Transesophageal Echocardiography — MCQs
Investigation of choice for valvular heart disease-
IOC for Acute Aortic Dissection in a Clinically Unstable patient is?
The most sensitive and practical technique for detection of myocardial ischemia in the perioperative period is -
In a Down's syndrome patient posted for surgery, the necessary preoperative investigation to be done is –
MUGA scan is not useful in:
Apex of the lung is best assessed by
Tc-labeled RBCs are used for all except:
Most sensitive method of monitoring cardiovascular ischemia in the perioperative period is -
About diagnosing air embolism with transesophageal echocardiography, which of the following is false?
A patient with mitral stenosis is having surgery tomorrow. There is some liver compromise. Which of the following inhalational agents is preferred?
Transesophageal Echocardiography Indian Medical PG Practice Questions and MCQs
Question 1: Investigation of choice for valvular heart disease-
- A. Nuclear Cardiac imaging
- B. Precordial Doppler
- C. 2 D- Echocardiography (Correct Answer)
- D. MRI
Explanation: ***2 D- Echocardiography*** - **Transthoracic echocardiography (TTE)** is the initial and most common investigation for valvular heart disease due to its non-invasiveness, accessibility, and ability to visualize valve morphology and function in real-time [1]. - It provides critical information on valve structure, leaflet motion, chamber dimensions, ventricular function, and pressure gradients, allowing diagnosis and assessment of severity [2]. *Nuclear Cardiac imaging* - Primarily used for assessing **myocardial perfusion** and viability, rather than direct visualization of valve structure and function. - While it can indirectly assess the impact of valvular disease on ventricular function, it does not provide detailed information about the valves themselves. *Precordial Doppler* - **Doppler echocardiography** is a component of a full echocardiogram, used to quantify blood flow velocities and pressure gradients across valves [1]. - However, "precordial Doppler" is not a standalone comprehensive investigation for valvular disease; it must be combined with 2D imaging for a complete assessment. *MRI* - **Cardiac MRI (CMR)** offers excellent anatomical detail and precise quantification of ventricular volumes and function, and can assess valvular regurgitation. - It is often used as a complementary study in specific cases, particularly for complex congenital heart disease or when echocardiography is inconclusive, but it is not the primary or initial investigation due to cost and accessibility.
Question 2: IOC for Acute Aortic Dissection in a Clinically Unstable patient is?
- A. NCCT
- B. TEE (Correct Answer)
- C. MRI
- D. CT-Angio
Explanation: ***TEE (Transesophageal Echocardiography)*** - **TEE is the investigation of choice** for acute aortic dissection in **hemodynamically unstable patients** due to its **portability and rapidity**. - Can be performed at the **bedside** without transporting the critically ill patient, minimizing risk. - Provides rapid diagnosis (5-10 minutes) with **>95% sensitivity and specificity** for detecting intimal flap and false lumen. - Simultaneously assesses **complications** such as aortic regurgitation, pericardial effusion/tamponade, and ventricular function. - Particularly excellent for visualizing the **ascending aorta** and aortic root. *CT-Angio* - **CT angiography** is the **investigation of choice** for acute aortic dissection in **hemodynamically STABLE patients**. - Provides excellent anatomical detail of the entire aorta, clearly showing the intimal flap, true and false lumens, and branch vessel involvement. - Requires **patient transport** to the radiology department, which is **unsafe in unstable patients**. - Best for comprehensive surgical planning in stable patients. *MRI* - **MRI** offers the highest anatomical detail and is considered the gold standard for **chronic dissection follow-up**. - Its lengthy acquisition time (30-60 minutes) and incompatibility with monitoring equipment make it **unsuitable for acutely unstable patients**. *NCCT* - **Non-contrast CT** may show indirect signs like the **hyperdense crescent sign** in the aortic wall. - Cannot reliably differentiate true and false lumens or assess the full extent of dissection. - Insufficient for definitive diagnosis or management planning.
