Transplant Surgery Practice Questions

Q: What is the most common infection within one month post-renal transplant?

Gram-negative organisms. **Explanation:** Post-transplant infections follow a predictable chronological pattern based on the level of immunosuppression and the time elapsed since surgery. This is typically divided into three periods: **1. Early Period (0–1 Month):** During the first month, infections are primarily related to the **surgical procedure, hospitalization, and indwelling devices** (catheters, stents, and IV lines). * **Gram-negative organisms** (such as *E. coli*, *Klebsiella*, and *Pseudomonas*) are the most common cause, manifesting as Urinary Tract Infections (UTIs), wound infections, or pneumonia. * The patient is also at risk for typical nosocomial infections like *Staphylococcus aureus*. **2. Intermediate Period (1–6 Months):** This is the peak period for **opportunistic infections** due to maximal immunosuppression. * **Cytomegalovirus (CMV)** is the most common viral pathogen overall. * **Pneumocystis jirovecii (formerly carinii)** and *Listeria* are common during this window if prophylaxis is not provided. **3. Late Period (>6 Months):** Infections are usually community-acquired (e.g., Influenza, Pneumococcus) or related to chronic viral states (HBV, HCV, BK virus). **Analysis of Incorrect Options:** * **A. Pneumococcus:** These are community-acquired infections typically seen in the late period (>6 months). * **C. Pneumocystis carinii:** This is an opportunistic fungal infection that typically occurs between 1 and 6 months post-transplant. * **D. Cryptococcus:** A fungal infection usually seen in the late post-transplant period (often >6 months) in heavily immunosuppressed patients. **High-Yield Clinical Pearls for NEET-PG:** * **Most common viral infection overall:** CMV (usually 1–6 months). * **Most common site of infection:** Urinary Tract (UTI). * **Prophylaxis:** Trimethoprim-Sulfamethoxazole (TMP-SMX) is used to prevent both UTIs and *Pneumocystis* pneumonia.

Q: A 32-year-old male who underwent a lung transplant 1 year ago, with a history of acute rejection requiring increased immunosuppression, now presents with low-grade fever, generalized fatigue, and weight loss. Chest x-rays are obtained. What is the most likely diagnosis?

Posttransplant lymphoproliferative disorder (PTLD). ***Posttransplant lymphoproliferative disorder (PTLD)*** - History of **acute rejection** requiring increased immunosuppression significantly raises the risk of **PTLD**, which commonly presents with constitutional **B-symptoms** (fever, fatigue, weight loss). - **EBV-driven lymphoid proliferation** is the most common cause in lung transplant recipients, typically occurring within the first year post-transplant with abnormal chest imaging. *Squamous cell carcinoma* - While lung transplant recipients have increased **malignancy risk**, squamous cell carcinoma typically develops **years after transplantation**, not within the first year. - Constitutional symptoms are **uncommon** in early-stage squamous cell carcinoma, and it's more associated with smoking history. *Aspergilloma* - Represents a **fungal ball** within pre-existing lung cavities and typically presents with **hemoptysis** rather than constitutional symptoms. - More common in patients with **chronic lung disease** or cavitary lesions, not typically associated with systemic B-symptoms. *Phantom tumor or pseudotumor* - Refers to **transient pulmonary infiltrates** or fluid collections that resolve spontaneously, often related to heart failure. - Would not cause persistent **constitutional symptoms** like fever, fatigue, and weight loss over an extended period.

Q: Which type of Maastricht classification is a brought dead patient?

Type 1. The **Maastricht Classification** is used to categorize **Donors after Circulatory Death (DCD)**. This classification is crucial for determining the viability of organs based on the duration of warm ischemia. ### **Explanation of Options** * **Type 1: Brought Dead (Correct):** This category includes patients who are dead on arrival (DOA) at the hospital. These are "uncontrolled" donors because the exact time of cardiac arrest is often unknown, leading to significant warm ischemia. * **Type 2: Unsuccessful Resuscitation:** This refers to patients who suffer a witnessed cardiac arrest (usually in the ER or hospital) but cannot be revived despite full cardiopulmonary resuscitation (CPR) efforts. This is also an "uncontrolled" donor category. * **Type 3: Awaiting Cardiac Arrest:** These are "controlled" donors. These patients have non-survivable injuries, and a decision has been made to withdraw life-sustaining treatment (WLST). Organ procurement begins immediately after the heart stops. * **Type 4: Cardiac Arrest while Brain Dead:** This occurs when a patient who is already diagnosed as brain dead (a heart-beating donor) suffers a sudden cardiac arrest before organ retrieval can be completed. ### **High-Yield Clinical Pearls for NEET-PG** * **Uncontrolled DCD:** Types 1, 2, and 5 (sudden death in an inpatient). * **Controlled DCD:** Types 3 and 4 (better graft outcomes due to shorter warm ischemia). * **Warm Ischemia Time:** This is the period between the cessation of perfusion and the initiation of cold storage. It is highest in Type 1 donors, making their organs (especially kidneys) more prone to delayed graft function. * **Most common DCD type used clinically:** Type 3.

