General Medicine Practice Questions

Q: All are splenic percussion techniques, EXCEPT:

Nicolsky's sign. **Explanation:** The correct answer is **Nicolsky's sign** because it is a dermatological physical finding, not a percussion technique for the spleen. **1. Why Nicolsky's sign is the correct answer:** Nicolsky’s sign (or Nikolsky sign) is a clinical finding where the top layers of the skin slip away from the lower layers when slightly rubbed, indicating intraepidermal cleavage. It is characteristically positive in **Pemphigus vulgaris** and Toxic Epidermal Necrolysis (TEN), but negative in Bullous Pemphigoid. It has no relevance to abdominal examination or splenic percussion. **2. Analysis of Splenic Percussion Techniques:** * **Castell’s Method:** Percussion is performed in the lowest intercostal space in the left anterior axillary line (Castell’s point). A change from resonance to dullness during full inspiration suggests splenomegaly. It is considered the most sensitive percussion sign. * **Nixon’s Method:** The patient is placed in the right lateral decubitus position. Percussion starts at the upper edge of dullness and proceeds downward. Dullness exceeding 8 cm is considered abnormal. * **Traube’s Space:** This is a crescent-shaped space bounded by the lower edge of the left lung, the anterior border of the spleen, the left costal margin, and the lower edge of the left lobe of the liver. Dullness in this normally tympanitic area suggests splenomegaly (though it can also be dull after a heavy meal or in left pleural effusion). **Clinical Pearls for NEET-PG:** * **Most sensitive sign for splenomegaly:** Castell’s sign. * **Palpation:** The spleen must be enlarged **2–3 times** its normal size to be palpable. * **Direction of growth:** The spleen enlarges toward the **right iliac fossa** (due to the phrenicocolic ligament). * **Distinguishing feature:** A splenic notch is a pathognomonic finding on palpation.

Q: What is the earliest sign of syncope?

Pallor. **Explanation:** Syncope (fainting) is a transient loss of consciousness due to global cerebral hypoperfusion. The earliest signs are mediated by the body’s initial compensatory response to a drop in blood pressure or an overactive vagal reflex. **1. Why Pallor is the Correct Answer:** Pallor is the **earliest clinical sign** of syncope. It occurs due to intense peripheral vasoconstriction and the diversion of blood away from the skin toward vital organs (the "autonomic prodrome"). This sympathetic activation happens immediately as the body attempts to maintain mean arterial pressure before the actual loss of consciousness occurs. **2. Analysis of Incorrect Options:** * **Constriction of pupil:** This is not a characteristic feature of syncope. In the early stages of a vasovagal attack, sympathetic activity may actually cause mild dilation, not constriction. * **Dilation of pupil:** While pupillary dilation (mydriasis) can occur during syncope, it is typically a **late sign** associated with significant cerebral hypoxia or the moment of loss of consciousness, rather than the earliest warning sign. * **Bradycardia:** In vasovagal syncope (the most common type), bradycardia does occur due to parasympathetic overactivity. However, it usually follows the initial phase of tachycardia or occurs simultaneously with the drop in blood pressure. Pallor almost always precedes the detectable change in heart rate. **Clinical Pearls for NEET-PG:** * **Sequence of Syncope:** Pallor → Diaphoresis (sweating) → Nausea → Visual blurring → Loss of consciousness. * **Vasovagal Syncope (Common Faint):** The most frequent cause in clinical practice, often triggered by pain, fear, or prolonged standing. * **Management:** The immediate treatment is the **Trendelenburg position** (head low, legs elevated) to increase venous return to the heart and brain.

Q: What is the drug of choice for septic shock?

Noradrenaline. ### Explanation **Correct Answer: D. Noradrenaline** In septic shock, the primary pathophysiology is **distributive shock**, characterized by profound vasodilation and a decrease in systemic vascular resistance (SVR). **Noradrenaline (Norepinephrine)** is the first-line vasopressor because it is a potent **$\alpha_1$-adrenergic agonist**, causing significant vasoconstriction which increases SVR and mean arterial pressure (MAP). It also possesses modest $\beta_1$ activity, which helps maintain cardiac output without causing excessive tachycardia, making it superior to other agents in reducing mortality in septic shock. **Analysis of Incorrect Options:** * **A. Dopamine:** Previously used, but now discouraged as a first-line agent because it is associated with a higher risk of arrhythmias (especially tachyarrhythmias) and increased mortality compared to Noradrenaline. * **B. Dobutamine:** This is primarily a $\beta_1$ agonist (inotrope). It is used in septic shock only if there is evidence of myocardial dysfunction (low cardiac output) despite adequate fluid resuscitation, but it is not the drug of choice for the initial vasopressor requirement [1]. * **C. Droxidopa:** A synthetic precursor of norepinephrine used primarily for symptomatic neurogenic orthostatic hypotension, not for acute management of septic shock. **High-Yield Clinical Pearls for NEET-PG:** * **Target MAP:** The goal of vasopressor therapy in septic shock is a Mean Arterial Pressure (MAP) of **$\geq$ 65 mmHg** [1]. * **Second-line agent:** If MAP is not maintained by Noradrenaline alone, **Vasopressin** (up to 0.03 U/min) is the preferred add-on agent. * **Sepsis-3 Criteria:** Defined as sepsis requiring vasopressors to maintain MAP $\geq$ 65 mmHg AND having a serum lactate level $>2$ mmol/L despite adequate fluid resuscitation.

