Postoperative bleeding US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Postoperative bleeding. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Postoperative bleeding US Medical PG Question 1: A 40-year-old Caucasian male presents to the emergency room after being shot in the arm in a hunting accident. His shirt is soaked through with blood. He has a blood pressure of 65/40, a heart rate of 122, and his skin is pale, cool to the touch, and moist. This patient is most likely experiencing all of the following EXCEPT:
- A. Decreased sarcomere length in the myocardium
- B. Increased stroke volume (Correct Answer)
- C. Confusion and irritability
- D. Decreased preload
- E. Increased thromboxane A2
Postoperative bleeding Explanation: ***Increased stroke volume***
- The patient is experiencing **hypovolemic shock** due to significant blood loss, meaning their **cardiac output** is severely compromised.
- In shock, the heart attempts to compensate by increasing **heart rate**, but **stroke volume** is typically decreased due to reduced **preload**.
*Decreased sarcomere length in the myocardium*
- In situations of significant blood loss and **decreased preload**, there is less venous return to the heart, leading to reduced end-diastolic volume.
- According to the **Frank-Starling law**, reduced end-diastolic volume results in shorter initial sarcomere length, which reduces the force of contraction and thus, **stroke volume**.
*Confusion and irritability*
- **Hypovolemic shock** leads to widespread **tissue hypoperfusion**, especially to vital organs like the brain.
- Reduced cerebral blood flow results in impaired brain function, manifesting as **confusion, irritability**, and altered mental status.
*Decreased preload*
- Significant blood loss leads to a reduction in the **total circulating blood volume**.
- This reduction directly decreases the venous return to the heart, thus lowering the **end-diastolic volume** and subsequently, the **preload**.
*Increased thromboxane A2*
- In response to **vascular injury and bleeding**, the body initiates hemostasis, a critical component of which is platelet aggregation.
- **Thromboxane A2** is a potent vasoconstrictor and platelet aggregator released by activated platelets to form a **platelet plug** and help stop bleeding.
Postoperative bleeding US Medical PG Question 2: A 28-year-old man presents for severe abdominal pain and is diagnosed with appendicitis. He is taken for emergent appendectomy. During the procedure, the patient has massive and persistent bleeding requiring a blood transfusion. The preoperative laboratory studies showed a normal bleeding time, normal prothrombin time (PT), an INR of 1.0, and a normal platelet count. Postoperatively, when the patient is told about the complications during the surgery, he recalls that he forgot to mention that he has a family history of an unknown bleeding disorder. The postoperative laboratory tests reveal a prolonged partial thromboplastin time (PTT). Which of the following is the most likely diagnosis in this patient?
- A. von Willebrand disease
- B. Bernard-Soulier syndrome
- C. Thrombotic thrombocytopenic purpura
- D. Hemophilia A (Correct Answer)
- E. Glanzmann thrombasthenia
Postoperative bleeding Explanation: ***Hemophilia A***
- The patient's presentation with **severe, persistent bleeding** during surgery despite normal preoperative coagulation studies (PT, INR, platelet count) and a subsequent **prolonged PTT** strongly indicates a **factor deficiency in the intrinsic pathway**.
- **Hemophilia A**, an X-linked recessive disorder, is caused by a deficiency of **Factor VIII**, leading to a prolonged PTT and deep tissue bleeding, which fits the clinical picture and family history.
*von Willebrand disease*
- This condition typically presents with **mucocutaneous bleeding** (e.g., nosebleeds, menorrhagia) and can have a prolonged bleeding time, but the primary defect is in **platelet adhesion**, not usually massive operative bleeding with normal platelet count.
- While **von Willebrand factor (vWF)** carries Factor VIII, a primary deficiency of vWF would affect factor VIII levels but the presentation and normal bleeding time here make it less likely than direct factor VIII deficiency.
*Bernard-Soulier syndrome*
- This is a **platelet disorder** characterized by defective **glycoprotein Ib/IX/V complex**, leading to impaired platelet adhesion and often **thrombocytopenia** with unusually large platelets.
- The patient had a **normal platelet count** and a subsequent prolonged PTT, which points away from a primary platelet adhesion defect.
