A 56-year-old man is brought to the emergency department 25 minutes after he was involved in a high-speed motor vehicle collision where he was the unrestrained passenger. He has severe lower abdominal and pelvic pain. On arrival, he is alert and oriented. His pulse is 95/min, respirations are 22/min, and blood pressure is 106/62 mm Hg. Examination shows severe tenderness to palpation over the lower abdomen and over the left anterior superior iliac spine. There is no limb length discrepancy. Application of downward pressure over the pelvis shows no springy resistance or instability. Rectal examination is unremarkable. A focused assessment with sonography shows no free fluid in the abdomen. There is no blood at the urethral meatus. Placement of a Foley catheter shows gross hematuria. An x-ray of the pelvis shows a fracture of the left pelvic edge. Which of the following is the most appropriate next step in management?
Q2
A 41-year-old man is admitted to the emergency room after being struck in the abdomen by a large cement plate while transporting it. On initial assessment by paramedics at the scene, his blood pressure was 110/80 mm Hg, heart rate 85/min, with no signs of respiratory distress. On admission, the patient is alert but in distress. He complains of severe, diffuse, abdominal pain and severe weakness. Vital signs are now: blood pressure 90/50 mm Hg, heart rate 96/min, respiratory rate 19/min, temperature 37.4℃ (99.3℉), and oxygen saturation of 95% on room air. His lungs are clear on auscultation. The cardiac exam is significant for a narrow pulse pressure. Abdominal examination reveals a large bruise over the epigastric and periumbilical regions. The abdomen is distended and there is diffuse tenderness to palpation with rebound and guarding, worst in the epigastric region. There is hyperresonance to percussion in the epigastric region and absence of hepatic dullness in the right upper quadrant. Aspiration of the nasogastric tube reveals bloody contents. Focused assessment with sonography for trauma (FAST) shows free fluid in the pelvic region. Evaluation of the perisplenic and perihepatic regions is impossible due to the presence of free air. Aggressive intravenous fluid resuscitation is administered but fails to improve upon the patient’s hemodynamics. Which of the following is the next best step in management?
Q3
A 25-year-old man comes to the physician for severe back pain. He describes the pain as shooting and stabbing. On a 10-point scale, he rates the pain as a 9 to 10. The pain started after he lifted a heavy box at work; he works at a supermarket and recently switched from being a cashier to a storekeeper. The patient appears to be in severe distress. Vital signs are within normal limits. On physical examination, the spine is nontender without paravertebral muscle spasms. Range of motion is normal. A straight-leg raise test is negative. After the physical examination has been completed, the patient asks for a letter to his employer attesting to his inability to work as a storekeeper. Which of the following is the most appropriate response?
Q4
You are a resident on a pediatric service entering orders late at night. Upon arrival the next morning, you note that you had mistakenly ordered that low molecular weight heparin be administered to a 17-year-old patient who does not need anti-coagulation. When you talk to her, she complains about the "shot" she had to get this morning but is otherwise well. How should you handle the situation?
Q5
A 28-year-old woman dies shortly after receiving a blood transfusion. Autopsy reveals widespread intravascular hemolysis and acute renal failure. Investigation reveals that she received type A blood, but her medical record indicates she was type O. In a malpractice lawsuit, which of the following elements must be proven?
Q6
A psychiatrist receives a call from a patient who expresses thoughts of harming his ex-girlfriend. The patient describes a detailed plan to attack her at her workplace. Which of the following represents the psychiatrist's most appropriate legal obligation?
Q7
A 38-year-old woman undergoes hemithyroidectomy for treatment of localized, well-differentiated papillary thyroid carcinoma. The lesion is removed with clear margins. However, during the surgery, a structure lying directly adjacent to the superior thyroid artery at the upper pole of the thyroid lobe is damaged. This patient is most likely to experience which of the following symptoms?
Q8
A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
Q9
A 53-year-old multiparous woman is scheduled to undergo elective sling surgery for treatment of stress incontinence. She has frequent loss of small amounts of urine when she coughs or laughs, despite attempts at conservative treatment. The physician inserts trocars in the obturator foramen bilaterally to make the incision and passes a mesh around the pubic bones and underneath the urethra to form a sling. During the procedure, the physician accidentally injures a nerve in the obturator foramen. The function of which of the following muscles is most likely to be affected following the procedure?
