A 55-year-old man with chronic pain on high-dose opioids (120 mg oral morphine equivalents daily) requires major spine surgery. Intraoperatively, he requires escalating doses of fentanyl with poor pain control. Postoperatively, his pain remains severe (10/10) despite maximum conventional multimodal analgesia including IV hydromorphone PCA, acetaminophen, and ketorolac. He becomes increasingly agitated and tachycardic. Evaluate the most comprehensive pain management strategy addressing the underlying pathophysiology.
Q2
A 70-year-old man with severe aortic stenosis (valve area 0.6 cm², mean gradient 55 mmHg) develops acute cholecystitis requiring surgery. He is symptomatic with exertional angina and dyspnea. Cardiology recommends TAVR before surgery, but the patient has signs of gallbladder perforation. The surgical team debates timing of interventions. Evaluate the optimal management strategy weighing cardiac and surgical risks.
Q3
A 42-year-old woman with a history of multiple anesthetic complications presents for elective surgery. Previous records indicate awareness during general anesthesia twice, prolonged paralysis after succinylcholine requiring 6 hours of ventilation, and a sibling with fatal anesthetic complication involving hyperthermia and rhabdomyolysis. Evaluate the comprehensive anesthetic plan that addresses all potential complications.
Q4
A 65-year-old man develops postoperative delirium on day 2 after open AAA repair. He is agitated, pulling at his lines, and has waxing-waning confusion. His vital signs are stable, and laboratory values including sodium, glucose, and calcium are normal. He received 4 mg of morphine IV 2 hours ago for pain. Analyze the most appropriate pharmacologic intervention.
Q5
A 28-year-old pregnant woman at 32 weeks gestation requires emergency appendectomy for perforated appendicitis. Fetal heart tones are reassuring. The obstetrician recommends fetal monitoring during surgery. Analyze the optimal anesthetic approach considering both maternal and fetal safety.
Q6
A 38-year-old woman with myasthenia gravis controlled on pyridostigmine presents for thymectomy. During anesthesia, the anesthesiologist notes prolonged neuromuscular blockade after standard-dose rocuronium. Her train-of-four ratio is 0.15 thirty minutes after the last dose. Neostigmine administration provides minimal improvement. Analyze the most likely cause and appropriate management.
Q7
A 55-year-old woman undergoes total thyroidectomy under general anesthesia. In the recovery room, she develops stridor, difficulty breathing, and her oxygen saturation drops to 88%. Her neck appears swollen and tense. Vital signs: BP 145/90 mmHg, HR 115/min. What is the most appropriate immediate management?
Q8
A 72-year-old man with severe COPD (FEV1 40% predicted) requires emergency laparotomy for perforated diverticulitis. He is hemodynamically stable after resuscitation. The anesthesiologist is concerned about postoperative ventilator dependence. What perioperative strategy best reduces his risk of prolonged mechanical ventilation?
Q9
A 45-year-old woman develops malignant hyperthermia during general anesthesia for cholecystectomy. She presents with rapidly rising temperature (40.5°C), muscle rigidity, tachycardia (140/min), and hypercarbia (ETCO2 78 mmHg). What is the immediate first-line treatment?
Q10
A 68-year-old man with coronary artery disease is scheduled for elective inguinal hernia repair under general anesthesia. His medications include aspirin, metoprolol, and atorvastatin. He had a drug-eluting stent placed 8 weeks ago. His cardiologist recommends continuing aspirin perioperatively. What is the most appropriate perioperative management of his antiplatelet therapy?
Anesthesia and Perioperative medicine US Medical PG Practice Questions and MCQs
Question 1: A 55-year-old man with chronic pain on high-dose opioids (120 mg oral morphine equivalents daily) requires major spine surgery. Intraoperatively, he requires escalating doses of fentanyl with poor pain control. Postoperatively, his pain remains severe (10/10) despite maximum conventional multimodal analgesia including IV hydromorphone PCA, acetaminophen, and ketorolac. He becomes increasingly agitated and tachycardic. Evaluate the most comprehensive pain management strategy addressing the underlying pathophysiology.
