Transplant Surgery Practice Questions

Q: Given full supportive treatment, for how long can a patient survive in the anhepatic phase?

24-48 hours. **Explanation:** The **anhepatic phase** refers to the period during liver transplantation when the native liver has been removed and the donor liver has not yet been reperfused. In a controlled surgical setting, this phase usually lasts 60–90 minutes. However, the question asks for the maximum physiological survival limit under full supportive care (e.g., in cases of total hepatectomy for trauma or "two-stage" transplantation). **1. Why 24–48 hours is correct:** The liver is the body’s primary metabolic hub. Without it, the body rapidly develops **profound hypoglycemia** (loss of gluconeogenesis), **hyperammonemia**, **lactic acidosis**, and **coagulopathy**. Even with aggressive IV glucose, bicarbonate, and clotting factor replacement, the accumulation of toxic metabolites and the loss of protein synthesis lead to irreversible cerebral edema and multi-organ failure, typically resulting in death within **24 to 48 hours**. **2. Why other options are incorrect:** * **1-2 hours:** This is the standard duration of the anhepatic phase during a routine transplant, but it is not the limit of survival with supportive care. * **1 week / 2-4 weeks:** These are far too long. No current medical technology (including "artificial livers" like MARS) can replace the liver's complex synthetic and metabolic functions well enough to sustain life for weeks without a graft. **Clinical Pearls for NEET-PG:** * **Metabolic hallmark:** The most immediate life-threatening metabolic derangement in the anhepatic phase is **hypoglycemia**. * **Hemodynamics:** During this phase, there is a significant decrease in venous return due to IVC clamping; this is often managed using a **venovenous bypass**. * **Piggyback Technique:** A surgical variation where the recipient's IVC is preserved, minimizing hemodynamic instability during the anhepatic phase.

Q: What is the indication for liver transplantation that is associated with the best prognosis?

Chronic liver failure. **Explanation:** Liver transplantation is the definitive treatment for end-stage liver disease. The prognosis following transplantation is primarily determined by the underlying etiology and the pre-operative physiological state of the patient. **Why Chronic Liver Failure is the Correct Answer:** Patients with **Chronic Liver Failure** (specifically those with compensated or stable cirrhosis, such as Primary Biliary Cholangitis) generally have the best long-term survival rates. This is because these patients are often chronologically stable, allowing for optimized pre-operative preparation. Among all indications, **Primary Biliary Cholangitis (PBC)** is historically associated with the highest post-transplant survival rates (often exceeding 90% at 5 years). **Analysis of Incorrect Options:** * **A. Acute Liver Failure (ALF):** While life-saving, ALF carries a higher perioperative mortality risk due to complications like cerebral edema, multi-organ failure, and severe systemic inflammation. * **C. Malignancy:** Patients transplanted for Hepatocellular Carcinoma (HCC) face the risk of tumor recurrence, especially if they fall outside the Milan Criteria. This significantly lowers long-term survival compared to non-malignant chronic failure. * **D. Metabolic Liver Disease:** While outcomes are generally good, certain metabolic conditions (like Wilson’s disease presenting as ALF) carry higher acute risks, and others may involve extra-hepatic manifestations that complicate recovery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication (Worldwide):** Hepatitis C related cirrhosis (historically) and NASH/NAFLD (rising). * **Most common indication (Children):** Biliary Atresia. * **Milan Criteria for HCC:** Single lesion <5cm or up to 3 lesions each <3cm. * **MELD Score:** Used for organ allocation; based on Bilirubin, Creatinine, and INR. * **Best Prognostic Etiology:** Primary Biliary Cholangitis (PBC).

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

Kidney. **Explanation:** **Hyperacute rejection** 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 hyperacute rejection. This is primarily because kidneys are highly vascularized and the renal endothelium is particularly sensitive to antibody-mediated damage. Historically, the kidney was the first organ where this phenomenon was extensively studied, leading to the mandatory requirement of the **Pre-transplant Cross-match** (mixing recipient serum with donor lymphocytes) to prevent this occurrence. **Analysis of Incorrect Options:** * **Heart (A) and Lungs (C):** While hyperacute rejection can occur in these organs, it is clinically rarer than in kidneys because cross-matching is strictly performed, and the sheer volume of kidney transplants performed globally makes it the most common clinical association. * **Liver (D):** The liver is considered **"immunologically privileged"** in the context of hyperacute rejection. It has a dual blood supply, a large endothelial surface area that can "sponge up" or dilute antibodies, and the ability to clear immune complexes, making hyperacute rejection extremely rare in liver transplants. **High-Yield Clinical Pearls for NEET-PG:** * **Timeline:** Occurs within **minutes to hours** of transplantation (often seen "on the table"). * **Gross Appearance:** The organ becomes mottled, cyanotic, and flaccid. * **Pathology:** Fibrinoid necrosis of capillaries and widespread microvascular thrombosis. * **Management:** There is no treatment; the graft must be **immediately removed**. * **Prevention:** Perform a **CDC (Complement Dependent Cytotoxicity) cross-match**.

