Transplant Surgery Practice Questions

Q: Which of the following are long-term complications (> 10 years) of renal transplantation?

Malignancy and viral infection. **Explanation:** The long-term survival of renal transplant recipients is primarily challenged by complications arising from chronic immunosuppression. Beyond the first decade (10+ years), the cumulative exposure to immunosuppressive agents significantly increases the risk of **Malignancy** and **Viral Infections**. 1. **Malignancy:** This is a leading cause of late mortality. The risk is 3–5 times higher than the general population. The most common are **Skin Cancers** (Squamous Cell Carcinoma being most frequent) and **Post-Transplant Lymphoproliferative Disorder (PTLD)**, often associated with the Epstein-Barr Virus (EBV). 2. **Viral Infections:** While acute bacterial infections dominate the early post-op period, chronic viral infections (like **CMV, BK virus, and HPV**) persist or reactivate in the long term due to impaired T-cell surveillance. **Analysis of Incorrect Options:** * **Bacterial Infections:** These are typically **early** complications (within the first month) related to surgical sites, catheters, or pneumonia. While they can occur late, they are not the defining "long-term" hallmark compared to malignancy. * **Acute Graft Versus Host Disease (GVHD):** This is rare in renal transplants (more common in liver or bone marrow) and occurs **early** in the post-transplant course, not after 10 years. * **Psychosis:** While steroid-induced psychosis can occur, it is usually an **acute** side effect seen during high-dose induction or rejection therapy, not a standard 10-year complication. **High-Yield Pearls for NEET-PG:** * **Most common malignancy post-transplant:** Skin cancer (SCC > BCC). * **Most common viral infection:** Cytomegalovirus (CMV). * **BK Virus:** Associated with ureteral stenosis and nephropathy in renal allografts. * **Leading cause of death with a functioning graft:** Cardiovascular disease (IHD).

Q: Steroids are used in transplantation for what primary purpose?

To prevent graft rejection. **Explanation:** **1. Why Option A is Correct:** Steroids (Corticosteroids like Prednisolone) are a cornerstone of immunosuppressive therapy in organ transplantation. Their primary mechanism is to **prevent and treat graft rejection** by inhibiting the inflammatory response. They act by blocking the expression of various cytokine genes (specifically **IL-1, IL-2, IL-6, and TNF-α**) and inhibiting T-cell activation and proliferation. By suppressing the recipient's immune system, steroids prevent it from recognizing and attacking the donor organ as foreign tissue. **2. Why Other Options are Incorrect:** * **Option B:** Steroids actually **increase** the risk of infection because they suppress the immune system’s ability to fight pathogens. * **Option C:** While steroids reduce inflammation, they can actually **delay** wound healing and recovery due to their catabolic effects on protein and inhibition of fibroblast activity. * **Option D:** Steroids are **immunosuppressants**, meaning they decrease or "blunt" immunity rather than enhancing it. **3. High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Steroids bind to intracellular receptors, translocate to the nucleus, and interfere with the transcription factor **NF-κB**. * **Pulse Therapy:** High-dose intravenous **Methylprednisolone** is the "gold standard" for treating episodes of **acute cellular rejection**. * **Side Effects:** Long-term steroid use is associated with high-yield complications: Cushingoid features, osteoporosis, hyperglycemia (steroid-induced diabetes), cataracts, and peptic ulcers. * **Triple Therapy:** In modern transplant protocols, steroids are typically used as part of a "Triple Drug Regimen" alongside a Calcineurin Inhibitor (e.g., Tacrolimus) and an Antimetabolite (e.g., Mycophenolate Mofetil).

Q: Renal transplantation from a non-genetically related person is an example of?

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** (also known as a homograft) is a transplant between two genetically non-identical members of the same species. Since a "non-genetically related person" belongs to the same species (human) but has a different genetic makeup, this is the standard category for most human organ transplants, including those from deceased donors or unrelated living donors. **2. Analysis of Incorrect Options:** * **Xenograft (or Heterograft):** These terms are synonymous. They refer to a transplant between members of **different species** (e.g., a porcine heart valve or a primate kidney transplanted into a human). * **Isograft (or Syngeneic graft):** This refers to a transplant between genetically **identical** individuals, such as monozygotic (identical) twins. In this case, there is no risk of immunological rejection. * **Autograft:** (Though not listed, a common term) This is a transplant from one part of the body to another in the **same individual** (e.g., a skin graft or CABG). **3. NEET-PG Clinical Pearls:** * **Hyperacute Rejection:** Occurs within minutes to hours due to pre-formed antibodies (Type II hypersensitivity). It is the primary reason for cross-matching. * **Most Common Site:** The transplanted kidney is usually placed in the **iliac fossa** (extraperitoneal). The renal artery is typically anastomosed to the internal or external iliac artery. * **Immunosuppression:** The "Triple Drug Therapy" usually consists of a Calcineurin inhibitor (Tacrolimus), an antiproliferative agent (Mycophenolate Mofetil), and Corticosteroids.