*Thrombotic thrombocytopenic purpura*
- This is a microangiopathic hemolytic anemia characterized by a **pentad of symptoms**: fever, neurologic symptoms, renal dysfunction, thrombocytopenia, and microangiopathic hemolytic anemia.
- It involves widespread **thrombosis** and **low platelet count**, which does not align with the patient's presentation of massive bleeding with normal platelet counts.
*Glanzmann thrombasthenia*
- This is a rare **platelet aggregation disorder** caused by a defect in **glycoprotein IIb/IIIa**, leading to impaired fibrinogen binding and platelet aggregation.
- While it causes severe bleeding, it would be associated with a **prolonged bleeding time** and normal PTT, which contradicts the patient's normal bleeding time and prolonged PTT.
Postoperative bleeding US Medical PG Question 3: A 71-year-old woman is brought to the emergency department following a syncopal episode. Earlier in the day, the patient had multiple bowel movements that filled the toilet bowl with copious amounts of bright red blood. Minutes later, she felt dizzy and lightheaded and collapsed into her daughter's arms. The patient has a medical history of diabetes mellitus and hypertension. Her temperature is 99.0°F (37.2°C), blood pressure is 155/94 mmHg, pulse is 82/min, respirations are 15/min, and oxygen saturation is 99% on room air. The patient's exam is notable for fecal occult blood positivity on rectal exam; however, the patient is no longer having bloody bowel movements. The patient's lungs are clear to auscultation and her abdomen is soft and nontender. Labs are ordered as seen below.
Hemoglobin: 7.1 g/dL
Hematocrit: 25%
Leukocyte count: 5,300/mm^3 with normal differential
Platelet count: 182,500/mm^3
Two large bore IV's are placed and the patient is given normal saline. What is the best next step in management?
- A. Packed red blood cells
- B. Type and screen (Correct Answer)
- C. Fresh frozen plasma
- D. CT abdomen
- E. Colonoscopy
Postoperative bleeding Explanation: ***Type and screen***
- The patient has experienced a **significant colonic bleed** with associated **syncopal episode** and a **hemoglobin drop** to 7.1 g/dL. Before administering blood products, **blood typing and cross-matching** must be performed to ensure compatibility.
- This step is critical for **patient safety** to prevent transfusion reactions, especially given the likelihood of needing a transfusion soon.
- In the **sequence of acute blood loss management**, type and screen must be completed **before** packed red blood cells can be safely administered, making it the immediate next step after initial resuscitation with IV fluids.
*Packed red blood cells*
- While the patient will likely need **packed red blood cells (PRBCs)** due to severe anemia (Hb 7.1 g/dL) and hemodynamic instability (syncopal episode), PRBCs cannot be administered safely without first performing a **type and screen** to ensure compatibility.
- Administering PRBCs before compatibility testing is generally reserved for **life-threatening emergencies** with ongoing massive hemorrhage where there is no time for even an immediate cross-match (in which case O-negative blood would be used).
- This patient, while anemic, is currently **hemodynamically stable** (normal BP and pulse), allowing time for proper type and screen.
*Fresh frozen plasma*
- **Fresh frozen plasma (FFP)** is used to replace clotting factors in patients with **coagulopathies** or significant bleeding, often observed in massive transfusions or liver disease.
- This patient's **platelet count is normal** and there is no information to suggest a coagulopathy, thus FFP is not indicated as the immediate next step.
*CT abdomen*
- A **CT scan of the abdomen** may be useful later to identify the cause of the lower GI bleed, such as diverticulosis or angiodysplasia.
- However, the immediate priority is to **stabilize the patient hemodynamically** and address the acute blood loss before pursuing diagnostic imaging.
*Colonoscopy*
- A **colonoscopy** is the definitive diagnostic and potentially therapeutic procedure for a lower GI bleed.
- However, before performing a colonoscopy, the patient must be **hemodynamically stable**, which includes addressing their **anemia** and ensuring adequate blood product availability.
