Cardiology Practice Questions

Q: Which of the following conditions is a known cause of Right Bundle Branch Block (RBBB)?

Cor pulmonale. ### Question Which of the following conditions is a known cause of Right Bundle Branch Block (RBBB)? ### Original Explanation ***Cor pulmonale*** - **Cor pulmonale** is **right ventricular hypertrophy** with or without dilation due to pulmonary hypertension, impacting the right ventricle's conduction system and causing **RBBB** [1]. - The increased pressure and strain on the right side of the heart can damage the right bundle branch, leading to a conduction delay visible as **RBBB** on an ECG [1]. *Normal aging process* - While the **normal aging process** can lead to some degenerative changes in the heart's conduction system, it more commonly causes **Left Anterior Fascicular Block** or **Left Bundle Branch Block (LBBB)**, rather than isolated RBBB. - Significant **RBBB** in an elderly individual often points to an underlying structural or physiological cause rather than mere aging. *Pulmonary embolism* - A **pulmonary embolism** can cause acute **right ventricular strain** and dilation, which can mimic **RBBB** or cause a transient RBBB pattern [1]. - However, **RBBB** is not a direct consequence of the physical obstruction but rather an effect of the resulting **acute pulmonary hypertension** and right heart strain [2]. *Myocardial infarction* - A **myocardial infarction** affecting the **septum** or the **right ventricle** can damage the right bundle branch, leading to **RBBB**. - However, the most classic ECG finding of a myocardial infarction is **ST-segment elevation** or **new Q waves**, with **RBBB** being a potential complication rather than a direct cause [3].

Q: What is the Ankle-Brachial Pressure Index (ABPI) value that indicates imminent risk of necrosis?

< 0.3. ***< 0.3*** - An **ABPI value less than 0.3** signifies **severe critical limb ischemia**, indicating a very high risk of tissue necrosis and limb loss [1]. - At this level, **resting pain** is common, and spontaneous **ulceration or gangrene** is highly probable due to severely compromised blood flow [1]. *0.3 (critical ischemia)* - While 0.3 is generally considered a range of **critical limb ischemia**, an ABPI *strictly less than 0.3* implies an even more severe and acute risk of necrosis [1]. - This value represents a significant stage of arterial disease, but slightly higher than the most imminent risk scenario where necrosis is almost guaranteed. *< 0.6* - An ABPI of **less than 0.6** indicates **moderate to severe peripheral arterial disease (PAD)**, where intermittent claudication is common [1]. - While concerning, it does not typically represent the immediate threat of tissue necrosis as values closer to 0.3 or below do. *0.6 - 0.9 (indicates moderate arterial disease)* - An **ABPI between 0.6 and 0.9** suggests **moderate peripheral arterial disease**, often associated with **claudication symptoms** on exertion [1]. - This range typically does not indicate an imminent risk of necrosis; while blood flow is reduced, it is usually sufficient to prevent tissue death at rest.

Q: The S2 heart sound is best appreciated in:

2nd right intercostal space. ***2nd right intercostal space*** - The **S2 heart sound** is produced primarily by the closure of the **aortic and pulmonic valves** [1]. - The **aortic component (A2)** is best heard at the **right upper sternal border** (2nd right intercostal space), where the aorta is closest to the chest wall [2]. *4th left intercostal space* - This area is typically associated with the **tricuspid valve area**, where tricuspid murmurs and S3/S4 sounds related to the right ventricle can be more prominent. - While heart sounds can be heard here, it is not the primary location for appreciating the S2 sound. *5th left intercostal space* - This is the **mitral area** or **apex**, where the apical impulse is felt and the S1 heart sound (mitral component) is best heard [2]. - The S2 sound is much less prominent here compared to the base of the heart. *3rd left intercostal space* - This is often referred to as **Erb's point**, where murmurs of both aortic and pulmonic origin can sometimes be heard. - While S2 can be heard here, the **2nd right intercostal space** is superior for primarily appreciating the aortic component of S2, and the 2nd left intercostal space for the pulmonic component [2].

Q: Which of the following arrhythmias is most commonly associated with alcohol binge in alcoholics?

Atrial fibrillation. ***Atrial fibrillation*** - **Atrial fibrillation** is the most common arrhythmia associated with alcohol binge, often referred to as **"holiday heart syndrome"** [1]. - Alcohol can trigger AF by affecting **autonomic tone**, causing **electrolyte imbalances**, and direct **myocardial toxicity**, leading to electrical instability in the atria. *Ventricular fibrillations* - **Ventricular fibrillation** is a life-threatening arrhythmia that leads to cardiac arrest and is typically associated with **acute myocardial infarction** or severe **structural heart disease**, not commonly alcohol binge alone [3]. - While alcohol can increase the risk of other cardiac events, VF is not the primary arrhythmia directly induced by an alcohol binge [3]. *Ventricular premature contractions* - **Ventricular premature contractions (VPCs)** are common and can be triggered by various factors including stress, caffeine, and alcohol, but they are generally benign and not the most commonly reported serious arrhythmia from alcohol binge. - While an increase in VPCs might occur, they do not carry the same clinical significance or prevalence as AF in the context of acute alcohol consumption. *Atrial flutter* - **Atrial flutter** is another atrial arrhythmia that can be seen in patients with structural heart disease or hypertension, and can be precipitated by alcohol [2]. - However, **atrial fibrillation** is far more prevalent in acute alcohol-induced arrhythmias, making it a more common association than atrial flutter [1].