Q10
A 45-year-old man is brought to the trauma bay by emergency services after a motorbike accident in which the patient, who was not wearing a helmet, hit a pole of a streetlight with his head. When initially evaluated by the paramedics, the patient was responsive, albeit confused, opened his eyes spontaneously, and was able to follow commands. An hour later, upon admission, the patient only opened his eyes to painful stimuli, made incomprehensible sounds, and assumed a flexed posture. The vital signs are as follows: blood pressure 140/80 mm Hg; heart rate 59/min; respiratory rate 11/min; temperature 37.0℃ (99.1℉), and SaO2, 95% on room air. The examination shows a laceration and bruising on the left side of the head. There is anisocoria with the left pupil 3 mm more dilated than the right. Both pupils react sluggishly to light. There is an increase in tone and hyperreflexia in the right upper and lower extremities. The patient is intubated and mechanically ventilated, head elevated to 30°, and sent for a CT scan. Which of the following management strategies should be used in this patient, considering his most probable diagnosis?
Iatrogenic injuries US Medical PG Practice Questions and MCQs
Question 1: A 56-year-old man is brought to the emergency department 25 minutes after he was involved in a high-speed motor vehicle collision where he was the unrestrained passenger. He has severe lower abdominal and pelvic pain. On arrival, he is alert and oriented. His pulse is 95/min, respirations are 22/min, and blood pressure is 106/62 mm Hg. Examination shows severe tenderness to palpation over the lower abdomen and over the left anterior superior iliac spine. There is no limb length discrepancy. Application of downward pressure over the pelvis shows no springy resistance or instability. Rectal examination is unremarkable. A focused assessment with sonography shows no free fluid in the abdomen. There is no blood at the urethral meatus. Placement of a Foley catheter shows gross hematuria. An x-ray of the pelvis shows a fracture of the left pelvic edge. Which of the following is the most appropriate next step in management?
A. Intravenous pyelography
B. External fixation of the pelvis
C. Cystoscopy
D. Retrograde urethrography
E. Retrograde cystography (Correct Answer)
Explanation: ***Retrograde cystography***
- The presence of **gross hematuria** in a patient with a **pelvic fracture** necessitates ruling out **bladder injury**. A retrograde cystography directly visualizes the bladder and can detect extravasation of contrast if a bladder rupture is present.
- This imaging study specifically investigates the bladder using retrograde contrast filling, which is crucial for diagnosing **intraperitoneal** or **extraperitoneal bladder rupture**.
*Intravenous pyelography*
- This study evaluates the **kidneys** and **ureters** for injury, but the primary concern with gross hematuria and pelvic fracture is the bladder.
- An IV pyelogram provides less detailed imaging of the bladder compared to a retrograde cystogram and is less effective for detecting bladder rupture.
*External fixation of the pelvis*
- While the patient has a pelvic fracture, the immediate priority in a hemodynamically stable patient with gross hematuria is to identify and manage potential **life-threatening urologic injuries** before definitive orthopedic repair.
- **Pelvic external fixation** is primarily indicated for **unstable pelvic fractures** or those causing significant hemorrhage, neither of which is explicitly described as an immediate concern requiring intervention before urologic evaluation.
*Cystoscopy*
- **Cystoscopy** is an endoscopic procedure that allows direct visualization of the bladder's interior. While it can identify bladder injuries, it is generally considered after imaging studies like **retrograde cystography** to confirm findings or address specific issues like clot evacuation or stent placement.
- The initial diagnostic step should focus on assessing for rupture via contrast study, which is often less invasive than a direct endoscopic procedure in the acute trauma setting.
*Retrograde urethrography*
- **Retrograde urethrography (RUG)** is used to evaluate for **urethral injury**, especially when there is blood at the urethral meatus, a high-riding prostate, or an inability to pass a Foley catheter.
- The patient's Foley catheter was successfully placed, and there was **no blood at the urethral meatus**, making urethral injury less likely and thus RUG a lower priority as the initial step compared to assessing for bladder injury.
