngeal airway in a lightly anesthetized patient can actually stimulate the airway and worsen the spasm.
2. Patient undergoing laparoscopic cholecystectomy. During initial insufflation, there is a sudden drop in end-tidal CO2, severe hypotension, and a mill-wheel murmur auscultated. The surgeon immediately halts insufflation and desufflates the abdomen.
Answer: A
The cues of sudden drop in ETCO2 and mill-wheel murmur during insufflation strongly indicate a CO2 gas embolism. The correct action is placing the patient in the left lateral Trendelenburg position (Durant's maneuver) to keep the gas bubble in the right ventricular apex, preventing pulmonary outflow obstruction. Option B treats hypovolemia but does not address the mechanical obstruction of an embolism. Option C is incorrect because cardioversion treats arrhythmias, not obstructive shock from gas. Option D worsens the condition by promoting gas travel to the cerebral circulation and exacerbating the outflow tract blockage.
3. A patient with pelvic trauma is undergoing emergency fixation under general anesthesia. The nurse notes tachycardia with a narrowing pulse pressure alongside a large volume of suctioned blood in the canisters. Which intervention should the nurse prioritize?
Answer: C
A trauma patient presenting with a narrowing pulse pressure, tachycardia, and massive blood loss in the suction canisters is exhibiting classic signs of hypovolemic shock. The priority in this scenario is restoring oxygen-carrying capacity and intravascular volume, making the rapid infusion of packed erythrocytes the most appropriate intervention. Epinephrine is indicated for anaphylaxis or cardiac arrest, not hemorrhagic shock, as it would inappropriately increase myocardial oxygen demand. A chest radiograph is useful for diagnosing a pneumothorax, which does not align with the clear evidence of surgical bleeding. The malignant hyperthermia cart is irrelevant to hypovolemia.
4. During a routine audit of the surgical suite, the perioperative nurse is restocking the dedicated MH cart with the traditional dantrolene formulation. Which fluid supply must the nurse ensure is immediately available in the cart?
Answer: B
The correct choice is B because traditional dantrolene must be reconstituted with sterile water that does not contain a bacteriostatic agent. Using a diluent with a preservative increases the risk of severe patient reactions, making option A incorrect. Options C and D are incorrect because normal saline will not properly dissolve the medication, leading to crystal formation and ineffective treatment. Ensuring an adequate volume of preservative-free sterile water is critical since each of the 36 traditional vials requires 60 mL for reconstitution, necessitating at least 2160 mL on hand.
5. During a laparoscopic bowel resection, the anesthesia provider initiates an intravenous lidocaine infusion as part of the ERAS multi-modal analgesia plan. The perioperative nurse should anticipate discontinuing this infusion immediately if the patient exhibits which clinical change?
Answer: B
The correct answer is B because a widening QRS complex indicates potential local anesthetic systemic toxicity, a life-threatening complication of an intravenous lidocaine infusion. The nurse must immediately stop the infusion and notify the anesthesia provider. Option A is incorrect because a sudden temperature increase suggests malignant hyperthermia, which is triggered by volatile anesthetics or succinylcholine, not lidocaine. Option C is incorrect because while lidocaine can cause mild hypotension, a gradual decrease in mean arterial pressure is common during anesthesia and does not mandate immediate cessation unless severe. Option D is incorrect as increased urine output is a normal finding and not a sign of lidocaine toxicity.
6. A laboring patient receives an epidural bolus of ropivacaine and shortly after reports sudden difficulty focusing her vision and severe dizziness. Which assessment finding would most strongly corroborate a suspected systemic toxicity event?
Answer: C
Visual disturbances, such as difficulty focusing, and severe dizziness are classic early neurological signs of LAST. The onset of generalized facial and perioral twitching strongly corroborates this suspicion, as it represents escalating CNS excitation that often immediately precedes generalized seizures. Option A is incorrect because sudden and severe muscular rigidity is a hallmark sign of malignant hyperthermia, which is triggered by volatile anesthetics or succinylcholine, not local anesthetics. Option B is incorrect because a widespread macular skin rash indicates an immune-mediated allergic or anaphylactic response, which is a completely different pathophysiological process than systemic toxicity. Option D is incorrect because while intense pain at the injection site might indicate nerve injury, improper needle placement, or localized tissue irritation, it does not confirm the presence of a systemic toxic event.
