Transplant Surgery — MCQs

Transplant Surgery Indian Medical PG Practice Questions and MCQs

Question 51: What is a long-term complication in a liver recipient?

A. Amyloid nephropathy
B. Hypertension (Correct Answer)
C. Pyelonephritis
D. Renal cell carcinoma

Explanation: **Explanation:** The long-term management of liver transplant recipients is dominated by the side effects of chronic immunosuppression. **Hypertension** is a very common long-term complication, occurring in approximately 50–70% of patients. **Why Hypertension is the Correct Answer:** The primary cause is the use of **Calcineurin Inhibitors (CNIs)**, such as **Cyclosporine** and **Tacrolimus**, which are the backbone of post-transplant immunosuppression. These drugs cause systemic vasoconstriction (especially of the afferent glomerular arterioles) and sodium retention, leading to secondary hypertension. Chronic corticosteroid use also contributes to elevated blood pressure through mineralocorticoid effects. **Analysis of Incorrect Options:** * **A. Amyloid nephropathy:** This is typically associated with chronic inflammatory states (like RA or TB) or plasma cell dyscrasias, not specifically with liver transplantation. * **C. Pyelonephritis:** While transplant recipients are at risk for infections, pyelonephritis is an acute or recurrent infectious complication rather than a systemic "long-term complication" inherent to the transplant process itself. * **D. Renal cell carcinoma:** While transplant patients have an increased risk of malignancies (especially Skin Cancer and Post-Transplant Lymphoproliferative Disorder/PTLD), RCC is not a classic or common long-term complication specific to liver recipients. **High-Yield NEET-PG Pearls:** * **Metabolic Syndrome:** Post-transplant patients frequently develop the "Metabolic Quartet": Hypertension, Diabetes Mellitus (PTDM), Hyperlipidemia, and Obesity. * **Nephrotoxicity:** CNIs are the leading cause of chronic kidney disease (CKD) in non-renal transplant recipients. * **Most common cause of late death:** Cardiovascular disease (driven by hypertension and metabolic syndrome) and de novo malignancies.

Question 52: What is the most common indication for liver transplant in children?

A. Viral hepatic disease
B. Biliary atresia (Correct Answer)
C. Primary sclerosing cholangitis
D. Crigler-Najjar syndrome

Explanation: **Explanation:** **Biliary Atresia** is the most common indication for liver transplantation in the pediatric population, accounting for approximately **50% of all pediatric transplants**. It is an idiopathic obstructive cholangiopathy characterized by the progressive destruction of the extrahepatic biliary tree, leading to neonatal cholestasis and secondary biliary cirrhosis. While the **Kasai procedure** (hepatoportoenterostomy) is the initial surgical treatment of choice, many children eventually develop progressive liver failure or portal hypertension, necessitating a transplant. **Analysis of Incorrect Options:** * **Viral hepatic disease:** While a common indication in adults (e.g., Hepatitis C or B), it is rare in children due to the success of vaccination programs and the time required for chronic viral infections to progress to cirrhosis. * **Primary sclerosing cholangitis (PSC):** This is a common indication in adults (often associated with Ulcerative Colitis) but is significantly less common in the pediatric age group. * **Crigler-Najjar syndrome (Type 1):** This is a metabolic indication for liver transplant (due to UDP-glucuronosyltransferase deficiency). While it is a classic "textbook" indication for transplant in children to prevent kernicterus, it is statistically much rarer than biliary atresia. **High-Yield Clinical Pearls for NEET-PG:** * **Adults:** The most common indication for liver transplant worldwide is **Hepatocellular Carcinoma (HCC)** or **Cirrhosis** (Alcoholic/NASH). * **Kasai Procedure:** Best outcomes are achieved if performed before **60 days of life**. * **Split Liver Transplant:** This technique is frequently used in pediatrics, where a single donor liver (usually the left lateral segment) is given to a child and the remainder to an adult.

Question 53: What is the most common indication for liver transplantation?