Question 2: A 41-year-old man is admitted to the emergency room after being struck in the abdomen by a large cement plate while transporting it. On initial assessment by paramedics at the scene, his blood pressure was 110/80 mm Hg, heart rate 85/min, with no signs of respiratory distress. On admission, the patient is alert but in distress. He complains of severe, diffuse, abdominal pain and severe weakness. Vital signs are now: blood pressure 90/50 mm Hg, heart rate 96/min, respiratory rate 19/min, temperature 37.4℃ (99.3℉), and oxygen saturation of 95% on room air. His lungs are clear on auscultation. The cardiac exam is significant for a narrow pulse pressure. Abdominal examination reveals a large bruise over the epigastric and periumbilical regions. The abdomen is distended and there is diffuse tenderness to palpation with rebound and guarding, worst in the epigastric region. There is hyperresonance to percussion in the epigastric region and absence of hepatic dullness in the right upper quadrant. Aspiration of the nasogastric tube reveals bloody contents. Focused assessment with sonography for trauma (FAST) shows free fluid in the pelvic region. Evaluation of the perisplenic and perihepatic regions is impossible due to the presence of free air. Aggressive intravenous fluid resuscitation is administered but fails to improve upon the patient’s hemodynamics. Which of the following is the next best step in management?
A. Emergency laparoscopy
B. Abdominal ultrasound
C. Diagnostic peritoneal lavage (DPL)
D. Emergency laparotomy (Correct Answer)
E. CT scan
Explanation: ***Emergency laparotomy***
- The patient presents with **hemodynamic instability** unresponsive to fluid resuscitation, coupled with clear signs of **perforation** (hyperresonance, absent hepatic dullness, free air on FAST limited view). This clinical picture is a direct indication for immediate surgical intervention.
- The presence of bloody nasogastric tube contents, diffuse tenderness with rebound and guarding, and a history of significant blunt trauma further support the need for urgent exploratory **laparotomy** to identify and repair the source of injury.
*Emergency laparoscopy*
- While laparoscopy can be used for abdominal exploration, it is **contraindicated in hemodynamically unstable patients** due to the need for pneumoperitoneum, which can further compromise cardiovascular stability.
- In cases of suspected visceral perforation with extensive free air and massive bleeding, **laparoscopy may be technically challenging** and less efficient than open laparotomy for rapid control of hemorrhage and contamination.
*Abdominal ultrasound*
- An abdominal ultrasound (**FAST exam**) has already been partially performed, revealing free fluid and raising suspicion of free air, making further ultrasound redundant.
- While useful for initial trauma assessment, an ultrasound **cannot definitively rule out all abdominal injuries**, especially hollow viscus perforations or retroperitoneal hematomas, and is insufficient for unstable patients with clear signs of peritonitis.
*Diagnostic peritoneal lavage (DPL)*
- **DPL is largely replaced by FAST and CT scans** in most trauma centers, especially given the availability of imaging.
- Although it can detect intraperitoneal bleeding or perforation, it is an **invasive procedure** with potential complications and would only confirm what is already strongly suspected clinically; it does not address the need for immediate therapeutic intervention in an unstable patient.
*CT scan*
- A CT scan would be the imaging modality of choice for a **hemodynamically stable** patient with blunt abdominal trauma.
- However, performing a CT scan on an **unstable patient** would unnecessarily delay definitive surgical management, which is critical given the signs of ongoing internal bleeding and likely perforation.
Question 3: A 25-year-old man comes to the physician for severe back pain. He describes the pain as shooting and stabbing. On a 10-point scale, he rates the pain as a 9 to 10. The pain started after he lifted a heavy box at work; he works at a supermarket and recently switched from being a cashier to a storekeeper. The patient appears to be in severe distress. Vital signs are within normal limits. On physical examination, the spine is nontender without paravertebral muscle spasms. Range of motion is normal. A straight-leg raise test is negative. After the physical examination has been completed, the patient asks for a letter to his employer attesting to his inability to work as a storekeeper. Which of the following is the most appropriate response?
A. “Yes. Since work may worsen your condition, I would prefer that you stay home a few days. I will write a letter to your employer to explain the situation.”
B. You say you are in severe pain. However, the physical examination findings do not suggest a physical problem that can be addressed with medications or surgery. I'd like to meet on a regular basis to see how you're doing.
