Cardiovascular Radiology — MCQs

Cardiovascular Radiology Indian Medical PG Practice Questions and MCQs

Question 71: Cardiac CT is best performed during which phase of the cardiac cycle?

A. Early systole
B. Mid systole
C. Mid diastole (Correct Answer)
D. Early diastole

Explanation: **Explanation:** The primary goal of Cardiac CT (specifically Coronary CT Angiography) is to visualize the coronary arteries with minimal motion artifact. To achieve high spatial resolution, the scan must be performed when the heart is most stationary. **Why Mid Diastole is Correct:** During the cardiac cycle, the period of minimal cardiac motion is known as **diastasis** (mid-to-late diastole). In this phase, ventricular filling slows down significantly before atrial contraction begins. Because the coronary arteries are small and move rapidly with the myocardium, imaging during this "quiet" window ensures the sharpest images. For patients with a normal heart rate (60–70 bpm), the **mid-diastolic phase** (typically 70-80% of the R-R interval) is the optimal trigger point. **Why Incorrect Options are Wrong:** * **Early and Mid Systole (A & B):** During systole, the ventricles are vigorously contracting. This high-velocity motion leads to significant "blurring" or motion artifacts, making it impossible to evaluate fine coronary anatomy. * **Early Diastole (D):** This corresponds to the rapid filling phase. The sudden influx of blood into the ventricles causes rapid expansion and movement of the heart walls, which is not ideal for high-resolution imaging. **High-Yield Clinical Pearls for NEET-PG:** * **Heart Rate Control:** A slow, steady heart rate is crucial. **Beta-blockers** (e.g., Oral/IV Metoprolol) are often administered to keep the heart rate below 65 bpm to lengthen the diastolic window. * **Nitroglycerin:** Often given sublingually before the scan to dilate coronary arteries and improve visualization. * **High Heart Rates:** If the heart rate is high (>80 bpm), the diastolic window shortens significantly; in such cases, **end-systole** may occasionally be used as an alternative imaging window, though mid-diastole remains the gold standard for most. * **Prospective vs. Retrospective Gating:** Prospective gating (triggering only during diastole) reduces radiation dose compared to retrospective gating.

Question 72: Which imaging modality is used to diagnose a vascular ring causing external airway compression?

A. CT
B. PET CT
C. MRI
D. Angiography of aortic and pulmonary circulation (Correct Answer)

Explanation: **Explanation:** The diagnosis of a **vascular ring**—a congenital anomaly where the aortic arch and its branches encircle and compress the trachea and esophagus—requires precise visualization of the vascular anatomy in relation to the airway. **1. Why Option D is Correct:** Historically and for definitive diagnostic confirmation, **Angiography of the aortic and pulmonary circulation** is considered the gold standard. It provides a detailed "map" of the aberrant vessels, their origins, and their relationship to the pulmonary arteries. In the context of NEET-PG, while non-invasive imaging is common in practice, angiography remains the classic academic answer for definitive diagnosis of complex vascular malformations causing mechanical compression. **2. Why Other Options are Incorrect:** * **CT (Option A):** While MDCT (Multidetector CT) is excellent for visualizing the airway (tracheomalacia) and vessel wall, it involves ionizing radiation and was traditionally secondary to angiography for surgical planning. * **PET CT (Option B):** This is a functional imaging modality used primarily for oncology and inflammation; it has no role in diagnosing structural vascular anomalies. * **MRI (Option C):** Cardiac MRI is excellent for flow dynamics and anatomy without radiation, but it is often limited by long acquisition times and is less effective than angiography for fine branching patterns in infants. **Clinical Pearls for NEET-PG:** * **Most common vascular ring:** Double Aortic Arch. * **Clinical Presentation:** "Stridor since birth," "barking cough," and dysphagia (dysphagia lusoria). * **Barium Swallow Finding:** Posterior indentation of the esophagus is a classic sign of a vascular ring. * **Echocardiography:** Often the first-line screening tool, but limited by the "acoustic window" in visualizing the retro-esophageal vessels.

Question 73: Which of the following is NOT a feature of a normal venous Doppler study?