Q: Low QRS voltage on ECG with left ventricular hypertrophy on Echocardiography suggests a diagnosis of:

Cardiac Amyloidosis. ***Cardiac Amyloidosis*** - **Low QRS voltage** on ECG despite echocardiographic evidence of **left ventricular hypertrophy** is a classic paradox seen in cardiac amyloidosis. - Amyloid deposits infiltrate the myocardium, increasing wall thickness but **reducing electrical activity transmission**. *Cor pulmonale* - Cor pulmonale involves **right ventricular hypertrophy** due to pulmonary hypertension, not primarily left ventricular hypertrophy. - While it can cause changes in ECG findings, the combination of low QRS voltage with LVH is not characteristic. *Infective endocarditis* - Infective endocarditis primarily affects heart valves and can cause vegetations, but it does not typically lead to **left ventricular hypertrophy** or **low QRS voltage** on ECG. - ECG findings in endocarditis are often related to conduction abnormalities or ischemia if embolization occurs. *Pericardial effusion* - A significant pericardial effusion can cause **low QRS voltage** on ECG due to the dampening effect of fluid around the heart [1]. - However, it does not typically cause **left ventricular hypertrophy**; rather, it can be associated with signs of tamponade or inflammation [1].

Q: Treatment of asymptomatic bradycardia is

No treatment is required. **No treatment is required** - **Asymptomatic bradycardia** generally indicates that the heart rate, though slow, is sufficient to meet the body's metabolic demands. - Intervening in the absence of symptoms could be unnecessary and potentially introduce risks without clear benefit [2]. *Give atropine* - **Atropine** is typically used for **symptomatic bradycardia** (e.g., hypotension, altered mental status, chest pain) to increase heart rate by blocking parasympathetic action. - In an asymptomatic patient, its use is not indicated and could lead to side effects like tachycardia or urinary retention. *Isoprenaline* - **Isoprenaline** is a non-selective beta-agonist used to increase heart rate and contractility, often in severe bradycardia or heart block. - Like atropine, its use is reserved for **symptomatic bradycardia** or specific emergency situations, not for asymptomatic conditions. *Cardiac pacing* - **Cardiac pacing** (either temporary or permanent) is indicated for **symptomatic bradycardia** that is refractory to pharmacological treatment or for certain types of heart block [1]. - It is an invasive procedure and is not appropriate for a patient who is asymptomatic.

Q: Most common cause of unilateral pedal edema

Venous insufficiency. ***Venous insufficiency*** - Chronic venous insufficiency is characterized by impaired venous return, leading to **increased hydrostatic pressure** in the capillaries of the lower extremities [2]. - This increased pressure forces fluid out of the capillaries into the interstitial space, causing **unilateral edema, especially in the ankle and foot** [1], [2]. *Pregnancy* - Pregnancy typically causes **bilateral pedal edema** due to increased blood volume, venous compression by the gravid uterus, and hormonal changes. - It would not usually present as a primary cause of *unilateral* pedal edema. *Lymphedema* - Lymphedema results from impaired lymphatic drainage, leading to the **accumulation of protein-rich fluid** in the interstitial space. - While it can be unilateral and cause significant swelling, **venous insufficiency is more common** as a primary cause of unilateral pedal edema. *Milroy disease* - Milroy disease is a **rare, inherited form of primary lymphedema** that typically presents at birth or in early childhood. - It is characterized by **congenital aplasia or hypoplasia of lymphatic vessels** and is not the most common cause of unilateral pedal edema in the general population.

Q: What does a -30 to -90 degree axis deviation indicate?

Left Axis Deviation. ***Left Axis Deviation*** - A cardiac axis between **-30 and -90 degrees** is defined as **Left Axis Deviation (LAD)** [1]. - LAD is typically caused by conditions such as **left ventricular hypertrophy**, **inferior myocardial infarction**, or **left anterior fascicular block**. *Right Axis Deviation* - Right Axis Deviation generally refers to an axis between **+90 and +180 degrees**. - It is often associated with conditions like **right ventricular hypertrophy** or **left posterior fascicular block**. *Extreme Right Axis Deviation* - **Extreme Right Axis Deviation**, sometimes called "Northwest axis," indicates an axis between **-90 and -180 degrees**. - This is a rare finding, usually associated with severe conditions such as **ventricular tachycardia** or **pulmonary embolism**. *Normal Cardiac Axis* - A **normal cardiac axis** typically falls between **-30 and +90 degrees** [1]. - The given range of **-30 to -90 degrees** extends beyond the normal range, indicating an abnormal deviation.

Q: What are the potential clinical consequences of a large patent ductus arteriosus (PDA)?

