Embolization Procedures — MCQs
What is the next best step for a 22-year-old with a hepatic hemangioma on ultrasound?
During cesarean section under general endotracheal anaesthesia, venous air embolism
Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
Procedure of choice for control of massive hemoptysis?
Venous air embolism during surgery is seen with
Which of the following is not true about pulmonary embolus
Where are venous emboli most often lodged?
Which is the investigation of choice for fat embolism?
Which one of the following is the investigation of choice in a patient with haematemesis?
Which of the following liver metastases appear hypoechoic on ultrasound?
Embolization Procedures Indian Medical PG Practice Questions and MCQs
Question 1: What is the next best step for a 22-year-old with a hepatic hemangioma on ultrasound?
- A. Angiography
- B. CT
- C. Biopsy
- D. MRI (Correct Answer)
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is the most sensitive and specific imaging modality for confirming the diagnosis of a **hepatic hemangioma** due to its characteristic enhancement patterns. - An MRI with contrast (e.g., gadolinium) can definitively distinguish a hemangioma from other **benign or malignant liver lesions**, especially when the ultrasound findings are equivocal. *Angiography* - **Angiography** is an invasive procedure and is typically reserved for cases where **embolization** or surgical resection of a very large or symptomatic hemangioma is being considered. - It is not the initial diagnostic choice for confirming a suspected hemangioma identified on **ultrasound**. *CT* - A **CT scan** with contrast can also characterize a hemangioma, showing peripheral nodular enhancement followed by progressive centripetal fill-in. - However, **MRI** generally offers superior soft tissue contrast and provides more definitive diagnostic features for hemangiomas, particularly in younger patients where radiation exposure from CT is a concern. *Biopsy* - **Biopsy** of a suspected hepatic hemangioma is generally contraindicated due to the risk of **hemorrhage** and is rarely necessary for diagnosis. - Imaging characteristics (especially on MRI) are usually sufficient to confirm the diagnosis without the need for an invasive procedure.
Question 2: During cesarean section under general endotracheal anaesthesia, venous air embolism
- A. Induces severe hypertension
- B. Is associated with decreased end-tidal CO2 (Correct Answer)
- C. Should be treated with nitrous oxide
- D. Is associated with high end-tidal CO2
Explanation: ***Is associated with decreased end-tidal CO2*** - Venous air embolism causes **pulmonary artery obstruction**, leading to ventilation-perfusion mismatch and decreased blood flow to the lungs. - This reduced pulmonary blood flow results in a significant **decrease in expired CO2**, as less CO2 is delivered to the alveoli for exhalation. *Induces severe hypertension* - Venous air embolism typically causes **hypotension** due to reduced cardiac output and right ventricular failure, not hypertension. - Direct effects of air in the circulation include **vasodilation** and myocardial depression, contributing to a drop in blood pressure. *Should be treated with nitrous oxide* - **Nitrous oxide** should be avoided in cases of venous air embolism as it expands gas-filled spaces, potentially increasing the size of the air embolus and worsening patient outcomes. - Treatment involves 100% oxygen, Trendelenburg position, left lateral decubitus, and aspiration of air from the right atrium, not the administration of additional gas. *Is associated with high end-tidal CO2* - A high end-tidal CO2 would indicate improved ventilation or perfusion, which is contrary to the effects of a venous air embolism that **reduces pulmonary blood flow** and thus CO2 exchange. - The hallmark respiratory sign of venous air embolism is a **sudden profound decrease in end-tidal CO2** due to arterial obstruction.
Question 3: Which of the following is the platinum-based chemotherapeutic agent used as first-line treatment for ovarian carcinoma?
- A. Cyclophosphamide
- B. Methotrexate
- C. Cisplatin (Correct Answer)
- D. Dacarbazine
Explanation: ***Cisplatin*** - **Cisplatin** is a platinum-based chemotherapy drug that forms **DNA cross-links**, inhibiting DNA synthesis and leading to the death of rapidly dividing cells, making it highly effective against **ovarian carcinoma**. - It is a cornerstone of chemotherapy regimens for ovarian cancer, often used in combination with other agents such as paclitaxel. *Methotrexate* - **Methotrexate** is an **antimetabolite** that inhibits dihydrofolate reductase, thereby interfering with DNA synthesis. - While it is used in various cancers like leukemia, lymphoma, and some solid tumors (e.g., breast cancer, gestational trophoblastic disease), it is **not a primary recommended drug for ovarian carcinoma**. *Cyclophosphamide* - **Cyclophosphamide** is an **alkylating agent** that causes DNA damage, leading to cell death. - It is used in many cancers, including lymphoma, breast cancer, and some leukemias, but it is **not a first-line or primary agent for ovarian carcinoma** in contemporary treatment guidelines. *Dacarbazine* - **Dacarbazine** is an **alkylating agent** primarily used in the treatment of **malignant melanoma** and Hodgkin lymphoma. - It is **not indicated for the treatment of ovarian carcinoma**.