C. I understand that you are uncomfortable, but the findings do not match the severity of your symptoms. Let's talk about the recent changes at your job. (Correct Answer)
D. The physical exam findings do not match your symptoms, which suggests a psychological problem. I would be happy to refer you to a mental health professional.
E. The physical exam findings suggest a psychological rather than a physical problem. But there is a good chance that we can address it with cognitive-behavioral therapy.
Explanation: ***"I understand that you are uncomfortable, but the findings do not match the severity of your symptoms. Let's talk about the recent changes at your job."***
- This response acknowledges the patient's reported discomfort while gently highlighting the **discrepancy between symptoms and objective findings**, which is crucial in cases of suspected **somatoform or functional pain**.
- It also opens communication about potential **psychosocial stressors** related to his job change, which could be contributing to his symptoms, without dismissing his pain or making a premature diagnosis.
*"You say you are in severe pain. However, the physical examination findings do not suggest a physical problem that can be addressed with medications or surgery. I'd like to meet on a regular basis to see how you're doing."*
- While this option correctly identifies the lack of physical findings, it can be perceived as dismissive of the patient's pain, potentially damaging the **physician-patient relationship**.
- Suggesting regular meetings without a clear plan for addressing his immediate concerns or exploring underlying issues might not be the most effective initial approach.
*“Yes. Since work may worsen your condition, I would prefer that you stay home a few days. I will write a letter to your employer to explain the situation.”*
- This response would **validate the patient's claim of severe pain** without objective evidence, potentially reinforcing illness behavior and avoiding addressing the underlying issue.
- Providing a doctor's note for inability to work without a clear diagnostic basis or understanding of the pain's origin is **medically inappropriate** and could set a precedent for future such requests.
*"The physical exam findings do not match your symptoms, which suggests a psychological problem. I would be happy to refer you to a mental health professional."*
- Directly labeling the problem as "psychological" can be **stigmatizing and alienating** to the patient, leading to distrust and resistance to care.
- While a psychological component might be present, immediately referring to mental health without further exploration of the patient's situation or current stressors is premature and lacks empathy.
*"The physical exam findings suggest a psychological rather than a physical problem. But there is a good chance that we can address it with cognitive-behavioral therapy."*
- Similar to the previous option, explicitly stating a "psychological problem" can be **stigmatizing**.
- Jumping directly to recommending **cognitive-behavioral therapy (CBT)** without a comprehensive discussion and patient buy-in is premature and may lead to non-compliance.
Question 4: You are a resident on a pediatric service entering orders late at night. Upon arrival the next morning, you note that you had mistakenly ordered that low molecular weight heparin be administered to a 17-year-old patient who does not need anti-coagulation. When you talk to her, she complains about the "shot" she had to get this morning but is otherwise well. How should you handle the situation?
A. Since there was no lasting harm to the patient, it is not necessary to disclose the error
B. Tell the patient and her parents about the error (Correct Answer)
C. You cannot disclose the error as a resident due to hospital policy
D. Tell the patient, but ask her not to tell her parents
E. Speak to risk management before deciding whether or not to disclose the error
Explanation: ***Tell the patient and her parents about the error***
- Full **disclosure of medical errors** is a fundamental ethical principle, even if no lasting harm occurred, because it promotes trust and transparency.
- As a **minor**, the patient's parents/guardians have the right to be informed about medical errors affecting their child's care and safety.
*Since there was no lasting harm to the patient, it is not necessary to disclose the error*
- This statement is incorrect because the **absence of harm** does not negate the ethical obligation to disclose a medical error; it is crucial for patient trust and learning from mistakes.
- Failing to disclose an error, even if harmless, can erode trust and is considered a breach of **professional integrity and transparency**.
*You cannot disclose the error as a resident due to hospital policy*
- While hospital policies may guide the process of disclosure (e.g., involving attending physicians or risk management), they do not prevent residents from participating in or initiating the disclosure of an error.
- The resident's role involves acknowledging the error and initiating the appropriate steps for disclosure, often in collaboration with their **supervising physician**.
*Tell the patient, but ask her not to tell her parents*
- This is unethical and legally problematic because, as a **minor**, the patient's parents or legal guardians have the right to be informed about significant medical events and errors related to their child's care.
