Cardiology Practice Questions

Q: A patient with chronic kidney disease (CKD) presents with tachycardia, and the ECG is recorded as shown above. What is the most likely diagnosis?

Hyperkalemia. ***Hyperkalemia*** - The ECG shows characteristic signs of **hyperkalemia**, including **peaked, tall T waves**, which are prominently visible. This is a common finding in CKD patients due to impaired potassium excretion. - The patient's history of **chronic kidney disease (CKD)** predisposes them to hyperkalemia, as the kidneys are responsible for potassium balance. *Hypokalemia* - **Hypokalemia** typically presents with flattened T waves, prominent U waves, and ST-segment depression on an ECG. These features are not seen in the provided ECG. - While CKD can sometimes be associated with hypokalemia (e.g., due to diuretic use), the ECG morphology is inconsistent with this diagnosis. *Hypercalcemia* - **Hypercalcemia** on ECG usually manifests as a **shortened QT interval**. - The ECG does not show a shortened QT interval, making hypercalcemia an unlikely diagnosis based on the cardiac findings. *Hypocalcemia* - **Hypocalcemia** is typically associated with a **prolonged QT interval** on an ECG. - The ECG does not exhibit a prolonged QT interval, ruling out hypocalcemia as the likely cause of the findings. *Hypomagnesemia* - **Hypomagnesemia** can occur in CKD patients, particularly those on diuretics or with poor nutritional intake. ECG findings typically include **prolonged QT interval**, **flattened or inverted T waves**, and **prominent U waves**. - The peaked T waves seen in this ECG are not consistent with hypomagnesemia, making this diagnosis unlikely.

Q: 30-year-old male, weighing 70 kg , presents with a serum sodium level of $120 \mathrm{mEq} / \mathrm{L}$. Calculate the total sodium deficit.

840 mEq. ***840 mEq*** - The formula for calculating **total sodium deficit** is: **(Desired Na - Actual Na) × Total Body Water (TBW)**. - In a male, TBW is approximately **60% of body weight**. For a 70 kg male, **TBW = 0.6 × 70 kg = 42 L**. - With a desired sodium of **140 mEq/L** (normal) and actual sodium of **120 mEq/L**, the total deficit is: - **(140 - 120) × 42 = 20 × 42 = 840 mEq** - This represents the **complete calculated sodium deficit** needed to restore serum sodium to normal levels. - **Note:** In clinical practice, this entire deficit is NOT replaced rapidly. Typically, only **6-12 mEq/L increase per 24 hours** is recommended to prevent **osmotic demyelination syndrome**, but the question asks for the total calculated deficit. *630 mEq* - This value represents a **partial correction target**, corresponding to raising serum sodium to approximately **135 mEq/L** instead of 140 mEq/L: (135 - 120) × 42 = 630 mEq. - Alternatively, it equals about **75% of the total deficit** (840 × 0.75 = 630). - While this may reflect a practical clinical target, it does not answer the question which asks for the **total deficit**. *420 mEq* - This corresponds to raising serum sodium by **10 mEq/L** (10 × 42 = 420 mEq). - This represents the **maximum recommended increase in the first 24 hours** to prevent complications. - It is a safe initial correction amount but not the total calculated deficit. *280 mEq* - This represents an even smaller increment, roughly equivalent to raising serum sodium by **6-7 mEq/L**. - This would be an **ultra-conservative initial correction** for chronic hyponatremia. - It significantly underestimates the total sodium deficit. *1260 mEq* - This is an **overestimation** that might result from incorrectly using 100% body weight as TBW instead of 60%: (140 - 120) × 70 = 1400 mEq (close to this range). - Or from miscalculation using wrong formula components. - This exceeds the actual total sodium deficit.

Q: A patient presents with confusion, altered mental status, and unusual behavior. On examination, CNS features such as disorientation and lethargy are noted. Laboratory results reveal a urine osmolality of 1000 mOsm/kg and a plasma osmolality of 250 mOsm/kg. What is the most likely electrolyte imbalance?