A. Triphasic pattern (Correct Answer)
B. Flow ceases with Valsalva maneuver
C. Flow augmentation with distal compression
D. Compressibility

Explanation: In venous Doppler ultrasonography, understanding the distinction between normal venous flow and arterial flow is critical for diagnosing conditions like Deep Vein Thrombosis (DVT). ### **Explanation of the Correct Answer** **Option A (Triphasic pattern)** is the correct answer because a triphasic waveform is a characteristic of **normal peripheral arteries** (e.g., femoral or brachial arteries), not veins. Normal peripheral venous flow is typically **phasic**, meaning it varies with the respiratory cycle (decreasing during inspiration and increasing during expiration in lower limbs). A triphasic pattern in a vein would be highly abnormal, often suggesting a fistula or proximity to the heart (e.g., hepatic veins). ### **Analysis of Incorrect Options** * **Option B (Flow ceases with Valsalva):** This is a normal finding. The Valsalva maneuver increases intra-abdominal pressure, which temporarily halts venous return from the lower extremities. Absence of this cessation suggests proximal obstruction or valvular incompetence. * **Option C (Flow augmentation):** This is a normal feature. Manually squeezing the limb distal to the probe should cause a sudden "spurt" or surge in flow. Failure to augment indicates an intervening thrombus. * **Option D (Compressibility):** This is the **most sensitive sign** of a normal vein. A healthy vein has thin walls and low pressure; it should completely collapse under gentle probe pressure. Non-compressibility is the hallmark of DVT. ### **NEET-PG High-Yield Pearls** * **Hallmark of DVT:** Loss of compressibility is the single most reliable ultrasound sign for DVT. * **Phasicity:** Normal veins show "respiratory phasicity." Loss of phasicity (flat waveform) suggests a proximal obstruction. * **Hepatic Veins:** Unlike peripheral veins, hepatic veins normally show a **pulsatile/triphasic** pattern due to their proximity to the right atrium. * **Continuous Flow:** If a peripheral vein shows continuous flow instead of phasic flow, suspect a proximal clot or extrinsic compression.

Question 74: Which condition is characterized by an "egg in cup" appearance on imaging?

A. Tetralogy of Fallot (TOF)
B. Mitral Regurgitation (MR)
C. Constrictive pericarditis (Correct Answer)
D. Transposition of great vessels

Explanation: **Explanation:** **1. Why Constrictive Pericarditis is Correct:** The "egg in cup" appearance is a classic radiological sign of **Constrictive Pericarditis**. In this condition, chronic inflammation leads to a thickened, fibrotic, and often calcified pericardium. On a lateral chest X-ray or CT scan, the heart (the "egg") appears encased within a rigid, calcified shell (the "cup"). This calcification is most commonly seen in the atrioventricular grooves. **2. Analysis of Incorrect Options:** * **Tetralogy of Fallot (TOF):** Characterized by a **"Boot-shaped heart"** (Coeur en sabot) due to right ventricular hypertrophy and an upturned apex. * **Mitral Regurgitation (MR):** Typically presents with left atrial and left ventricular enlargement. While it can lead to a "double atrial shadow," it does not produce a calcified "cup" appearance. * **Transposition of the Great Vessels (TGA):** Characterized by an **"Egg-on-a-string"** appearance. The "egg" represents the globular cardiomegaly, and the "string" represents the narrowed superior mediastinum due to the stress-induced thymic atrophy and the anteroposterior alignment of the great vessels. **3. Clinical Pearls for NEET-PG:** * **Most common cause** of constrictive pericarditis in India is **Tuberculosis**. * **Kussmaul’s sign** (paradoxical rise in JVP on inspiration) and **Pericardial knock** (early diastolic sound) are key clinical findings. * **Imaging Gold Standard:** Cardiac MRI or CT is superior to X-ray for visualizing pericardial thickening (>3mm). * **Surgical Treatment:** Pericardiectomy.

Question 75: The "Inveed Moustache Sign" is seen in which of the following conditions?