- Asking the patient to withhold information from her parents undermines **parental rights** and creates an inappropriate and potentially harmful dynamic.
*Speak to risk management before deciding whether or not to disclose the error*
- While consulting **risk management** is an important step in the process of disclosing a medical error to ensure compliance and support, it should not be a prerequisite for the decision to disclose.
- The ethical imperative is to disclose the error; risk management primarily guides *how* to best disclose it, not *whether* to disclose it.
Question 5: A 28-year-old woman dies shortly after receiving a blood transfusion. Autopsy reveals widespread intravascular hemolysis and acute renal failure. Investigation reveals that she received type A blood, but her medical record indicates she was type O. In a malpractice lawsuit, which of the following elements must be proven?
A. Duty, breach, causation, and damages (Correct Answer)
B. Only duty and breach
C. Only breach and causation
D. Duty, breach, and damages
Explanation: ***Duty, breach, causation, and damages***
- In a medical malpractice lawsuit, all four elements—**duty, breach, causation, and damages**—must be proven for a successful claim.
- The healthcare provider had a **duty** to provide competent care, they **breached** that duty by administering the wrong blood type, this breach **caused** the patient's death and renal failure, and these injuries constitute **damages**.
*Only duty and breach*
- While **duty** and **breach** are necessary components, proving only these two is insufficient for a malpractice claim.
- It must also be demonstrated that the breach directly led to the patient's harm and resulted in legally recognized damages.
*Only breach and causation*
- This option omits the crucial elements of professional **duty** owed to the patient and the resulting **damages**.
- A claim cannot succeed without establishing that a duty existed and that quantifiable harm occurred.
*Duty, breach, and damages*
- This option misses the critical element of **causation**, which links the provider's breach of duty to the patient's injuries.
- Without proving that the breach *caused* the damages, even if a duty was owed and breached, and damages occurred, the claim would fail.
Question 6: A psychiatrist receives a call from a patient who expresses thoughts of harming his ex-girlfriend. The patient describes a detailed plan to attack her at her workplace. Which of the following represents the psychiatrist's most appropriate legal obligation?
A. Warn the ex-girlfriend and notify law enforcement (Correct Answer)
B. Only notify the patient's family
C. Warn only law enforcement
D. Maintain patient confidentiality
Explanation: ***Warn the ex-girlfriend and notify law enforcement***
- This scenario directly triggers the **"duty to warn"** and **"duty to protect"** principles, primarily stemming from the **Tarasoff v. Regents of the University of California** case.
- The psychiatrist has a legal obligation to take reasonable steps to protect the identifiable victim, which includes directly warning the intended victim and informing law enforcement.
*Only notify the patient's family*
- Notifying the patient's family alone does not fulfill the **legal obligation to protect** an identifiable third party from a serious threat of harm.
- While family involvement might be part of a comprehensive safety plan, it is insufficient as the sole action in this critical situation.
*Warn only law enforcement*
- While notifying law enforcement is a crucial step, the **Tarasoff duty** specifically mandates warning the **intended victim** directly (or those who can reasonably be expected to notify the victim).
- Relying solely on law enforcement might not ensure the immediate safety of the ex-girlfriend, especially if there's a delay in their response or ability to locate her.
*Maintain patient confidentiality*
- Patient confidentiality is a cornerstone of psychiatric practice, but it is **not absolute** when there is a serious and imminent threat of harm to an identifiable individual.
- The **duty to protect** a potential victim *outweighs* the duty to maintain confidentiality in such extreme circumstances.
Question 7: A 38-year-old woman undergoes hemithyroidectomy for treatment of localized, well-differentiated papillary thyroid carcinoma. The lesion is removed with clear margins. However, during the surgery, a structure lying directly adjacent to the superior thyroid artery at the upper pole of the thyroid lobe is damaged. This patient is most likely to experience which of the following symptoms?
A. Shortness of breath
B. Weakness of shoulder shrug
C. Voice pitch limitation (Correct Answer)
D. Difficulty swallowing
E. Ineffective cough
Explanation: ***Voice pitch limitation***
- Damage to the structure directly adjacent to the **superior thyroid artery** at the upper pole of the thyroid likely involves the **external branch of the superior laryngeal nerve (EBSLN)**.
