The surgical equipment used during a craniectomy is sterilized using pressurized steam at 121°C for 15 minutes. Reuse of these instruments can cause transmission of which of the following pathogens?
Q2
A 50-year-old male presents to the emergency with abdominal pain. He reports he has had abdominal pain associated with meals for several months and has been taking over the counter antacids as needed, but experienced significant worsening pain one hour ago in the epigastric region. The patient reports the pain radiating to his shoulders. Vital signs are T 38, HR 120, BP 100/60, RR 18, SpO2 98%. Physical exam reveals diffuse abdominal rigidity with rebound tenderness. Auscultation reveals hypoactive bowel sounds. Which of the following is the next best step in management?
Q3
A 63-year-old woman is brought to the emergency department because of severe abdominal pain and vomiting for 3 hours. She had previous episodes of abdominal pain that lasted for 10–15 minutes and resolved with antacids. She lives with her daughter and grandchildren. She divorced her husband last year. She is alert and oriented. Her temperature is 37.3°C (99.1°F), pulse is 134/min, and blood pressure is 90/70 mm Hg. The abdomen is rigid and diffusely tender. Guarding and rebound tenderness are present. Rectal examination shows a collapsed rectum. Infusion of 0.9% saline is begun and a CT of the abdomen shows intestinal perforation. The surgeon discusses the need for emergent exploratory laparotomy with the patient and she agrees to it. Written informed consent is obtained. While in the holding area awaiting emergent transport to the operating room, she calls for the surgeon and informs him that she no longer wants the surgery. He explains the risks of not performing the surgery to her and she indicates she understands but is adamant about not proceeding with surgery. Which of the following is the most appropriate next step in management?
Q4
A 43-year-old male visits the emergency room around 4 weeks after getting bitten by a bat during a cave diving trip. After cleansing the wound with water, the patient reports that he felt well enough not to seek medical attention immediately following his trip. He does endorse feeling feverish in the past week but a new onset of photophobia and irritability led him to seek help today. What would the post-mortem pathology report show if the patient succumbs to this infection?
Q5
A 30-year-old male presents with a testicular mass of unknown duration. The patient states he first noticed something unusual with his right testicle two weeks ago, but states he did not think it was urgent because it was not painful and believed it would resolve on its own. It has not changed since he first noticed the mass, and the patient still denies pain. On exam, the patient’s right testicle is non-tender, and a firm mass is felt. There is a negative transillumination test, and the mass is non-reducible. Which of the following is the best next step in management?
Q6
A 32-year-old man comes to the emergency department for acute pain in the left eye. He reports having awoken in the morning with a foreign body sensation. He had forgotten to remove his contact lenses before sleeping. Following lens removal, he experienced immediate pain, discomfort, and tearing of the left eye. He reports that the foreign body sensation persists and that rinsing with water has not improved the pain. He has been wearing contact lenses for 4 years and occasionally forgets to remove them at night. He has no history of serious medical illness. On examination, the patient appears distressed with pain and photophobia in the left eye. Administration of a topical anesthetic relieves the pain. Visual acuity is 20/20 in both eyes. Ocular motility and pupillary response are normal. The corneal reflex is normal and symmetric in both eyes. Which of the following is most likely to establish the diagnosis in this patient?
Q7
A 64-year-old woman presents to the physician’s office to find out the results of her recent abdominal CT. She had been complaining of fatigue, weight loss, and jaundice for 6 months prior to seeing the physician. The patient has a significant medical history of hypothyroidism, generalized anxiety disorder, and hyperlipidemia. She takes levothyroxine, sertraline, and atorvastatin. The vital signs are stable today. On physical examination, her skin shows slight jaundice, but no scleral icterus is present. The palpation of the abdomen reveals no tenderness, guarding, or masses. The CT results shows a 3 x 3 cm mass located at the head of the pancreas. Which of the following choices is most appropriate for delivering bad news to the patient?
Q8
A 35-year-old man arrives at the emergency department within minutes after a head-on motor vehicle accident. He suffered from blunt abdominal trauma, several lacerations to his face as well as lacerations to his upper and lower extremities. The patient is afebrile, blood pressure is 45/25 mmHg and pulse is 160/minute. A CBC is obtained and is most likely to demonstrate which of the following?