A. Total anomalous pulmonary venous connection (TAPVC)
B. Partial anomalous pulmonary venous connection (PAPVC)
C. Constrictive pericarditis
D. Congestive heart failure (CHF) (Correct Answer)

Explanation: ### Explanation The **"Inverted Moustache Sign"** (also known as the **Antler Sign** or **Cephalization**) is a classic radiological finding in **Congestive Heart Failure (CHF)**, specifically indicating pulmonary venous hypertension. **1. Why CHF is Correct:** In a healthy upright individual, gravity causes better perfusion of the lower lung zones. However, in CHF, as the Left Atrial Pressure (LAP) rises (typically to 12–18 mmHg), there is a redistribution of blood flow to the upper lobes. This occurs due to perivascular edema in the lower lobes causing reflex vasoconstriction. On a chest X-ray, the upper lobe pulmonary veins become dilated and prominent, curving upward and outward, resembling an **inverted moustache** or **deer antlers**. **2. Analysis of Incorrect Options:** * **TAPVC (Total Anomalous Pulmonary Venous Connection):** Supracardiac TAPVC is associated with the **"Snowman Sign"** or **"Figure of 8"** appearance due to a dilated vertical vein and SVC. * **PAPVC (Partial Anomalous Pulmonary Venous Connection):** Often associated with the **"Scimitar Sign,"** where an anomalous pulmonary vein drains into the IVC, appearing as a curved sword parallel to the right heart border. * **Constrictive Pericarditis:** The hallmark radiological sign is **pericardial calcification** (best seen on a lateral X-ray) and a narrow, tubular heart. **3. Clinical Pearls for NEET-PG:** * **Stages of Pulmonary Edema on CXR:** * **Stage 1 (Redistribution):** Cephalization/Inverted Moustache Sign (PCWP 13–18 mmHg). * **Stage 2 (Interstitial Edema):** Kerley B lines, peribronchial cuffing, and hazy hila (PCWP 18–25 mmHg). * **Stage 3 (Alveolar Edema):** **"Bat-wing"** or **"Butterfly"** opacities (PCWP >25 mmHg). * **Kerley B lines** are short, horizontal lines perpendicular to the pleura at the lung bases, representing thickened interlobular septa.

Question 76: Which technique is not recently used to check for disorder or patency of coronary artery circulation?

A. Intravascular Ultrasound (USG)
B. CT guided angiography
C. Echocardiography
D. Ultrasound (USG) (Correct Answer)

Explanation: **Explanation:** The core of this question lies in the anatomical location and size of the coronary arteries. The coronary arteries are small vessels (2–4 mm) located deep within the chest, behind the bony rib cage and air-filled lungs, and are constantly moving due to the cardiac cycle. **Why Ultrasound (USG) is the correct answer:** Standard transabdominal or surface **Ultrasound (USG)** cannot be used to visualize coronary artery patency. This is because ultrasound waves cannot penetrate bone (ribs/sternum) or air (lungs) effectively to reach the heart with enough resolution to see tiny coronary vessels. Therefore, conventional USG has no role in assessing coronary circulation. **Analysis of Incorrect Options:** * **Intravascular Ultrasound (IVUS):** This is a "gold standard" invasive imaging modality where a miniature ultrasound probe is placed *inside* the artery via a catheter. It provides high-resolution cross-sectional images of the vessel wall and plaque. * **CT Angiography (CCTA):** This is the most common non-invasive method used recently to check patency. Multidetector CT (MDCT) allows for excellent visualization of the coronary lumen and detection of stenosis. * **Echocardiography:** While it doesn't see the arteries directly as well as CT, it is used to check for "regional wall motion abnormalities" (RWMA). If a coronary artery is blocked, the corresponding heart muscle won't contract properly, indirectly indicating a circulation disorder. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Coronary Anatomy:** Conventional Coronary Angiography (Invasive). * **Best Non-Invasive Screening:** CT Coronary Angiography (High Negative Predictive Value). * **IVUS Use:** Best for assessing stent apposition and plaque morphology during PCI. * **Fractional Flow Reserve (FFR):** The modern standard for assessing the *functional* significance of a coronary stenosis.

Question 77: Which of the following chest x-ray findings is a common feature of ARDS and cardiogenic pulmonary edema?

