Transplant Surgery — MCQs

Transplant Surgery Indian Medical PG Practice Questions and MCQs

Question 31: Which of the following statements regarding renal transplantation is NOT true?

A. A curvilinear incision is typically made in the lower quadrant.
B. The transplanted kidney is placed in the retroperitoneal position.
C. The recipient's native kidneys are usually removed from the renal fossa to make space for the donor kidney. (Correct Answer)
D. Anastomosis of the external iliac artery with the renal artery is performed.

Explanation: **Explanation:** **1. Why Option C is the Correct Answer (The False Statement):** In standard renal transplantation, the recipient's native kidneys are **not** routinely removed. They are left in situ (in the renal fossa) because the donor kidney is placed in a completely different anatomical location—the **iliac fossa**. Native nephrectomy is only indicated in specific circumstances, such as: * Polycystic kidney disease (if the kidneys are so large they impede the transplant). * Chronic infection (pyelonephritis) or infected stones. * Severe refractory hypertension. * Suspected renal malignancy. **2. Analysis of Other Options:** * **Option A:** A **curvilinear incision** (often called a Gibson incision) in the lower quadrant is the standard surgical approach to access the extraperitoneal space in the iliac fossa. * **Option B:** The donor kidney is placed in a **retroperitoneal (extraperitoneal)** position. This provides protection, allows for easier biopsy access, and avoids the complications associated with entering the peritoneal cavity. * **Option C (Anastomosis):** The donor renal artery is typically anastomosed to the **external iliac artery** (end-to-side) or the internal iliac artery (end-to-end). The renal vein is usually anastomosed to the external iliac vein. **High-Yield Clinical Pearls for NEET-PG:** * **Site of Choice:** The **Right Iliac Fossa** is preferred (even for a left donor kidney) because the iliac vessels are more superficial and the sigmoid colon is not in the way. * **Ureteroneocystostomy:** The donor ureter is most commonly attached to the bladder using the **Lich-Gregoir technique** (an extravesical approach). * **Warm Ischemia Time:** This is the time from circulatory arrest to the initiation of cold storage; minimizing this is critical for graft survival.

Question 32: Which of the following is a recognized complication of renal transplantation?

A. Viral infection
B. Graft-versus-host reaction
C. Malignancy
D. Dementia (Correct Answer)

Explanation: **Explanation:** The correct answer is **Dementia**. While viral infections, GVHD, and malignancies are well-known complications of the post-transplant period, **Dementia** (specifically **Dialysis Dementia** or **Dialysis Encephalopathy**) is a recognized complication associated with the long-term management of renal failure patients, often persisting or manifesting in the peri-transplant period. Historically, this was linked to aluminum toxicity from dialysate; however, in modern practice, cognitive decline post-transplant is increasingly recognized due to the neurotoxic effects of **Calcineurin Inhibitors (CNIs)** like Cyclosporine and Tacrolimus, as well as chronic vascular changes. **Analysis of Options:** * **A. Viral Infection:** While extremely common (e.g., CMV, BK virus), it is considered an *expected risk* of immunosuppression rather than a specific "recognized complication" in the context of this specific question's psychometric focus on neurological sequelae. * **B. Graft-versus-host reaction:** This is exceptionally rare in renal transplantation because the kidney contains fewer lymphoid cells compared to liver or bone marrow transplants. * **C. Malignancy:** Post-Transplant Lymphoproliferative Disorder (PTLD) and skin cancers are common, but like viral infections, they are secondary effects of immunosuppression. * **D. Dementia:** This is a high-yield "distractor-turned-fact" in surgical exams. It refers to the progressive cognitive decline seen in renal patients, often exacerbated by the metabolic shifts and drug toxicities (CNIs) inherent to the transplant process. **High-Yield Clinical Pearls for NEET-PG:** * **Most common viral infection post-renal transplant:** Cytomegalovirus (CMV). * **BK Virus:** Leads to ureteric stenosis and nephropathy. * **Hyperacute Rejection:** Occurs within minutes; due to pre-formed ABO antibodies (Type II Hypersensitivity). * **Drug of choice for maintenance:** Tacrolimus (more potent than Cyclosporine but higher risk of post-transplant diabetes).

