Clinical Manifestations and Presentation of Diseases Practice Questions

Q: Which of the following statements about Malar telangiectasia is FALSE?

Caused by mutations in the ABCC6 gene. **Explanation:** The correct answer is **A**, as the mutation in the **ABCC6 gene** is the underlying cause of **Pseudoxanthoma Elasticum (PXE)**, not malar telangiectasia. PXE is a systemic genetic disorder characterized by fragmented elastic fibers in the skin, eyes (angioid streaks), and cardiovascular system. **Understanding Malar Telangiectasia (Malar Flush):** Malar telangiectasia refers to the "plum-red" or violaceous discoloration of the cheeks. It is a clinical sign rather than a primary dermatological disease. * **Option B (Plum-red discoloration):** This is the classic clinical description of a malar flush. It occurs due to the dilation of superficial capillaries (telangiectasia) in the malar region. * **Option C (Carbon dioxide retention):** Chronic hypercapnia (CO2 retention), often seen in severe COPD or Type 2 respiratory failure, acts as a potent vasodilator, leading to a characteristic facial flush. * **Option D (Mitral Stenosis):** This is a high-yield association. In severe mitral stenosis, low cardiac output and pulmonary hypertension lead to peripheral cyanosis and facial vasodilation, traditionally termed the **"Mitral Facies."** **NEET-PG High-Yield Pearls:** 1. **ABCC6 Gene:** Always associate this with **Pseudoxanthoma Elasticum** (Look for "plucked chicken skin" appearance and "angioid streaks" in the retina). 2. **Malar Rash vs. Malar Flush:** Do not confuse Malar *telangiectasia* (vascular) with the Malar *rash* of SLE (inflammatory/photosensitive). The SLE rash typically spares the nasolabial folds. 3. **Differential for Facial Flushing:** Carcinoid syndrome, Rosacea, Mastocytosis, and certain drugs (Calcium channel blockers, Nitrates).

Q: Acquired proximal myopathy is NOT a feature of which of the following conditions?

Type I diabetes mellitus. The question asks to identify the condition that does **not** typically present with acquired proximal myopathy. **1. Why Type I Diabetes Mellitus is the Correct Answer:** Type I Diabetes Mellitus is primarily a metabolic disorder characterized by insulin deficiency. While it commonly causes **Diabetic Polyneuropathy** (distal sensory loss) [1] or **Diabetic Amyotrophy** (asymmetric proximal weakness with significant pain and atrophy), it does not typically present as a generalized, symmetric acquired proximal myopathy. The muscle involvement in diabetes is usually neurogenic or vascular (infarction) rather than a primary myopathic process. **2. Analysis of Incorrect Options:** * **Polymyositis:** This is the classic prototype of inflammatory acquired proximal myopathy. It presents with subacute, symmetric weakness of the pelvic and shoulder girdles. * **Hypothyroidism:** Endocrine myopathies are common. Hypothyroidism causes proximal muscle weakness, often accompanied by pseudohypertrophy (Hoffman’s syndrome in adults), delayed relaxation of deep tendon reflexes, and elevated Creatine Kinase (CK) levels. * **Addison’s Disease:** Adrenal insufficiency can lead to significant muscle weakness and fatigue. The electrolyte imbalances (hyperkalemia, hyponatremia) and glucocorticoid deficiency contribute to a proximal myopathic clinical picture. **NEET-PG High-Yield Pearls:** * **Drug-induced myopathy:** Statins, steroids, and chloroquine are common causes. * **Hoffman’s Syndrome:** Proximal myopathy + muscle stiffness + pseudohypertrophy specifically seen in **Hypothyroidism**. * **CK Levels:** CK is markedly elevated in Polymyositis and Hypothyroidism, but often **normal** in Steroid-induced myopathy. * **Diabetic Amyotrophy:** Also known as Bruns-Garland syndrome [1]; it is a lumbosacral radiculoplexus neuropathy, not a primary myopathy.

Q: Which of the following is a manifestation of hypokalemia?

