Acute Inflammation: Vascular Events Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Acute Inflammation: Vascular Events. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Acute Inflammation: Vascular Events Indian Medical PG Question 1: A decrease in which of the following is the most likely cause of peripheral edema in a patient with long-term alcoholism and liver disease?
- A. Interstitial colloid osmotic pressure
- B. Interstitial hydrostatic pressure
- C. Capillary hydrostatic pressure
- D. Plasma colloid osmotic pressure (Correct Answer)
Acute Inflammation: Vascular Events Explanation: ***Plasma colloid osmotic pressure***
- **Liver disease** leads to decreased synthesis of **albumin**, the primary protein responsible for maintaining **plasma colloid osmotic pressure** [2].
- A reduction in this pressure allows fluid to extravasate from the capillaries into the interstitial space, causing **edema** [1], [3].
*Interstitial colloid osmotic pressure*
- An increase, rather than a decrease, in interstitial colloid osmotic pressure would pull more fluid into the interstitial space, contributing to edema.
- However, in liver disease with reduced albumin production, the primary issue is reduced plasma, not interstitial, colloid osmotic pressure [4].
*Interstitial hydrostatic pressure*
- An increase in interstitial hydrostatic pressure would tend to drive fluid back into the capillaries, thus *reducing* edema.
- A decrease would allow more fluid to accumulate in the interstitium, but this is not the primary mechanism in liver disease-related edema.
*Capillary hydrostatic pressure*
- An increase in **capillary hydrostatic pressure** can cause edema (e.g., in heart failure) [1].
- While liver disease can lead to conditions like **portal hypertension** (an increase in pressure within the portal venous system), this primarily causes ascites and not directly peripheral edema, which is more directly linked to decreased plasma colloid osmotic pressure [4].
Acute Inflammation: Vascular Events Indian Medical PG Question 2: First mediator of inflammation to be released is
- A. Nitric oxide
- B. PAF
- C. Histamine (Correct Answer)
- D. IL-1
Acute Inflammation: Vascular Events Explanation: ***Histamine***
- Histamine is the **first mediator of inflammation released** by mast cells and basophils during an allergic or inflammatory response [1][3].
- It promotes **vasodilation** and increased vascular permeability, leading to typical symptoms of inflammation [1][2].
*PAF*
- Platelet-activating factor (PAF) is released later in the inflammatory process and is primarily involved in **amplifying** the response rather than initiating it.
- It plays a role in **platelet aggregation** and acting on vascular smooth muscle but is not the first released mediator.
*Nitric oxide*
- Nitric oxide is produced by endothelial cells and plays a role in **vascular relaxation and inflammation**, but it is not among the first mediators released.
- It is involved in more **regulatory functions** in the inflammatory response rather than the initial trigger.
*IL-1*
- Interleukin-1 (IL-1) is a cytokine that is important for the **inflammatory response**, but it is produced after the initial release of mediators like histamine [2].
- It is primarily secreted by **activated macrophages** and contributes to the **amplification** of the immune response [2].
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 84-85.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 101.
[3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 93-94.
Acute Inflammation: Vascular Events Indian Medical PG Question 3: In acute inflammation, due to the contraction of the endothelial cell cytoskeleton, which of the following occurs?
- A. Early transient increase in permeability (Correct Answer)
- B. Early permanent increase in permeability
- C. Delayed permanent increase in permeability
- D. Delayed transient increase in permeability
Acute Inflammation: Vascular Events Explanation: ***Early transient increase in permeability***
- During acute inflammation, the **contraction of the endothelial cell cytoskeleton** leads to a rapid and temporary increase in vascular permeability [1].
- This process allows for the **exudation of fluid and plasma proteins** [1][2], contributing to the inflammatory response.
*Early permanent increase in permeability*
- Permanent changes in permeability do not occur early; they typically result from **severe injury** or prolonged inflammation.
- Early events in inflammation are characterized by a **transient** rather than a permanent change [1].
*Delayed permanent increase in permeability*
- Delayed permeability increases occur later in the inflammatory process due to **endothelial cell injury**, not the initial contraction.
- This concept relates to more chronic inflammatory processes rather than **acute inflammation**.
*Delayed transient increase in permeability*
- Delayed transient increases are not typical and **can lead to confusion** regarding cellular responses in acute vs. chronic inflammation.
- This oes not accurately represent the **initial response** during acute inflammation.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 187-188.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 84-85.
Acute Inflammation: Vascular Events Indian Medical PG Question 4: Pleural effusion in rheumatoid arthritis is typically associated with the following features except
- A. Glucose > 60 mg/dl (Correct Answer)
- B. Protein > 3 gm/dl
- C. Pleural fluid LDH to serum LDH ratio of >0.6
- D. Pleural fluid protein to serum protein ratio of >0.5
Acute Inflammation: Vascular Events Explanation: ***Glucose > 60 mg/dl***
- Pleural effusions in rheumatoid arthritis are typically characterized by **low glucose levels** (< 30 mg/dL), often due to increased cellular metabolism within the pleural space.