Question 4: Procedure of choice for control of massive hemoptysis?
- A. Rigid bronchoscopy and Photocoagulation
- B. Bronchial artery embolization (Correct Answer)
- C. Balloon catheter tamponade
- D. Flexible bronchoscopy and cautery
Explanation: ***Bronchial artery embolization*** - **Bronchial artery embolization (BAE)** is the preferred initial treatment for **massive hemoptysis** due to its high success rate and minimally invasive nature. - It works by identifying and occluding the bleeding bronchial arteries, which are the most common source of massive hemoptysis. *Rigid bronchoscopy and Photocoagulation* - **Rigid bronchoscopy** is primarily used for **airway control**, foreign body removal, and occasionally for direct visualization and tamponade in massive hemoptysis. - While **photocoagulation** can be used to treat small bleeds, it is generally ineffective for massive or widespread hemorrhage. *Balloon catheter tamponade* - **Balloon catheter tamponade** can provide temporary control of bleeding by compressing the bleeding site but is not a definitive long-term solution. - It carries risks of tracheal injury and can obstruct the airway, making it a bridging measure until a more definitive treatment can be performed. *Flexible bronchoscopy and cautery* - **Flexible bronchoscopy** is useful for localizing the bleeding site but is **less effective** for controlling massive hemoptysis due to limited suction and instrument channels. - **Cautery** applied through a flexible bronchoscope is generally insufficient for significant bleeding and carries a risk of worsening the hemorrhage.
Question 5: Venous air embolism during surgery is seen with
- A. Lateral position
- B. Supine position
- C. Sitting position (Correct Answer)
- D. Prone position
Explanation: ***Sitting position*** - In the **sitting position** (e.g., for posterior fossa surgery), the surgical site is often above the level of the heart, creating a negative pressure gradient in the veins. - This **negative pressure** can draw air into opened veins if they are not adequately occluded, leading to a venous air embolism. *Lateral position* - While air embolism can occur in various positions if venous sinuses are open, the **lateral position** does not inherently create the same significant negative pressure gradient as the sitting position relative to the heart. - Risk is generally lower compared to positions where the surgical field is significantly elevated above the heart. *Supine position* - In the **supine position**, the surgical field is typically at or below heart level, which minimizes the likelihood of a negative pressure gradient in the veins. - This position is generally considered to have a **lower risk** for venous air embolism compared to upright positions. *Prone position* - The **prone position** can also increase central venous pressure if abdominal compression occurs, making venous air embolism less likely due to a positive venous pressure. - Although other surgical complications can arise, a venous air embolism is **not a classic risk** specifically associated with the prone position from a negative pressure standpoint.
Question 6: Which of the following is not true about pulmonary embolus
- A. Most lesions affect the lower lobes
- B. Saddle embolus may cause sudden death
- C. Most of the emboli cause infarction (Correct Answer)
- D. Small arterioles are blocked
Explanation: ***Most of the emboli cause infarction*** - While pulmonary emboli block blood flow, the **dual blood supply to the lungs** (pulmonary and bronchial arteries) typically prevents infarction in most cases. - Pulmonary infarction occurs in only about **10% of pulmonary embolism (PE) cases**, usually when the bronchial circulation is compromised or the patient has pre-existing heart failure. *Most lesions affect the lower lobes* - This statement is generally true; **pulmonary emboli are more common in the lower lobes** due to higher blood flow and gravitational effects [1]. - The majority of emboli tend to settle in areas with greater vascularity and gravity-dependent perfusion [1]. *Saddle embolus may cause sudden death* - This is true; a **saddle embolus** is a large embolus that straddles the bifurcation of the main pulmonary artery, blocking blood flow to both lungs. - It leads to **acute right heart failure** and circulatory collapse, often resulting in sudden cardiovascular death. *Small arterioles are blocked* - This statement is not entirely accurate; while small emboli can block arterioles, many significant pulmonary emboli are large enough to obstruct **larger pulmonary arteries and their major branches**. - The size of the blocked vessel depends on the size of the embolus, ranging from small arterioles to lobar or main pulmonary arteries.
Question 7: Where are venous emboli most often lodged?