A. Cardiomegaly
B. Pleural effusions
C. Pulmonary vascular redistribution
D. Alveolar and interstitial opacities (Correct Answer)

Explanation: ### Explanation The correct answer is **D. Alveolar and interstitial opacities.** Both **Acute Respiratory Distress Syndrome (ARDS)** and **Cardiogenic Pulmonary Edema (CPE)** represent forms of pulmonary edema, though their underlying mechanisms differ. In both conditions, fluid accumulates within the lung parenchyma (interstitium) and eventually spills into the air sacs (alveoli). On a chest X-ray, this manifests as bilateral, patchy, or confluent opacities. While the distribution may vary—CPE often shows a "bat-wing" perihilar pattern and ARDS is often more peripheral—the presence of alveolar and interstitial opacities is the fundamental radiographic hallmark shared by both. #### Analysis of Incorrect Options: * **A. Cardiomegaly:** This is a classic feature of **CPE** (due to heart failure). In ARDS (non-cardiogenic edema), the heart size is typically normal. * **B. Pleural effusions:** These are common and often bilateral in **CPE**. While they can occur in ARDS, they are usually absent or very small. Their prominent presence strongly favors a cardiac etiology. * **C. Pulmonary vascular redistribution:** Also known as "cephalization" (prominent upper lobe vessels), this is an early sign of increased pulmonary venous pressure seen in **CPE**. It is not a feature of ARDS. #### High-Yield Clinical Pearls for NEET-PG: * **PCWP (Pulmonary Capillary Wedge Pressure):** The gold standard to differentiate the two. In CPE, PCWP is **>18 mmHg**; in ARDS, it is **≤18 mmHg**. * **Air Bronchograms:** More commonly seen in ARDS due to the dense alveolar consolidation. * **Kerley B Lines:** Horizontal lines at the lung bases indicating interstitial edema; these are characteristic of **CPE**, not ARDS. * **Key Differentiator:** If the CXR shows a normal heart size, no pleural effusion, and peripheral opacities, think **ARDS**.

Question 78: Which imaging modality is best for assessing plaque morphology in atherosclerosis?

A. Coronary Computed Tomography Angiography (CCTA) (Correct Answer)
B. Echocardiography
C. Electrocardiogram (ECG)
D. Coronary Angiography

Explanation: **Explanation:** **Coronary Computed Tomography Angiography (CCTA)** is the correct answer because it is the only non-invasive modality capable of visualizing the vessel wall itself, rather than just the lumen. CCTA utilizes Hounsfield Units (HU) to differentiate between various plaque components based on their density. It can identify **calcified plaques** (high density), **non-calcified/soft plaques** (low density), and **lipid-rich necrotic cores**. This ability to characterize plaque morphology is crucial for identifying "vulnerable plaques" (e.g., positive remodeling, low-attenuation plaque, and the "napkin-ring sign") which are prone to rupture. **Why other options are incorrect:** * **Coronary Angiography (CAG):** While it is the "Gold Standard" for assessing luminal stenosis, it is a **luminogram**. It shows the flow of dye within the vessel but cannot visualize the vessel wall or the internal morphology of the plaque. * **Echocardiography:** This is excellent for assessing cardiac chambers, valves, and wall motion abnormalities, but it lacks the spatial resolution to visualize coronary artery plaque morphology. * **Electrocardiogram (ECG):** This measures the electrical activity of the heart. It can detect ischemia or infarction resulting from plaque rupture but cannot visualize the plaque itself. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard for Plaque Morphology (Invasive):** Intravascular Ultrasound (IVUS) or Optical Coherence Tomography (OCT). * **Best Non-Invasive Modality:** CCTA. * **Negative Predictive Value (NPV):** CCTA has a very high NPV (~99%), making it excellent for ruling out Coronary Artery Disease (CAD) in low-to-intermediate risk patients. * **Calcium Scoring:** Uses the **Agatston Score** on non-contrast CT to predict future cardiovascular events.

Question 79: Ground glass appearance of the ventricular septum is seen in which of the following conditions?