Hyponatremia. ***Hyponatremia*** - The **low plasma osmolality** (250 mOsm/kg) combined with a **high urine osmolality** (1000 mOsm/kg) indicates that the kidneys are inappropriately concentrating urine despite diluted plasma, a hallmark finding in euvolemic hyponatremia. - **Confusion**, **altered mental status**, and **unusual behavior** are classic neurological symptoms associated with hyponatremia, particularly when it develops acutely or severely. *Hypokalemia* - **Hypokalemia** is characterized by low serum potassium and can cause muscle weakness, arrhythmias, and fatigue, but it does not directly explain the given plasma and urine osmolality findings. - The neurological symptoms described are not typical primary manifestations of hypokalemia. *Hyperkalemia* - **Hyperkalemia** involves high serum potassium, commonly leading to cardiac arrhythmias and muscle weakness. - The provided **osmolality values** are not consistent with a primary diagnosis of hyperkalemia. *Hypernatremia* - **Hypernatremia** is defined by high serum sodium and would present with **high plasma osmolality**, which contradicts the given plasma osmolality of 250 mOsm/kg. - While it can cause neurological symptoms, the osmolality findings rule it out. *Hypercalcemia* - **Hypercalcemia** can present with neurological symptoms including confusion and lethargy ("stones, bones, groans, and psychiatric overtones"). - However, hypercalcemia does not produce the characteristic **low plasma osmolality with high urine osmolality** pattern seen in this case.

Q: A patient presents with breathing difficulty and generalized weakness. On auscultation, a middiastolic murmur with a prominent "a" wave is observed. What is the most likely diagnosis?

Tricuspid Stenosis (TS). ***Tricuspid Stenosis (TS)*** - A **middiastolic murmur** in the tricuspid area (usually left lower sternal border) along with a **prominent "a" wave** (due to increased right atrial pressure against a stenotic tricuspid valve) is pathognomonic for tricuspid stenosis. - The symptoms of **breathing difficulty** and **generalized weakness** can arise from reduced cardiac output and venous congestion characteristic of TS. *Mitral Regurgitation (MR)* - MR typically presents with a **holosystolic murmur** best heard at the apex and radiating to the axilla. - It does not characteristically produce a middiastolic murmur or a prominent "a" wave. *Mitral Stenosis (MS)* - MS causes a **diastolic rumble** with an **opening snap**, best heard at the apex, but it is not typically associated with a pronounced "a" wave in the jugular venous pulse unless there's associated pulmonary hypertension and right heart strain. - The murmur is usually localized to the apex, whereas tricuspid murmurs are typically heard from the lower left sternal border. *Tricuspid Regurgitation (TR)* - TR is characterized by a **holosystolic murmur** that increases with inspiration, heard at the left lower sternal border. - It typically causes a prominent **"v" wave** in the jugular venous pulse due to regurgitant flow into the right atrium, not a prominent "a" wave. *Pulmonary Stenosis (PS)* - PS presents with a **systolic ejection murmur** at the left upper sternal border (pulmonic area), not a diastolic murmur. - While it can cause right heart strain, it does not produce the characteristic middiastolic murmur or prominent "a" wave seen in tricuspid stenosis.

Q: A patient presents with breathlessness and wheezing. Absolute eosinophil count is 500 cells/ $\mu \mathrm{L}$. Chest X-ray shows a miliary pattern. What is the most likely diagnosis?

Tropical pulmonary eosinophilia. ***Tropical pulmonary eosinophilia*** - This condition is characterized by **eosinophilia** (absolute eosinophil count >500 cells/µL), **respiratory symptoms** such as breathlessness and wheezing, and a **miliary pattern** on chest X-ray, all consistent with the patient's presentation. - It results from a **hypersensitivity reaction** to microfilariae from Wuchereria bancrofti or Brugia malayi in individuals living in endemic regions. *Bronchial asthma* - While bronchial asthma can cause **breathlessness** and **wheezing**, a miliary pattern on chest X-ray is **not typical**, nor is an eosinophil count of 500 cells/µL, though eosinophilia can occur. - Asthma is primarily a disease of reversible airway obstruction, often triggered by **allergens** or irritants. *Miliary Tuberculosis (TB)* - **Miliary TB** would present with a miliary pattern on chest X-ray and breathlessness, but it is typically associated with **low or normal eosinophil counts**, and wheezing is less common. - Fever, night sweats, and weight loss are also common symptoms of Miliary TB. *Hypersensitivity pneumonitis* - This condition involves inflammation of the lung alveoli due to inhalation of organic dusts or chemicals, causing **breathlessness** and, occasionally, wheezing, but **eosinophilia is not a primary feature**. - Chest X-ray findings can be diverse, but a **miliary pattern** is less specific than for tropical pulmonary eosinophilia. *Allergic bronchopulmonary aspergillosis (ABPA)* - ABPA can present with **eosinophilia**, **wheezing**, and respiratory symptoms, but chest X-ray typically shows **central bronchiectasis** and **fleeting infiltrates** rather than a miliary pattern. - It occurs in patients with asthma or cystic fibrosis and is characterized by **hypersensitivity to Aspergillus fumigatus**.