A. Increase PCA opioid dose to match home requirements plus surgical pain needs
B. Transition to methadone for better mu-receptor coverage
C. Ketamine infusion to address opioid-induced hyperalgesia and NMDA receptor sensitization (Correct Answer)
D. Epidural analgesia with local anesthetic and low-dose opioid
E. Regional nerve blocks with liposomal bupivacaine
Explanation: ***Ketamine infusion to address opioid-induced hyperalgesia and NMDA receptor sensitization***
- The patient exhibits **opioid-induced hyperalgesia (OIH)**, where high-dose opioids paradoxically increase pain sensitivity through **NMDA receptor** activation and central sensitization.
- **Ketamine** is an NMDA receptor antagonist that directly targets the underlying pathophysiology to reverse **central sensitization** and reduce the "wind-up" phenomenon.
*Increase PCA opioid dose to match home requirements plus surgical pain needs*
- Simply increasing the opioid dose in a patient with **OIH** can exacerbate the pain sensitization rather than alleviate it.
- This strategy fails to address the down-regulation of **mu-receptors** and the neuroplastic changes associated with chronic high-dose opioid use.
*Transition to methadone for better mu-receptor coverage*
- While **methadone** has NMDA antagonist properties, a rapid transition in the acute postoperative setting is pharmacokinetically complex and lacks the immediate efficacy of a **low-dose ketamine infusion**.
- Methadone titration is challenging due to its long **half-life** and risk of delayed respiratory depression in an agitated, acutely painful patient.
*Epidural analgesia with local anesthetic and low-dose opioid*
- While neuraxial techniques are normally effective, **major spine surgery** often complicates or precludes the placement of an epidural due to surgical site constraints or dural integrity.
- This approach may provide regional relief but does not systemically address the **centralized hyperalgesia** caused by chronic high-dose opioid therapy.
*Regional nerve blocks with liposomal bupivacaine*
- **Regional blocks** for extensive spine surgery may provide inadequate coverage for the broad dermatomal distribution involved in major spinal procedures.
- These blocks target **peripheral nerves** and do not address the **NMDA-mediated sensitization** in the central nervous system that is driving this patient's severe pain.
Question 2: A 70-year-old man with severe aortic stenosis (valve area 0.6 cm², mean gradient 55 mmHg) develops acute cholecystitis requiring surgery. He is symptomatic with exertional angina and dyspnea. Cardiology recommends TAVR before surgery, but the patient has signs of gallbladder perforation. The surgical team debates timing of interventions. Evaluate the optimal management strategy weighing cardiac and surgical risks.
A. Emergency cholecystectomy under general anesthesia with careful hemodynamic monitoring
B. Medical management of cholecystitis with antibiotics, TAVR in 6 weeks, then cholecystectomy
C. Percutaneous cholecystostomy tube followed by TAVR, then delayed cholecystectomy (Correct Answer)
D. Combined TAVR and cholecystectomy in one procedure
E. Open cholecystectomy under epidural anesthesia to avoid general anesthesia risks
Explanation: ***Percutaneous cholecystostomy tube followed by TAVR, then delayed cholecystectomy***
- Severe, symptomatic **aortic stenosis (AS)** represents an extremely high perioperative risk for major non-cardiac surgery; a **percutaneous cholecystostomy** provides rapid source control for the gallbladder under local anesthesia without the hemodynamic stress of general anesthesia.
- This staged approach stabilizes the surgical emergency first, allowing for **Transcatheter Aortic Valve Replacement (TAVR)** to be performed under safer conditions before the patient undergoes a definitive cholecystectomy.
*Emergency cholecystectomy under general anesthesia with careful hemodynamic monitoring*
- The perioperative mortality risk for patients with **symptomatic severe AS** undergoing non-cardiac surgery is unacceptably high due to the inability to increase **cardiac output** in response to surgical stress.
- Induction of general anesthesia and **positive pressure ventilation** can lead to sudden, fatal drops in systemic vascular resistance and preload that the stenotic valve cannot accommodate.