Postoperative bleeding US Medical PG Question 4: A 12-year-old boy is brought to the emergency department after a motor vehicle collision. He was being carpooled to school by an intoxicated driver and was involved in a high velocity head-on collision. The patient is otherwise healthy and has no past medical history. His temperature is 99.2°F (37.3°C), blood pressure is 80/45 mmHg, pulse is 172/min, respirations are 36/min, and oxygen saturation is 100% on room air. A FAST exam demonstrates free fluid in Morrison pouch. The patient’s parents arrive and state that they are Jehovah’s witnesses. They state they will not accept blood products for their son but will allow him to go to the operating room to stop the bleeding. Due to poor understanding and a language barrier, the parents are also refusing IV fluids as they are concerned that this may violate their religion. The child is able to verbalize that he agrees with his parents and does not want any treatment. Which of the following is the best next treatment for this patient?
- A. Observation and monitoring and obtain a translator
- B. IV fluids alone as surgery is too dangerous without blood product stabilization
- C. IV fluids and emergency surgery
- D. IV fluids and vasopressors followed by emergency surgery
- E. Blood products and emergency surgery (Correct Answer)
Postoperative bleeding Explanation: ***Blood products and emergency surgery***
- The patient is a **minor** with a **life-threatening injury** (hypotension, tachycardia, free fluid in Morrison's pouch indicating internal bleeding) and requires immediate intervention. In such cases, the state's interest in protecting the life of a child generally **overrides parental religious objections** to life-saving treatment, including blood transfusions.
- **Emergency surgery** is necessary to stop the bleeding, and **blood products** are crucial for stabilizing the patient's hemodynamic status and preventing irreversible shock and death, especially given his severe hypotension and tachycardia.
- Note: **IV fluids would also be administered** as part of standard trauma resuscitation protocol alongside blood products. The key ethical and medical issue here is the authorization to give **blood products** despite parental refusal, which is legally and ethically justified in life-threatening situations involving minors.
*Observation and monitoring and obtain a translator*
- This option is inappropriate as the patient is **hemodynamically unstable** and showing signs of severe hemorrhage, requiring immediate, not delayed, intervention.
- While a translator is important for communication, obtaining one should happen concurrently with life-saving treatment, not as an initial, sole intervention for an unstable patient.
*IV fluids alone as surgery is too dangerous without blood product stabilization*
- The patient requires both **IV fluids for resuscitation** and **surgery to definitively stop internal bleeding**; focusing on fluids alone without addressing the source of hemorrhage will not resolve the critical condition.
- Delaying surgery because of concerns about blood products is dangerous, as the patient might continue to bleed internally and decompensate further, highlighting the need for both interventions simultaneously.
*IV fluids and emergency surgery*
- Although IV fluids and emergency surgery are necessary, this patient is in **hemorrhagic shock** and will almost certainly require **blood products** to survive the surgery and subsequent recovery.
- This option fails to address the **central ethical dilemma**: whether to override parental religious objections to administer life-saving blood products to a minor. Proceeding with surgery without blood products in this scenario significantly increases the risk of mortality.
*IV fluids and vasopressors followed by emergency surgery*
- **Vasopressors** are generally used in distributive shock or when fluid resuscitation has failed, and they can worsen organ perfusion in severe hemorrhagic shock by increasing afterload without addressing the volume deficit.
- While **IV fluids** and **emergency surgery** are critical, the patient's severe bleeding likely warrants **blood products** in addition to fluids to adequately replace lost volume and improve oxygen-carrying capacity.
Postoperative bleeding US Medical PG Question 5: A 38-year-old male is brought to the emergency department by ambulance after a motor vehicle collision. He is found to have a broken femur and multiple soft tissue injuries and is admitted to the hospital. During the hospital course, he is found to have lower extremity swelling, redness, and pain, so he is given an infusion of a medication. The intravenous medication is discontinued in favor of an oral medication in preparation for discharge; however, the patient leaves against medical advice prior to receiving the full set of instructions. The next day, the patient is found to have black lesions on his trunk and his leg. The protein involved in this patient's underlying abnormality most likely affects the function of which of the following factors?