Q: A known case of AIDS with a productive cough and fever is found to have consolidation in the right infrascapular area. Chest X-ray shows right lower lobe consolidation, and the CD4 count is 55 per microlitre. What is the most common cause of this presentation?

Streptococcus pneumoniae. ***Streptococcus pneumoniae*** - Despite severe immunocompromise (CD4 count 55), **bacterial pneumonia**, especially **Streptococcus pneumoniae**, remains the most common cause of pneumonia in patients with AIDS. - The presentation of productive cough, fever, and focal consolidation on chest X-ray (**right lower lobe consolidation**) is typical for bacterial pneumonia. *Staphylococcus aureus* - While *Staphylococcus aureus* can cause pneumonia in AIDS patients, particularly those with IV drug use or recent hospitalization, it is **less common** than *Streptococcus pneumoniae*. - *S. aureus* pneumonia often presents with **abscess formation** or **necrotizing pneumonia**, which is not explicitly mentioned. *Pneumocystis jirovecii* - *Pneumocystis jirovecii* pneumonia (PJP) is a common opportunistic infection in AIDS patients with **CD4 counts below 200**, but it typically presents with **diffuse interstitial infiltrates** or **no consolidation** on chest X-ray. - The classic presentation is **dry cough**, progressive dyspnea, and hypoxia, rather than focal consolidation and productive sputum. *Mycoplasma pneumoniae* - *Mycoplasma pneumoniae* causes **"walking pneumonia"** and is characterized by a less severe cough, **fewer systemic symptoms**, and usually **interstitial or patchy infiltrates**, not frank consolidation. - It is also **less common** in immunocompromised patients with such a low CD4 count compared to typical bacterial pathogens. *Mycobacterium tuberculosis* - While tuberculosis is an important opportunistic infection in AIDS patients with **CD4 counts below 100**, it typically presents with **chronic symptoms** (weeks to months), night sweats, weight loss, and often **upper lobe cavitary disease** or **miliary pattern** on chest X-ray. - The **acute presentation** with productive cough and **focal lobar consolidation** is more consistent with bacterial pneumonia than TB.

Q: A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?

Leukemia. ***Leukemia*** - **Benzene exposure** is a well-established risk factor for developing **leukemia**, particularly acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). - **Generalized fatigue** and **easy fatigability** are common symptoms of leukemia, resulting from anemia, bone marrow infiltration, and systemic effects of the disease. - Benzene is classified as a **Group 1 carcinogen** by IARC with strong evidence for leukemogenesis. *Aplastic Anemia* - While benzene exposure can cause **aplastic anemia** (bone marrow failure), this condition typically presents with **pancytopenia** and more severe symptoms including bleeding and infections. - However, given the occupational exposure and symptoms, **leukemia** remains the primary concern as it is more commonly associated with chronic benzene exposure. - Aplastic anemia from benzene is less common than benzene-induced leukemia. *Hepatocellular Carcinoma* - While benzene exposure can be **hepatotoxic**, it is not primarily associated with an increased risk of **Hepatocellular Carcinoma**. - Risk factors for hepatocellular carcinoma include **chronic viral hepatitis** (HBV, HCV) and **alcoholism**. *Carcinoma Gall Bladder* - There is **no significant association** between benzene exposure and the development of **gallbladder cancer**. - Risk factors for gallbladder cancer include **gallstones**, porcelain gallbladder, and chronic inflammation. *Urinary Bladder Cancer* - **Aromatic amines** and **anilines** (often found in dye, rubber, and chemical industries) are established causes of bladder cancer, not typically benzene itself. - While benzene is a carcinogen, **bladder cancer** is not considered a primary or strong association with its exposure.

