Clinical Manifestations and Presentation of Diseases Practice Questions

Q: Haemoptysis is caused by which of the following?

All of the above. **Explanation:** Haemoptysis (expectoration of blood from the lower respiratory tract) occurs when there is a disruption of the pulmonary or bronchial vasculature. While local pulmonary pathologies (like TB or Bronchiectasis) are common [1], **systemic coagulation defects** are significant systemic causes. **1. Why "All of the Above" is correct:** The underlying medical concept here is **Alveolar Hemorrhage** or mucosal bleeding secondary to systemic coagulopathy or thrombocytopenia. * **Leukaemia (Option A):** Acute leukaemias (especially AML) lead to severe **thrombocytopenia** due to bone marrow infiltration. Low platelet counts result in mucosal bleeding, including the bronchial mucosa, leading to haemoptysis. Additionally, leukaemic infiltration of the lungs or opportunistic infections in immunocompromised states can cause bleeding. * **Haemophilia (Option B):** Though rare as an isolated symptom, patients with Haemophilia (deficiency of Factor VIII or IX) have a profound secondary hemostatic defect. Any minor trauma or underlying lung infection in these patients can lead to significant, uncontrolled intrapulmonary hemorrhage. * **Anticoagulant Therapy (Option C):** Drugs like Warfarin, Heparin, or DOACs increase the bleeding diathesis. Over-anticoagulation (high INR) is a well-documented cause of diffuse alveolar hemorrhage, even in the absence of structural lung disease. **Clinical Pearls for NEET-PG:** * **Most common cause of haemoptysis in India:** Tuberculosis. * **Most common cause of massive haemoptysis:** Bronchiectasis (due to eroded hypertrophied bronchial arteries) [1]. * **Massive Haemoptysis Definition:** Expectoration of >300–600 ml of blood within 24 hours. * **Initial Investigation of choice:** Chest X-ray [2]; however, **HRCT** is more sensitive for localized lesions, and **Bronchoscopy** is vital for identifying the site of active bleeding.

Q: The best investigation for the diagnosis of amyloidosis is:

Rectal biopsy. The diagnosis of **amyloidosis** requires histological demonstration of amyloid fibrils in tissue samples. Amyloid is an extracellular proteinaceous deposit that shows characteristic **apple-green birefringence** under polarized light when stained with **Congo red** [1]. **Why Rectal Biopsy is the Correct Answer:** Rectal biopsy is historically considered a "gold standard" screening procedure for systemic amyloidosis because the submucosal venous plexus of the rectum is a frequent site for amyloid deposition. It has a high diagnostic yield (approximately **75-80%**) and is relatively safe. While **Abdominal Fat Pad Aspiration** is now often the preferred initial step due to its non-invasive nature, among the provided options, rectal biopsy remains the most definitive and established diagnostic investigation. **Analysis of Incorrect Options:** * **A & C (Colonoscopy & Upper GI Endoscopy):** While amyloid can involve any part of the GI tract, these procedures are primarily used to visualize mucosal lesions. Biopsies taken during these procedures can diagnose amyloid, but they are not the "best" or first-line screening investigations compared to the simpler rectal biopsy. * **D (CT Scan):** Imaging modalities like CT scans are non-specific. They may show organomegaly (e.g., hepatosplenomegaly) or bowel wall thickening but cannot confirm the presence of amyloid fibrils. **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive initial screening:** Fine Needle Aspiration (FNA) of Abdominal Fat Pad (yield ~80%). * **Most definitive diagnosis:** Biopsy of the involved organ (e.g., Kidney or Heart), though this carries a higher risk of bleeding. * **Stain of choice:** Congo Red. * **Pathognomonic finding:** Apple-green birefringence under polarized light. * **Cardiac Amyloidosis:** Best non-invasive test is Cardiac MRI (Late Gadolinium Enhancement) or Technetium (99mTc-PYP) scan.

Q: Paroxysmal hypotension is seen in which of the following conditions?

Carcinoid syndrome. **Explanation:** **Carcinoid syndrome** is the correct answer because it is characterized by the systemic release of vasoactive substances, primarily **serotonin, bradykinins, and histamine**, from neuroendocrine tumors (usually after metastasizing to the liver) [1]. While serotonin typically causes vasoconstriction, the release of **bradykinins and prostaglandins** leads to profound peripheral vasodilation. This results in the classic clinical triad of cutaneous flushing, diarrhea, and **paroxysmal hypotension** [1]. In some cases, severe episodes can lead to a "carcinoid crisis," a life-threatening state of profound hypotension. **Why the other options are incorrect:** * **Lymphoma & Leukemia:** These hematological malignancies typically present with constitutional symptoms (B-symptoms) like fever, night sweats, and weight loss. While they can cause hypotension in the context of sepsis or superior vena cava syndrome, they do not cause paroxysmal episodes mediated by vasoactive amines. * **Infectious Mononucleosis:** Caused by the Epstein-Barr virus (EBV), this presents with the triad of fever, pharyngitis, and lymphadenopathy. Hypotension is not a characteristic feature unless complicated by splenic rupture or rare secondary infections. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnosis:** The best initial screening test is **24-hour urinary 5-HIAA** (a metabolite of serotonin). * **Localization:** Somatostatin receptor scintigraphy (**OctreoScan**) is the gold standard for locating the primary tumor. * **Management:** **Octreotide** (a somatostatin analog) is the drug of choice to manage symptoms and prevent carcinoid crisis during surgery. * **Cardiac Involvement:** Look for **Hedinger syndrome** (fibrosis of the right-sided heart valves, specifically tricuspid regurgitation and pulmonary stenosis).