Question 3: The most sensitive and practical technique for detection of myocardial ischemia in the perioperative period is -
- A. Direct measurement of end diastolic pressure
- B. Radio labeled lactate determination
- C. Magnetic Resonance Spectroscopy
- D. Regional wall motion abnormality detected with the help of 2D transoesophageal echocardiography (Correct Answer)
Explanation: ***Regional wall motion abnormality detected with the help of 2D transesophageal echocardiography*** - **Transesophageal echocardiography (TEE)** provides high-resolution images of the heart, allowing for the sensitive detection of **regional wall motion abnormalities (RWMA)**, an early and practical indicator of myocardial ischemia in the perioperative setting. - The development of new or worsening RWMA is often the **first sign of ischemia**, preceding ECG changes or hemodynamic alterations, making it a highly sensitive and clinically useful tool. *Direct measurement of end-diastolic pressure* - While an elevated **end-diastolic pressure** can indicate ventricular dysfunction, it is an **indirect sign** and not specific enough for early myocardial ischemia detection. - This measurement often requires invasive monitoring, which is less practical for routine detection compared to TEE. *Radio-labeled lactate determination* - **Lactate production** can increase in ischemic tissue, but its detection is a **biochemical marker** that typically lags behind the onset of ischemia. - This technique is generally **research-oriented** and not a practical, bedside method for rapid perioperative ischemia detection. *Magnetic Resonance Spectroscopy* - **Magnetic Resonance Spectroscopy (MRS)** can provide detailed metabolic information about tissue, including changes related to ischemia. - However, it is a **complex, time-consuming, and expensive imaging modality** that is not practical for routine, real-time perioperative monitoring of myocardial ischemia.
Question 4: In a Down's syndrome patient posted for surgery, the necessary preoperative investigation to be done is –
- A. CT Brain
- B. X-ray cervical spine (Correct Answer)
- C. Ultrasound Abdomen
- D. Echocardiography
Explanation: X-ray cervical spine - Patients with Down syndrome have an increased risk of **atlantoaxial instability (AAI)** due to ligamentous laxity and bony abnormalities, which can lead to spinal cord compression during neck manipulation for intubation. - A **preoperative X-ray of the cervical spine** (flexion/extension views) is crucial to assess for AAI and guide anesthetic management to prevent neurological damage. *CT Brain* - While some Down syndrome patients may have structural brain differences, a **CT brain** is not a routine preoperative investigation for all surgeries unless specific neurological symptoms are present. - It is not primarily indicated for assessing the immediate surgical risks associated with conditions common in Down syndrome, such as atlantoaxial instability. *Echocardiography* - Many Down syndrome patients have congenital heart defects (e.g., **AV canal defects**), and an echocardiogram is essential to evaluate cardiac function and structure, especially for major surgeries. - However, compared to the immediate risk of spinal cord injury during airway management, assessing **atlantoaxial instability** with a cervical spine X-ray takes precedence as a necessary and specific preoperative investigation for general surgery. *Ultrasound Abdomen* - Down syndrome patients have a higher incidence of certain gastrointestinal anomalies (e.g., **duodenal atresia**, Hirshsprung's disease) and often develop premature aging of organs. - An **abdominal ultrasound** is not a standard preoperative screening test unless there are specific abdominal symptoms or indications for evaluating potential anomalies or complications.
Question 5: MUGA scan is not useful in:
- A. Stroke volume
- B. Regional wall perfusion (Correct Answer)
- C. Left ventricular ejection fraction
- D. Regional wall motion
Explanation: ***Regional wall perfusion*** - A MUGA scan assesses **ventricular function** through blood pool imaging, evaluating wall motion and ejection fraction. - It does not directly visualize or quantify myocardial perfusion, which is the flow of blood through the coronary arteries to the heart muscle. *Stroke volume* - A MUGA scan accurately measures **end-diastolic volume** and **end-systolic volume**, from which stroke volume (EDV – ESV) can be calculated. - This parameter directly reflects the amount of blood pumped out by the ventricle with each beat. *Left ventricular ejection fraction* - The MUGA scan is considered a gold standard for calculating **left ventricular ejection fraction** (LVEF), a key indicator of cardiac pump function. - It uses a count-based method from gated blood pool images to determine the percentage of blood ejected from the left ventricle. *Regional wall motion* - MUGA scans are highly effective in assessing **regional wall motion abnormalities**, identifying areas of **hypokinesis**, **akinesis**, or **dyskinesis**. - This is crucial for diagnosing and monitoring conditions like myocardial ischemia or infarction, and is a primary utility of the scan.
Question 6: Apex of the lung is best assessed by
- A. AP view
- B. PA view
- C. Lordotic view (Correct Answer)
- D. Oblique view
Explanation: ***Lordotic view*** - The **lordotic view** is a specialized chest X-ray projection specifically designed to visualize the **lung apices** clearly by projecting the clavicles superiorly. - This view is achieved by leaning the patient backward (lordotic position) while the X-ray beam is angled, or by angling the X-ray tube itself superiorly. *AP view* - The **AP (Anteroposterior) view** often projects the **clavicles over the lung apices**, obscuring them and making thorough assessment difficult. - This general chest X-ray view is primarily used when the patient cannot stand or sits upright for a PA view. *PA view* - Similar to the AP view, the standard **PA (Posteroanterior) view** can also have the **clavicles superimpose the lung apices**, making subtle apical pathology hard to detect. - While a routine chest X-ray, it's not optimal for detailed evaluation of the uppermost lung regions. *Oblique view* - **Oblique views** are primarily used to separate superimposed structures or to better visualize specific areas that are obscured in standard AP or PA views, but they are not the best for the apices. - They are often employed to assess the pleura, hilum, or specific lung segments by rotating the patient.