Question 1

A 60-year-old lady presents with shortness of breath (SOB) and episodes of angina pectoris. Work-up reveals aortic stenosis. Which of the following is the most likely reason behind these chest pain episodes?

Accepted Answer

Increased oxygen consumption in the heart

Answer

Increased pressure in aorta

Answer

Decreased pressure in aorta

Answer

Increase in volume overload of the heart

Answer

Decreased coronary blood flow

Question 2

A patient with chronic kidney disease (CKD) presents with tachycardia, and the ECG is recorded as shown above. What is the most likely diagnosis?

Accepted Answer

Hyperkalemia

Answer

Hypokalemia

Answer

Hypercalcemia

Answer

Hypocalcemia

Answer

Hypomagnesemia

Question 3

A hypertensive patient presents with an irregularly irregular pulse and a loud P2 on auscultation. Which JVP finding is likely to be seen in this patient?

Accepted Answer

Absent a wave

Answer

Cannon a wave

Answer

Rapid $x$ descent

Answer

Rapid $y$ descent

Answer

Prominent v wave

Question 4

30-year-old male, weighing 70 kg , presents with a serum sodium level of $120 \mathrm{mEq} / \mathrm{L}$. Calculate the total sodium deficit.

Accepted Answer

840 mEq

Answer

630 mEq

Answer

280 mEq

Answer

420 mEq

Answer

1260 mEq

Question 5

A patient presents with confusion, altered mental status, and unusual behavior. On examination, CNS features such as disorientation and lethargy are noted. Laboratory results reveal a urine osmolality of 1000 mOsm/kg and a plasma osmolality of 250 mOsm/kg. What is the most likely electrolyte imbalance?

Accepted Answer

Hyponatremia

Answer

Hypokalemia

Answer

Hyperkalemia

Answer

Hypernatremia

Answer

Hypercalcemia

Question 6

A patient presents with breathing difficulty and generalized weakness. On auscultation, a middiastolic murmur with a prominent "a" wave is observed. What is the most likely diagnosis?

Accepted Answer

Tricuspid Stenosis (TS)

Answer

Mitral Regurgitation (MR)

Answer

Mitral Stenosis (MS)

Answer

Tricuspid Regurgitation (TR)

Answer

Pulmonary Stenosis (PS)

Question 7

A patient presents with breathlessness and wheezing. Absolute eosinophil count is 500 cells/ $\mu \mathrm{L}$. Chest X-ray shows a miliary pattern. What is the most likely diagnosis?

Accepted Answer

Tropical pulmonary eosinophilia

Answer

Bronchial asthma

Answer

Miliary Tuberculosis (TB)

Answer

Hypersensitivity pneumonitis

Answer

Allergic bronchopulmonary aspergillosis (ABPA)

Question 8

A 68-year-old male presents with cough, sputum production, bronchial breath sounds, respiratory rate of 20/min, urea of 44 mg/dl, and BP of 110/70 mmHg. What is the next step in management?

Accepted Answer

Room admission

Answer

Admit in ICU without mechanical ventilation (MV)

Answer

Home treatment (Rx)

Answer

Admit in ICU with mechanical ventilation (MV)

Answer

Observation in emergency department

Question 9

A known case of AIDS with a productive cough and fever is found to have consolidation in the right infrascapular area. Chest X-ray shows right lower lobe consolidation, and the CD4 count is 55 per microlitre. What is the most common cause of this presentation?

Accepted Answer

Streptococcus pneumoniae

Answer

Staphylococcus aureus

Answer

Pneumocystis jirovecii

Answer

Mycoplasma pneumoniae

Answer

Mycobacterium tuberculosis

Question 10

A patient presents with generalized and easy fatigability. He reports weakness while working in a factory with exposure to benzene. Which of the following conditions should be suspected in this patient?

Accepted Answer

Leukemia

Answer

Hepatocellular Carcinoma

Answer

Carcinoma Gall Bladder

Answer

Urinary Bladder Cancer

Answer

Aplastic Anemia

Cardiology — MCQs

Cardiology — MCQs

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