Q9
A 30-year-old male gang member is brought to the emergency room with a gunshot wound to the abdomen. The patient was intubated and taken for an exploratory laparotomy, which found peritoneal hemorrhage and injury to the small bowel. He required 5 units of blood during this procedure. Following the operation, the patient was sedated and remained on a ventilator in the surgical intensive care unit (SICU). The next day, a central line is placed and the patient is started on total parenteral nutrition. Which of the following complications is most likely in this patient?
Q10
A 35-year-old man suffers severe polytrauma including traumatic brain injury (GCS 6), pulmonary contusions, splenic laceration, and open femur fracture. He undergoes damage control surgery with splenectomy and external fixation. On ICU day 4, he develops worsening hypoxemia (PaO2/FiO2 ratio 150), bilateral infiltrates on chest X-ray, normal pulmonary capillary wedge pressure, petechiae, and altered mental status beyond his head injury. Fat globules are noted in urine. Platelet count drops from 245,000 to 89,000/μL. Evaluate the diagnosis and management priority.
Retained surgical items US Medical PG Practice Questions and MCQs
Question 1: The surgical equipment used during a craniectomy is sterilized using pressurized steam at 121°C for 15 minutes. Reuse of these instruments can cause transmission of which of the following pathogens?
A. Non-enveloped viruses
B. Sporulating bacteria
C. Prions (Correct Answer)
D. Enveloped viruses
E. Yeasts
Explanation: ***Prions***
- Prions are **abnormally folded proteins** that are highly resistant to standard sterilization methods like steam autoclaving at 121°C, making them a risk for transmission through reused surgical instruments.
- They cause transmissible spongiform encephalopathies (TSEs) like **Creutzfeldt-Jakob disease**, where even trace amounts can be highly infectious.
*Non-enveloped viruses*
- Non-enveloped viruses are generally **more resistant to heat and disinfectants** than enveloped viruses but are typically inactivated by recommended steam sterilization protocols.
- Standard autoclaving conditions are effective in destroying most non-enveloped viruses.
*Sporulating bacteria*
- **Bacterial spores**, such as those from *Clostridium* or *Bacillus*, are known for their high resistance to heat and chemicals, but are usually **inactivated by steam sterilization at 121°C** for 15 minutes.
- This method is specifically designed to kill bacterial spores effectively.
*Enveloped viruses*
- Enveloped viruses are the **least resistant to heat and chemical disinfectants** due to their lipid envelope.
- They are readily **inactivated by standard steam sterilization** at 121°C.
*Yeasts*
- **Yeasts** are eukaryotic microorganisms that are typically **susceptible to heat sterilization**.
- They are effectively killed by typical steam autoclaving conditions used for surgical instruments.
Question 2: A 50-year-old male presents to the emergency with abdominal pain. He reports he has had abdominal pain associated with meals for several months and has been taking over the counter antacids as needed, but experienced significant worsening pain one hour ago in the epigastric region. The patient reports the pain radiating to his shoulders. Vital signs are T 38, HR 120, BP 100/60, RR 18, SpO2 98%. Physical exam reveals diffuse abdominal rigidity with rebound tenderness. Auscultation reveals hypoactive bowel sounds. Which of the following is the next best step in management?
A. Admission and observation
B. Chest radiograph
C. 12 lead electrocardiogram
D. Abdominal CT scan (Correct Answer)
E. Abdominal ultrasound
Explanation: ***Abdominal CT scan***
- This patient presents with classic signs of a **perforated peptic ulcer**: sudden severe epigastric pain radiating to the shoulders (diaphragmatic irritation), fever, tachycardia, hypotension, and peritoneal signs (rigid abdomen with rebound tenderness).
- While the patient shows signs of **early shock** (BP 100/60, HR 120), he is **conscious and maintaining adequate oxygenation** (SpO2 98%), making him stable enough for rapid CT imaging.
- **Abdominal CT scan** is the **most sensitive and specific** test for detecting free air, identifying the location of perforation, and assessing for complications (abscess, contained perforation).
- CT provides **critical surgical planning information** about the extent and location of perforation, which can guide the surgical approach.
- This should be followed by **immediate surgical consultation** and preparation for emergency laparotomy.
*Chest radiograph*
- While an **upright chest X-ray** can detect free air under the diaphragm (pneumoperitoneum), it has **lower sensitivity** (70-80%) compared to CT scan (>95%).