*Medical management of cholecystitis with antibiotics, TAVR in 6 weeks, then cholecystectomy*
- Signs of **gallbladder perforation** constitute a surgical emergency that cannot be managed with antibiotics alone as it will likely lead to **septic shock**.
- Delaying definitive treatment for the gallbladder for 6 weeks in the presence of a perforation would likely result in patient death before cardiac optimization could occur.
*Combined TAVR and cholecystectomy in one procedure*
- Performing a **combined procedure** unnecessarily prolongs anesthesia time and increases the risk of complications such as **bleeding** from the anticoagulation required for TAVR.
- The inflammatory state from the acute cholecystitis and potential sepsis would significantly increase the risk of **TAVR complications**, including valve thrombosis or migration.
*Open cholecystectomy under epidural anesthesia to avoid general anesthesia risks*
- **Neuraxial anesthesia** (spinal or epidural) is generally **contraindicated** in severe aortic stenosis because it can cause rapid sympatholysis and severe **hypotension**.
- An open surgical approach is more invasive and causes more physiological stress than a percutaneous drain, which is the safer initial strategy for an unstable cardiac patient.
Question 3: A 42-year-old woman with a history of multiple anesthetic complications presents for elective surgery. Previous records indicate awareness during general anesthesia twice, prolonged paralysis after succinylcholine requiring 6 hours of ventilation, and a sibling with fatal anesthetic complication involving hyperthermia and rhabdomyolysis. Evaluate the comprehensive anesthetic plan that addresses all potential complications.
A. Genetic testing before proceeding with any anesthetic
B. Total intravenous anesthesia with propofol and remifentanil, avoid succinylcholine and volatile agents, use rocuronium with sugammadex reversal (Correct Answer)
C. Standard general anesthesia with dantrolene prophylaxis
D. Volatile anesthetic with BIS monitoring, avoid all muscle relaxants
E. Regional anesthesia only without any general anesthetic agents
Explanation: ***Total intravenous anesthesia with propofol and remifentanil, avoid succinylcholine and volatile agents, use rocuronium with sugammadex reversal***
- **Total intravenous anesthesia (TIVA)** using propofol and remifentanil avoids **volatile anesthetics** and **succinylcholine**, which are mandatory triggers for **malignant hyperthermia (MH)** mentioned in the family history.
- Avoiding **succinylcholine** prevents prolonged paralysis due to suspected **pseudocholinesterase deficiency**, while **rocuronium** with **sugammadex** provides safe neuromuscular blockade and reliable reversal.
*Genetic testing before proceeding with any anesthetic*
- While **genetic testing** for **RYR1** or **BCHE** mutations is helpful, it is not a comprehensive "anesthetic plan" and would delay necessary elective surgery.
- Negative genetic results do not fully rule out **malignant hyperthermia** susceptibility; clinical precautions must be taken regardless.
*Standard general anesthesia with dantrolene prophylaxis*
- **Dantrolene prophylaxis** is no longer recommended; the standard of care is the strict avoidance of triggering agents like **isoflurane** or **sevoflurane**.
- Using standard anesthesia would involve **volatile agents**, which are contraindicated due to the high risk of **malignant hyperthermia** suggested by the sibling's death.
*Volatile anesthetic with BIS monitoring, avoid all muscle relaxants*
- **Volatile anesthetics** are absolute contraindications in patients at risk for **malignant hyperthermia**, regardless of monitoring techniques used.
- Avoiding all muscle relaxants may lead to poor surgical conditions, whereas **non-depolarizing agents** like **rocuronium** are safe in these patients.
*Regional anesthesia only without any general anesthetic agents*
- While **regional anesthesia** is a safe alternative, it may be insufficient depending on the surgical site or complexity of the procedure.
- A history of **anesthesia awareness** indicates a need for a controlled general anesthetic plan if surgery is not amenable to a simple block.
Question 4: A 65-year-old man develops postoperative delirium on day 2 after open AAA repair. He is agitated, pulling at his lines, and has waxing-waning confusion. His vital signs are stable, and laboratory values including sodium, glucose, and calcium are normal. He received 4 mg of morphine IV 2 hours ago for pain. Analyze the most appropriate pharmacologic intervention.