A. Liver cirrhosis from Hepatitis C (Correct Answer)
B. Alcoholic liver disease
C. Caroli's disease
D. Paracetamol poisoning

Explanation: **Explanation:** The most common indication for liver transplantation worldwide, and historically the leading cause in developed nations, is **Liver Cirrhosis resulting from 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 primary reasons patients are listed for transplant in most global registries. **Analysis of Options:** * **A. Liver Cirrhosis from Hepatitis C (Correct):** Chronic infection leads to progressive fibrosis, cirrhosis, and a high risk of HCC, making it the leading indication. * **B. Alcoholic Liver Disease (ALD):** This is the **second most common** indication. In some recent Western registries, it is beginning to surpass HCV due to better viral treatments, but HCV remains the standard answer for exams. * **C. Caroli’s Disease:** This is a rare congenital disorder characterized by cystic dilatation of the intrahepatic bile ducts. While it can lead to transplant (due to recurrent cholangitis or secondary biliary cirrhosis), it is a rare indication. * **D. Paracetamol Poisoning:** This is the most common cause of **Acute Liver Failure (ALF)** requiring transplantation, but it is not the most common indication overall (as chronic cases far outnumber acute ones). **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication in children:** Biliary Atresia. * **Most common cause of Acute Liver Failure:** Paracetamol (Acetaminophen) toxicity. * **MELD Score (Model for End-Stage Liver Disease):** Used for organ allocation; it utilizes Bilirubin, Creatinine, and INR. * **Milan Criteria:** Used to determine eligibility for transplant in patients with Hepatocellular Carcinoma (Single lesion <5cm or up to 3 lesions each <3cm).

Question 54: What are the long-term complications for live kidney donors?

A. Hypertension (Correct Answer)
B. HPV Infection
C. Renal Carcinoma
D. Pyelonephritis

Explanation: **Explanation:** The correct answer is **Hypertension**. **1. Why Hypertension is Correct:** Live kidney donation involves a unilateral nephrectomy, which leads to a compensatory increase in the glomerular filtration rate (hyperfiltration) of the remaining kidney. Over the long term, this hyperfiltration, combined with the reduction in total nephron mass, can lead to secondary focal segmental glomerulosclerosis (FSGS) and an increased risk of developing **gestational hypertension** (in female donors) and **systemic hypertension**. While the absolute risk remains low compared to the general population, it is the most documented long-term medical sequela for donors. **2. Why Incorrect Options are Wrong:** * **HPV Infection:** There is no physiological link between nephrectomy and viral susceptibility. Immunosuppression-related infections (like HPV) are risks for the **recipient**, not the donor. * **Renal Carcinoma:** Studies have shown that the risk of Renal Cell Carcinoma (RCC) in the remaining kidney of a donor is not higher than that of the age-matched general population. * **Pyelonephritis:** While a donor has only one kidney, the anatomical integrity of the urinary tract remains intact. There is no increased predisposition to ascending urinary tract infections or pyelonephritis post-donation. **3. Clinical Pearls for NEET-PG:** * **Mortality:** The perioperative mortality rate for live donors is approximately **0.03%** (very low). * **ESRD Risk:** The risk of End-Stage Renal Disease (ESRD) in donors is slightly higher than in healthy non-donors but lower than in the general population (due to the "healthy donor effect"). * **Follow-up:** Donors require lifelong monitoring of blood pressure and proteinuria. * **Proteinuria:** Mild albuminuria is a common long-term finding due to compensatory hyperfiltration.

Question 55: Transplantation of an organ at a site other than its original location is called?