- In a patient who is stable enough for imaging, **CT is preferred** as it provides more information for surgical planning.
- Chest X-ray would be the appropriate choice only if **CT is unavailable** or if the patient is **too unstable** to be transported to the CT scanner.
*Admission and observation*
- This patient has **acute peritonitis** from a likely perforated viscus, which is a **surgical emergency** requiring operative intervention.
- Observation would be inappropriate and dangerous, leading to **septic shock**, **multi-organ failure**, and death.
*12 lead electrocardiogram*
- While epigastric pain can sometimes be cardiac in origin, the **peritoneal signs** (rigid abdomen, rebound tenderness, hypoactive bowel sounds) clearly indicate an **intra-abdominal pathology**.
- The pain radiation to **both shoulders** (Kehr's sign) suggests diaphragmatic irritation from intraperitoneal air or fluid, not cardiac ischemia.
*Abdominal ultrasound*
- Ultrasound is useful for evaluating **solid organ injury**, **free fluid**, and conditions like **cholecystitis** or **appendicitis**.
- However, it is **poor at detecting free air** due to bowel gas artifact and has limited sensitivity for perforated viscus.
- It would not provide adequate information for this surgical emergency.
Question 3: A 63-year-old woman is brought to the emergency department because of severe abdominal pain and vomiting for 3 hours. She had previous episodes of abdominal pain that lasted for 10–15 minutes and resolved with antacids. She lives with her daughter and grandchildren. She divorced her husband last year. She is alert and oriented. Her temperature is 37.3°C (99.1°F), pulse is 134/min, and blood pressure is 90/70 mm Hg. The abdomen is rigid and diffusely tender. Guarding and rebound tenderness are present. Rectal examination shows a collapsed rectum. Infusion of 0.9% saline is begun and a CT of the abdomen shows intestinal perforation. The surgeon discusses the need for emergent exploratory laparotomy with the patient and she agrees to it. Written informed consent is obtained. While in the holding area awaiting emergent transport to the operating room, she calls for the surgeon and informs him that she no longer wants the surgery. He explains the risks of not performing the surgery to her and she indicates she understands but is adamant about not proceeding with surgery. Which of the following is the most appropriate next step in management?
A. Consult hospital ethics committee
B. Obtain consent from the patient's daughter
C. Obtain consent from the patient's ex-husband
D. Continue with emergency life-saving surgery
E. Cancel the surgery (Correct Answer)
Explanation: ***Cancel the surgery***
- The patient is **alert and oriented** and has indicated she understands the risks of refusing surgery, demonstrating **decision-making capacity**. An adult with intact capacity has the right to refuse medical treatment, even if it is life-saving.
- While the decision may seem medically unwise, **patient autonomy** is a fundamental ethical principle that must be respected once capacity is confirmed.
*Consult hospital ethics committee*
- An ethics committee consultation is typically reserved for situations where there is **uncertainty about a patient's capacity**, a conflict among healthcare providers, or a difficult ethical dilemma where principles of patient care are in clear conflict.
- In this case, the patient's capacity seems clear, and her refusal is unequivocal.
*Obtain consent from the patient's daughter*
- The patient's daughter cannot provide consent for her mother if the mother is **competent and able to make her own decisions**. **Surrogate decision-makers** are only legally authorized when the patient lacks capacity.
- The patient's expressed wishes directly override any potential preferences of her next-of-kin.
*Obtain consent from the patient's ex-husband*
- As the patient is divorced, her ex-husband has **no legal standing** to make medical decisions on her behalf.
- Even if they were still married, a spouse can only act as a surrogate if the patient lacks decision-making capacity.
*Continue with emergency life-saving surgery*
- Performing surgery against a **competent patient's explicit refusal** would be an act of **battery** and a violation of her **autonomy**.
- Even in life-threatening situations, a patient with capacity has the right to refuse treatment.
Question 4: A 43-year-old male visits the emergency room around 4 weeks after getting bitten by a bat during a cave diving trip. After cleansing the wound with water, the patient reports that he felt well enough not to seek medical attention immediately following his trip. He does endorse feeling feverish in the past week but a new onset of photophobia and irritability led him to seek help today. What would the post-mortem pathology report show if the patient succumbs to this infection?