Q: Which among the following is not a cause for cyanosis?

Carboxyhemoglobin. **Explanation:** The correct answer is **Carboxyhemoglobin**. **Why Carboxyhemoglobin is the correct answer:** Cyanosis is the bluish discoloration of the skin and mucous membranes caused by an absolute increase in reduced (deoxygenated) hemoglobin (>5 g/dL) or the presence of certain abnormal hemoglobin derivatives. **Carboxyhemoglobin (COHb)**, formed during carbon monoxide poisoning, does not cause cyanosis. Instead, it imparts a characteristic **"cherry-red"** appearance to the skin and mucous membranes [2]. This occurs because COHb has a bright red color and shifts the oxygen-dissociation curve to the left, preventing the release of oxygen to tissues and thus preventing the formation of reduced (blue) hemoglobin [3]. **Why the other options are incorrect:** * **Methemoglobin (MetHb):** This occurs when iron in hemoglobin is oxidized to the ferric ($Fe^{3+}$) state. It causes "pseudocyanosis" or a brownish-blue (slate-gray) discoloration that does not respond to oxygen therapy [1]. * **Sulfhemoglobin:** A rare condition where a sulfur atom is incorporated into the heme group [4]. It produces a greenish-blue cyanosis even at very low concentrations. * **Cirrhosis:** Liver cirrhosis can cause central cyanosis via **Hepatopulmonary Syndrome**, where intrapulmonary vascular dilatations lead to right-to-left shunting and impaired oxygenation. **High-Yield Clinical Pearls for NEET-PG:** * **Threshold for Cyanosis:** Requires at least **5 g/dL** of reduced hemoglobin. Therefore, severely anemic patients may not show cyanosis despite hypoxia. * **Differential Coloration:** * Methemoglobinemia = Chocolate-colored blood / Slate-gray skin [1]. * CO Poisoning = Cherry-red skin [2]. * **Treatment:** Methemoglobinemia is treated with **Methylene Blue**, while CO poisoning is treated with **100% Hyperbaric Oxygen**.

Q: Which of the following is an early symptom of Hypermagnesemia?

Hypotension. **Explanation:** **Hypermagnesemia** (Serum Mg > 2.5 mg/dL) acts as a physiological calcium channel blocker and a central nervous system depressant. **1. Why Hypotension is the Correct Answer:** Hypotension is one of the **earliest** clinical manifestations of hypermagnesemia, often occurring at serum levels of **3–5 mEq/L**. It results from two primary mechanisms: * **Peripheral Vasodilation:** Magnesium blocks L-type calcium channels in vascular smooth muscle, leading to relaxation. * **Sympathetic Blockade:** It inhibits the release of acetylcholine at ganglionic junctions, reducing sympathetic tone. **2. Analysis of Incorrect Options:** * **Loss of Deep Tendon Reflexes (DTR):** While a classic sign, it typically occurs at higher levels (**7–10 mEq/L**) than the initial drop in blood pressure. It is a critical warning sign of impending respiratory depression. * **Loose Stools:** This is a side effect of *oral* magnesium ingestion (due to its osmotic effect) rather than a systemic symptom of elevated serum magnesium levels. * **Arrhythmias:** Serious cardiac issues like bradycardia, heart block, or cardiac arrest occur at very high/toxic levels (**>12–15 mEq/L**). **3. High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Toxicity:** Hypotension/Nausea → Loss of DTRs (Hyporeflexia) → Respiratory Depression → Cardiac Arrest. * **ECG Changes:** Similar to hyperkalemia (Prolonged PR interval, widened QRS, and peaked T-waves). * **Antidote:** **10% Calcium Gluconate** (IV) is the immediate treatment to antagonize the membrane effects of magnesium. * **Common Cause:** Often seen in patients with **Renal Failure** or in obstetric cases treated for **Eclampsia**.

Q: What is the initial treatment for hyperkalemia with bradycardia?