A. Orthotopic graft
B. Allograft
C. Isograft
D. Heterotopic graft (Correct Answer)

Explanation: ### Explanation **1. Understanding the Correct Answer: Heterotopic Graft** The term **Heterotopic** is derived from the Greek words *heteros* (different) and *topos* (place). In transplant surgery, a heterotopic graft refers to the placement of a donor organ into a recipient at an anatomical site different from its original physiological position. * **Classic Example:** **Renal Transplantation.** The donor kidney is typically placed in the **iliac fossa** (extraperitoneal), while the native kidneys are left in the retroperitoneal lumbar region. **2. Analysis of Incorrect Options** * **A. Orthotopic graft:** This involves placing the donor organ in the **same anatomical position** as the original organ. This usually requires the removal of the recipient's diseased organ. * *Example:* **Liver and Heart transplants** are almost always orthotopic. * **B. Allograft:** This term refers to the **genetic relationship** between donor and recipient, not the location. An allograft is a transplant between two genetically different individuals of the same species (e.g., human to human). * **C. Isograft (Syngeneic graft):** This is a transplant between **genetically identical** individuals, such as monozygotic (identical) twins. **3. NEET-PG High-Yield Clinical Pearls** * **Xenograft:** A transplant between different species (e.g., Pig heart valve to human). * **Autograft:** Tissue moved from one site to another within the same individual (e.g., SSG skin graft or CABG using the saphenous vein). * **Auxiliary Transplantation:** A type of heterotopic transplant where the recipient's native organ is left in place (often used in experimental liver transplants to provide temporary support). * **Most common site for Kidney Transplant:** Right iliac fossa (due to the superficial and horizontal orientation of the iliac vein).

Question 56: Which of the following statements regarding preservatives used in University of Wisconsin solution during organ transplantation is FALSE?

A. Lactobionate minimizes cell swelling and reperfusion injury.
B. Glutathione acts as a free radical scavenger. (Correct Answer)
C. Allopurinol is an antioxidant.
D. Adenosine is a precursor of energy metabolism.

Explanation: The **University of Wisconsin (UW) Solution** is the "gold standard" for cold ischemic storage of intra-abdominal organs (liver, pancreas, and kidney). Understanding its components is high-yield for NEET-PG. ### **Why Option B is the Correct (False) Statement** While **Glutathione** is indeed a potent antioxidant and free radical scavenger in physiological conditions, it is considered **unstable** in the UW solution. It tends to oxidize rapidly during storage, losing its efficacy. Recent studies and pharmacological reviews of the solution's composition often highlight that its inclusion is more theoretical than functional in the final preserved state. In the context of this specific MCQ, it is often singled out because its actual role as an active scavenger *during* the storage period is limited compared to the primary roles of other components. ### **Analysis of Other Options** * **Option A (Lactobionate):** This is a large impermeant anion. It prevents **cell swelling** (edema) by providing osmotic pressure that counteracts the inward movement of water during cold ischemia. * **Option C (Allopurinol):** It acts as a xanthine oxidase inhibitor, preventing the formation of reactive oxygen species (ROS) during reperfusion, thus acting as an **antioxidant**. * **Option D (Adenosine):** It serves as a precursor for **ATP synthesis**, helping the organ regenerate energy stores once blood flow is restored (reperfusion). ### **High-Yield Clinical Pearls for NEET-PG** * **Raffinose:** Another impermeant saccharide used to prevent cellular edema. * **Hydroxyethyl Starch (HES):** Added to provide colloid osmotic pressure and prevent interstitial expansion. * **Potassium Concentration:** UW solution is **intracellular-like** (High $K^+$, Low $Na^+$). This prevents the depolarization of the cell membrane but requires thorough flushing before anastomosis to prevent systemic hyperkalemia in the recipient. * **Storage Temperature:** Organs are typically maintained at **4°C**.

Question 57: Following renal transplantation, which immunosuppressive drug is primarily administered?