7. Immediately following femoral canal pressurization with bone cement, the anesthesia provider reports a sudden drop in blood pressure and a decreased end-tidal carbon dioxide level. What is the most appropriate action for the perioperative nurse?
Answer: A
The clinical signs of hypotension and decreased end-tidal CO2 during cement pressurization strongly indicate bone cement implantation syndrome (BCIS). The nurse must ensure the team is aware so they can provide immediate supportive care to manage the hemodynamic collapse. Option B is incorrect because the mixing system vacuum controls ambient vapors, not the systemic physiological reaction occurring inside the patient. Option C is incorrect; there is no specific chemical reversal agent for methyl methacrylate monomer toxicity in the bloodstream. Option D is incorrect because removing the cement is not the primary treatment for BCIS; the focus must be on aggressive resuscitation, oxygenation, and volume expansion.
8. After the malignant hyperthermia crisis has stabilized, the patient is preparing for postoperative transfer to the intensive care unit. The nurse anticipates an order to:
Answer: C
Once an acute malignant hyperthermia episode is controlled, the patient remains at high risk for recrudescence. The standard maintenance dose is 1.0 mg/kg administered intravenously every four to six hours for at least 24 hours, making Option C correct. Option A is incorrect because 2.5 mg/kg is the initial crisis bolus, not the maintenance dose. Options B and D are incorrect because extending the dosing interval to eight to twelve hours leaves the patient vulnerable to a rebound hypermetabolic state during the critical early post-crisis recovery period.
9. During a prolonged laparoscopic Nissen fundoplication, the anesthesia provider reports an unexplained increase in end-tidal CO2, and the nurse notes crepitus across the patient's chest wall.
Answer: D
The correct action is to notify the surgeon immediately and prepare to lower the insufflation pressure. The presence of crepitus across the chest wall combined with an unexplained increase in end-tidal CO2 indicates subcutaneous emphysema, a complication where CO2 gas tracks into the subcutaneous tissues. Lowering the insufflation pressure helps minimize further gas tracking while the anesthesia provider manages the hypercarbia. Verifying needle placement and increasing flow (Option A) would actively worsen the condition by forcing more gas into the wrong tissue planes. Administering a fluid bolus (Option B) does not address the mechanical issue of misplaced gas or the resulting respiratory acidosis. Disconnecting the tubing and initiating open conversion (Option C) is a drastic overreaction; hypercarbia from subcutaneous emphysema can often be managed conservatively by adjusting ventilation and lowering abdominal pressure.
10. A 100-kg patient experiences a malignant hyperthermia crisis. The facility stocks traditional 20-mg dantrolene vials. Which action reflects the correct initial preparation for this patient?
Answer: A
The initial dose of dantrolene is 2.5 mg/kg. For a 100-kg patient, this requires 250 mg. Using traditional 20-mg vials, the nurse must prepare 13 vials (12.5 rounded up) to deliver the full dose. Traditional dantrolene must be reconstituted with 60 mL of preservative-free sterile water to prevent precipitation. Option A correctly identifies the dose and diluent. Options B and D are incorrect because bacteriostatic water contains benzyl alcohol, which is toxic in the large volumes required for this medication. Options C and D calculate the dose incorrectly, providing only 200 mg, which falls short of the required initial weight-based bolus.
11. A patient with a known family history of malignant hyperthermia requires an urgent surgical procedure. As the perioperative nurse reviews the planned medications for induction and maintenance of anesthesia, which combination of agents should be confirmed as safe for this specific patient?