- This nerve innervates the **cricothyroid muscle**, which is responsible for **tensing the vocal cords** and controlling **voice pitch**.
- Injury results in inability to change pitch, voice fatigue during prolonged speaking, and reduced vocal range.
*Shortness of breath*
- While damage to other nerves like the **recurrent laryngeal nerve** could cause vocal cord paralysis and potentially lead to airway compromise, this is less directly associated with the superior thyroid artery.
- Shortness of breath is not the specific consequence of EBSLN injury near the superior thyroid artery.
*Weakness of shoulder shrug*
- Weakness of shoulder shrug is associated with damage to the **spinal accessory nerve (cranial nerve XI)**, which innervates the **trapezius muscle**.
- This nerve is anatomically distinct from structures near the superior thyroid artery at the upper pole of the thyroid.
*Difficulty swallowing*
- Difficulty swallowing (dysphagia) can result from damage to the **vagus nerve (cranial nerve X)** or its pharyngeal branches, but it is not the direct consequence of injury near the superior thyroid artery.
- Damage to the EBSLN primarily affects voice pitch and quality, not swallowing.
*Ineffective cough*
- An ineffective cough results from paralysis of the vocal cords (preventing glottic closure) or weakness of respiratory muscles, typically from **recurrent laryngeal nerve** damage or phrenic nerve injury.
- EBSLN damage primarily affects voice pitch and does not significantly impair cough effectiveness.
Question 8: A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
A. "Does the diarrhea typically precede the constipation, or vice-versa?"
B. "Is the diarrhea foul-smelling?"
C. "Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life"
D. "Are the symptoms worse in the morning or at night?"
E. "Can you tell me more about the symptoms you have been experiencing?" (Correct Answer)
Explanation: ***Can you tell me more about the symptoms you have been experiencing?***
- This **open-ended question** encourages the patient to provide a **comprehensive narrative** of their symptoms, including details about onset, frequency, duration, alleviating/aggravating factors, and associated symptoms, which is crucial for diagnosis.
- In a patient presenting with vague, intermittent symptoms like alternating constipation and diarrhea, allowing them to elaborate freely can reveal important clues that might not be captured by more targeted questions.
*Does the diarrhea typically precede the constipation, or vice-versa?*
- While knowing the sequence of symptoms can be helpful in understanding the **pattern of bowel dysfunction**, it is a very specific question that might overlook other important aspects of the patient's experience.
- It prematurely narrows the focus without first obtaining a broad understanding of the patient's overall symptomatic picture.
*Is the diarrhea foul-smelling?*
- Foul-smelling diarrhea can indicate **malabsorption** or **bacterial overgrowth**, which are important to consider in some gastrointestinal conditions.
- However, this is a **specific symptom inquiry** that should follow a more general exploration of the patient's symptoms, as it may not be relevant if other crucial details are missed.
*Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life*
- Quantifying pain intensity is useful for assessing the **severity of discomfort** and monitoring changes over time.
- However, for a patient with intermittent rather than acute, severe pain, understanding the **character, location, and triggers** of the pain is often more diagnostically valuable than just a numerical rating initially.
*Are the symptoms worse in the morning or at night?*
- Diurnal variation can be relevant in certain conditions, such as inflammatory bowel diseases where nocturnal symptoms might be more concerning, or functional disorders whose symptoms might be stress-related.
- This is another **specific question** that should come after gathering a more complete initial picture of the patient's symptoms to ensure no key information is overlooked.
Question 9: A 53-year-old multiparous woman is scheduled to undergo elective sling surgery for treatment of stress incontinence. She has frequent loss of small amounts of urine when she coughs or laughs, despite attempts at conservative treatment. The physician inserts trocars in the obturator foramen bilaterally to make the incision and passes a mesh around the pubic bones and underneath the urethra to form a sling. During the procedure, the physician accidentally injures a nerve in the obturator foramen. The function of which of the following muscles is most likely to be affected following the procedure?
A. Obturator internus
B. Tensor fascia latae
C. Adductor longus (Correct Answer)
D. Semitendinosus
E. Transversus abdominis
Explanation: ***Adductor longus***
- The **obturator nerve** passes through the obturator foramen and innervates the **adductor muscles** of the thigh, including the **adductor longus**.