Q: The greatest chance for long-term survival of an allograft would be expected with which type of transplant?

Cornea transplant. The correct answer is **Cornea transplant**. ### **Explanation** The primary reason for the high success rate and long-term survival of corneal allografts is the concept of **"Immunological Privilege."** Unlike other organs, the cornea is naturally **avascular** (lacks blood vessels and lymphatics). This prevents the host’s immune cells (T-lymphocytes) from reaching the graft and prevents graft antigens from reaching the regional lymph nodes (afferent blockade). Consequently, corneal transplants often do not require HLA matching and have the lowest rates of rejection among all allografts, even with minimal systemic immunosuppression. ### **Why other options are incorrect:** * **Kidney, Heart, and Liver transplants:** These are **solid organ transplants** that are highly vascularized. They require strict HLA matching (especially kidneys) and lifelong, potent systemic immunosuppression to prevent T-cell mediated rejection. * **Liver transplant:** While the liver is considered "immunologically tolerant" compared to the heart or kidney (it can sometimes survive across ABO incompatibility), it still carries a significantly higher risk of rejection than the cornea due to its massive vascular bed and exposure to the systemic immune system. ### **High-Yield Clinical Pearls for NEET-PG:** * **Privileged Sites:** Besides the cornea, other immunologically privileged sites include the **testes, brain, and anterior chamber of the eye.** * **Rejection Type:** The most common cause of corneal graft failure is **Type IV (delayed-type) hypersensitivity.** * **Storage:** Corneas are commonly stored in **McCarey-Kaufman (MK) medium** (up to 4 days) or **Optisol** (up to 14 days). * **Order of Rejection Risk:** Generally, Skin > Islets > Heart/Kidney > Liver > Cornea (Least likely to reject).

Q: What is the most common indication for liver transplantation in end-stage liver disease?

Chronic hepatitis C. **Explanation:** The most common indication for liver transplantation (LT) globally, and historically the leading cause of end-stage liver disease (ESLD) requiring transplant, is **Chronic Hepatitis C (HCV)**. While the advent of highly effective Direct-Acting Antivirals (DAAs) is changing the landscape, HCV-related cirrhosis and its complication, Hepatocellular Carcinoma (HCC), remain the top reasons for LT in most international registries. **Analysis of Options:** * **Chronic Hepatitis C (Correct):** It is the leading cause of cirrhosis and HCC worldwide. Even with curative antiviral therapy, patients with established cirrhosis remain at risk for decompensation and malignancy, necessitating transplantation. * **Alcoholic Liver Injury (Incorrect):** This is the **second most common** indication globally. In some specific Western regions, it is currently surpassing HCV due to better viral management, but HCV remains the standard answer for exams based on cumulative data. * **Chronic Hepatitis B (Incorrect):** While a major cause of cirrhosis in Asia and Africa, the availability of effective suppressive therapy (like Tenofovir) and widespread vaccination has made it a less frequent indication for transplant compared to HCV. * **Wilson’s Disease (Incorrect):** This is a common **metabolic** cause for transplant, especially in the pediatric population or young adults presenting with fulminant hepatic failure, but it is rare compared to viral and alcoholic etiologies. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication in children:** Biliary Atresia. * **Most common indication for "Acute Liver Failure":** Acetaminophen (Paracetamol) toxicity. * **Emerging Trend:** Non-Alcoholic Steatohepatitis (NASH/NAFLD) is the fastest-growing indication for liver transplant worldwide. * **MELD Score:** Used to prioritize patients on the transplant waiting list (based on Bilirubin, Creatinine, and INR).

Q: All are common opportunistic infections seen early in renal transplant recipients, EXCEPT:

Nocardia. In renal transplantation, opportunistic infections follow a predictable chronological pattern based on the level of immunosuppression. This timeline is a high-yield concept for NEET-PG. ### **Why Nocardia is the Correct Answer** Post-transplant infections are typically divided into three periods: 1. **Early (0–1 month):** Infections are usually related to surgical complications or donor/recipient-derived pathogens (e.g., UTI, wound infections, Candidiasis). 2. **Intermediate (1–6 months):** Peak immunosuppression leads to viral activations (CMV, EBV, Herpes) and opportunistic pathogens like *Pneumocystis jirovecii*. 3. **Late (>6 months):** Community-acquired infections or chronic opportunistic infections. **Nocardia** is typically a **late-onset** opportunistic infection, usually occurring **after 6 months** (often between 6–12 months) post-transplant. It presents as pulmonary cavitation, skin abscesses, or CNS involvement. ### **Analysis of Incorrect Options** * **Urinary Tract Infections (C):** These are the **most common** infections in the early period (0–1 month) due to surgical manipulation, stents, and catheters. * **Oral Candidiasis (B):** Fungal infections like Thrush are common in the first month due to high-dose induction steroids. * **Herpes Virus (A):** HSV-1 and HSV-2 reactivation typically occurs early (within the first month) due to the surgical stress and initiation of immunosuppression. ### **High-Yield Clinical Pearls** * **Most common infection overall:** Urinary Tract Infection (UTI). * **Most common viral infection (1–6 months):** Cytomegalovirus (CMV). * **Prophylaxis:** Trimethoprim-sulfamethoxazole (TMP-SMX) is used to prevent *Pneumocystis jirovecii*, but it also provides partial prophylaxis against *Nocardia* and *Toxoplasma*. * **Nocardia Triad:** Pneumonia, brain abscess, and cutaneous lesions in an immunocompromised host.