- A. Factor II only
- B. Factors II, VII, IX, and X
- C. Factors II and X
- D. Factors V and VIII (Correct Answer)
- E. Factor V only
Postoperative bleeding Explanation: ***Factors V and VIII***
- The patient's initial presentation of **lower extremity swelling, redness, and pain** after trauma and immobilization is highly suggestive of **deep vein thrombosis (DVT)**, for which he received IV anticoagulation. The subsequent development of **black lesions on his trunk and leg** after switching to an oral anticoagulant and leaving against medical advice points to **warfarin-induced skin necrosis (WISN)**.
- **Warfarin-induced skin necrosis** develops in patients with a congenital deficiency of **protein C** or, less commonly, **protein S**. Protein C, in its activated form (APC), functions to inactivate **Factor V (Va)** and **Factor VIII (VIIIa)**, which are crucial cofactors in the coagulation cascade. A deficiency means these factors remain active, leading to a **procoagulant state**.
*Factor II only*
- **Factor II (prothrombin)** is inactivated by protein C, but a deficiency in protein C primarily affects the inactivation of **Factors V and VIII**, which are the specific targets of activated protein C.
- While factor II is part of the coagulation cascade, its regulation is not the primary mechanism by which protein C deficiency leads to the hypercoagulable state seen in WISN.
*Factors II, VII, IX, and X*
- These factors are **vitamin K-dependent coagulation factors**, which are inhibited by warfarin. While a deficiency in protein C can lead to an initial hypercoagulable state when warfarin is started (due to the faster drop in protein C levels compared to these factors), the primary function of protein C is to inactivate **Factors V and VIII**.
- The problem described is a **protein C deficiency**, which specifically impacts the inactivation of factors V and VIII, not directly these other vitamin K-dependent factors.
*Factors II and X*
- Similar to Factor II only, these are **vitamin K-dependent factors** inhibited by warfarin. The core issue in warfarin-induced skin necrosis is a deficiency in protein C, which normally inactivates **Factors V and VIII**, leading to a transient prothrombotic state.
- While Factor X is affected by warfarin, the direct regulatory role of protein C is predominantly on factors V and VIII.
*Factor V only*
- While **Factor V** is indeed a target of activated protein C inactivation, **Factor VIII** is also a critical target. Inactivating both **Factor V** and **Factor VIII** is essential for effective anticoagulation by protein C.
- A deficiency in protein C affects both of these crucial cofactors, making the combined option more accurate.
Postoperative bleeding US Medical PG Question 6: A 22-year-old woman in the intensive care unit has had persistent oozing from the margins of wounds for 2 hours that is not controlled by pressure bandages. She was admitted to the hospital 13 hours ago following a high-speed motor vehicle collision. Initial focused assessment with sonography for trauma was negative. An x-ray survey showed opacification of the right lung field and fractures of multiple ribs, the tibia, fibula, calcaneus, right acetabulum, and bilateral pubic rami. Laboratory studies showed a hemoglobin concentration of 14.8 g/dL, leukocyte count of 10,300/mm3, platelet count of 175,000/mm3, and blood glucose concentration of 77 mg/dL. Infusion of 0.9% saline was begun. Multiple lacerations on the forehead and extremities were sutured, and fractures were stabilized. Repeat laboratory studies now show a hemoglobin concentration of 12.4 g/dL, platelet count of 102,000/mm3, prothrombin time of 26 seconds (INR=1.8), and activated partial thromboplastin time of 63 seconds. Which of the following is the next best step in management?
- A. Transfuse packed RBC
- B. Transfuse packed RBC and fresh frozen plasma in a 1:1 ratio
- C. Transfuse fresh frozen plasma and platelet concentrate in a 1:1 ratio
- D. Transfuse whole blood and administer vitamin K
- E. Transfuse packed RBC, fresh frozen plasma, and platelet concentrate in a 1:1:1 ratio (Correct Answer)
Postoperative bleeding Explanation: ***Transfuse packed RBC, fresh frozen plasma, and platelet concentrate in a 1:1:1 ratio***
- The patient exhibits signs of **massive hemorrhage and coagulopathy** (persistent oozing, decreasing hemoglobin, prolonged PT and aPTT, decreasing platelets) following severe trauma.