A. Howell-Jolly bodies
B. Heinz bodies
C. Psammoma bodies
D. Pick bodies
E. Negri bodies (Correct Answer)
Explanation: ***Negri bodies***
- This patient's symptoms (fever, photophobia, irritability) and history of a bat bite point to rabies. **Negri bodies** are eosinophilic inclusions found in the cytoplasm of hippocampal and Purkinje cells in cases of rabies.
- They are **pathognomonic** for rabies infection and represent viral nucleocapsid proteins.
*Howell-Jolly bodies*
- These are **nuclear remnants** found in red blood cells that indicate impaired splenic function or asplenia.
- They are not associated with viral infections like rabies and are observed in conditions like sickle cell disease or after splenectomy.
*Heinz bodies*
- **Heinz bodies** are inclusions within red blood cells composed of denatured hemoglobin.
- They are typically seen in conditions involving **oxidative stress** to red blood cells, such as G6PD deficiency or alpha-thalassemia, not rabies.
*Psammoma bodies*
- These are **calcified, laminated, concentric spherules** found in some tumors (e.g., papillary thyroid carcinoma, meningioma, serous ovarian cystadenocarcinoma).
- They are a marker of specific neoplastic conditions and have no relevance to viral infections.
*Pick bodies*
- **Pick bodies** are aggregates of tau protein found in neurons, characteristic of **Pick's disease**, a type of frontotemporal dementia.
- They are neurodegenerative markers and are unrelated to infectious diseases.
Question 5: A 30-year-old male presents with a testicular mass of unknown duration. The patient states he first noticed something unusual with his right testicle two weeks ago, but states he did not think it was urgent because it was not painful and believed it would resolve on its own. It has not changed since he first noticed the mass, and the patient still denies pain. On exam, the patient’s right testicle is non-tender, and a firm mass is felt. There is a negative transillumination test, and the mass is non-reducible. Which of the following is the best next step in management?
A. MRI abdomen and pelvis
B. CT abdomen and pelvis
C. Testicular ultrasound (Correct Answer)
D. Send labs
E. Needle biopsy
Explanation: ***Testicular ultrasound***
- A **testicular ultrasound** is the diagnostic study of choice for evaluating a **scrotal mass** to determine if it is intratesticular or extratesticular, and to assess its characteristics (solid, cystic).
- The patient's presentation with a **painless, firm, non-transilluminating testicular mass** is highly suspicious for a **testicular tumor**, making immediate ultrasound essential to confirm the diagnosis.
*MRI abdomen and pelvis*
- While MRI can provide detailed anatomical information, it is typically performed for **staging** a confirmed testicular cancer, not as the initial diagnostic step.
- Its higher cost and longer imaging time make it less suitable for initial evaluation than ultrasound.
*CT abdomen and pelvis*
- CT scans are primarily used for **staging** testicular cancer, particularly to evaluate for **lymph node involvement** or distant metastases.
- It does not provide the resolution needed for precise characterization of an intratesticular mass and exposes the patient to **ionizing radiation**.
*Send labs*
- **Tumor markers** such as **alpha-fetoprotein (AFP)**, **beta-human chorionic gonadotropin (beta-hCG)**, and **lactate dehydrogenase (LDH)** are important for the diagnosis, staging, and monitoring of testicular cancer.
- However, blood tests alone cannot definitively diagnose a testicular mass or determine its nature; imaging is necessary.
*Needle biopsy*
- **Needle biopsy** is generally **contraindicated** for suspected testicular masses due to the risk of **tumor seeding** within the scrotum or along the biopsy tract.
- Diagnosis and tumor removal are typically achieved through an **inguinal orchiectomy** if malignancy is suspected.
Question 6: A 32-year-old man comes to the emergency department for acute pain in the left eye. He reports having awoken in the morning with a foreign body sensation. He had forgotten to remove his contact lenses before sleeping. Following lens removal, he experienced immediate pain, discomfort, and tearing of the left eye. He reports that the foreign body sensation persists and that rinsing with water has not improved the pain. He has been wearing contact lenses for 4 years and occasionally forgets to remove them at night. He has no history of serious medical illness. On examination, the patient appears distressed with pain and photophobia in the left eye. Administration of a topical anesthetic relieves the pain. Visual acuity is 20/20 in both eyes. Ocular motility and pupillary response are normal. The corneal reflex is normal and symmetric in both eyes. Which of the following is most likely to establish the diagnosis in this patient?
