Inflammation and Repair Practice Questions

Q: Hypertrophic scar is characterized by the following, except

it outgrows the wound area. ***it outgrows the wound area*** - This statement is characteristic of a **keloid scar**, not a hypertrophic scar. Keloids are distinguished by their growth beyond the original wound margins [1]. - **Hypertrophic scars**, on the other hand, remain confined within the boundaries of the original injury, though they may be raised and erythematous [1]. *it involves the flexor surface* - While hypertrophic scars can occur on any body surface, they are commonly found on areas of **high tension**, such as the **flexor surfaces** of joints (e.g., knee, elbow) or the chest and shoulders. - This involvement is due to constant movement stretching the healing skin, which can stimulate excessive collagen production. *it is non-familial* - Hypertrophic scars are generally **not associated with a strong genetic predisposition** or familial inheritance patterns. - Their development is primarily linked to factors like wound tension, infection, and individual healing responses rather than inherited tendencies. *it is not related to the race* - The incidence of hypertrophic scars does **not show a significant racial predilection**, unlike keloid scars, which are more common in individuals with darker skin types. - Hypertrophic scars can affect individuals from all racial backgrounds. **References:** [1] Kumar v, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 119-121.

Q: Which of the following factors is labelled as cytokine in the pathogenesis of Systemic Inflammatory Response Syndrome (SIRS)?

Tumor necrosis factor. ***Tumor necrosis factor*** - **Tumor necrosis factor (TNF-α)** is a prominent pro-inflammatory cytokine and a key mediator in the pathogenesis of **Systemic Inflammatory Response Syndrome (SIRS)** [1]. - It plays a crucial role in initiating and amplifying the inflammatory cascade, leading to systemic effects like fever, increased vascular permeability, and tissue damage [1]. *Leukotrienes* - **Leukotrienes** are lipid mediators derived from arachidonic acid, involved in inflammation and allergic reactions [1]. - They are not classified as **cytokines**, which are protein signaling molecules [1]. *Nitric oxide* - **Nitric oxide (NO)** is a gaseous signaling molecule with various physiological roles, including vasodilation and neurotransmission. - While it contributes to the pathophysiology of SIRS, particularly in regulating vascular tone, it is not a **cytokine**. *Complements* - **Complements** are a system of plasma proteins that are part of the innate immune response, helping to clear pathogens [1]. - They participate in inflammation but are distinct from **cytokines**, which are regulatory proteins [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 93-101.

Q: What mechanism explains the pathogenesis of Jarisch-Herxheimer reaction in patients treated for syphilis?

Inflammatory response to rapid spirochete lysis. The Jarisch-Herxheimer reaction (JHR) is primarily caused by the rapid destruction of a large number of spirochetes, leading to the release of lipoproteins and other antigenic substances. This release triggers an acute systemic inflammatory response, manifesting as fever, chills, headache, and myalgias. While bacteria do release toxins, Treponema pallidum, the causative agent of syphilis, is a spirochete and does not produce classical endotoxins (which are typically associated with gram-negative bacteria) [1]. The inflammatory mediators are released from the host in response to the rapid breakdown of the spirochetes themselves, not pre-formed endotoxins. JHR is an acute reaction that occurs shortly after the initiation of antibiotic therapy and resolves spontaneously, which is not characteristic of a prolonged autoimmune disease. There is no evidence to suggest that the body produces antibodies against its own tissues as a result of syphilis treatment in JHR. An allergic reaction to penicillin would typically present with hives, pruritus, bronchospasm, or anaphylaxis, and would persist with repeated doses of the drug. The Jarisch-Herxheimer reaction is distinct from an allergic reaction; it is a predictable inflammatory response to spirochete killing and can occur even with non-penicillin therapies for syphilis. **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. 63-64.

Q: A male patient is not responding to oxygen therapy and has been diagnosed with ARDS (Acute Respiratory Distress Syndrome). What is the role of IL-8 in ARDS?

Recruitment of neutrophils. Recruitment of neutrophils - **Interleukin-8 (IL-8)**, also known as **CXCL8**, is a powerful **chemotactic cytokine** that primarily attracts and activates neutrophils [3]. - In **ARDS**, this recruitment leads to an influx of neutrophils into the pulmonary interstitium and alveolar spaces, contributing to inflammation and lung injury [1]. *Endothelial cell activation* - While other **cytokines** and inflammatory mediators can activate **endothelial cells** in ARDS [2], IL-8's primary role is not direct endothelial activation but rather **neutrophil chemotaxis** [3]. - **Endothelial cell activation** leads to increased vascular permeability and leukocyte adherence, which is often a consequence of overall inflammation, not solely IL-8 [4]. *Macrophage activation* - **Macrophages** are activated by various stimuli and other **cytokines**, such as **TNF-alpha** and **IFN-gamma**, as part of the inflammatory response. - While macrophages produce IL-8, its main function is not to activate macrophages themselves but to attract **neutrophils**. *Promote surfactant production* - **Surfactant production** is primarily regulated by **Type II pneumocytes** and is often impaired in ARDS due to damage to these cells [1]. - IL-8 is a **pro-inflammatory cytokine** and plays no direct role in promoting surfactant synthesis; in fact, its inflammatory effects can indirectly worsen surfactant dysfunction. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 681. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 679. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Migration in the tissues toward a chemotactic stimulus, pp. 86-87.