- Therefore, a glucose level greater than 60 mg/dL would be an **atypical finding** for a rheumatoid pleural effusion.
*Protein > 3 gm/dl*
- Rheumatoid pleural effusions are generally **exudative**, meaning they have high protein content, typically greater than 3.0 g/dL.
- This high protein level reflects increased capillary permeability and inflammation characteristic of rheumatoid disease.
*Pleural fluid LDH to serum LDH ratio of >0.6*
- An LDH ratio of pleural fluid to serum greater than 0.6 is a key criterion for an **exudative effusion** based on Light's criteria.
- Rheumatoid effusions are almost always exudative, consistent with this elevated LDH ratio.
*Pleural fluid protein to serum protein ratio of >0.5*
- A pleural fluid protein to serum protein ratio greater than 0.5 also indicates an **exudative effusion**, as per Light's criteria.
- This finding is common in rheumatoid pleural effusions due to increased protein leakage into the pleural space from inflammation [1].
Acute Inflammation: Vascular Events Indian Medical PG Question 5: Vasodilation in acute inflammation is first shown by which blood vessels?
- A. Venules
- B. Arterioles (Correct Answer)
- C. Capillaries
- D. Veins
Acute Inflammation: Vascular Events Explanation: ***Arterioles***
- **Arterioles** are the primary sites of **vasodilation** in acute inflammation [1][2], allowing increased blood flow to affected tissues.
- They respond rapidly to inflammatory mediators, leading to **decreased vascular resistance** and subsequent hyperemia.
*Vein*
- While veins can undergo changes in response to inflammation, they typically do not initiate **vasodilation** during acute inflammatory responses.
- Their primary role is in **draining blood**, rather than altering flow dynamics significantly in acute conditions.
*Capillaries*
- Capillaries are where **exudate** occurs, but they do not initiate vasodilation; they primarily facilitate the **exchange** of fluids and nutrients.
- Their diameter remains relatively constant; changes primarily occur in arterioles before affecting capillary perfusion.
*Venules*
- Venules primarily function as sites for **exudation** and are influenced by the arteriolar changes that precede their dilation.
- They play a role in **collecting blood** but do not exhibit initial vasodilatory responses during acute inflammation.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 185-186.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 101.
Acute Inflammation: Vascular Events Indian Medical PG Question 6: Which of the following is/are characteristic features of chronic inflammation?
- A. Infiltration of neutrophils
- B. Tissue fibrosis and lymphocyte infiltration (Correct Answer)
- C. Increased blood flow (hyperemia)
- D. Presence of fluid accumulation (edema) in tissues
Acute Inflammation: Vascular Events Explanation: ***Tissue fibrosis and lymphocyte infiltration***
- **Chronic inflammation** is characterized by the persistent presence of lymphocytes, plasma cells, and macrophages as the predominant inflammatory cells [1].
- **Tissue fibrosis** (scarring) and destruction are hallmarks of chronic inflammation as the body attempts to repair ongoing damage, often leading to loss of organ function [1].
*Infiltration of neutrophils*
- **Neutrophils** are the primary inflammatory cells seen in **acute inflammation**, being the first responders to injury or infection [2].
- Their presence typically signifies an active, recent inflammatory process, usually resolving within hours to days.
*Increased blood flow (hyperemia)*
- **Hyperemia** is a classic sign of **acute inflammation**, contributing to the **redness and warmth** observed at the site.
- While some vascular changes can persist in chronic inflammation, pronounced and primary hyperemia is characteristic of the acute phase.
*Presence of fluid accumulation (edema) in tissues*
- **Edema** primarily results from increased vascular permeability, a key feature of **acute inflammation**, causing swelling [2].
- While some edema may be present in chronic inflammation due to persistent vascular leakage, it is a dominant feature of acute inflammatory responses.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 109-110.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 103-104.
Acute Inflammation: Vascular Events Indian Medical PG Question 7: All are vasodilators except –
- A. Lidocaine
- B. Procaine
- C. Bupivacaine
- D. Cocaine (Correct Answer)
Acute Inflammation: Vascular Events Explanation: ***Cocaine***
- Cocaine is unique among local anesthetics because it causes **vasoconstriction** rather than vasodilation.
- This vasoconstrictive effect is due to its blocking of **norepinephrine reuptake** at adrenergic nerve terminals, leading to an accumulation of norepinephrine and subsequent adrenergic stimulation.
*Lidocaine*
- Lidocaine is a common **amide-type local anesthetic** known for its vasodilatory properties that contribute to its systemic absorption.
- Its vasodilatory effect can lead to a **flushing** sensation and increased blood flow in the area of injection.