Q: Most Donation after Circulatory Death (DCD) Donors are included in Maastricht category:

3. **Explanation:** The **Maastricht Classification** is the standard framework used to categorize donors after circulatory death (DCD). **Why Option B is Correct:** **Category 3 (Awaiting Cardiac Arrest)** refers to "Controlled DCD." These are patients in an ICU with non-survivable injuries for whom a decision has been made to withdraw life-sustaining treatment (WLST). Because the timing of death is anticipated and the surgical team is prepared, the "warm ischemia time" (the period between circulatory arrest and organ preservation) is minimized. This predictability makes Category 3 the **most common source** of DCD organs globally and in clinical practice. **Why Other Options are Incorrect:** * **Option A (Category 2):** Refers to "Unsuccessful Resuscitation." These are patients who have a witnessed cardiac arrest but cannot be revived. These are "Uncontrolled" donors; the prolonged and unpredictable warm ischemia often leads to poorer organ outcomes compared to Category 3. * **Option C (Category 4):** Refers to "Cardiac Arrest while Brain Dead." This occurs when a patient already declared brain-dead (DBD) suffers a sudden cardiac arrest before organ retrieval. This is a relatively rare clinical scenario. * **Option D (Category 5):** Refers to "Cardiac Arrest in Euthanasia." This is a newer category specific to countries where euthanasia is legal; it is not a primary source of donors in most global healthcare systems. **High-Yield Clinical Pearls for NEET-PG:** * **Maastricht Categories 1 & 2** are "Uncontrolled" (higher risk of primary graft non-function). * **Maastricht Categories 3, 4, & 5** are "Controlled" (better outcomes). * **Warm Ischemia Time (WIT):** The most critical factor in DCD. Livers are most sensitive to WIT, while kidneys are more resilient. * **Category 1:** Dead on arrival (Uncontrolled).

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 mother donated a kidney to her daughter who has chronic renal failure. What type of graft does this represent?

Allograft. **Explanation:** The correct answer is **Allograft**. This classification is based on the genetic relationship between the donor and the recipient. 1. **Why Allograft is correct:** An allograft (or homograft) is a transplant between two genetically non-identical members of the same species. Since a mother and daughter share 50% of their genes but are not genetically identical, the transplant is classified as an allograft. This is the most common type of organ transplantation in clinical practice. 2. **Why other options are incorrect:** * **Isograft (Syngeneic graft):** This occurs between genetically identical individuals, such as **monozygotic (identical) twins**. In this case, there is no risk of rejection. * **Xenograft (Heterograft):** This involves a transplant between members of **different species** (e.g., a porcine/pig heart valve transplanted into a human). * **Autograft:** This is a transplant where the donor and recipient are the **same individual** (e.g., a skin graft from the thigh to the arm or a saphenous vein used for CABG). **High-Yield Clinical Pearls for NEET-PG:** * **Hyperacute Rejection:** Occurs within minutes to hours due to pre-formed cytotoxic antibodies (Type II Hypersensitivity). * **Acute Rejection:** Occurs within days to weeks; primarily mediated by T-cells (Type IV Hypersensitivity). * **Chronic Rejection:** Occurs months to years later, characterized by fibrosis and intimal thickening of graft vessels. * **HLA Matching:** The most important HLA loci for renal transplant success are **HLA-A, HLA-B, and HLA-DR**.

Question 1

Given full supportive treatment, for how long can a patient survive in the anhepatic phase?

Accepted Answer

24-48 hours

Answer

1-2 hours

Answer

1 week

Answer

2-4 weeks

Question 2

Which of the following are absolute contraindications for heart transplantation?

Accepted Answer

HIV infection, irreversible pulmonary hypertension, malignancy

Answer

HIV infection, irreversible pulmonary hypertension, significant pulmonary vascular disease

Answer

Age > 60 years, significant pulmonary vascular disease, malignancy

Answer

HIV infection, age > 60 years, significant pulmonary vascular disease

Question 3

What is the indication for liver transplantation that is associated with the best prognosis?

Accepted Answer

Chronic liver failure

Answer

Acute liver failure

Answer

Malignancy

Answer

Metabolic liver disease

Question 4

Which of the following statements is true regarding successful whole-organ pancreas transplantation in type I diabetes?

Accepted Answer

The pathologic changes of diabetic retinopathy are reversed.

Answer

It results in the maintenance of normal serum glucose levels.

Answer

Recurrence of diabetic nephropathy in simultaneously transplanted kidneys is not prevented.

Answer

Oral glucose tolerance tests remain abnormal.

Question 5

Transplantation of which one of the following organs is most often associated with hyperacute rejection?

Accepted Answer

Kidney

Answer

Heart

Answer

Lungs

Answer

Liver

Question 6

All of the following are true about liver transplantation except?

Accepted Answer

Alcoholic liver disease is the most common indication for liver transplantation.

Answer

Two recipients benefit from split liver transplantation.

Answer

Choledocho-choledochostomy is preferred over choledochojejunostomy.

Answer

The sequence of anastomosis is: 1. Suprahepatic IVC, 2. Infrahepatic IVC, 3. Portal vein, 4. Hepatic artery, 5. Bile duct.

Question 7

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 8

Most Donation after Circulatory Death (DCD) Donors are included in Maastricht category:

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 9

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 10

A mother donated a kidney to her daughter who has chronic renal failure. What type of graft does this represent?

Accepted Answer

Allograft

Answer

Isograft

Answer

Xenograft

Answer

Autograft

Transplant Surgery — MCQs

Transplant Surgery — MCQs

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