Q: A 32-year-old male who underwent a lung transplant 1 year ago, with a history of acute rejection requiring increased immunosuppression, now presents with low-grade fever, generalized fatigue, and weight loss. Chest x-rays are obtained. What is the most likely diagnosis?

Posttransplant lymphoproliferative disorder (PTLD). ***Posttransplant lymphoproliferative disorder (PTLD)*** - **PTLD** is strongly associated with **EBV reactivation** in immunocompromised transplant recipients, especially those with **increased immunosuppression** following acute rejection episodes. - Presents with **constitutional B-symptoms** (fever, fatigue, weight loss) and typically shows **pulmonary nodules or masses** on chest imaging in lung transplant patients. *Squamous cell carcinoma* - While transplant recipients have **increased malignancy risk**, squamous cell carcinoma typically develops **years to decades** post-transplant, not within 1 year. - Usually presents as **localized skin lesions** or **bronchial masses**, not with generalized constitutional symptoms and systemic involvement. *Aspergilloma* - Represents a **fungal ball** within pre-existing **pulmonary cavities** and typically occurs in patients with underlying lung disease like **tuberculosis** or **sarcoidosis**. - Presents with **hemoptysis** and **productive cough**, not constitutional symptoms, and appears as a **mobile mass within a cavity** on imaging. *Phantom tumor or pseudotumor* - Refers to **loculated pleural fluid** that mimics a mass on chest X-ray, commonly seen in **congestive heart failure** patients. - Represents **inflammatory fluid collection**, not a true neoplastic process, and would not cause systemic constitutional symptoms like fever and weight loss.

Q: Transplantation of which one of the following organs is most often associated with hyper-acute rejection?

Kidney. **Explanation:** **Hyper-acute rejection (HAR)** is a type II hypersensitivity reaction mediated by pre-formed antibodies (anti-HLA or anti-ABO) in the recipient’s serum. These antibodies bind to the donor vascular endothelium immediately upon reperfusion, leading to complement activation, thrombosis, and graft necrosis. **Why Kidney is the Correct Answer:** The **Kidney** is the organ most frequently associated with hyper-acute rejection. This is because renal transplantation involves direct vascular anastomoses, and the renal vasculature is highly sensitive to antibody-mediated endothelial damage. To prevent this, a **mandatory pre-transplant cross-match** is performed to detect pre-existing antibodies. If HAR occurs, it happens within minutes to hours, and the kidney must be removed immediately. **Analysis of Incorrect Options:** * **Liver:** The liver is relatively "immunologically privileged." It can often tolerate ABO-incompatible transplants better than other organs because it can absorb/filter out pre-formed antibodies and has a dual blood supply. * **Heart & Lungs:** While HAR can occur in these organs, it is clinically rarer than in kidneys because prospective cross-matching is strictly enforced, and the density of target antigens/vascular susceptibility is lower compared to the renal capillary bed. **Clinical Pearls for NEET-PG:** * **Mechanism:** Pre-formed antibodies → Complement activation → Fibrinoid necrosis and thrombosis. * **Timeframe:** Minutes to hours (on the operating table). * **Prevention:** Mandatory **CDC (Complement Dependent Cytotoxicity) Cross-match**. * **Pathology:** Grossly, the organ becomes cyanotic, mottled, and flaccid. * **Treatment:** No medical treatment; immediate surgical removal of the graft is required.

Q: What is considered a contraindication for liver transplant?

Metastasis. ### Explanation In transplant surgery, the primary goal is to ensure long-term survival and optimal utility of the donor organ. **Metastasis (Option C)** is a definitive contraindication for liver transplantation because the systemic spread of malignancy implies that replacing the liver will not cure the patient. Furthermore, the mandatory post-transplant immunosuppression would accelerate the growth of micrometastases elsewhere in the body, leading to rapid recurrence and poor outcomes. **Analysis of Incorrect Options:** * **Acute Fulminant Hepatic Failure (Option A):** This is a **primary indication** for emergency liver transplantation (e.g., paracetamol toxicity or viral hepatitis) when the patient meets the King’s College Criteria. * **Metabolic Disease (Option B):** Conditions like Wilson’s disease, Alpha-1 antitrypsin deficiency, and Crigler-Najjar syndrome type 1 are classic indications, as the liver is the site of the underlying enzymatic defect. * **Primary Liver Malignancy (Option D):** Hepatocellular Carcinoma (HCC) is a common indication for transplant, provided it falls within the **Milan Criteria** (single lesion ≤5 cm or up to 3 lesions each ≤3 cm). **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Extrahepatic malignancy (metastasis), active extrahepatic infection/sepsis, advanced cardiopulmonary disease, and active substance abuse (alcohol/drugs). * **Milan Criteria:** The gold standard for selecting HCC patients for transplant to ensure low recurrence rates. * **MELD Score:** Used for organ allocation; it includes Bilirubin, Creatinine, and INR. * **Most common indication (Adults):** Cirrhosis (HCV/Alcohol). * **Most common indication (Pediatrics):** Biliary Atresia.