Q: Flapping tremor is seen in all except:

Thyrotoxicosis. Explanation: Flapping tremor, also known as **Asterixis**, is a form 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. It is a hallmark of **metabolic encephalopathies**. **Why Thyrotoxicosis is the correct answer:** Thyrotoxicosis (Hyperthyroidism) is associated with a **fine, rapid, rhythmic intention tremor** (high frequency, low amplitude). This is a positive tremor caused by heightened sympathetic activity and beta-adrenergic stimulation. It is *not* a negative myoclonus like asterixis. **Analysis of other options:** * **Wilson Disease:** Asterixis is a common neurological manifestation of Wilson disease due to copper deposition in the basal ganglia and associated hepatic failure (Hepatolenticular degeneration). * **Uraemia:** Accumulation of nitrogenous waste products in renal failure leads to uremic encephalopathy, a classic cause of flapping tremors. * **CO2 Narcosis:** Hypercapnia (seen in Type 2 Respiratory Failure) causes cerebral vasodilation and metabolic derangement, leading to asterixis. **High-Yield Clinical Pearls for NEET-PG:** * **Common Causes of Asterixis:** Hepatic encephalopathy (most common), Uremia, CO2 narcosis, and certain drug toxicities (e.g., Phenytoin). * **Unilateral Asterixis:** Usually suggests a focal structural brain lesion, most commonly in the **thalamus**. * **Mechanism:** It is caused by an intermittent lapse in the posture-maintaining signals from the brain to the muscles, specifically involving the abnormal function of the **vestibulospinal and reticulospinal tracts**.

Q: All are true about syncope except:

Return of consciousness is slow and takes hours. ### Explanation Syncope is defined as a transient, self-limited loss of consciousness (TLOC) due to acute global cerebral hypoperfusion. [2] It is characterized by a rapid onset, short duration, and **spontaneous, complete recovery.** [1] **Why Option D is the Correct Answer (The False Statement):** The hallmark of syncope is its **rapid recovery**. Once the patient is horizontal and cerebral blood flow is restored, consciousness returns almost immediately (usually within seconds to a few minutes). [3] If the return of consciousness is slow, takes hours, or is followed by a prolonged post-ictal state (confusion/drowsiness), the diagnosis is more likely to be a **seizure** or a metabolic derangement rather than syncope. [1], [3] **Analysis of Other Options:** * **Option A (Consciousness is lost):** By definition, syncope involves a loss of consciousness and postural tone. [2] * **Option B (More common in standing):** Most types of syncope (vasovagal, orthostatic) occur while standing or sitting because gravity causes blood to pool in the lower extremities, reducing venous return. [3] Syncope occurring while **lying down** is a "red flag" for cardiac arrhythmias. * **Option C (Vasovagal type is common):** Vasovagal syncope (the common faint) is the most frequent cause of syncope across all age groups. **NEET-PG High-Yield Pearls:** * **Prodrome:** Vasovagal syncope is often preceded by autonomic symptoms (nausea, pallor, sweating). [1] * **Convulsive Syncope:** Brief myoclonic jerks can occur during syncope due to cerebral hypoxia; these are often mistaken for epilepsy but lack a post-ictal phase. * **Red Flags:** Syncope during exercise, while supine, or associated with palpitations/chest pain suggests a **cardiac etiology** (high mortality risk). * **Gold Standard Investigation:** For unexplained recurrent syncope, an **Internal Loop Recorder (ILR)** is often the most high-yield diagnostic tool.