A. Propofol infusion for sedation
B. Haloperidol 0.5-1 mg IV or IM (Correct Answer)
C. Increase morphine dose for better pain control
D. Lorazepam 2 mg IV for sedation
E. Diphenhydramine 25 mg IV for sleep
Explanation: ***Haloperidol 0.5-1 mg IV or IM***
- Low-dose **haloperidol** is the first-line pharmacologic agent for managing severe **postoperative delirium** when non-pharmacological measures fail or the patient is a danger to themselves.
- It has a safe profile in the elderly for brief use and does not cause significant **respiratory depression** unlike sedatives.
*Propofol infusion for sedation*
- **Propofol** is reserved for patients who are **intubated** in an ICU setting and is not appropriate for a patient on the general surgical floor.
- It can cause profound **hypotension** and requires continuous hemodynamic monitoring which is not indicated for this stable patient.
*Increase morphine dose for better pain control*
- **Opioids** are common triggers for delirium; increasing the dose of morphine would likely **worsen the confusion** rather than resolve it.
- While pain must be managed, alternative strategies like **regional anesthesia** or non-opioid medications should be prioritized in a delirious patient.
*Lorazepam 2 mg IV for sedation*
- **Benzodiazepines** are generally contraindicated in delirium because they often cause **paradoxical agitation** and worsen cognitive impairment.
- They should only be used as a first-line agent when delirium is caused by **alcohol withdrawal** or benzodiazepine withdrawal.
*Diphenhydramine 25 mg IV for sleep*
- **Diphenhydramine** has significant **anticholinergic** properties, which are strongly associated with the development and prolongation of **delirium**.
- Using this for sleep in an elderly postoperative patient increases the risk of **falls and further disorientation**.
Question 5: A 28-year-old pregnant woman at 32 weeks gestation requires emergency appendectomy for perforated appendicitis. Fetal heart tones are reassuring. The obstetrician recommends fetal monitoring during surgery. Analyze the optimal anesthetic approach considering both maternal and fetal safety.
A. Delay surgery until after delivery by cesarean section
B. Spinal anesthesia to avoid fetal exposure to volatile anesthetics
C. Local anesthesia with conscious sedation to minimize fetal drug exposure
D. General anesthesia with rapid sequence intubation and left uterine displacement (Correct Answer)
E. Epidural anesthesia with incremental dosing to T4 level
Explanation: ***General anesthesia with rapid sequence intubation and left uterine displacement***
- **Rapid sequence induction (RSI)** with cricoid pressure is essential because pregnant patients are considered to have a **full stomach** and are at high risk for **aspiration pneumonitis**.
- **Left uterine displacement** is critical after 20 weeks gestation to avoid **aortocaval compression**, which can cause maternal hypotension and reduced **uteroplacental perfusion**.
*Delay surgery until after delivery by cesarean section*
- **Perforated appendicitis** is a surgical emergency; delaying treatment significantly increases the risk of **maternal sepsis** and fetal demise.
- Non-obstetric surgery should proceed regardless of trimester if the maternal condition is **life-threatening** or risk of perforation is high.
*Spinal anesthesia to avoid fetal exposure to volatile anesthetics*
- **Spinal anesthesia** may not provide sufficient duration or the required level of **muscle relaxation** needed for an emergency exploratory surgery for perforation.
- It does not address the high **aspiration risk** in a symptomatic pregnant patient, potentially complicating airway management.
*Local anesthesia with conscious sedation to minimize fetal drug exposure*
- **Local anesthesia** alone is inadequate for an abdominal procedure involving **peritonitis** and bowel manipulation.
- **Conscious sedation** poses a significant risk of **hypoventilation** and gastric aspiration without providing a protected airway for the mother.
*Epidural anesthesia with incremental dosing to T4 level*
- While it provides a controlled block, the **time required** for onset is often too long for an emergency case like a **ruptured appendix**.