- Injury to the obturator nerve would therefore directly affect the function of the adductor longus, leading to impaired thigh adduction.
*Obturator internus*
- The **obturator internus** muscle is innervated by the **nerve to obturator internus**, which arises from the sacral plexus (L5-S2).
- This nerve does not pass through the obturator foramen, making injury to this muscle unlikely in this specific scenario.
*Tensor fascia latae*
- The **tensor fascia latae** is innervated by the **superior gluteal nerve** (L4-S1).
- The superior gluteal nerve is located deeper in the gluteal region and does not traverse the obturator foramen.
*Semitendinosus*
- The **semitendinosus** is one of the hamstring muscles and is innervated by the **tibial division of the sciatic nerve** (L5-S2).
- The sciatic nerve is located posteriorly in the thigh and does not pass through the obturator foramen.
*Transversus abdominis*
- The **transversus abdominis** muscle is innervated by the **thoracoabdominal nerves** (T7-T11) and the **subcostal nerve** (T12).
- These nerves supply the abdominal wall and are anatomically distant from the obturator foramen, hence injury is not expected.
Question 10: A 45-year-old man is brought to the trauma bay by emergency services after a motorbike accident in which the patient, who was not wearing a helmet, hit a pole of a streetlight with his head. When initially evaluated by the paramedics, the patient was responsive, albeit confused, opened his eyes spontaneously, and was able to follow commands. An hour later, upon admission, the patient only opened his eyes to painful stimuli, made incomprehensible sounds, and assumed a flexed posture. The vital signs are as follows: blood pressure 140/80 mm Hg; heart rate 59/min; respiratory rate 11/min; temperature 37.0℃ (99.1℉), and SaO2, 95% on room air. The examination shows a laceration and bruising on the left side of the head. There is anisocoria with the left pupil 3 mm more dilated than the right. Both pupils react sluggishly to light. There is an increase in tone and hyperreflexia in the right upper and lower extremities. The patient is intubated and mechanically ventilated, head elevated to 30°, and sent for a CT scan. Which of the following management strategies should be used in this patient, considering his most probable diagnosis?
A. Middle meningeal artery embolization
B. Ventricular drainage
C. Surgical evacuation (Correct Answer)
D. Decompressive craniectomy
E. Conservative management with hyperosmolar solutions
Explanation: ***Surgical evacuation***
- This patient presents with a classic picture of **epidural hematoma** (EDH) with signs of herniation, indicated by the rapid neurological decline, **anisocoria**, and contralateral motor deficits. **Urgent surgical evacuation** is the definitive treatment for EDH to relieve mass effect.
- The rapid progression from responsive to severely neurologically compromised, coupled with a history of head trauma and a potential lucid interval, points to an expanding intracranial lesion requiring immediate decompression.
*Middle meningeal artery embolization*
- While the **middle meningeal artery** is often the source of bleeding in EDH, embolization is typically reserved for cases where surgery is contraindicated or as an adjunct for persistent bleeding, not as a primary definitive treatment in an unstable patient.
- It does not immediately relieve the mass effect from a large, established hematoma, which is the acute life-threatening issue.
*Ventricular drainage*
- **Ventricular drainage** is primarily used to reduce **intracranial pressure** (ICP) in cases of **hydrocephalus** or intraventricular hemorrhage.
- It is not the primary treatment for an epidural hematoma, which is an extra-axial collection of blood.
*Decompressive craniectomy*
- **Decompressive craniectomy** involves removing a portion of the skull to allow the brain to swell and reduce ICP, often used in cases of diffuse brain injury and intractable ICP elevation refractory to other measures.
- In cases of an epidural hematoma with a treatable mass, **direct evacuation of the hematoma** and closure is preferred over decompressive craniectomy alone, although craniectomy might be needed if there's underlying brain swelling.
*Conservative management with hyperosmolar solutions*
- **Hyperosmolar solutions** (like mannitol or hypertonic saline) can acutely reduce ICP by drawing fluid from the brain, but they are a temporizing measure.
- They are used to manage ICP while preparing for definitive treatment or in diffuse brain injury, not as a primary treatment for a large, surgically accessible mass lesion causing rapid deterioration and herniation.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