Q: Which of the following is an absolute contraindication for renal transplant?

Untreated malignancy. **Explanation:** Renal transplantation requires lifelong potent immunosuppression to prevent graft rejection. The presence of an **untreated malignancy** is an absolute contraindication because immunosuppressive drugs inhibit the body’s immune surveillance, leading to rapid tumor progression, metastasis, and significantly increased mortality. Most guidelines require a "waiting period" (cancer-free interval) of 2 to 5 years (depending on the tumor type) before a patient can be considered for a transplant. **Analysis of Incorrect Options:** * **Age >65 years:** Advanced age is a **relative contraindication**. While elderly patients have higher surgical risks, "physiological age" is more important than chronological age. Many centers successfully transplant patients over 70 if they have a reasonable life expectancy and low cardiac risk. * **HIV Infection:** Previously an absolute contraindication, it is now a **relative contraindication**. HIV-positive patients can undergo transplantation if they have a stable CD4 count (>200 cells/µL), undetectable viral load, and no active opportunistic infections. * **Chronic Hepatitis B or C:** These are **relative contraindications**. With the advent of highly effective Direct-Acting Antivirals (DAAs) for Hep C and nucleoside analogs for Hep B, these patients can be safely transplanted and managed post-operatively. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Active infection, untreated malignancy, active substance abuse, severe uncorrectable cardiac/pulmonary disease, and non-compliance. * **Most common cause of death** after renal transplant: Cardiovascular disease. * **Most common opportunistic infection** post-transplant: CMV (Cytomegalovirus). * **Hyperacute rejection** is Type II hypersensitivity (pre-formed antibodies); **Acute rejection** is primarily Type IV (T-cell mediated).

Question 1

Which of the following are long-term complications (> 10 years) of renal transplantation?

Accepted Answer

Malignancy and viral infection

Answer

Bacterial infection, acute graft versus host reaction, and viral infection

Answer

Bacterial infection, malignancy, and psychosis

Question 2

Steroids are used in transplantation for what primary purpose?

Accepted Answer

To prevent graft rejection

Answer

To prevent infection

Answer

To speed up recovery

Answer

To enhance immunity

Question 3

What is the principal cause of death in renal transplant patients?

Accepted Answer

Infection

Answer

Uremia

Answer

Malignancy

Answer

Rejection

Question 4

Renal transplantation from a non-genetically related person is an example of?

Accepted Answer

Allograft

Answer

Xenograft

Answer

Heterograft

Answer

Isograft

Question 5

The greatest chance for long-term survival of an allograft would be expected with which type of transplant?

Accepted Answer

Cornea transplant

Answer

Kidney transplant

Answer

Heart transplant

Answer

Liver transplant

Question 6

A 34-year-old patient with chronic glomerulonephritis has been receiving hemodialysis for the last three years and is awaiting renal transplantation from a cadaver donor. His blood type is A+ and he has been receiving transfusions for the past six months. Which of the following factors contraindicate renal transplantation in this patient?

Accepted Answer

Donor blood group B+

Answer

Autonomic neuropathy of the recipient

Answer

Two antigens of HLA match with the cadaver donor

Answer

Recipient blood hemoglobin level of 6.0 g/dL

Question 7

What is the most common indication for liver transplantation in end-stage liver disease?

Accepted Answer

Chronic hepatitis C

Answer

Wilson's disease

Answer

Chronic hepatitis B

Answer

Alcoholic liver injury

Question 8

What describes a reduced liver transplant?

Accepted Answer

A part of a liver segment transplanted into a recipient depending upon the requirement.

Answer

Given to two recipients after dividing into two parts.

Answer

Left lateral lobe divided and given to a child.

Answer

Left lateral segment divided from segment 2 and given to a child.

Question 9

All are common opportunistic infections seen early in renal transplant recipients, EXCEPT:

Accepted Answer

Nocardia

Answer

Herpes virus

Answer

Oral candidiasis

Answer

Urinary tract infections

Question 10

Which of the following is an absolute contraindication for renal transplant?

Accepted Answer

Untreated malignancy

Answer

Age >65 years

Answer

HIV infection

Answer

Chronic hepatitis B or C

Transplant Surgery — MCQs

Transplant Surgery — MCQs

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