Question 7: Tc-labeled RBCs are used for all except:
- A. Liver adenoma (Correct Answer)
- B. LV function
- C. GI bleeding
- D. Liver hemangioma
Explanation: ***Liver adenoma*** - Tc-labeled RBCs are primarily used to highlight a specific type of tissue or process. **Liver adenomas** do not typically show an affinity for **Tc-labeled RBCs**, as they are benign epithelial tumors with a different vascular composition. - While adenomas can be vascular, they do not inherently contain the **vascular pooling** or blood volume characteristics that would be specifically targeted by **Tc-labeled RBCs** for diagnostic imaging. *LV function* - **Tc-labeled RBCs** (or Tc-99m-pertechnetate) are commonly used in **gated blood pool imaging** (MUGA scan) to assess **left ventricular (LV) function**, including **ejection fraction** and wall motion abnormalities. - This technique directly visualizes the blood pool within the cardiac chambers, making it suitable for assessing functional parameters of the heart. *GI bleeding* - **Tc-labeled RBCs** are a standard imaging agent for detecting and localizing **active gastrointestinal (GI) bleeding**, especially when the bleeding rate is intermittent or slow. - The labeled RBCs extravasate at the site of hemorrhage, creating a 'hot spot' that can be identified over time. *Liver hemangioma* - **Tc-labeled RBCs** are highly effective in diagnosing **liver hemangiomas**, which are benign vascular tumors composed of large, dilated blood vessels. - These lesions show characteristic uptake and retention of **labeled RBCs** due to their slow blood flow and large intravascular space, appearing as early peripheral enhancement with subsequent centripetal filling.
Question 8: Most sensitive method of monitoring cardiovascular ischemia in the perioperative period is -
- A. NIBP
- B. ECG
- C. Pulse oximeter
- D. TEE (Correct Answer)
Explanation: ***TEE*** - **Transesophageal echocardiography (TEE)** is the most sensitive method for detecting perioperative myocardial ischemia because it can visualize **regional wall motion abnormalities** and changes in **ventricular function** much earlier than ECG. - **Ischemia** directly impairs the contractility of the affected myocardium, leading to subtle changes in wall motion that TEE can identify. *NIBP* - **Non-invasive blood pressure (NIBP)** monitoring can detect **hemodynamic changes** (like hypotension or hypertension) that may precede or accompany ischemia. - However, these changes are **non-specific** and occur relatively late, making NIBP a less sensitive indicator of early ischemia. *ECG* - **Electrocardiography (ECG)** monitors the electrical activity of the heart and can detect **ST-segment changes** indicative of ischemia. - While useful, ECG changes may appear later than wall motion abnormalities, and **silent ischemia** can be missed if the leads are not optimally placed or if the ischemia does not produce significant electrical changes. *Pulse oximeter* - A **pulse oximeter** measures **oxygen saturation** in the peripheral blood. - It is primarily used to assess **respiratory function** and tissue oxygenation, and it does not directly monitor myocardial ischemia or cardiac function.
Question 9: 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.
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.
Question 10: A patient with mitral stenosis is having surgery tomorrow. There is some liver compromise. Which of the following inhalational agents is preferred?
- A. Enflurane
- B. Xenon
- C. Sevoflurane (Correct Answer)
- D. Halothane
Explanation: ***Sevoflurane*** - **Sevoflurane** is preferred due to its **minimal hepatic metabolism** and rapid elimination, making it a safer option in patients with **liver compromise**. - It maintains **cardiovascular stability**, which is beneficial in mitral stenosis and avoids the arrhythmogenic potential seen with other agents. *Enflurane* - **Enflurane** is extensively metabolized in the liver, leading to the production of inorganic fluoride ions, which can cause **renal toxicity**. - It can also induce a decrease in **hepatic blood flow**, exacerbating existing liver compromise. *Xenon* - While **Xenon** has excellent cardiovascular stability and minimal metabolism, its **high cost** and **limited availability** make it an impractical choice for routine use. - Its anesthetic potency is relatively low, requiring **higher concentrations** for surgical anesthesia. *Halothane* - **Halothane** is associated with a significant risk of **halothane-induced hepatitis** due to its extensive hepatic metabolism and the production of toxic metabolites. - It can also cause **cardiac depression** and **arrhythmias**, which are undesirable in patients with mitral stenosis.
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