Q: Arrange the following cellular events of inflammation in the correct sequence: 1. Rolling 2. Cytokine-mediated integrin activation 3. Adhesion 4. Migration

1,2,3,4. ***1,2,3,4*** - The correct sequence of cellular events for leukocyte recruitment during inflammation begins with **rolling** [1], followed by **cytokine-mediated integrin activation** [2], then firm **adhesion** to the endothelium [1], and finally **migration** (diapedesis) into the tissues [3]. - This step-by-step process ensures effective targeting of leukocytes to the site of injury or infection [1]. *3,4,1,2* - This sequence is incorrect as **adhesion** cannot occur before **rolling**, and **migration** is the final step after adhesion, not an early one. - **Cytokine-mediated integrin activation** must precede firm adhesion [1]. *2,1,4,3* - This order is incorrect because **rolling** (1) is the initial interaction that allows leukocytes to slow down on the endothelium [2], and it occurs before **cytokine-mediated integrin activation** (2) which strengthens the binding. - **Migration** (4) is also misplaced as it should be the last step after firm adhesion (3). *4,1,2,3* - This sequence is incorrect as **migration** (4) is the last step in the process, not the first. - **Rolling** (1) initiates the process by transiently interacting with endothelial cells, followed by activation and adhesion. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 87. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Migration in the tissues toward a chemotactic stimulus, pp. 86-87. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89.

Q: Rolling of leucocytes on endothelial cells is mediated by which of the following proteins?

Selectins. **Selectins** - **Selectins** mediate the initial, weak and transient adhesion of **leukocytes** to the **endothelial cells** lining blood vessels [1]. - This interaction slows down the leukocytes, causing them to **roll** along the vascular endothelium as a prerequisite for **extravasation** [1]. *Integrins* - **Integrins** are responsible for the **firm adhesion** of leukocytes to endothelial cells, but not the rolling [1]. - They bind to **ICAM-1 (intercellular adhesion molecule-1)** on endothelial cells, leading to stable arrest of the leukocyte [1]. *PECAM-1* - **PECAM-1 (Platelet Endothelial Cell Adhesion Molecule-1)** plays a role in **diapedesis** or **transmigration**, the movement of leukocytes *through* the endothelial cell junctions [1]. - It facilitates the passage of the leukocyte by interacting with PECAM-1 on the endothelial cells, but does not mediate rolling [1]. *Transferrin* - **Transferrin** is an iron-binding protein found in blood plasma that regulates free **iron levels** in the body. - It is crucial for **iron transport** and metabolic processes but has no direct role in leukocyte adhesion or rolling on endothelial cells. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89.

Question 1

Hypertrophic scar is characterized by the following, except

Accepted Answer

it outgrows the wound area

Answer

it involves the flexor surface

Answer

it is non-familial

Answer

it is not related to the race

Question 2

Which of the following factors is labelled as cytokine in the pathogenesis of Systemic Inflammatory Response Syndrome (SIRS)?

Accepted Answer

Tumor necrosis factor

Answer

Leukotrienes

Answer

Nitric oxide

Answer

Complements

Question 3

A 20 year old female was operated for perforation peritonitis and after closing the rectus sheath her abdominal wound was left open to heal with proliferative granulation tissue which contracted and epithelialized to form a scar. This patient had undergone healing by:

Accepted Answer

Secondary intention

Answer

Delayed primary intention

Answer

Primary intention

Answer

Tertiary intention

Question 4

What is the correct order of the normal phases of wound healing?

Accepted Answer

Haemostatic phase → Inflammatory phase → Proliferative phase → Remodelling phase

Answer

Proliferative phase → Haemostatic phase → Inflammatory phase → Remodelling phase

Answer

Remodelling phase → Proliferative phase → Destructive phase → Inflammatory phase

Answer

Destructive phase → Proliferative phase → Remodelling phase → Inflammatory phase

Question 5

What mechanism explains the pathogenesis of Jarisch-Herxheimer reaction in patients treated for syphilis?

Accepted Answer

Inflammatory response to rapid spirochete lysis

Answer

Massive release of treponemal endotoxins

Answer

Autoimmune reaction triggered by treatment

Answer

Allergic reaction to penicillin

Question 6

A male patient is not responding to oxygen therapy and has been diagnosed with ARDS (Acute Respiratory Distress Syndrome). What is the role of IL-8 in ARDS?

Accepted Answer

Recruitment of neutrophils

Answer

Endothelial cell activation

Answer

Macrophage activation

Answer

Promote surfactant production

Question 7

Arrange the following cellular events of inflammation in the correct sequence:

1. Rolling
2. Cytokine-mediated integrin activation
3. Adhesion
4. Migration

Accepted Answer

1,2,3,4

Answer

3,4,1,2

Answer

2,1,4,3

Answer

4,1,2,3

Question 8

A 45-year-old man comes to the physician because of a productive cough and dyspnea. He has smoked one pack of cigarettes daily for 15 years. His temperature is 38.8°C (102°F). Physical examination shows decreased breath sounds and dullness on percussion above the right lower lobe. An x-ray of the chest shows a right lower lobe density and a small amount of fluid in the right pleural space. The patient's symptoms improve with antibiotic treatment, but he develops right-sided chest pain one week later. Pulmonary examination shows new scratchy, high-pitched breath sounds on auscultation of the right lobe. Histologic examination of a pleural biopsy specimen is most likely to show which of the following findings?

Accepted Answer

Fibrin-rich infiltrate

Answer

Dense bacterial infiltrate

Answer

Epithelioid infiltrate with central necrosis

Answer

Red blood cell infiltrate

Question 9

What is the mechanism of secondary healing?

Accepted Answer

Granulation tissue

Answer

Neovascularization

Answer

Scab formation

Answer

Granuloma formation

Question 10

Rolling of leucocytes on endothelial cells is mediated by which of the following proteins?

Accepted Answer

Selectins

Answer

Integrins

Answer

Transferrin

Answer

PECAM-1

Inflammation and Repair — MCQs

Inflammation and Repair — MCQs

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