Q: Digital clubbing is seen in all conditions except:

Pulmonary arteriovenous fistula. Digital clubbing is a clinical sign characterized by the bulbous enlargement of the distal phalanges and loss of the Schamroth window. It is primarily associated with chronic hypoxia, intrathoracic malignancies, and chronic inflammatory conditions. [1] **Why the Answer is Pulmonary Arteriovenous (AV) Fistula:** There appears to be a discrepancy in the provided key. In standard medical literature, **Pulmonary AV Fistulas** (seen in Osler-Weber-Rendu syndrome) cause significant right-to-left shunting and chronic hypoxemia, making them a **classic cause** of digital clubbing. Conversely, **Aortic Dissection** is an acute vascular emergency involving a tear in the aortic wall; it does not cause the chronic physiological changes (like increased PGE2 or PDGF bypass of the lungs) required to produce clubbing. Therefore, **Option D (Aortic Dissection)** is the condition where clubbing is NOT seen. **Analysis of Other Options:** * **Endocarditis (Option A):** Subacute bacterial endocarditis is a well-known cardiovascular cause of clubbing due to chronic inflammation and micro-emboli. [1] * **Tricuspid Atresia (Option C):** This is a cyanotic congenital heart disease. Any condition causing a right-to-left shunt allows megakaryocytes to bypass the pulmonary capillary bed and enter systemic circulation, releasing growth factors (PDGF) in the fingertips, leading to clubbing. [1] **NEET-PG High-Yield Pearls:** * **Unilateral Clubbing:** Seen in axillary artery aneurysms or brachial plexus tumors. * **Differential Clubbing (Feet > Hands):** Pathognomonic for PDA with reversal of shunt (Eisenmenger syndrome). * **Most Common Cause:** Lung cancer (specifically Non-Small Cell Lung Cancer) is the most common cause of acquired clubbing. [1] * **Note on COPD:** Simple COPD **does not** cause clubbing. If clubbing is present in a COPD patient, look for underlying bronchogenic carcinoma or bronchiectasis.

Q: What is the diagnosis in this patient with abdominal pain?

Lead poisoning. ***Lead poisoning*** - Presents with **lead colic** (severe abdominal pain) along with **basophilic stippling** on blood smear and **Burton's lines** (blue-black gum line). - Associated with **wrist drop** or **foot drop** due to peripheral neuropathy and **microcytic anemia** from inhibited heme synthesis. *Amyloidosis* - Typically presents with **systemic organ involvement** including heart, kidneys, and liver, not isolated abdominal pain. - Diagnosed by **Congo red staining** showing apple-green birefringence and **elevated serum amyloid A** levels. *Familial Mediterranean fever* - Characterized by **recurrent episodic fever** with **serositis** (peritonitis, pleuritis) in patients of **Mediterranean ancestry**. - Episodes are **self-limiting** (lasting 1-3 days) and associated with **elevated acute phase reactants** during attacks. *Leukemia* - Abdominal pain in leukemia is usually due to **hepatosplenomegaly** or **tumor lysis syndrome**, not primary presentation. - Key features include **pancytopenia**, **blast cells** on blood smear, and **lymphadenopathy** with systemic symptoms.

Question 1

Which of the following is not a potential etiology of peripheral cyanosis?

Accepted Answer

Methemoglobinemia

Answer

Cold exposure

Answer

Deep venous thrombosis

Answer

Peripheral vascular disease

Question 2

Which granulomatous condition is associated with hypercalcemia?

Accepted Answer

Systemic Lupus Erythematosus

Answer

Tuberculosis

Answer

Sarcoidosis

Answer

Berylliosis

Question 3

Haemoptysis is caused by which of the following?

Accepted Answer

All of the above

Answer

Leukaemia

Answer

Haemophilia

Answer

Anticoagulant therapy

Question 4

A 55-year-old male presents with a history of hand swelling and shortness of breath. On examination, facial plethora and distended neck veins were noted. Which is the most probable structure involved to cause these symptoms?

Accepted Answer

Superior vena cava obstruction

Answer

Pulmonary embolism

Answer

Congestive heart failure

Answer

Pneumonia

Question 5

The best investigation for the diagnosis of amyloidosis is:

Accepted Answer

Rectal biopsy

Answer

Colonoscopy

Answer

Upper GI endoscopy

Answer

CT scan

Question 6

Paroxysmal hypotension is seen in which of the following conditions?

Accepted Answer

Carcinoid syndrome

Answer

Lymphoma

Answer

Leukemia

Answer

Infectious mononucleosis

Question 7

Flapping tremor is seen in all except:

Accepted Answer

Thyrotoxicosis

Answer

Wilson disease

Answer

Uraemia

Answer

CO2 narcosis

Question 8

All are true about syncope except:

Accepted Answer

Return of consciousness is slow and takes hours

Answer

Consciousness is lost

Answer

More common in standing than lying position

Answer

Vasovagal type is common

Question 9

Digital clubbing is seen in all conditions except:

Accepted Answer

Pulmonary arteriovenous fistula

Answer

Endocarditis

Answer

Tricuspid atresia

Answer

Aortic dissection

Question 10

What is the diagnosis in this patient with abdominal pain?

Accepted Answer

Lead poisoning

Answer

Amyloidosis

Answer

Familial Mediterranean fever

Answer

Leukemia

Clinical Manifestations and Presentation of Diseases — MCQs

Clinical Manifestations and Presentation of Diseases — MCQs

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