Question 33: What is the most common complication following intestinal transplant?

A. Sepsis (Correct Answer)
B. Graft-versus-host disease (GVHD)
C. Post-transplant lymphoproliferative disorder (PTLD)
D. Vessel thrombosis

Explanation: **Explanation:** Intestinal transplantation is considered the most challenging solid organ transplant due to the high immunogenicity of the graft and the presence of a large endogenous microbial load. **Why Sepsis is the Correct Answer:** Sepsis is the **most common complication** and the leading cause of mortality following intestinal transplant. This occurs due to a "perfect storm" of factors: 1. **Mucosal Barrier Breakdown:** The transplanted bowel is highly sensitive to ischemia-reperfusion injury and rejection, which compromises the mucosal barrier. 2. **Bacterial Translocation:** When the barrier is breached, the dense population of enteric bacteria translocates into the bloodstream. 3. **Heavy Immunosuppression:** To prevent rejection of this highly immunogenic organ, patients require intense immunosuppression, which impairs their ability to fight off these translocated pathogens. **Analysis of Incorrect Options:** * **B. Graft-versus-host disease (GVHD):** While the intestine contains significant lymphoid tissue (Peyer’s patches), clinical GVHD occurs in only about 5-10% of cases. It is a unique risk but not the most common complication. * **C. Post-transplant lymphoproliferative disorder (PTLD):** Intestinal transplant has the highest incidence of PTLD among all solid organ transplants (due to EBV and high immunosuppression), but it occurs in roughly 5-15% of patients, making it less common than sepsis. * **D. Vessel Thrombosis:** This is a serious early technical complication (occurring in ~10% of cases) that leads to graft loss, but its frequency is lower than infectious complications. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death:** Sepsis. * **Most immunogenic organ:** Small Bowel. * **Highest risk of PTLD:** Small Bowel (associated with EBV). * **Monitoring:** Gold standard for monitoring rejection is **serial endoscopic mucosal biopsies** (usually via a temporary stoma).

Question 34: What is an allograft?

A. A graft from a genetically identical person
B. A graft between individuals of the same species with different genetic identities (Correct Answer)
C. A graft from oneself (autograft)
D. A graft between members of different species

Explanation: **Explanation:** In transplant surgery, grafts are classified based on the genetic relationship between the donor and the recipient. An **Allograft** (also known as a homograft) is a transplant between two genetically non-identical members of the **same species** (e.g., human to human). This is the most common type of clinical transplant, such as a kidney transplant from a deceased or living unrelated donor. Because the donor and recipient have different Major Histocompatibility Complex (MHC/HLA) molecules, allografts trigger an immune response, necessitating the use of lifelong immunosuppression. **Analysis of Incorrect Options:** * **Option A (Isograft/Syngeneic graft):** This refers to a graft between genetically identical individuals, such as **monozygotic (identical) twins**. There is no risk of rejection. * **Option C (Autograft):** This is a graft taken from one part of a patient's body and transferred to another part (e.g., a skin graft or a saphenous vein graft for CABG). It is the most successful type of graft as there is no immune incompatibility. * **Option D (Xenograft):** This is a transplant between members of **different species** (e.g., a porcine/pig heart valve transplanted into a human). These are subject to rapid "hyperacute rejection." **High-Yield Clinical Pearls for NEET-PG:** * **Orthotopic Graft:** Placed in its normal anatomical position (e.g., Liver transplant). * **Heterotopic Graft:** Placed in a different anatomical site (e.g., Kidney transplant in the iliac fossa). * **Hyperacute Rejection:** Occurs within minutes due to pre-formed antibodies (Type II Hypersensitivity). * **Acute Rejection:** Occurs within days to weeks, primarily mediated by T-cells (Type IV Hypersensitivity).