- Similar to spinal anesthesia, it fails to provide the **airway protection** necessary for a patient at high risk for aspiration during an emergent abdominal procedure.
Question 6: A 38-year-old woman with myasthenia gravis controlled on pyridostigmine presents for thymectomy. During anesthesia, the anesthesiologist notes prolonged neuromuscular blockade after standard-dose rocuronium. Her train-of-four ratio is 0.15 thirty minutes after the last dose. Neostigmine administration provides minimal improvement. Analyze the most likely cause and appropriate management.
A. Increased sensitivity to non-depolarizing relaxants; supportive ventilation until recovery (Correct Answer)
B. Inadequate neostigmine dosing; administer additional neostigmine and glycopyrrolate
C. Pseudocholinesterase deficiency; administer fresh frozen plasma
D. Cholinergic crisis from pyridostigmine; administer atropine
E. Hypermagnesemia from preoperative bowel prep; administer calcium gluconate
Explanation: ***Increased sensitivity to non-depolarizing relaxants; supportive ventilation until recovery***
- Patients with **myasthenia gravis** have a reduced number of functional **acetylcholine receptors**, making them extremely sensitive to **non-depolarizing neuromuscular blockers** like **rocuronium**.
- When a blockade is deep and unresponsive to reversal agents, the safest management is **supportive mechanical ventilation** and sedation until the drug is naturally metabolized.
*Inadequate neostigmine dosing; administer additional neostigmine and glycopyrrolate*
- **Neostigmine** has a "ceiling effect," and excess administration in myasthenic patients can trigger a **cholinergic crisis**, worsening muscle weakness.
- The poor response to the initial dose indicates **receptor saturation** or dysfunction, making further dosing ineffective and potentially dangerous.
*Pseudocholinesterase deficiency; administer fresh frozen plasma*
- **Pseudocholinesterase deficiency** affects the metabolism of **succinylcholine** and ester local anesthetics, not aminosteroid relaxants like **rocuronium**.
- **Rocuronium** is primarily eliminated via **biliary excretion** and hepatic metabolism, so plasma transfusion would not accelerate its clearance.
*Cholinergic crisis from pyridostigmine; administer atropine*
- While **pyridostigmine** can cause a cholinergic crisis, the clinical context of a low **Train-of-Four (TOF)** ratio specifically points to a residual drug-induced **neuromuscular blockade**.
- A cholinergic crisis would typically present with **miosis**, bradycardia, and excessive secretions (**SLUDGE** symptoms), which are not described here.
*Hypermagnesemia from preoperative bowel prep; administer calcium gluconate*
- While **magnesium** can potentiate neuromuscular blockade, there is no evidence in the history (such as renal failure or specific prep) to suggest **hypermagnesemia**.
- The patient's underlying **myasthenia gravis** is a much more direct and common explanation for the exaggerated response to **standard-dose relaxants**.
Question 7: A 55-year-old woman undergoes total thyroidectomy under general anesthesia. In the recovery room, she develops stridor, difficulty breathing, and her oxygen saturation drops to 88%. Her neck appears swollen and tense. Vital signs: BP 145/90 mmHg, HR 115/min. What is the most appropriate immediate management?
A. CT scan of the neck to evaluate hematoma size
B. High-dose corticosteroids and ICU monitoring
C. Immediate bedside opening of the wound to evacuate hematoma (Correct Answer)
D. Racemic epinephrine nebulizer and close observation
E. Emergency fiberoptic intubation in the operating room
Explanation: ***Immediate bedside opening of the wound to evacuate hematoma***
- This patient presents with an **expanding hematoma** causing **stridor** and airway compromise, which is a life-threatening surgical emergency post-thyroidectomy.
- Immediate decompression by opening the incision and staples at the **bedside** is the most critical step to relieve pressure on the **trachea** before attempting other interventions.
*CT scan of the neck to evaluate hematoma size*
- Imaging causes a dangerous delay in a patient with **active airway obstruction** and clinical signs of an expanding hematoma.
- Diagnosis is **clinical**, and management must prioritize stabilization and decompression over radiological confirmation.