A. CT scan of the orbit
B. Cultures of ocular discharge
C. Gonioscopy
D. Ocular ultrasonography
E. Fluorescein examination (Correct Answer)
Explanation: ***Fluorescein examination***
- The patient's symptoms (acute pain, foreign body sensation, tearing, photophobia after prolonged contact lens wear) are highly suggestive of a **corneal abrasion** or **ulcer**.
- A **fluorescein examination** is the definitive diagnostic tool for identifying corneal epithelial defects. Fluorescein dye will stain areas where epithelial cells are missing, appearing as bright green under a cobalt blue light.
*CT scan of the orbit*
- A CT scan of the orbit is used to evaluate for **orbital cellulitis**, **fractures**, or **intraorbital foreign bodies**, which are not indicated by the patient's presentation.
- The patient's symptoms are localized to the surface of the eye, and the foreign body sensation is due to direct epithelial damage, not a deeper orbital issue.
*Cultures of ocular discharge*
- While cultures may be necessary if a **corneal ulcer** with infection is suspected, the initial diagnostic step for identifying the defect itself is fluorescein staining.
- Cultures would be performed after visualizing an ulcer and if there are signs of infection, such as purulent discharge or infiltrates.
*Gonioscopy*
- **Gonioscopy** is a specialized examination used to visualize the **anterior chamber angle** of the eye to assess for glaucoma or other angle abnormalities.
- It is not indicated for the diagnosis of corneal surface defects like abrasions or ulcers.
*Ocular ultrasonography*
- **Ocular ultrasonography** is primarily used to visualize structures within the eye that cannot be seen due to opacities (e.g., dense cataracts, vitreous hemorrhage) or to assess for retinal detachments or tumors.
- It is not useful for diagnosing surface corneal issues as presented in this case.
Question 7: A 64-year-old woman presents to the physician’s office to find out the results of her recent abdominal CT. She had been complaining of fatigue, weight loss, and jaundice for 6 months prior to seeing the physician. The patient has a significant medical history of hypothyroidism, generalized anxiety disorder, and hyperlipidemia. She takes levothyroxine, sertraline, and atorvastatin. The vital signs are stable today. On physical examination, her skin shows slight jaundice, but no scleral icterus is present. The palpation of the abdomen reveals no tenderness, guarding, or masses. The CT results shows a 3 x 3 cm mass located at the head of the pancreas. Which of the following choices is most appropriate for delivering bad news to the patient?
A. Refer the patient to an oncologist without informing the patient of their cancer
B. Ask that a spouse or close relative come to the appointment, explain to them the bad news, and see if they will tell the patient since they have a closer relationship
C. Set aside an appropriate amount of time in your schedule, and ensure you will not have any interruptions as you explain the bad news to the patient (Correct Answer)
D. Call the patient over the phone to break the bad news, and tell them they can make an office visit if they prefer
E. Train one of the nursing staff employees on this matter, and delegate this duty as one of their job responsibilities
Explanation: ***Set aside an appropriate amount of time in your schedule, and ensure you will not have any interruptions as you explain the bad news to the patient***
- Delivering bad news requires a **dedicated, uninterrupted environment** to allow for clear communication, emotional support, and time for the patient to process the information and ask questions.
- Adequate time ensures that the physician can address immediate concerns, explore the patient's understanding, and collaboratively plan the next steps, fostering **trust and patient-centered care**.
*Refer the patient to an oncologist without informing the patient of their cancer*
- This approach violates the principle of **patient autonomy** and the ethical obligation to provide complete and accurate information about their diagnosis.
- Patients have a right to know their medical status and actively participate in decisions regarding their care, which includes being informed of a **cancer diagnosis**.
*Ask that a spouse or close relative come to the appointment, explain to them the bad news, and see if they will tell the patient since they have a closer relationship*
- While involving family is important for support, the **primary responsibility** to deliver difficult medical news rests with the physician directly to the patient.
- This avoids potential miscommunication, ensures the patient receives accurate information from the medical professional, and respects the patient's individual right to hear their diagnosis without an intermediary.