- A. Lungs (Correct Answer)
- B. Kidneys
- C. Intestinal veins
- D. Coronary arteries
Explanation: ***Lungs*** - **Venous emboli** are primarily lodged in the **pulmonary arteries**, causing **pulmonary embolism** [1]. - This occurs due to **deep vein thrombosis (DVT)** where clots travel to the lungs via the venous system [1]. *Heart* - While the heart can be affected by emboli, it usually deals with **arterial embolism** stemming from **atrial fibrillation** or other cardiac conditions. - Venous emboli typically bypass the heart before reaching the lungs; they do not lodge here. *Intestines* - Emboli can affect the intestines but they usually arise from **arterial sources**, leading to **ischemic bowel**. - The intestines are generally not a common site for venous emboli to lodge. *Kidneys* - Kidney emboli often result from **arterial occlusion**, particularly in conditions like **renal artery stenosis**. - Venous emboli do not typically impact the kidneys, as they move toward the pulmonary circulation.
Question 8: Which is the investigation of choice for fat embolism?
- A. Arterial blood gas analysis
- B. CT scan (Correct Answer)
- C. Chest x-ray
- D. MRI
Explanation: CT scan - **CT scans**, particularly of the chest, can visualize **ground-glass opacities** and consolidations, which are suggestive of fat emboli in the lungs. - While not universally diagnostic on its own, it is considered the most informative imaging modality for definitive diagnosis in the appropriate clinical context. *Arterial blood gas analysis* - **ABG analysis** can reveal **hypoxemia** and respiratory alkalosis in fat embolism syndrome, reflecting impaired gas exchange [1]. - However, these findings are non-specific and can be present in various respiratory conditions, making them unsuitable as a definitive diagnostic tool. *Chest x-ray* - A **chest X-ray** may show diffuse bilateral infiltrates, often described as a **"snowstorm" appearance**, in severe cases of fat embolism [1]. - This finding is often delayed and lacks the sensitivity and specificity of a CT scan for early or subtle changes. *MRI* - **MRI** is highly sensitive for detecting **cerebral fat emboli** (e.g., in the brain) and can show characteristic patterns like **"starfield" appearance** on diffusion-weighted imaging. - However, for pulmonary fat embolism, which is the most common and often the primary concern, CT scans are generally preferred due to their clear visualization of lung parenchyma and faster acquisition.
Question 9: Which one of the following is the investigation of choice in a patient with haematemesis?
- A. Flexible upper gastrointestinal endoscopy (Correct Answer)
- B. Contrast enhanced CT scan
- C. Barium meal for stomach and duodenum
- D. Selective left gastric angiography
Explanation: ***Flexible upper gastrointestinal endoscopy*** - This is the **investigation of choice** for haematemesis as it allows for direct visualization of the upper gastrointestinal tract to identify the source of bleeding [1]. - It also enables **therapeutic intervention**, such as injection sclerotherapy, banding, or clip application, to stop the bleeding [1]. *Contrast enhanced CT scan* - A CT scan is generally **not the primary investigation** for acute haematemesis because it offers less diagnostic accuracy for mucosal lesions and cannot provide therapeutic intervention [1]. - While it can identify large bleeds or structural abnormalities, it is **less sensitive for smaller bleeds** or subtle mucosal abnormalities compared to endoscopy. *Barium meal for stomach and duodenum* - A barium meal is **contraindicated in acute gastrointestinal bleeding** as the barium can obscure endoscopic views and interfere with subsequent attempts at endoscopy or angiography [1]. - It provides **limited diagnostic information** about the active bleeding site and offers no therapeutic capabilities. *Selective left gastric angiography* - Angiography is typically reserved for cases of **severe, persistent bleeding** where endoscopy has failed to locate or control the bleed. - It is an **invasive procedure** with potential complications and is not indicated as the initial diagnostic investigation.
Question 10: Which of the following liver metastases appear hypoechoic on ultrasound?
- A. RCC
- B. Colon cancer
- C. Breast cancer (Correct Answer)
- D. Mucinous adenocarcinoma
Explanation: **Breast cancer** - Liver metastases from **breast cancer** frequently present as **hypoechoic lesions** on ultrasound, due to the tumor's cellular composition and vascularity. - This appearance helps differentiate them from other more commonly echogenic or mixed metastatic patterns. *RCC* - **Renal cell carcinoma (RCC)** metastases to the liver often appear **hyperechoic** or **mixed echogenicity** on ultrasound due to their rich vascularity. - This is a distinct characteristic, different from the predominantly hypoechoic nature seen with breast cancer metastases. *Colon cancer* - Liver metastases from **colon cancer** are typically **echogenic** or **mixed echogenicity** on ultrasound, sometimes with a hypoechoic rim ("target sign"). - Their presentation is generally not purely hypoechoic, making them distinguishable from breast cancer metastases. *Mucinous adenocarcinoma* - Liver metastases from **mucinous adenocarcinoma** can be quite variable, but they often appear **complex**, possibly with **cystic components** or mixed echogenicity, rather than uniformly hypoechoic. - The mucin content can create a distinct internal architecture on ultrasound that differs from solid hypoechoic lesions.
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