Rhabdomyolysis. Hypokalemia (serum potassium <3.5 mEq/L) affects excitable tissues, including skeletal, cardiac, and smooth muscles [1]. **Why Rhabdomyolysis is correct:** Potassium plays a critical role in regulating regional blood flow to skeletal muscles during exercise. Normally, muscle contraction causes potassium release from cells, leading to vasodilation and increased blood flow. In severe hypokalemia (<2.5 mEq/L), this vasodilatory response is impaired, resulting in muscle ischemia, necrosis, and subsequent **rhabdomyolysis**. This is a classic high-yield association for NEET-PG. **Analysis of Incorrect Options:** * **A. Prominent U wave:** While a prominent U wave is a classic **ECG finding** of hypokalemia, the question asks for a **manifestation** (clinical presentation). In many clinical exams, if both a sign (ECG) and a systemic complication (Rhabdomyolysis) are present, the pathological process (Rhabdomyolysis) is prioritized as a manifestation of severe deficiency. *Note: In some contexts, A could be considered correct, but Rhabdomyolysis is the more significant clinical "manifestation" of muscle cell integrity loss.* * **C. Diarrhea:** Hypokalemia causes **decreased** gastrointestinal motility, leading to **paralytic ileus** and constipation, not diarrhea [2]. In fact, chronic diarrhea is a *cause* of hypokalemia, not a manifestation [2]. * **D. Tetany:** Tetany is a hallmark of **hypocalcemia** and **hypomagnesemia**. Hypokalemia typically causes muscle weakness and flaccid paralysis. **Clinical Pearls for NEET-PG:** * **ECG changes in Hypokalemia:** Flattening/Inversion of T waves, ST-segment depression, and prominent U waves. * **Muscle effects:** Ascending paralysis (similar to Guillain-Barré Syndrome) can occur in severe cases. * **Renal effect:** Chronic hypokalemia can lead to **Nephrogenic Diabetes Insipidus**, presenting as polyuria and polydipsia.

Q: Which one of the following statements is TRUE regarding the clinical sign being elicited?

This test helps to detect ascites.. ***This test helps to detect ascites.*** - The **fluid thrill (fluid wave) test** is a classic clinical maneuver used to detect **free fluid in the peritoneal cavity** (ascites). - It involves tapping one flank while feeling for transmitted vibrations on the opposite flank, with a hand blocking at the **midline** to prevent transmission through the abdominal wall. *This test is for eliciting shifting dullness.* - **Shifting dullness** is a separate clinical test for ascites that involves **percussion** to detect changes in the dullness-to-resonance border when the patient changes position. - The fluid thrill test relies on **palpation and transmission of vibrations** through fluid, not percussion or positional changes. *The hand on the midline below the umbilicus will feel the vibrations in patients with ascites.* - The **midline hand acts as a blocker**, not a receiver, to prevent vibrations from being transmitted through the **abdominal wall tissues**. - The **receiving hand is placed on the opposite flank** from where the tapping occurs, and this hand feels the vibrations transmitted through the ascitic fluid. *All of the above statements are true.* - Only the first statement is correct; the other statements contain **inaccurate descriptions** of the fluid thrill test technique. - This option is incorrect because it includes the **false statements** about shifting dullness and the role of the midline hand.

Q: Which of the following is a non-metabolic cause of abdominal pain?

Sickle cell anemia. **Explanation:** Abdominal pain can be broadly classified into surgical, medical (metabolic), and extra-abdominal causes. Understanding this distinction is crucial for NEET-PG to avoid unnecessary laparotomies. **Why Sickle Cell Anemia is the Correct Answer:** Sickle cell anemia is classified as a **hematologic/vascular cause** of abdominal pain, rather than a metabolic one. The pain during a "sickle cell crisis" (vaso-occlusive crisis) results from the sickling of red blood cells, leading to microvascular occlusion [3], tissue ischemia, and infarction of abdominal viscera (like the spleen or mesentery) [2]. While it is a medical cause of "acute abdomen," the underlying mechanism is mechanical and vascular. **Analysis of Incorrect Options (Metabolic Causes):** * **Diabetic Ketoacidosis (DKA):** A classic metabolic cause. Severe acidosis and electrolyte imbalances lead to ileus and gastric distension, often mimicking a surgical emergency. * **Hyperparathyroidism:** Causes "moans, stones, and abdominal groans." The metabolic derangement (Hypercalcemia) leads to constipation, peptic ulcers, and pancreatitis. * **Porphyria:** Specifically Acute Intermittent Porphyria (AIP). It is a metabolic disorder of heme biosynthesis [4] where the accumulation of precursors (ALA and PBG) causes neurotoxicity, leading to severe autonomic neuropathy [5] and abdominal pain [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Other Metabolic Causes:** Uremia, Lead poisoning, and C1 esterase inhibitor deficiency (Hereditary Angioedema). * **Rule of Thumb:** If a patient presents with severe abdominal pain but a **soft, non-tender abdomen** on palpation, always consider metabolic causes like DKA or Porphyria. * **Porphyria Triad:** Abdominal pain, neuropsychiatric symptoms, and port-wine colored urine [1].