*Call the patient over the phone to break the bad news, and tell them they can make an office visit if they prefer*
- Delivering significant bad news, especially a potential cancer diagnosis, over the phone is generally **inappropriate and insensitive**, as it lacks the personal presence and immediate support needed.
- A phone call does not allow for non-verbal cues, immediate emotional support, or a comprehensive discussion of complex medical information, making an **in-person consultation preferential**.
*Train one of the nursing staff employees on this matter, and delegate this duty as one of their job responsibilities*
- Delivering a new and serious medical diagnosis, such as cancer, is primarily the **responsibility of the treating physician** due to the complexity of the information and the need for medical expertise.
- While nurses play a crucial role in patient education and support, conveying initial diagnoses of this gravity falls outside their typical scope of practice and could erode **patient trust**.
Question 8: A 35-year-old man arrives at the emergency department within minutes after a head-on motor vehicle accident. He suffered from blunt abdominal trauma, several lacerations to his face as well as lacerations to his upper and lower extremities. The patient is afebrile, blood pressure is 45/25 mmHg and pulse is 160/minute. A CBC is obtained and is most likely to demonstrate which of the following?
A. Hb 17 g/dL, Hct 20%
B. Hb 15 g/dL, Hct 45% (Correct Answer)
C. Hb 5 g/dL, Hct 30%
D. Hb 20 g/dL, Hct 60%
E. Hb 5 g/dL, Hct 20%
Explanation: ***Hb 15 g/dL, Hct 45%***
- This option represents **normal hemoglobin and hematocrit values**, which are expected in the **initial minutes following acute hemorrhage**.
- In acute blood loss, **whole blood is lost** (both RBCs and plasma together), so the **concentration of RBCs remains unchanged** initially.
- **Hemodilution has not yet occurred**, as there hasn't been enough time for fluid shifts from the extravascular to the intravascular space to dilute the blood.
- This is a **critical teaching point**: early CBC values can be **falsely reassuring** and don't reflect the severity of hemorrhagic shock.
*Hb 17 g/dL, Hct 20%*
- This option shows a **medically implausible combination** - the normal Hb:Hct ratio is approximately **1:3**, so an Hb of 17 g/dL should correspond to an Hct of approximately 51%, not 20%.
- This combination cannot occur physiologically and does not represent any stage of acute blood loss.
*Hb 5 g/dL, Hct 30%*
- This shows an **incorrect Hb:Hct ratio** (6:1 instead of the expected 3:1) - if Hb is 5 g/dL, the Hct should be approximately 15%, not 30%.
- While severe anemia can occur with massive blood loss, this would only be apparent **hours after injury** once hemodilution from fluid shifts occurs, not within minutes.
- The implausible ratio makes this medically incorrect.
*Hb 20 g/dL, Hct 60%*
- These values represent **polycythemia** (abnormally high red blood cell counts), which is the opposite of what would be expected after acute traumatic blood loss.
- The Hb:Hct ratio is appropriate (1:3), but the elevated values suggest chronic hypoxemia, dehydration, or myeloproliferative disorders - not acute hemorrhage.
*Hb 5 g/dL, Hct 20%*
- This shows an **incorrect Hb:Hct ratio** (4:1 instead of the expected 3:1) - if Hb is 5 g/dL, the Hct should be approximately 15%, not 20%.
- Even if we accept these as severe anemia values, they would only be seen **several hours after injury** when sufficient time has passed for fluid shifts and hemodilution to occur, not within minutes of the trauma.
Question 9: A 30-year-old male gang member is brought to the emergency room with a gunshot wound to the abdomen. The patient was intubated and taken for an exploratory laparotomy, which found peritoneal hemorrhage and injury to the small bowel. He required 5 units of blood during this procedure. Following the operation, the patient was sedated and remained on a ventilator in the surgical intensive care unit (SICU). The next day, a central line is placed and the patient is started on total parenteral nutrition. Which of the following complications is most likely in this patient?
A. Mesenteric ischemia
B. Hypocalcemia
C. Refeeding syndrome
D. Sepsis (Correct Answer)
E. Cholelithiasis
Explanation: ***Sepsis***
- This patient has undergone **major abdominal surgery** after a **gunshot wound**, which carries a high risk of **peritoneal contamination** and subsequent infection.
- He also has several risk factors for sepsis, including **intubation**, central line placement, and possibly prolonged ventilation, all of which increase the risk of nosocomial infections and subsequent sepsis.