*Procaine*
- Procaine is an **ester-type local anesthetic** that causes vasodilation, which results in a relatively short duration of action.
- This vasodilation increases **local blood flow**, speeding up the systemic absorption and metabolism of the drug.
*Bupivacaine*
- Bupivacaine is an **amide-type local anesthetic** with longer duration of action compared to lidocaine, and like most local anesthetics, it causes vasodilation.
- The vasodilatory effect of bupivacaine can lead to increased **systemic absorption** and potential for systemic toxicity if not managed carefully.
Acute Inflammation: Vascular Events Indian Medical PG Question 8: Which protein primarily contributes to oncotic pressure in the blood?
- A. Albumin (Correct Answer)
- B. Globulins
- C. Fibrinogen
- D. Transferrin
Acute Inflammation: Vascular Events Explanation: ***Albumin***
- **Albumin** is the most abundant plasma protein and its small size and high concentration make it the primary determinant of **oncotic pressure** in the blood.
- Its presence in the capillaries draws water from the **interstitial space** back into the blood vessels, maintaining **fluid balance** and blood volume.
*Fibrinogen*
- **Fibrinogen** is a crucial protein involved in **blood clotting**, where it is converted into **fibrin** to form a clot.
- While a plasma protein, its contribution to **oncotic pressure** is minor compared to albumin, as it's less abundant and larger in size.
*Globulins*
- **Globulins** are a diverse group of proteins involved in immune function (**immunoglobulins**), transport (e.g., **alpha** and **beta globulins**), and clotting.
- While they contribute to total plasma protein concentration, their collective impact on **oncotic pressure** is secondary to that of albumin due to lower concentrations and varied molecular weights.
*Transferrin*
- **Transferrin** is a specific **beta-globulin** that plays a vital role in **iron transport** in the blood.
- Its primary function is not related to **oncotic pressure**, and its concentration is significantly lower than albumin.
Acute Inflammation: Vascular Events Indian Medical PG Question 9: Increased vascular permeability in acute inflammation is due to what?
- A. Histamine (Correct Answer)
- B. IL-2
- C. TGF-β
- D. FGF-2
Acute Inflammation: Vascular Events Explanation: ***Histamine***
- Histamine is a key **mediator** released during acute inflammation that causes **increased vascular permeability** by inducing **contraction of endothelial cells** [1][2].
- Its release contributes to the hallmark signs of inflammation, including **swelling** and **redness** [2].
*IL 2*
- IL 2 primarily functions as a **growth factor** for T cells, not directly influencing vascular permeability in acute inflammation.
- It is more involved in the **adaptive immune response** rather than in the acute phase of inflammation.
*TGF beta*
- TGF beta is primarily involved in **fibrosis** and **tissue repair** and does not play a direct role in increasing vascular permeability during acute phases.
- It acts more as an **anti-inflammatory** cytokine rather than a pro-inflammatory mediator.
*FGF*
- Fibroblast growth factor (FGF) is mainly involved in **angiogenesis** and wound healing rather than direct modulation of vascular permeability during acute inflammation.
- It does not contribute to **edema formation** associated with acute inflammatory responses.
**References:**
[1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 187-188.
[2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 101.
Acute Inflammation: Vascular Events Indian Medical PG Question 10: Which of the following statements about C-reactive protein (CRP) is true?
- A. It is detected by agglutination test.
- B. It is raised in acute pneumococcal infection. (Correct Answer)
- C. It is an antibody.
- D. It is detected by precipitation with carbohydrate.
Acute Inflammation: Vascular Events Explanation: ***It is raised in acute pneumococcal infection.***
- **C-reactive protein (CRP)** is an **acute-phase reactant** whose levels rise rapidly and significantly in response to inflammation and infection [1].
- **Pneumococcal infection** (e.g., pneumonia) is an acute bacterial infection that triggers a strong inflammatory response, leading to increased CRP synthesis by the liver [1].
*It is detected by agglutination test.*
- While some tests for CRP can involve **agglutination assays**, this statement describes a method of detection rather than a fundamental property or primary clinical utility of CRP itself.
- CRP is more commonly quantified via methods like **nephelometry** or **turbidimetry** in modern laboratories due to their higher sensitivity.
*It is an antibody.*
- **CRP** is a **pentameric protein** produced by the liver, belonging to the **pentraxin family** of proteins.
- It functions as a non-specific innate immune molecule, primarily involved in binding to damaged cells and pathogens to facilitate their clearance, but it does **not possess antigen-specific binding** characteristic of antibodies.
*It is detected by precipitation with carbohydrate.*
- **CRP** was originally named for its ability to precipitate the **C-polysaccharide** of *Streptococcus pneumoniae*.
- However, this historical observation describes a specific interaction rather than the general method by which CRP is clinically detected or its primary biological function.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 109-111.
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