- A **1:1:1 ratio transfusion** of packed red blood cells (RBCs), fresh frozen plasma (FFP), and platelet concentrate is the recommended **massive transfusion protocol** to address hypovolemia, anemia, and consumptive coagulopathy simultaneously.
*Transfuse packed RBC*
- While the patient is anemic (Hb dropped from 14.8 to 12.4 g/dL), transfusing only RBCs would not address the significant **coagulopathy** evidenced by prolonged PT/aPTT and decreasing platelets.
- This option would correct **hypovolemia and oxygen-carrying capacity** but fail to resolve the underlying bleeding disorder, potentially worsening hemorrhage.
*Transfuse packed RBC and fresh frozen plasma in a 1:1 ratio*
- This approach addresses **anemia and coagulopathy** by providing clotting factors, but it neglects the patient's **thrombocytopenia** (platelets dropped from 175,000 to 102,000/mm3 with ongoing bleeding).
- Platelet transfusion is crucial for **hemostasis**, especially in uncontrolled traumatic bleeding.
*Transfuse fresh frozen plasma and platelet concentrate in a 1:1 ratio*
- This option targets **coagulopathy and thrombocytopenia** but completely ignores the significant **anemia and hypovolemia** (Hb 12.4 g/dL with ongoing bleeding) that is likely contributing to hypoperfusion.
- **RBCs** are essential to restore oxygen delivery to tissues and manage hemorrhagic shock.
*Transfuse whole blood and administer vitamin K*
- **Whole blood** is rarely used in civilian trauma settings due to practical limitations, and its components can be provided separately.
- **Vitamin K** is primarily used for warfarin reversal or vitamin K deficiency, which is not the acute cause of coagulopathy in severe trauma; the issue is **dilutional and consumptive coagulopathy**.
Postoperative bleeding US Medical PG Question 7: A 27-year-old man is brought to the emergency department by emergency medical services. The patient was an unrestrained passenger in a head-on collision that occurred 15 minutes ago and is currently unresponsive. His temperature is 99.5°F (37.5°C), blood pressure is 60/33 mmHg, pulse is 180/min, respirations are 17/min, and oxygen saturation is 95% on room air. A FAST exam demonstrates fluid in Morrison’s pouch. Laboratory values are drawn upon presentation to the ED and sent off. The patient is started on IV fluids and an initial trauma survey is started. Twenty minutes later, his blood pressure is 95/65 mmHg, and his pulse is 110/min. The patient is further stabilized and is scheduled for emergency surgery. Which of the following best represents this patient’s most likely initial laboratory values?
- A. Hemoglobin: 10 g/dL, Hematocrit: 30%, MCV: 110 µm^3
- B. Hemoglobin: 19 g/dL, Hematocrit: 55%, MCV: 95 µm^3
- C. Hemoglobin: 7 g/dL, Hematocrit: 21%, MCV: 75 µm^3
- D. Hemoglobin: 11 g/dL, Hematocrit: 33%, MCV: 88 µm^3 (Correct Answer)
- E. Hemoglobin: 15 g/dL, Hematocrit: 45%, MCV: 90 µm^3
Postoperative bleeding Explanation: ***Hemoglobin: 11 g/dL, Hematocrit: 33%, MCV: 88 µm^3***
- The patient experienced significant trauma and is experiencing **hemorrhagic shock**, as evidenced by his initial **hypotension** (BP 60/33 mmHg), **tachycardia** (pulse 180/min), and positive **FAST exam** for fluid in Morrison's pouch, indicating intra-abdominal bleeding.
- The initial hemoglobin and hematocrit could be mildly decreased due to acute blood loss, but significant drops are often *not immediately apparent* as plasma volume has not yet moved into the intravascular compartment to dilute the remaining red blood cells. A hemoglobin of 11 g/dL and hematocrit of 33% are consistent with **acute blood loss** before significant hemodilution occurs. MCV of 88 µm^3 is within the normal range for **normocytic anemia** seen in acute hemorrhage.