*High-dose corticosteroids and ICU monitoring*
- Corticosteroids are used for **laryngeal edema** but are ineffective for mechanical compression caused by a **hematoma**.
- Monitoring without intervention in the presence of **stridor** and falling oxygen saturation leads to respiratory arrest.
*Racemic epinephrine nebulizer and close observation*
- This treatment is appropriate for mild **post-extubation croup** or edema but does not address the underlying **venous/arterial bleeding**.
- Relying on medical management when a **surgical airway obstruction** is present is contraindicated.
*Emergency fiberoptic intubation in the operating room*
- Intubation is extremely difficult in patients with a shifted and compressed trachea; attempting it without first **evacuating the hematoma** can waste vital time.
- The priority is to **decompress the neck** first to improve the success rate of subsequent airway management or to restore ventilation and oxygenation.
Question 8: A 72-year-old man with severe COPD (FEV1 40% predicted) requires emergency laparotomy for perforated diverticulitis. He is hemodynamically stable after resuscitation. The anesthesiologist is concerned about postoperative ventilator dependence. What perioperative strategy best reduces his risk of prolonged mechanical ventilation?
A. Laparoscopic approach instead of open surgery
B. Delay surgery for 48 hours of pulmonary optimization
C. Preoperative incentive spirometry training and epidural analgesia (Correct Answer)
D. High-dose corticosteroids starting 24 hours preoperatively
E. Prophylactic tracheostomy at the time of laparotomy
Explanation: ***Preoperative incentive spirometry training and epidural analgesia***
- **Epidural analgesia** provides superior pain control for upper abdominal incisions, which prevents **splinting** and allows for deeper breaths and an effective cough, significantly reducing **postoperative pulmonary complications (PPCs)**.
- Preoperative training in **incentive spirometry** and lung expansion techniques ensures the patient can effectively participate in respiratory therapy immediately after surgery to prevent **atelectasis**.
*Laparoscopic approach instead of open surgery*
- While **minimally invasive surgery** generally reduces pulmonary risk, it is often contraindicated or technically difficult in the setting of an emergency **perforated diverticulitis** with potential fecal peritonitis.
- The **pneumoperitoneum** required for laparoscopy can also compromise ventilation in patients with severe **COPD** due to increased intra-abdominal pressure.
*Delay surgery for 48 hours of pulmonary optimization*
- **Perforated diverticulitis** is a surgical emergency that requires immediate intervention to control sepsis; delaying surgery for pulmonary optimization would increase the risk of **septic shock**.
- Pulmonary optimization is ideal for elective procedures, but in emergency cases, stabilization is limited to **hemodynamic resuscitation** and prompt antibiotic administration.
*High-dose corticosteroids starting 24 hours preoperatively*
- Routine **high-dose corticosteroids** are not indicated for COPD patients unless they are experiencing an acute exacerbation, and they can impair **wound healing** and increase the risk of infection after bowel surgery.
- While they may help with **bronchodilation**, they do not address the mechanical causes of postoperative ventilator dependence as effectively as proper pain management.
*Prophylactic tracheostomy at the time of laparotomy*
- **Prophylactic tracheostomy** is an invasive procedure with its own set of complications and is not indicated until a patient has failed repeated attempts at **extubation**.
- Effective perioperative management should focus on avoiding the need for a tracheostomy by minimizing **mechanical ventilation** duration through optimal analgesia and chest physiotherapy.
Question 9: A 45-year-old woman develops malignant hyperthermia during general anesthesia for cholecystectomy. She presents with rapidly rising temperature (40.5°C), muscle rigidity, tachycardia (140/min), and hypercarbia (ETCO2 78 mmHg). What is the immediate first-line treatment?
A. Administration of succinylcholine to control muscle rigidity
B. Beta-blocker administration to control tachycardia
C. Immediate discontinuation of volatile anesthetic and administration of dantrolene 2.5 mg/kg IV (Correct Answer)
D. Bicarbonate infusion to correct metabolic acidosis
E. Aggressive cooling with ice packs and cold saline lavage
Explanation: ***Immediate discontinuation of volatile anesthetic and administration of dantrolene 2.5 mg/kg IV***
- The gold standard for **malignant hyperthermia** is the immediate cessation of triggers and administration of **dantrolene**, which inhibits **calcium release** from the **ryanodine receptor**.