Q: What is the site of transplantation in islet cell transplantation for diabetes mellitus?

Injected into the portal vein. **Explanation:** The correct answer is **B. Injected into the portal vein.** **Why it is correct:** In islet cell transplantation (the Edmonton Protocol), isolated pancreatic islets are infused into the **portal venous system** via percutaneous transhepatic catheterization [1]. The portal vein is the preferred site because it provides a highly vascularized environment, allowing the transplanted beta cells to receive nutrients and oxygen while directly secreting insulin into the portal circulation [1]. This mimics the physiological pathway where endogenous insulin first passes through the liver, ensuring optimal glucose homeostasis. Once infused, the islets lodge in the small terminal branches of the intrahepatic portal vein [1]. **Why other options are incorrect:** * **Skin (A):** While subcutaneous transplantation is being researched for its accessibility, it currently lacks the necessary vascularity and oxygen tension required for islet survival, leading to high failure rates. * **Liver (C):** While the islets eventually reside *within* the liver, the liver itself is the **target organ**, not the site of transplantation. The procedure is defined by the route of delivery (the portal vein), not the parenchyma. * **Pelvis (D):** The pelvis is the standard site for whole-organ **kidney transplantation** (iliac fossa), but it serves no physiological purpose for islet cells. **High-Yield Clinical Pearls for NEET-PG:** * **The Edmonton Protocol:** The landmark protocol for islet transplantation using steroid-free immunosuppression [2]. * **Primary Complication:** The most common acute complication during the procedure is **portal vein thrombosis** or transient portal hypertension [2]. * **Source:** Islets are typically harvested from a cadaveric donor pancreas using the **Ricordi technique** (automated enzymatic digestion).

Question 1

What is the most common malignancy observed in renal transplant recipients?

Accepted Answer

Kaposi sarcoma

Answer

Squamous cell carcinoma

Answer

Non-Hodgkin lymphoma

Answer

Hodgkin lymphoma

Question 2

What is the most common infection within one month post-renal transplant?

Accepted Answer

Gram-negative organisms

Answer

Pneumococcus

Answer

Pneumocystis carinii

Answer

Cryptococcus

Question 3

A 32-year-old male who underwent a lung transplant 1 year ago, with a history of acute rejection requiring increased immunosuppression, now presents with low-grade fever, generalized fatigue, and weight loss. Chest x-rays are obtained. What is the most likely diagnosis?

Accepted Answer

Posttransplant lymphoproliferative disorder (PTLD)

Answer

Squamous cell carcinoma

Answer

Aspergilloma

Answer

Phantom tumor or pseudotumor

Question 4

Which type of Maastricht classification is a brought dead patient?

Accepted Answer

Type 1

Answer

Type 2

Answer

Type 3

Answer

Type 4

Question 5

A 32-year-old male who underwent a lung transplant 1 year ago, with a history of acute rejection requiring increased immunosuppression, now presents with low-grade fever, generalized fatigue, and weight loss. Chest x-rays are obtained. What is the most likely diagnosis?

Accepted Answer

Posttransplant lymphoproliferative disorder (PTLD)

Answer

Squamous cell carcinoma

Answer

Aspergilloma

Answer

Phantom tumor or pseudotumor

Question 6

What is the commonest cause of mortality in liver transplant operations?

Accepted Answer

Anastomotic leak

Answer

Pulmonary atelectasis

Answer

Thoracic duct fistula

Answer

Subdiaphragmatic collection

Question 7

Hypothermia (0deg to 4deg C) is a critical component of successful organ cold storage because:

Accepted Answer

It slows metabolism and the enzymic processes that would destroy the cell

Answer

Oxygen is more soluble in cold solutions and provides a continual supply for energy metabolism

Answer

There is no way to suppress microbial growth except by cooling and slowing the growth rate

Answer

Hypothermia diminishes energy requirements and allows the limited energy reserve to keep the organ alive

Question 8

Transplantation of which one of the following organs is most often associated with hyper-acute rejection?

Accepted Answer

Kidney

Answer

Heart

Answer

Lungs

Answer

Liver

Question 9

What is considered a contraindication for liver transplant?

Accepted Answer

Metastasis

Answer

Acute fulminant hepatic failure

Answer

Metabolic disease

Answer

Primary liver malignancy

Question 10

What is the site of transplantation in islet cell transplantation for diabetes mellitus?

Accepted Answer

Injected into the portal vein

Answer

Skin

Answer

Liver

Answer

Pelvis

Transplant Surgery — MCQs

Transplant Surgery — MCQs

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