Ultrasound Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Ultrasound. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Ultrasound Indian Medical PG Question 1: What is the investigation of choice for evaluating biliary pathology?
- A. Contrast enhanced CT abdomen
- B. Duplex Doppler of the abdomen
- C. MRI scan of the abdomen
- D. USG of abdomen (Correct Answer)
Ultrasound Explanation: ***USG of abdomen***
- **Ultrasound (USG)** of the abdomen is the initial and often definitive investigation for biliary pathology due to its **non-invasiveness**, **accessibility**, and ability to visualize gallstones, duct dilation, and inflamed gallbladder walls.
- It is highly sensitive for detecting **cholelithiasis**, **cholecystitis**, and common bile duct obstruction, making it the preferred first-line imaging modality.
*Contrast enhanced CT abdomen*
- While useful for evaluating solid organ pathology and detecting complications, **CT scans** are less sensitive than USG for visualizing gallstones and assessing subtle biliary duct changes.
- CT involves **ionizing radiation** and the use of contrast agents, which are not ideal for initial screening or if radiation exposure is a concern.
*Duplex Doppler of the abdomen*
- **Duplex Doppler** primarily assesses **vascular flow** and is useful for evaluating conditions like portal hypertension or vascular anomalies.
- It has limited utility for directly visualizing the biliary tree or detecting gallstones, and thus is not the investigation of choice for biliary pathology.
*MRI scan of the abdomen*
- **MRI** is an excellent tool for detailed imaging of the biliary tree, especially with **Magnetic Resonance Cholangiopancreatography (MRCP)**, which provides detailed images of the bile ducts without contrast.
- However, MRI is typically reserved for cases where USG findings are inconclusive or when more detailed anatomical information is required, as it is more expensive and less readily available than USG.
Ultrasound Indian Medical PG Question 2: Which of the following is the best in-vivo screening choice for carotid artery stenosis?
- A. Digital Subtraction Angiography (DSA)
- B. CT
- C. MRI
- D. USG (Correct Answer)
Ultrasound Explanation: ***USG***
- **Ultrasound** (USG), specifically **carotid duplex ultrasonography**, is the **safest**, most cost-effective, and readily available initial screening tool for carotid artery stenosis due to its non-invasive nature and ability to visualize blood flow and vessel morphology.
- It combines **B-mode imaging** with **Doppler flow analysis** to provide real-time images and flow velocity measurements, allowing for assessment of the degree of **stenosis** and plaque characteristics without radiation or contrast agents.
- Sensitivity and specificity exceed 85-90% for detecting significant stenosis, making it the preferred first-line screening modality.
*Digital Subtraction Angiography (DSA)*
- **DSA** is the **gold standard** for anatomical detail and remains the most accurate method for quantifying carotid stenosis, but it is **invasive** and requires arterial catheterization.
- It involves **ionizing radiation** and **iodinated contrast agents**, carrying risks of stroke (0.5-1%), arterial dissection, nephrotoxicity, and contrast allergic reactions.
- Due to its invasive nature and associated risks, DSA is reserved for **pre-surgical planning** or when non-invasive imaging is inconclusive, not for initial screening.
*CT*
- **Computed tomography angiography (CTA)** involves **ionizing radiation** and typically requires an **iodinated contrast agent**, which carries risks of allergy and nephrotoxicity.
- Though CTA provides excellent anatomical detail and can visualize vessel wall calcification, it is generally reserved for confirmation or surgical planning rather than initial screening due to its higher cost, radiation exposure, and contrast-related risks.
*MRI*
- **Magnetic resonance angiography (MRA)** can visualize carotid arteries well but is more expensive, less accessible than ultrasound, and may require a **gadolinium-based contrast agent**, which can have adverse effects (nephrogenic systemic fibrosis in renal impairment).
- It is often used when ultrasound findings are equivocal or in cases where CTA is contraindicated, but it's not the preferred initial screening method due to its complexity, cost, longer examination time, and contraindications (pacemakers, metallic implants).
Ultrasound Indian Medical PG Question 3: Most sensitive investigation for abdominal trauma in a hemodynamically stable patient is-
- A. Ultrasonography (FAST)
- B. Diagnostic peritoneal lavage (DPL)
- C. MRI (Magnetic Resonance Imaging)
- D. CT Scan (Computed Tomography) (Correct Answer)
Ultrasound Explanation: ***CT Scan (Computed Tomography)***
- **CT scans** offer superior anatomical detail and can accurately detect organ damage, hemorrhage, and other injuries in **hemodynamically stable** patients with abdominal trauma.