- Rapid intervention is critical to reverse the hypermetabolic state, lower **ETCO2**, and prevent multi-organ failure.
*Administration of succinylcholine to control muscle rigidity*
- **Succinylcholine** is actually a potent **triggering agent** for malignant hyperthermia and would worsen the muscle rigidity and metabolic crisis.
- Using this depolarizing neuromuscular blocker is **contraindicated** once a diagnosis of malignant hyperthermia is suspected.
*Beta-blocker administration to control tachycardia*
- Tachycardia is a **secondary symptom** of the underlying hypermetabolic state; treating it with beta-blockers without addressing the cause can lead to **cardiovascular collapse**.
- Potential interactions between some beta-blockers and dantrolene may also lead to severe **hyperkalemia** and myocardial depression.
*Bicarbonate infusion to correct metabolic acidosis*
- While correcting acidosis is a supportive measure, it does not address the **pathophysiology** of the uncontrolled calcium release in the muscles.
- Sodium **bicarbonate** should only be secondary to the primary treatment of **dantrolene** and hyperventilation.
*Aggressive cooling with ice packs and cold saline lavage*
- **Active cooling** is an important supportive therapy, but it is not the first-line pharmacologic treatment for the hypermetabolic cascade.
- Solely focusing on cooling without administering **dantrolene** will fail to stop the source of excessive **heat production**.
Question 10: A 68-year-old man with coronary artery disease is scheduled for elective inguinal hernia repair under general anesthesia. His medications include aspirin, metoprolol, and atorvastatin. He had a drug-eluting stent placed 8 weeks ago. His cardiologist recommends continuing aspirin perioperatively. What is the most appropriate perioperative management of his antiplatelet therapy?
A. Continue aspirin alone throughout the perioperative period (Correct Answer)
B. Delay surgery until 12 months after stent placement
C. Continue aspirin and add clopidogrel throughout the perioperative period
D. Bridge with heparin after stopping aspirin preoperatively
E. Discontinue aspirin 7 days before surgery and resume postoperatively
Explanation: ***Continue aspirin alone throughout the perioperative period***
- For patients with a **drug-eluting stent (DES)** placed within the last 6 months, **aspirin** should be continued through non-cardiac surgery to minimize the risk of **stent thrombosis**.
- In low-bleeding-risk procedures like **inguinal hernia repair**, the risk of catastrophic cardiovascular events outweighs the risk of surgical hemorrhage.
*Delay surgery until 12 months after stent placement*
- Current guidelines suggest that elective surgery can be safely considered **3 to 6 months** after DES placement if necessary, making a 12-month delay excessive.
- While delaying surgery beyond 6 months is ideal for elective cases, mandatory postponement to 12 months is no longer the standard requirement for newer generation stents.
*Continue aspirin and add clopidogrel throughout the perioperative period*
- Maintaining **dual antiplatelet therapy (DAPT)** perioperatively significantly increases the risk of **surgical site bleeding** and hematoma formation.
- The P2Y12 inhibitor (e.g., **clopidogrel**) is typically discontinued 5-7 days before surgery, while aspirin is maintained as a monotherapy.
*Bridge with heparin after stopping aspirin preoperatively*
- **Heparin bridging** is intended for patients on anticoagulants like **warfarin**, not for patients on antiplatelet therapy for coronary stents.
- Stopping aspirin for bridging increases the risk of **thrombotic events** without providing the specific platelet inhibition needed to keep the stent patent.
*Discontinue aspirin 7 days before surgery and resume postoperatively*
- Discontinuing aspirin in patients with a recent DES increases the risk of **major adverse cardiac events (MACE)** and perioperative myocardial infarction.
- Recovery of platelet function after stopping aspirin takes several days, leaving a dangerous **pro-thrombotic window** during the physiological stress of surgery.