Answer: A
Malignant hyperthermia is triggered by volatile inhalation anesthetics and the depolarizing muscle relaxant succinylcholine. When caring for a patient with a known family history, the perioperative nurse must ensure a trigger-free anesthetic plan is utilized. Propofol, rocuronium, and fentanyl are all safe, non-triggering agents. Etomidate is safe, but succinylcholine and sevoflurane are potent triggers. Ketamine and vecuronium are safe, but desflurane is a volatile gas that will trigger a crisis. Midazolam and pancuronium are safe, but isoflurane is a known trigger. By understanding which pharmacological agents initiate the hypermetabolic response, the nurse can effectively advocate for patient safety and prevent a life-threatening event before induction begins.
12. A pediatric patient exhibits a high-pitched crowing sound and paradoxical chest movement immediately following extubation. The oxygen saturation is rapidly declining despite the application of supplemental oxygen. Which action should the perioperative nurse anticipate next?
Answer: A
The patient is experiencing laryngospasm, a common complication in pediatric populations during emergence. The first-line intervention is to apply continuous positive airway pressure using a tight-fitting mask along with a forceful jaw thrust, often referred to as Larson's maneuver, to physically break the spasm. Administering succinylcholine is reserved for refractory cases when non-pharmacological measures fail. Preparing a bronchoscope delays critical ventilation and is not indicated for this acute upper airway spasm. Dexamethasone reduces airway edema over hours but will not resolve an acute, life-threatening spasm.
13. An 82-year-old patient under general anesthesia receives a massive transversus abdominis plane block with bupivacaine. The nurse observes a sudden drop in blood pressure and a widened QRS complex. What is the most accurate interpretation of these specific clinical findings?
Answer: C
When a patient is under general anesthesia, the classic early signs of CNS excitation are completely masked by the anesthetic agents. Bupivacaine is uniquely known for its profound cardiotoxicity, which can manifest suddenly as severe hypotension, bradycardia, and a widened QRS complex on the electrocardiogram. Option A is incorrect because while anaphylaxis can cause profound hypotension, it typically presents with bronchospasm, tachycardia, or cutaneous signs rather than an isolated widened QRS complex. Option B is incorrect because the clinical findings described are purely cardiovascular in nature, not masked neurological signs. Option D is incorrect because malignant hyperthermia classically presents with an unexplained rise in end-tidal carbon dioxide, tachycardia, and muscle rigidity, not isolated bradycardia and widened QRS complexes following a regional block.
14. A surgical patient is transferred to the ICU following a successfully treated malignant hyperthermia crisis. The perioperative nurse emphasizes which early indicator of recrudescence during the standardized handoff communication?
Answer: A
Recrudescence of malignant hyperthermia occurs in approximately one-quarter of patients, usually within the first 24 hours after the initial crisis is resolved. The most sensitive and earliest sign of recrudescence is a sudden rise in end-tidal carbon dioxide, reflecting a dangerous return of uncontrolled hypermetabolism. Option A correctly identifies this critical early warning sign that ICU nurses must monitor. Option B is incorrect because MH causes profound hyperthermia, not hypothermia, and temperature changes are often late signs of an impending crisis. Option C is incorrect because a decrease in oxygen saturation is a late respiratory complication, not the primary early indicator of a returning hypermetabolic state. Option D is incorrect because urine output typically decreases or becomes dark brown due to myoglobinuria, rather than increasing. Clear communication of ETCO2 trends during handoff is essential.
15. During induction for a trauma laparotomy, a 30-year-old patient receives succinylcholine. The anesthesia provider reports difficulty opening the patient's mouth for intubation despite adequate dosing. The perioperative nurse should anticipate which immediate clinical change?
Answer: C
C is correct because masseter muscle rigidity after succinylcholine is a strong predictor of malignant hyperthermia, which immediately presents with an abrupt rise in ETCO2 due to massive hypermetabolic cellular activity. A is incorrect because oxygen saturation drops later as systemic oxygen consumption outpaces supply. B is incorrect because core temperature eventually increases, not decreases, during this crisis. D is incorrect because cyanosis is a late clinical sign resulting from prolonged oxygen depletion and tissue hypoxia.