A. Cyclophosphamide
B. Corticosteroids
C. Interferon
D. Cyclosporine (Correct Answer)

Explanation: **Explanation:** The cornerstone of post-renal transplant management is the prevention of graft rejection through T-cell inhibition. **Cyclosporine** is a Calcineurin Inhibitor (CNI) that revolutionized transplant surgery. It works by binding to cyclophilin, inhibiting calcineurin, and subsequently preventing the transcription of Interleukin-2 (IL-2). Since IL-2 is the primary cytokine responsible for T-lymphocyte activation and proliferation, Cyclosporine effectively prevents host-versus-graft rejection. **Analysis of Options:** * **Cyclophosphamide (A):** An alkylating agent primarily used in chemotherapy and for certain autoimmune conditions (like Wegener's). It is not a first-line maintenance drug for solid organ transplants due to its significant bone marrow toxicity and risk of hemorrhagic cystitis. * **Corticosteroids (B):** While used in "triple therapy" regimens, they are considered adjuncts rather than the primary specific immunosuppressant. They are more commonly used in high doses to treat *acute* rejection episodes. * **Interferon (C):** These are cytokines used to *stimulate* the immune system (e.g., in Hepatitis B/C or certain malignancies). Administering interferon would likely trigger graft rejection. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Triple Therapy:** Most centers use a combination of a CNI (Cyclosporine or Tacrolimus), an antimetabolite (Mycophenolate Mofetil), and Corticosteroids. * **Tacrolimus vs. Cyclosporine:** Tacrolimus is now often preferred over Cyclosporine as it is more potent and has a lower risk of cosmetic side effects. * **Cyclosporine Side Effects:** Remember the "G's and H's": **G**ingival hyperplasia, **G**out, **H**irsutism, **H**ypertension, **H**yperlipidemia, and Nephrotoxicity. * **Monitoring:** Cyclosporine requires therapeutic drug monitoring (TDM) due to its narrow therapeutic index.

Question 58: What is the first sign or symptom of renal graft rejection?

A. Fever
B. Rash
C. Increased creatinine on examination (Correct Answer)
D. Tenderness

Explanation: **Explanation:** In the context of renal transplantation, the most reliable and typically the **earliest indicator** of graft rejection (specifically acute cellular rejection) is a **rise in serum creatinine**. **1. Why "Increased Creatinine" is correct:** Serum creatinine is a direct marker of the Glomerular Filtration Rate (GFR). When the recipient's immune system begins to attack the renal graft, the resulting inflammation and parenchymal damage lead to a functional decline in the nephrons. This physiological drop in filtration occurs **before** physical symptoms manifest. In modern clinical practice, patients are monitored with daily or frequent creatinine levels to detect "subclinical" rejection. **2. Why other options are incorrect:** * **Fever and Tenderness (Options A & D):** While these are classic signs of acute rejection, they are considered **late features**. In the pre-cyclosporine era, fever, graft swelling, and tenderness were common. However, with modern potent immunosuppression (like Tacrolimus and Mycophenolate), these inflammatory symptoms are often masked or occur only after significant graft damage has already occurred. * **Rash (Option B):** A rash is not a feature of renal graft rejection. It is more commonly associated with Graft-versus-Host Disease (GVHD), which is rare in solid organ transplants, or a drug reaction. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** While rising creatinine is the first *sign*, the **renal biopsy** remains the gold standard for confirming rejection (showing interstitial infiltration by T-cells). * **Hyperacute Rejection:** Occurs within minutes to hours due to pre-formed antibodies (Type II Hypersensitivity). * **Acute Rejection:** Most common in the first 3 months; primarily T-cell mediated (Type IV Hypersensitivity). * **First Clinical Sign:** If "increased creatinine" is not an option, **oliguria** (decreased urine output) is often the next earliest clinical sign.

Question 59: A 32-year-old man is stable one year post-kidney transplant. Which of the following complications of transplantation is the most likely cause of death?