*Hemoglobin: 10 g/dL, Hematocrit: 30%, MCV: 110 µm^3*
- While a hemoglobin of 10 g/dL and hematocrit of 30% are consistent with anemia due to blood loss, an **MCV of 110 µm^3** (macrocytic) is not typically seen in acute hemorrhage.
- Macrocytic anemia usually results from conditions like **B12 or folate deficiency**, alcoholism, or liver disease, which are not suggested by the acute traumatic scenario.
*Hemoglobin: 19 g/dL, Hematocrit: 55%, MCV: 95 µm^3*
- This indicates **polycythemia** (abnormally high red blood cell count), which is the opposite of what would be expected in a patient experiencing acute hemorrhagic shock.
- These values would suggest conditions like **polycythemia vera** or severe dehydration, which are not relevant in this acute trauma setting.
*Hemoglobin: 7 g/dL, Hematocrit: 21%, MCV: 75 µm^3*
- While a hemoglobin of 7 g/dL and hematocrit of 21% represent significant anemia consistent with major blood loss, these values are typically seen *later* as **hemodilution** occurs, or in cases of chronic blood loss.
- An **MCV of 75 µm^3** (microcytic) is generally indicative of **iron deficiency anemia** or thalassemia, which develops over time and is not characteristic of acute traumatic blood loss.
*Hemoglobin: 15 g/dL, Hematocrit: 45%, MCV: 90 µm^3*
- These values are within the **normal range** for hemoglobin and hematocrit, which would not be expected in a patient presenting with signs of **hemorrhagic shock** and a positive FAST exam indicating significant internal bleeding.
- This would suggest either very minor blood loss or that the values were taken before any bleeding had occurred or before hemodilution had a chance to manifest.
Postoperative bleeding US Medical PG Question 8: Two hours after undergoing a left femoral artery embolectomy, an obese 63-year-old woman has severe pain, numbness, and tingling of the left leg. The surgery was without complication and peripheral pulses were weakly palpable postprocedure. She has type 2 diabetes mellitus, peripheral artery disease, hypertension, and hypercholesterolemia. Prior to admission, her medications included insulin, enalapril, carvedilol, aspirin, and rosuvastatin. She appears uncomfortable. Her temperature is 37.1°C (99.3°F), pulse is 98/min, and blood pressure is 132/90 mm Hg. Examination shows a left groin surgical incision. The left lower extremity is swollen, stiff, and tender on palpation. Dorsiflexion of her left foot causes severe pain in her calf. Femoral pulses are palpated bilaterally. Pedal pulses are weaker on the left side as compared to the right side. Laboratory studies show:
Hemoglobin 12.1
Leukocyte count 11,300/mm3
Platelet count 189,000/mm3
Serum
Glucose 222 mg/dL
Creatinine 1.1 mg/dL
Urinalysis is within normal limits. Which of the following is the most likely cause of these findings?
- A. Reperfusion injury (Correct Answer)
- B. Cellulitis
- C. Cholesterol embolism
- D. Deep vein thrombosis
- E. Rhabdomyolysis
Postoperative bleeding Explanation: ***Reperfusion injury***
- The patient's symptoms of **severe pain, numbness, and tingling** in the left leg following an embolectomy, along with **swelling, stiffness, and tenderness** of the extremity, and pain on passive dorsiflexion (**pain with passive stretch**), are classic signs of **acute compartment syndrome**.
- In this context, compartment syndrome is caused by **reperfusion injury** following prolonged limb ischemia. When blood flow is restored after prolonged ischemia, the reperfusion causes **oxidative stress, inflammatory mediator release, and increased capillary permeability**, leading to **tissue edema and elevated intracompartmental pressure** that compresses nerves and vessels.
- The **2-hour timeline** post-embolectomy and the clinical triad of pain out of proportion, pain with passive stretch, and paresthesias make reperfusion injury leading to compartment syndrome the most likely diagnosis.
*Cellulitis*
- While cellulitis causes **pain, swelling, and redness**, it typically has a more **gradual onset** and is associated with warmth, erythema, and signs of infection.
- The **acute onset** (2 hours post-surgery), **severe neurologic symptoms** (numbness, tingling), and **pain with passive stretch** are not characteristic of cellulitis.