Q: Flapping tremors occur in all EXCEPT:

Parkinsonism. **Explanation:** **Flapping tremors**, also known as **Asterixis**, is a type of negative myoclonus characterized by the sudden loss of muscle tone in the wrist extensors, leading to a "flapping" motion when the arms are extended and wrists are dorsiflexed. 1. **Why Parkinsonism is the Correct Answer:** Parkinsonism is characterized by a **resting tremor** (classic "pill-rolling" tremor) which occurs due to dopaminergic depletion in the basal ganglia [1], [2]. Asterixis, however, is a manifestation of **metabolic encephalopathy**, not a primary movement disorder like Parkinson’s. Therefore, it is not a feature of Parkinsonism. 2. **Analysis of Incorrect Options:** * **Uremic Encephalopathy (A):** Accumulation of nitrogenous waste products in renal failure interferes with cerebral metabolism, frequently causing asterixis. * **Hepatic Encephalopathy (C):** This is the most classic association. Elevated ammonia levels and false neurotransmitters disrupt cortical and subcortical function, leading to the "liver flap." * **CO2 Poisoning/Narcosis (D):** Hypercapnia (high $PaCO_2$) causes cerebral vasodilation and metabolic derangement, which commonly manifests as flapping tremors in patients with Type II respiratory failure. **Clinical Pearls for NEET-PG:** * **Mechanism:** Asterixis is caused by abnormal function of the diencephalic motor control centers, not the cerebellum. * **Other Causes:** It can also be seen in **hypomagnesemia, hypokalemia**, and certain drug toxicities (e.g., **Phenytoin**). * **Unilateral Asterixis:** If seen on only one side, it usually indicates a focal brain lesion, most commonly in the **thalamus** [3].

Question 1

Which of the following statements is true regarding digital clubbing?

Accepted Answer

Clubbing is seen in pulmonary arteriovenous fistula

Answer

Clubbing always indicates heart disease

Answer

Clubbing is common in cirrhosis of the liver

Answer

Presence of clubbing warrants a search for sickle cell disease

Question 2

Which of the following statements about weight loss is TRUE or FALSE?

Accepted Answer

Hyperthyroidism in the elderly has more prominent sympathomimetic features.

Answer

Psychiatric disorders are a major cause of involuntary weight loss.

Answer

Up to 20% of all cancer deaths are caused directly by cachexia.

Answer

Connective tissue diseases decrease metabolic demand.

Question 3

Which of the following statements about Malar telangiectasia is FALSE?

Accepted Answer

Caused by mutations in the ABCC6 gene

Answer

Characterized by plum-red discolouration of the cheeks

Answer

Associated with carbon dioxide retention

Answer

Linked to mitral stenosis

Question 4

Acquired proximal myopathy is NOT a feature of which of the following conditions?

Accepted Answer

Type I diabetes mellitus

Answer

Polymyositis

Answer

Hypothyroidism

Answer

Addison's disease

Question 5

Which of the following is a manifestation of hypokalemia?

Accepted Answer

Rhabdomyolysis

Answer

Prominent U wave

Answer

Diarrhea

Answer

Tetany

Question 6

Which of the following is NOT a cause of central cyanosis?

Accepted Answer

Congestive heart failure

Answer

Chronic Asthma

Answer

Congenital Pulmonary stenosis

Answer

Alveolar hypoventilation

Question 7

Which one of the following statements is TRUE regarding the clinical sign being elicited?

Accepted Answer

This test helps to detect ascites.

Answer

This test is for eliciting shifting dullness.

Answer

The hand on the midline below the umbilicus will feel the vibrations in patients with ascites.

Answer

All of the above statements are true.

Question 8

Which of the following statements is most appropriate?

Accepted Answer

The radial and ulnar arteries can be palpated simultaneously.

Answer

Blood pressure can be measured in both arms simultaneously.

Answer

Jugular venous pressure can be measured on the right as well as the left side.

Answer

The carotid artery can be palpated on both sides simultaneously.

Question 9

Which of the following is a non-metabolic cause of abdominal pain?

Accepted Answer

Sickle cell anemia

Answer

Diabetic ketoacidosis (DKA)

Answer

Hyperparathyroidism

Answer

Porphyria

Question 10

Flapping tremors occur in all EXCEPT:

Accepted Answer

Parkinsonism

Answer

Uremic encephalopathy

Answer

Hepatic encephalopathy

Answer

CO2 poisoning

Clinical Manifestations and Presentation of Diseases — MCQs

Clinical Manifestations and Presentation of Diseases — MCQs

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