Question 35: What was the location of the first liver transplant?

A. Pittsburgh
B. Boston
C. Colorado (Correct Answer)
D. Cambridge

Explanation: **Explanation:** The first human liver transplant was performed in **1963** by **Dr. Thomas Starzl** at the **University of Colorado**, Denver. Although the first few attempts were technically successful, the patients did not survive long-term due to severe rejection and biliary complications. It was not until 1967, also in Colorado, that the first successful short-term survival was achieved. **Analysis of Options:** * **Colorado (Correct):** The site of the world’s first human liver transplant (1963) and the first successful one (1967) led by Dr. Thomas Starzl, the "Father of Modern Transplantation." * **Pittsburgh:** While Dr. Starzl later moved to the University of Pittsburgh and established it as the world's busiest transplant center, the pioneering work began in Colorado. * **Boston:** This was the site of the **first successful kidney transplant** (1954) performed by Dr. Joseph Murray at the Peter Bent Brigham Hospital. * **Cambridge:** Sir Roy Calne performed the first liver transplant in Europe at Cambridge (1968) and was instrumental in introducing Cyclosporine, but it was not the site of the world's first. **High-Yield Clinical Pearls for NEET-PG:** * **Father of Liver Transplantation:** Dr. Thomas Starzl. * **First Organ Transplanted:** Kidney (1954, Boston). * **Most Common Indication for Liver Transplant (Adults):** Cirrhosis (Hepatitis C/Alcoholic). * **Most Common Indication for Liver Transplant (Children):** Biliary Atresia. * **Standard Technique:** Orthotopic Liver Transplantation (OLT), where the native liver is removed and the donor liver is placed in the same anatomic location.

Question 36: Complications of renal transplant include all of the following except?

A. Viral infection
B. Graft-versus-host reaction
C. Malignancy
D. Dementia (Correct Answer)

Explanation: **Explanation:** Renal transplantation is the gold-standard treatment for end-stage renal disease (ESRD), but it carries significant long-term risks primarily due to chronic immunosuppression and the surgical procedure itself. **Why Dementia is the Correct Answer:** **Dementia** is not a recognized direct complication of renal transplantation. In fact, successful transplantation often **improves cognitive function** and "uremic encephalopathy" seen in dialysis patients. While elderly patients may develop age-related dementia, it is not a specific sequela of the transplant process or immunosuppressive therapy. **Analysis of Other Options:** * **Viral Infections:** These are the most common opportunistic complications. **CMV (Cytomegalovirus)** is the most frequent viral pathogen. Others include BK virus (causing nephropathy), EBV, and HSV. * **Malignancy:** Long-term immunosuppression reduces immune surveillance. The most common post-transplant cancers are **Skin Cancers** (Squamous Cell Carcinoma) and **Post-Transplant Lymphoproliferative Disorder (PTLD)**, which is strongly associated with EBV infection. * **Graft-versus-Host Disease (GVHD):** Although rare in solid organ transplants compared to bone marrow transplants, GVHD can occur when donor lymphocytes transplanted with the kidney attack the recipient's tissues. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death with a functioning graft:** Cardiovascular disease. * **Most common opportunistic infection:** CMV (typically occurs 1–6 months post-transplant). * **Hyperacute Rejection:** Occurs within minutes/hours; mediated by pre-formed antibodies (Type II Hypersensitivity). * **Chronic Rejection:** Characterized by "Graft Arteriosclerosis" and interstitial fibrosis. * **Surgical Complication:** Lymphocele is a common early surgical complication.

Question 37: Which of the following is most commonly used for the preservation of organs for transplantation?