- The absence of fever, significant leukocytosis, or spreading erythema makes cellulitis unlikely.
*Cholesterol embolism*
- **Cholesterol emboli** can occur after vascular procedures and typically present with **livedo reticularis**, **"blue toe" syndrome**, **renal impairment**, or **eosinophilia**.
- While possible after arterial manipulation, the acute presentation with signs of **elevated compartment pressure** (pain with passive stretch, swelling, paresthesias) points to a pressure-related compartment issue rather than distal microembolization.
*Deep vein thrombosis*
- **DVT** causes **unilateral leg swelling, pain, and tenderness** but typically presents with a more **gradual onset** over hours to days.
- DVT would not explain the **acute severe pain with passive stretch**, **rapid neurologic symptoms** (paresthesias), or the **compartment syndrome findings** seen immediately (2 hours) post-procedure.
- The clinical picture of acute compartment syndrome better fits ischemia-reperfusion injury.
*Rhabdomyolysis*
- **Rhabdomyolysis** involves muscle breakdown due to prolonged ischemia or trauma and is characterized by **elevated creatinine kinase (CK)**, **myoglobinuria**, and potentially **acute kidney injury**.
- While rhabdomyolysis can occur **secondary to** both the initial ischemia and subsequent compartment syndrome, it is a **consequence or complication** rather than the **primary cause** of the acute compartment syndrome findings.
- The immediate clinical presentation (severe pain with passive stretch, paresthesias, swelling) reflects **elevated intracompartmental pressure from reperfusion injury**, not rhabdomyolysis itself.
Postoperative bleeding US Medical PG Question 9: Three days after undergoing coronary artery bypass surgery, a 72-year-old man has severe right upper quadrant pain, fever, nausea, and vomiting. He has type 2 diabetes mellitus, benign prostatic hyperplasia, peripheral vascular disease, and chronic mesenteric ischemia. He had smoked one pack of cigarettes daily for 30 years but quit 10 years ago. He drinks 8 cans of beer a week. His preoperative medications include metformin, aspirin, simvastatin, and finasteride. His temperature is 38.9°C (102°F), pulse is 102/min, respirations are 18/min, and blood pressure is 110/60 mmHg. Auscultation of the lungs shows bilateral inspiratory crackles. Cardiac examination shows no murmurs, rubs or gallops. Abdominal examination shows soft abdomen with tenderness and sudden inspiratory arrest upon palpation in the right upper quadrant. There is no rebound tenderness or guarding. Laboratory studies show the following:
Hemoglobin 13.1 g/dL
Hematocrit 42%
Leukocyte count 15,700/mm3
Segmented neutrophils 65%
Bands 10%
Lymphocytes 20%
Monocytes 3%
Eosinophils 1%
Basophils 0.5%
AST 40 U/L
ALT 100 U/L
Alkaline phosphatase 85 U/L
Total bilirubin 1.5 mg/dL
Direct 0.9 mg/dL
Amylase 90 U/L
Abdominal ultrasonography shows a distended gallbladder, thickened gallbladder wall with pericholecystic fluid, and no stones. Which of the following is the most appropriate next step in management?
- A. Intravenous heparin therapy followed by embolectomy
- B. Careful observation with serial abdominal examinations
- C. Endoscopic retrograde cholangiopancreatography with papillotomy
- D. Intravenous piperacillin-tazobactam therapy and percutaneous cholecystostomy (Correct Answer)
- E. Immediate cholecystectomy
Postoperative bleeding Explanation: ***Intravenous piperacillin-tazobactam therapy and percutaneous cholecystostomy***
- The patient presents with **acalculous cholecystitis**, characterized by severe RUQ pain, fever, leukocytosis, elevated transaminases, and ultrasonographic findings of a distended gallbladder with a thickened wall and pericholecystic fluid, but no stones.
- Given his comorbid conditions (diabetes, PVD, recent CABG) and the severity of his illness, empirical **broad-spectrum antibiotics** (like piperacillin-tazobactam) along with image-guided **percutaneous cholecystostomy** for gallbladder decompression are the most appropriate management, avoiding the high risks of immediate surgery.