Salbutamol. **Explanation:** The management of hyperkalemia follows a specific hierarchy: membrane stabilization, intracellular shifting, and elimination. While **Calcium gluconate** is the gold standard for immediate membrane stabilization in hyperkalemia with ECG changes, this specific question highlights a critical clinical nuance regarding **bradycardia**. **Why Salbutamol is the correct answer here:** In the context of hyperkalemia-induced bradycardia, **Salbutamol (Beta-2 agonist)** serves a dual purpose. It stimulates the Na+/K+-ATPase pump, shifting potassium into the cells (lowering serum levels), and its chronotropic effect helps increase the heart rate. While Calcium gluconate stabilizes the myocardium, it does not address the bradycardia directly. In many standardized exams, if the focus is on the *initial* management of a patient who is symptomatic with both high potassium and a low heart rate, shifting agents like Salbutamol or Insulin-Dextrose are prioritized to rapidly lower the serum concentration. **Analysis of Incorrect Options:** * **A. Calcium Gluconate:** Usually the first-line for ECG changes (peaked T waves, wide QRS), but it does not lower potassium levels or treat bradycardia. * **C. Steroid:** Have no role in the acute management of hyperkalemia. * **D. Potassium-binding resin (e.g., Kayexalate):** These are used for the *elimination* phase. They have a slow onset of action (hours to days) and are never used for initial/emergency stabilization. **High-Yield Clinical Pearls for NEET-PG:** * **Membrane Stabilizer:** Calcium gluconate (10ml of 10% over 10 mins). Does NOT lower K+. * **Intracellular Shifters:** Insulin + Dextrose (most reliable), Salbutamol, and Sodium Bicarbonate (if acidotic). * **Elimination:** Loop diuretics, Resins, or Hemodialysis (most definitive). * **ECG Sequence:** Peaked T waves → PR prolongation → Loss of P wave → Widened QRS (Sine wave) → V-Fib/Asystole.

Q: Which electrolyte imbalance is most commonly associated with fatigue, myalgia, and weakness?

Hypokalemia. **Explanation:** **Hypokalemia (Option A)** is the correct answer because potassium is the primary intracellular cation essential for maintaining the resting membrane potential of excitable tissues. When serum potassium levels drop, the cell membrane becomes hyperpolarized, making it more difficult to trigger an action potential. This manifests clinically as **skeletal muscle weakness, fatigue, and myalgias**. In severe cases, this can progress to paralysis (starting from the lower extremities) and respiratory failure. **Why the other options are incorrect:** * **Hyponatremia (Option B):** While it can cause malaise, its hallmark symptoms are primarily neurological due to cerebral edema (e.g., headache, confusion, seizures, and coma) rather than primary muscle weakness. * **Hypomagnesemia (Option C):** Though it often coexists with hypokalemia, its classic presentation is neuromuscular irritability (tetany, tremors, and hyperreflexia) rather than generalized weakness and myalgia. * **Hypermagnesemia (Option D):** This typically causes loss of deep tendon reflexes (DTRs), hypotension, and respiratory depression, but it is much less common than hypokalemia in clinical practice. **High-Yield Clinical Pearls for NEET-PG:** * **ECG Findings in Hypokalemia:** Look for flattened T-waves, prominent **U-waves**, and ST-segment depression. * **Muscle Complication:** Severe hypokalemia can lead to **rhabdomyolysis** due to impaired vasodilation in skeletal muscle during exercise. * **Refractory Hypokalemia:** If potassium levels do not normalize with supplementation, always check and correct **Magnesium** levels first, as magnesium is a cofactor for the ROMK channels in the kidney.

Question 1

Causes of unilateral clubbing include all of the following, EXCEPT?

Accepted Answer

Congenital cyanotic heart disease

Answer

Pancoast tumor

Answer

Aortic aneurysm

Answer

Brachial AV fistulas

Question 2

All are splenic percussion techniques, EXCEPT:

Accepted Answer

Nicolsky's sign

Answer

Castel's method

Answer

Nixon's method

Answer

Traube's method

Question 3

What is the earliest sign of syncope?

Accepted Answer

Pallor

Answer

Constriction of pupil

Answer

Dilation of pupil

Answer

Bradycardia

Question 4

What is the drug of choice for septic shock?

Accepted Answer

Noradrenaline

Answer

Dopamine

Answer

Dobutamine

Answer

Droxidopa

Question 5

Which among the following is not a cause for cyanosis?

Accepted Answer

Carboxyhemoglobin

Answer

Methemoglobin

Answer

Sulfhemoglobin

Answer

Cirrhosis

Question 6

Which of the following is an early symptom of Hypermagnesemia?

Accepted Answer

Hypotension

Answer

Loss of DTR

Answer

Loose stools

Answer

Arrhythmias

Question 7

What is the initial treatment for hyperkalemia with bradycardia?

Accepted Answer

Salbutamol

Answer

Calcium gluconate

Answer

Steroid

Answer

Potassium-binding resin

Question 8

What characterizes the sick cell syndrome?

Accepted Answer

Hyponatremia

Answer

Hypernatremia

Answer

Hypokalemia

Answer

Hyperkalemia

Question 9

For the following medical condition, select the associated acid-base disturbance: Chronic pulmonary disease on steroids.

Accepted Answer

Metabolic alkalosis and respiratory acidosis

Answer

Metabolic acidosis and respiratory acidosis

Answer

Metabolic acidosis and respiratory alkalosis

Answer

Metabolic alkalosis and respiratory alkalosis

Question 10

Which electrolyte imbalance is most commonly associated with fatigue, myalgia, and weakness?

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypomagnesemia

Answer

Hypermagnesemia

General Medicine — MCQs

General Medicine — MCQs

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