A. Tetralogy of Fallot (TOF)
B. Hypertrophic Obstructive Cardiomyopathy (HOCM) (Correct Answer)
C. Transposition of the Great Arteries (TGA)
D. Congestive Heart Failure (CHF)

Explanation: ### Explanation **Correct Answer: B. Hypertrophic Obstructive Cardiomyopathy (HOCM)** The "ground glass appearance" of the ventricular septum is a characteristic finding on **Echocardiography** (specifically 2D-Echo) in patients with HOCM. This appearance is due to the **disarray of myocardial fibers** and the presence of interstitial fibrosis. In HOCM, the normal parallel arrangement of myocytes is replaced by a disorganized, "whorled" pattern. These abnormal interfaces reflect ultrasound waves differently, resulting in a speckled, bright, or "ground glass" echogenicity within the thickened interventricular septum. **Analysis of Incorrect Options:** * **A. Tetralogy of Fallot (TOF):** Characterized by a "boot-shaped heart" (Coeur en sabot) on X-ray due to right ventricular hypertrophy and an upturned apex, but it does not feature ground glass septal changes. * **C. Transposition of the Great Arteries (TGA):** Classically presents with an "egg-on-a-string" appearance on a chest X-ray due to a narrow mediastinum. * **D. Congestive Heart Failure (CHF):** Radiological hallmarks include cardiomegaly, Kerley B lines, cephalization of pulmonary veins (Antler sign), and pleural effusion. **High-Yield Clinical Pearls for NEET-PG:** * **HOCM Echo Triad:** Asymmetric Septal Hypertrophy (ASH), Systolic Anterior Motion (SAM) of the mitral valve, and mid-systolic closure of the aortic valve. * **Genetic Basis:** Most commonly due to mutations in the **Beta-myosin heavy chain** or Myosin-binding protein C genes. * **Murmur:** Harsh systolic ejection murmur that **increases** with Valsalva or standing (decreased preload) and **decreases** with squatting (increased preload).

Question 80: Plethoric lung fields are seen in all of the following conditions, except?

A. Atrial septal defect (ASD)
B. Total anomalous pulmonary venous connection (TAPVC)
C. Ebstein's anomaly (Correct Answer)
D. Ventricular septal defect

Explanation: **Explanation:** The term **"Plethoric lung fields"** refers to increased pulmonary vascular markings on a chest X-ray, indicating increased pulmonary blood flow (Left-to-Right shunts). **1. Why Ebstein’s Anomaly is the Correct Answer:** Ebstein’s anomaly is characterized by the downward displacement of the tricuspid valve leaflets into the right ventricle, leading to "atrialization" of the ventricle. This results in severe tricuspid regurgitation and a functional reduction in right ventricular output. Consequently, there is **decreased pulmonary blood flow**, leading to **Oligemic lung fields** (translucent/darker lungs) rather than plethoric ones. It is classically associated with a "Box-shaped" heart. **2. Analysis of Incorrect Options:** * **Atrial Septal Defect (ASD):** A classic left-to-right shunt where blood flows from the left atrium to the right atrium, increasing the volume handled by the right heart and lungs, leading to plethora. * **Ventricular Septal Defect (VSD):** The most common congenital heart disease causing a left-to-right shunt at the ventricular level, resulting in increased pulmonary blood flow and plethora. * **Total Anomalous Pulmonary Venous Connection (TAPVC):** This is a cyanotic heart disease with **increased pulmonary blood flow** because all pulmonary veins drain into the right atrium (mixing of blood), leading to pulmonary plethora. **Clinical Pearls for NEET-PG:** * **Plethora (↑ Flow):** ASD, VSD, PDA, TAPVC, Transposition of Great Arteries (TGA). * **Oligemia (↓ Flow):** Fallot’s Tetralogy (TOF), Ebstein’s Anomaly, Tricuspid Atresia, Pulmonary Stenosis. * **Radiological Signs:** * **Ebstein’s:** Box-shaped heart. * **TAPVC (Supracardiac):** Snowman sign / Figure of 8 appearance. * **TOF:** Boot-shaped heart (Coeur en sabot).

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