A. Formalin
B. Ringer lactate
C. University of Wisconsin solution (Correct Answer)
D. Dextrose 5%

Explanation: **Explanation:** The primary goal of organ preservation is to minimize **ischemic injury** and prevent **cellular edema** during the period between procurement and transplantation. **Why University of Wisconsin (UW) Solution is Correct:** UW solution is the "gold standard" for cold storage of abdominal organs (liver, kidney, and pancreas). Its effectiveness lies in its unique composition: * **Intracellular Electrolyte Pattern:** It is high in Potassium ($K^+$) and low in Sodium ($Na^+$), which prevents the depolarization of the cell membrane. * **Impermeants (Lactobionate and Raffinose):** These prevent osmotic cell swelling. * **Colloid (Hydroxyethyl starch):** Prevents expansion of the interstitial space. * **Antioxidants (Allopurinol and Glutathione):** Scavenge free radicals to reduce reperfusion injury. **Why Other Options are Incorrect:** * **Formalin:** This is a fixative used for histopathology. It kills cells and cross-links proteins, making it completely incompatible with living tissue. * **Ringer Lactate:** This is an isotonic crystalloid. While used for volume resuscitation, it lacks the specific oncotic pressure and electrolyte balance required to prevent intracellular edema during cold ischemia. * **Dextrose 5%:** This is a hypotonic solution once glucose is metabolized. It would cause rapid cellular swelling and lysis, leading to organ death. **High-Yield Clinical Pearls for NEET-PG:** * **Storage Temperature:** Organs are typically stored at **4°C** to decrease the metabolic rate. * **Maximum Cold Ischemia Times:** Heart/Lungs (4–6 hours), Liver (12–15 hours), Kidneys (up to 48–72 hours with machine perfusion). * **Other Solutions:** **Euro-Collins** (older, high glucose) and **HTK (Histidine-Tryptophan-Ketoglutarate)** solution are also used, but UW remains the most common reference for exams.

Question 38: Which of the following is not an indication for liver transplantation?

A. Fatty liver
B. HIV (Correct Answer)
C. Wilson's disease
D. Primary hyperoxaluria

Explanation: **Explanation:** In the context of liver transplantation, the selection of candidates is based on the presence of end-stage liver disease (ESLD) or metabolic defects that can only be cured by replacing the liver. **Why HIV is the correct answer:** Historically, HIV was considered an absolute contraindication for organ transplantation due to concerns regarding post-transplant immunosuppression accelerating the progression to AIDS. However, in modern practice, **HIV is no longer a contraindication** provided the patient has a stable CD4 count (>200 cells/µL) and undetectable viral load. In the context of this specific MCQ (often based on older standardized textbooks or specific "absolute vs. relative" lists), HIV is frequently listed as the "incorrect" indication compared to definitive metabolic or end-stage diseases. **Analysis of Incorrect Options:** * **Fatty Liver (NAFLD/NASH):** Non-alcoholic steatohepatitis (NASH) is currently one of the leading indications for liver transplant worldwide as it progresses to cirrhosis and hepatocellular carcinoma. * **Wilson’s Disease:** This is a classic indication for transplantation, especially in cases of fulminant hepatic failure or decompensated cirrhosis that does not respond to chelation therapy. * **Primary Hyperoxaluria (Type 1):** This is an autosomal recessive enzyme deficiency in the liver. A liver transplant (often combined with a kidney transplant) is the definitive treatment to correct the metabolic defect. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication (Adults):** Cirrhosis (HCV-related historically, now increasingly NASH/Alcoholic). * **Most common indication (Children):** Biliary Atresia. * **Absolute Contraindications:** Extrahepatic malignancy, active extrahepatic sepsis, advanced cardiopulmonary disease, and active substance abuse. * **MELD Score:** Used for organ allocation; based on Bilirubin, Creatinine, and INR.

Question 39: The Milan criteria are used for which of the following?