*Intravenous heparin therapy followed by embolectomy*
- This approach is indicated for **acute mesenteric ischemia with embolism**, which can present with severe abdominal pain and signs of hypoperfusion.
- While the patient has chronic mesenteric ischemia, his current symptoms and imaging findings are more consistent with cholecystitis, and there is no clear evidence of acute embolic event requiring embolectomy.
*Careful observation with serial abdominal examinations*
- This patient exhibits signs of a severe inflammatory process (fever, leukocytosis, RUQ tenderness, elevated LFTs, and sonographic findings of severe inflammation) and systemic illness, making **conservative observation insufficient** and potentially dangerous.
- **Acalculous cholecystitis** is a serious condition with a high risk of complications like perforation and sepsis, especially in critically ill patients, and requires prompt intervention.
*Endoscopic retrograde cholangiopancreatography with papillotomy*
- **ERCP with papillotomy** is indicated for conditions like **choledocholithiasis** (common bile duct stones) or **cholangitis**, which cause biliary obstruction.
- The ultrasound shows **no stones** and features specific to cholecystitis rather than common bile duct obstruction, making ERCP inappropriate as an initial step.
*Immediate cholecystectomy*
- While cholecystectomy is the definitive treatment for cholecystitis, immediate open or laparoscopic cholecystectomy in a critically ill patient with **acalculous cholecystitis** after recent CABG carries a **very high morbidity and mortality risk**.
- **Percutaneous cholecystostomy** offers a safer, less invasive alternative for source control and stabilizes the patient before potential delayed definitive surgery if needed, once the patient's condition improves.
Postoperative bleeding US Medical PG Question 10: A 31-year-old woman is brought to the emergency department 25 minutes after sustaining a gunshot wound to the neck. She did not lose consciousness. On arrival, she has severe neck pain. She appears anxious. Her temperature is 37°C (98.6°F), pulse is 105/min, respirations are 25/min, and blood pressure is 100/70 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 96%. She is oriented to person, place, and time. Examination shows a bullet entrance wound in the right posterior cervical region of the neck. There is no exit wound. Carotid pulses are palpable bilaterally. There are no carotid bruits. Sensation to pinprick and light touch is normal. The lungs are clear to auscultation. Cardiac examination shows no murmurs, rubs, or gallops. In addition to intravenous fluid resuscitation, which of the following is the most appropriate next step in the management of this patient?
- A. Laryngoscopy
- B. Surgical exploration
- C. Barium swallow
- D. CT angiography (Correct Answer)
- E. Esophagoscopy
Postoperative bleeding Explanation: ***CT angiography***
- This patient has a **penetrating neck injury** with significant concern for vascular compromise given the mechanism (gunshot wound) and location (posterior cervical region).
- **CT angiography** is the most appropriate initial imaging study to evaluate for **vascular injury** (e.g., artery dissection, pseudoaneurysm, active bleeding) and often provides information about potential airway or esophageal damage.
*Laryngoscopy*
- While airway injury is a concern with neck trauma, this patient has a **stable airway** (oxygen saturation 96%, no stridor, clear lungs).
- Laryngoscopy is more indicated for direct evaluation of the **larynx and pharynx** if there are signs of airway compromise or difficulty breathing.
*Surgical exploration*
- **Surgical exploration** is typically reserved for patients with clear signs of **hemodynamic instability** or definitive evidence of significant injury (e.g., expanding hematoma, pulsatile bleeding) after initial imaging.
- Given the patient's relative stability, a less invasive diagnostic approach is warranted first.
*Barium swallow*
- A **barium swallow** (esophagography) is used to evaluate for **esophageal injury**.
- While esophageal damage is possible with a gunshot wound to the neck, CTA can often provide indirect evidence and is generally performed first due to the higher index of suspicion for vascular injury.
*Esophagoscopy*
- **Esophagoscopy** is a more invasive procedure for directly visualizing the esophagus.
- It would be considered if there is suspicion for esophageal injury, especially after initial imaging, but **CTA is preferred first** for broader assessment of vascular and other structures.
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