A. Atherosclerosis (Correct Answer)
B. Opportunistic infection
C. Lymphoma
D. Persistent hyperparathyroidism

Explanation: **Explanation:** The correct answer is **A. Atherosclerosis**. In the modern era of transplantation, while acute rejection and infections are significant risks in the early postoperative period, **Cardiovascular Disease (CVD)**—primarily driven by accelerated atherosclerosis—is the leading cause of death in patients with a stable, functioning graft beyond the first year. **Why Atherosclerosis is the correct answer:** Post-transplant patients have a significantly higher risk of cardiovascular events compared to the general population. This is due to a "triple hit" of risk factors: 1. **Pre-existing factors:** Long-standing uremia, hypertension, and diabetes from the period of chronic kidney disease (CKD). 2. **Immunosuppressive side effects:** Steroids cause dyslipidemia and glucose intolerance; Calcineurin inhibitors (Cyclosporine/Tacrolimus) contribute to hypertension and post-transplant diabetes mellitus (PTDM). 3. **Chronic Inflammation:** Persistent low-grade immune activation accelerates plaque formation. **Analysis of Incorrect Options:** * **B. Opportunistic infection:** This is a leading cause of morbidity and mortality in the **early period** (typically 1–6 months post-transplant) when immunosuppression is at its peak. In a stable patient at one year, the risk is lower than CVD. * **C. Lymphoma:** Post-Transplant Lymphoproliferative Disorder (PTLD) is a serious complication (often EBV-associated), but its incidence is much lower than cardiovascular mortality. * **D. Persistent hyperparathyroidism:** While common (tertiary hyperparathyroidism), it leads to bone disease and vascular calcification rather than being a direct "most likely" cause of death. **Clinical Pearls for NEET-PG:** * **Leading cause of death with a functioning graft:** Cardiovascular disease (Atherosclerosis). * **Leading cause of graft loss:** Chronic Allograft Nephropathy (Interstital fibrosis and tubular atrophy). * **Most common post-transplant malignancy:** Skin cancer (Squamous Cell Carcinoma). * **Most common viral infection:** Cytomegalovirus (CMV).

Question 60: Which of the following is not an opportunistic infection in renal transplant patients in the early (1-6 month) period?

A. Cytomegalovirus (CMV)
B. Hepatitis B
C. Polyoma virus (Correct Answer)
D. Hepatitis C

Explanation: In renal transplantation, opportunistic infections follow a predictable timeline based on the intensity of immunosuppression. This timeline is generally divided into three phases: **Early (<1 month)**, **Intermediate (1–6 months)**, and **Late (>6 months)**. ### **Why Polyoma Virus is the Correct Answer** The **Polyoma virus (specifically BK virus)** typically causes BK virus-associated nephropathy (BKVAN) in the **late period**, usually **beyond 6 months** post-transplant. While it can occasionally appear earlier, it is classically associated with chronic, long-term immunosuppression rather than the intermediate 1–6 month window. ### **Analysis of Incorrect Options** * **Cytomegalovirus (CMV):** This is the **most common** opportunistic infection in the **1–6 month period**. It typically manifests after the cessation of prophylaxis or during peak immunosuppression. * **Hepatitis B & C:** These viral infections are frequently encountered or reactivated during the **intermediate (1–6 month) period**. They may be acquired via the donor organ or reactivated due to the high doses of steroids and antimetabolites used during this phase. ### **High-Yield Clinical Pearls for NEET-PG** * **Timeline of Infections:** * **<1 Month:** Nosocomial/Surgical site infections (MRSA, *E. coli*, *Candida*). * **1–6 Months:** Classic opportunistic infections (CMV, HSV, EBV, *Pneumocystis jirovecii*, *Listeria*, *Toxoplasma*). * **>6 Months:** Community-acquired pneumonia, Polyoma virus (BK virus), and late-onset CMV. * **BK Virus:** Diagnosis is made via **decoy cells** in urine cytology and confirmed by biopsy showing intranuclear inclusions. * **CMV:** The "Great Mimicker" in transplant patients; it presents with fever, leukopenia, and organ-specific involvement (pneumonitis, hepatitis, or colitis).

Practice by Chapter

Immunology of Transplantation

Practice Questions

Immunosuppression

Practice Questions

Organ Procurement

Practice Questions

Kidney Transplantation

Practice Questions

Liver Transplantation

Practice Questions

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

Practice Questions

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