- It is considered the **most sensitive** and specific imaging modality for evaluating blunt and penetrating abdominal trauma when the patient can tolerate the study.
*Ultrasonography (FAST)*
- While effective for detecting **free fluid** (blood) in specific abdominal areas, **Focused Assessment with Sonography for Trauma (FAST)** has lower sensitivity for solid organ injuries or bowel perforations.
- Its primary role is rapid assessment for **hemoperitoneum** to guide immediate management in unstable patients, not detailed injury characterization.
*Diagnostic peritoneal lavage (DPL)*
- **DPL** is an invasive procedure with high sensitivity for detecting **intraperitoneal bleeding**, but it does not identify specific organ injuries or retroperitoneal hemorrhage.
- It is rarely used in hemodynamically stable patients due to its invasiveness and the availability of more detailed imaging techniques.
*MRI (Magnetic Resonance Imaging)*
- **MRI** provides excellent soft tissue contrast but is typically too **time-consuming** and less accessible in urgent trauma settings compared to CT.
- It's generally not the first-line investigation for acute abdominal trauma due to motion artifacts and limited utility in detecting air or bone injuries.
Ultrasound Indian Medical PG Question 4: FAST (Focused Assessment with Sonography for Trauma) is used to detect free fluid in which of the following areas?
- A. Hepatic
- B. Splenic
- C. Pericardial
- D. All of the options (Correct Answer)
Ultrasound Explanation: ***All of the options***
- The **FAST (Focused Assessment with Sonography for Trauma)** exam is a rapid ultrasound done at the bedside in trauma patients to look for **free fluid** (blood) in several key areas.
- The standard FAST views include the **pericardial sac**, **right subcostal (hepatorenal)**, **left subcostal (splenorenal)**, and **pelvic (suprapubic)** regions.
*Hepatic*
- The **hepatorenal recess (Morison's pouch)** is one of the primary areas assessed in a FAST exam to detect free fluid adjacent to the liver.
- Free fluid in this area can indicate significant intra-abdominal bleeding, often associated with **hepatic trauma**.
*Splenic*
- The **splenorenal recess** is another critical view in the FAST exam, looking for free fluid around the spleen.
- This area is frequently checked for bleeding associated with **splenic injury**, which is common in blunt abdominal trauma.
*Pericardial*
- The **pericardial sac** is evaluated in the FAST exam to detect the presence of **pericardial effusion**, particularly **hemopericardium**.
- Hemopericardium can lead to **cardiac tamponade**, a life-threatening condition requiring urgent intervention in trauma settings.
Ultrasound Indian Medical PG Question 5: About diagnosing air embolism with transesophageal echocardiography, which of the following is false?
- A. It can quantify the volume of air embolized.
- B. It is a very sensitive investigation.
- C. Interferes with Doppler when used together. (Correct Answer)
- D. Continuous monitoring is needed to detect venous embolism.
Ultrasound Explanation: ***Interferes with Doppler when used together.***
- Transesophageal echocardiography (TEE) is often used in conjunction with **Doppler ultrasonography** to assess blood flow and cardiac function simultaneously, without significant interference.
- **Doppler** can help detect turbulent flow caused by air emboli, while TEE provides direct visualization of the heart chambers and great vessels.
*It can quantify the volume of air embolized.*
- TEE can visualize air emboli within the cardiac chambers but **cannot accurately quantify the precise volume** of air embolized.
- TEE provides qualitative assessment and can estimate the **severity of air emboli** (e.g., small, moderate, large shower), but not a specific volume in milliliters.
*It is a very sensitive investigation.*
- TEE is indeed a **highly sensitive method** for detecting air emboli, even small amounts, within the heart and major vessels.
- Its proximity to the heart allows for **excellent resolution** and clear visualization, making it superior to precordial Doppler for detecting intracardiac air.
*Continuous monitoring is needed to detect venous embolism.*
- **Venous air emboli** can be intermittent or transient, making continuous TEE monitoring crucial for their detection during high-risk procedures.
- Without continuous monitoring, a brief embolic event could be **missed**, as air can quickly pass through the right heart or dissipate.
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