All of the listed complications are potential consequences of PDA, depending on the clinical scenario.. A large **patent ductus arteriosus (PDA)** can lead to several serious clinical consequences due to the continuous left-to-right shunt. The severity and manifestation of these outcomes depend on the size of the PDA and the patient's individual response [1]. Potential complications include **congestive heart failure**, **pulmonary hypertension** progressing to **Eisenmenger syndrome**, and an increased risk of **infective endocarditis**. *Endocarditis* - The abnormal blood flow through a PDA creates **turbulent jets** that can damage the endothelial lining of the pulmonary artery or the ductus itself. - This damaged endothelium is susceptible to bacterial colonization, leading to **infective endocarditis**. *Eisenmenger syndrome* - A large PDA causes a **significant left-to-right shunt**, leading to chronic **pulmonary overcirculation** and increased pulmonary artery pressure. - Over time, this can lead to irreversible **pulmonary vascular disease** and the development of **Eisenmenger syndrome**, characterized by reversed shunt direction [1]. *Congestive heart failure (CHF)* - The continuous flow of blood from the aorta to the pulmonary artery through a large PDA increases the **volume load** on the left ventricle and the pulmonary circulation [1]. - This increased workload eventually leads to **left ventricular dilation** and dysfunction, resulting in symptoms of **congestive heart failure** such as tachypnea, poor feeding, and growth failure in infants [1].

Q: Low QRS voltage on ECG indicates ?

Pericardial effusion. ***Pericardial effusion*** - A significant **pericardial effusion** can lead to low QRS voltage on ECG because the fluid surrounding the heart acts as an electrical insulator, dampening the electrical signals [1]. - This dampening effect reduces the amplitude of the QRS complexes recorded on the electrocardiogram [1]. *Pulmonary embolism* - While pulmonary embolism can cause various ECG changes (e.g., **S1Q3T3 pattern**, right axis deviation), it typically does not directly cause low QRS voltage. - The primary hemodynamic impact is on the right side of the heart and does not involve fluid accumulation around the heart to dampen electrical signals. *Cor pulmonale* - **Cor pulmonale** is right ventricular hypertrophy secondary to lung disease; ECG usually shows signs of **right ventricular hypertrophy** (e.g., tall R waves in V1, right axis deviation). - This condition is associated with increased electrical activity in the right ventricle, generally leading to larger, not smaller, QRS complexes in relevant leads. *Infective endocarditis* - **Infective endocarditis** affects heart valves and can cause rhythm disturbances or conduction blocks due to myocardial involvement or abscess formation. - It does not directly affect the electrical conductivity of the heart in a way that would cause generalized low QRS voltage.

Question 1

Which of the following conditions is a known cause of Right Bundle Branch Block (RBBB)?

Accepted Answer

Cor pulmonale

Answer

Myocardial infarction

Answer

Normal aging process

Answer

Pulmonary embolism

Question 2

What is the Ankle-Brachial Pressure Index (ABPI) value that indicates imminent risk of necrosis?

Accepted Answer

< 0.3

Answer

< 0.6

Answer

0.3 (critical ischemia)

Answer

0.6 - 0.9 (indicates moderate arterial disease)

Question 3

The S2 heart sound is best appreciated in:

Accepted Answer

2nd right intercostal space

Answer

4th left intercostal space

Answer

5th left intercostal space

Answer

3rd left intercostal space

Question 4

Which of the following arrhythmias is most commonly associated with alcohol binge in alcoholics?

Accepted Answer

Atrial fibrillation

Answer

Ventricular fibrillations

Answer

Ventricular premature contractions

Answer

Atrial flutter

Question 5

Low QRS voltage on ECG with left ventricular hypertrophy on Echocardiography suggests a diagnosis of:

Accepted Answer

Cardiac Amyloidosis

Answer

Infective endocarditis

Answer

Cor pulmonale

Answer

Pericardial effusion

Question 6

Treatment of asymptomatic bradycardia is

Accepted Answer

No treatment is required

Answer

Give atropine

Answer

Isoprenaline

Answer

Cardiac pacing

Question 7

Most common cause of unilateral pedal edema

Accepted Answer

Venous insufficiency

Answer

Pregnancy

Answer

Lymphedema

Answer

Milroy disease

Question 8

What does a -30 to -90 degree axis deviation indicate?

Accepted Answer

Left Axis Deviation

Answer

Right Axis Deviation

Answer

Normal Cardiac Axis

Answer

Extreme Right Axis Deviation

Question 9

What are the potential clinical consequences of a large patent ductus arteriosus (PDA)?

Accepted Answer

All of the listed complications are potential consequences of PDA, depending on the clinical scenario.

Answer

Endocarditis

Answer

Eisenmenger syndrome

Answer

Congestive heart failure (CHF)

Question 10

Low QRS voltage on ECG indicates ?

Accepted Answer

Pericardial effusion

Answer

Pulmonary embolism

Answer

Cor pulmonale

Answer

Infective endocarditis

Cardiology — MCQs

Cardiology — MCQs

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