*Mesenteric ischemia*
- While possible in critically ill patients, there is no direct evidence such as advanced age, atherosclerosis, or specific signs of **bowel ischemia** (e.g., severe abdominal pain disproportionate to exam, bloody diarrhea) presenting in this case.
- The initial injury was to the small bowel, but the current context points more to systemic complications rather than a focal vascular event.
*Hypocalcemia*
- Hypocalcemia can occur in critically ill patients due to various reasons, but it is not the *most likely* complication given the patient's presentation primarily focused on surgical trauma and subsequent interventions.
- Dilutional effects from massive transfusions or **citrate toxicity** could contribute to temporary hypocalcemia, but sepsis poses a more immediate and widespread threat.
*Refeeding syndrome*
- Refeeding syndrome occurs when severely malnourished patients are rapidly refed, leading to shifts in **electrolytes** (especially **phosphate**, potassium, magnesium).
- Although the patient is starting **total parenteral nutrition (TPN)**, there's no indication of prior severe malnutrition, making sepsis a more prominent immediate concern due to the gunshot wound and surgery.
*Cholelithiasis*
- **Cholelithiasis** (gallstones) can be a long-term complication of total parenteral nutrition (TPN) due to gallbladder stasis.
- However, it is unlikely to develop so acutely within a day of starting TPN and is thus not the most immediate or likely complication for this patient's acute critical state.
Question 10: A 35-year-old man suffers severe polytrauma including traumatic brain injury (GCS 6), pulmonary contusions, splenic laceration, and open femur fracture. He undergoes damage control surgery with splenectomy and external fixation. On ICU day 4, he develops worsening hypoxemia (PaO2/FiO2 ratio 150), bilateral infiltrates on chest X-ray, normal pulmonary capillary wedge pressure, petechiae, and altered mental status beyond his head injury. Fat globules are noted in urine. Platelet count drops from 245,000 to 89,000/μL. Evaluate the diagnosis and management priority.
A. Sepsis from missed abdominal injury; return to OR for re-exploration
B. Transfusion-related acute lung injury; diuresis and transfusion avoidance
C. Disseminated intravascular coagulation; aggressive factor replacement
D. Acute respiratory distress syndrome; increase PEEP and lung-protective ventilation
E. Fat embolism syndrome; supportive care and definitive fracture fixation when stable (Correct Answer)
Explanation: ***Fat embolism syndrome; supportive care and definitive fracture fixation when stable***
- This patient presents with the classic **Gurd’s triad**: respiratory distress (hypoxemia, infiltrates), neurologic symptoms (altered mental status), and a **petechial rash** 24–72 hours after a **long bone fracture**.
- Laboratory findings of **thrombocytopenia** and **fat globules in urine** further confirm the diagnosis, with management prioritizing **supportive care** and stabilization before definitive orthopedic intervention.
*Sepsis from missed abdominal injury; return to OR for re-exploration*
- While common in trauma, sepsis typically presents with **hemodynamic instability**, fever, or leukocytosis, rather than the specific petechial rash seen here.
- Re-exploration is unnecessary unless there is evidence of **peritonitis** or a clear source of infection that cannot be managed medically.
*Transfusion-related acute lung injury; diuresis and transfusion avoidance*
- **TRALI** presents with acute hypoxemia and bilateral infiltrates shortly after blood administration, but does not explain the **petechiae** or fat globules.
- Unlike circulatory overload, TRALI management focuses on **supportive ventilation** rather than aggressive **diuresis**, which might worsen the patient's condition.
*Disseminated intravascular coagulation; aggressive factor replacement*
- **DIC** can cause a drop in platelets and widespread bleeding, but it is usually a consumptive process resulting in prolonged **PT/PTT** and elevated **D-dimer**.
- While fat embolism can trigger secondary coagulopathy, the primary pathology here is the embolism itself, and factor replacement is only indicated for active, severe hemorrhage.
*Acute respiratory distress syndrome; increase PEEP and lung-protective ventilation*
- While the P/F ratio of 150 meets criteria for **ARDS**, this diagnosis alone fails to account for the **petechial rash** and systemic fat globules.
- Lung-protective ventilation is part of the treatment for fat embolism, but the question asks for the most comprehensive diagnosis and management strategy for all clinical features.
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