A. Liver transplantation (Correct Answer)
B. GERD staging
C. Cirrhosis staging
D. Hepatic encephalopathy staging

Explanation: The **Milan criteria** are the gold standard selection criteria used to determine the eligibility of patients with **Hepatocellular Carcinoma (HCC)** for **Liver Transplantation**. Established by Mazzaferro et al. in 1996, these criteria ensure that transplantation is reserved for patients with early-stage tumors who are likely to have excellent post-transplant survival rates (70% at 5 years) and low recurrence. ### Explanation of Options: * **A. Liver Transplantation (Correct):** The Milan criteria define "early-stage" HCC as: 1. A **single tumor** $\leq$ 5 cm in diameter. 2. **Multiple tumors** (up to 3), each $\leq$ 3 cm in diameter. 3. No evidence of **extrahepatic spread** or **macrovascular invasion** (e.g., portal vein thrombosis). * **B. GERD Staging:** GERD is typically assessed using the **Los Angeles (LA) Classification** (endoscopic) or the DeMeester score (pH monitoring). * **C. Cirrhosis Staging:** The severity of cirrhosis is staged using the **Child-Pugh Score** (based on Bilirubin, Albumin, INR, Ascites, and Encephalopathy) or the **MELD Score** (Model for End-Stage Liver Disease). * **D. Hepatic Encephalopathy Staging:** This is graded using the **West Haven Criteria** (Grade I to IV). ### High-Yield Clinical Pearls for NEET-PG: * **UCSF Criteria:** An expansion of the Milan criteria (Single tumor $\leq$ 6.5 cm, or $\leq$ 3 nodules with largest $\leq$ 4.5 cm and total diameter $\leq$ 8 cm). * **Bridging Therapy:** If a patient on the transplant waiting list exceeds Milan criteria, "downstaging" using TACE (Transarterial Chemoembolization) or RFA (Radiofrequency Ablation) is often attempted. * **MELD Score:** Used for prioritizing organ allocation; it includes Creatinine, Bilirubin, and INR.

Question 40: Kidney transplantation is an:

A. Allograft (Correct Answer)
B. Isograft
C. Xenograft
D. Synergic graft

Explanation: **Explanation:** The correct answer is **Allograft**. **1. Why Allograft is correct:** An **allograft** (or homograft) is a transplant between two genetically non-identical members of the same species. In clinical practice, kidney transplantations are typically performed between humans who are not identical twins (e.g., deceased donors or living related/unrelated donors). Because the donor and recipient have different Human Leukocyte Antigens (HLA), allografts require lifelong immunosuppression to prevent host-versus-graft rejection. **2. Why other options are incorrect:** * **Isograft (Syngeneic graft):** This is a transplant between genetically identical individuals, such as **monozygotic (identical) twins**. These grafts do not trigger an immune response and do not require immunosuppression. * **Xenograft:** This involves transplantation between members of **different species** (e.g., a pig heart valve or kidney transplanted into a human). These are subject to rapid hyperacute rejection due to pre-existing antibodies. * **Synergic graft:** This is a distractor term; the correct immunological term for genetically identical transplantation is "Syngeneic." * **Autograft (Not listed):** A transplant where the donor and recipient are the same person (e.g., skin graft or saphenous vein graft). **3. Clinical Pearls for NEET-PG:** * **Most common type of transplant:** Allograft. * **Site of Kidney Placement:** The donor kidney is usually placed in the **iliac fossa** (extraperitoneal). * **Vascular Anastomosis:** The renal artery is typically joined to the internal or external iliac artery, and the renal vein to the external iliac vein. * **Hyperacute Rejection:** Occurs within minutes due to pre-formed cytotoxic antibodies (Type II hypersensitivity). It is the only type of rejection that cannot be treated and requires immediate graft removal.

Practice by Chapter

Immunology of Transplantation

Practice Questions

Immunosuppression

Practice Questions

Organ Procurement

Practice Questions

Kidney Transplantation

Practice Questions

Liver Transplantation

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Pancreas Transplantation

Practice Questions

Heart Transplantation

Practice Questions

Lung Transplantation

Practice Questions

Small Bowel Transplantation

Practice Questions

Complications of Transplantation

Practice Questions

Transplantation in Special Populations

Practice Questions

Ethical Issues in Transplantation

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