Transplant Surgery Practice Questions

Q: After the first postoperative year of cardiac transplantation, what is the most common cause of death?

Accelerated graft arteriosclerosis. **Explanation:** The survival of cardiac transplant recipients is divided into two distinct phases: the early postoperative period (within the first year) and the late postoperative period (after one year). **Why 'Accelerated Graft Arteriosclerosis' is correct:** Also known as **Cardiac Allograft Vasculopathy (CAV)**, this is a unique, progressive form of chronic rejection. Unlike typical atherosclerosis, CAV is characterized by diffuse, concentric intimal proliferation affecting the entire length of the coronary arteries. It remains the leading cause of late mortality (after 1 year) because the denervated heart does not experience typical angina, often leading to silent myocardial infarction, heart failure, or sudden death. **Why the other options are incorrect:** * **Infection:** This is the **most common cause of death within the first year** (specifically the first 30 days to 6 months) due to intense induction immunosuppression. * **Acute Rejection:** This typically occurs within the first 3–6 months. While it remains a risk, its incidence decreases significantly after the first year due to maintenance therapy. * **Arrhythmia:** While arrhythmias can occur due to surgical trauma or acute rejection in the early phase, they are rarely the primary cause of late-term mortality unless secondary to CAV. **High-Yield Clinical Pearls for NEET-PG:** 1. **Most common cause of death ( 1 year):** Cardiac Allograft Vasculopathy (CAV) / Graft Arteriosclerosis. 3. **Gold Standard for CAV diagnosis:** Annual coronary angiography with **Intravascular Ultrasound (IVUS)**, as angiography alone may underestimate the diffuse narrowing. 4. **Malignancy:** The risk of lymphomas (PTLD) and skin cancers increases significantly in the late phase due to long-term immunosuppression.

Q: What type of graft is a graft from a sister to a brother?

Allograft. ### Explanation The correct answer is **Allograft (Option B)**. **1. Why Allograft is correct:** An **allograft** (or homograft) is a transplant between two genetically non-identical members of the same species. Since a brother and sister share approximately 50% of their genetic material (unless they are monozygotic twins), they are genetically distinct individuals. Therefore, any organ or tissue transfer between them is classified as an allograft. This requires immunosuppression to prevent T-cell mediated rejection. **2. Why other options are incorrect:** * **Isograft (Option A):** This is a graft between genetically identical individuals. In humans, this only occurs between **monozygotic (identical) twins**. Since the question specifies a brother and sister (who are dizygotic/siblings), they cannot be genetically identical. * **Autograft (Option C):** This involves a graft taken from one part of a patient's body and transferred to another part of the **same individual** (e.g., a skin graft from the thigh to the arm or a CABG using the radial artery). There is no risk of rejection. * **Heterograft (Option D):** Also known as a **Xenograft**, this is a transplant between members of **different species** (e.g., a porcine/pig heart valve transplanted into a human). **3. Clinical Pearls for NEET-PG:** * **Hyperacute Rejection:** Occurs within minutes to hours due to pre-formed antibodies (Type II Hypersensitivity). * **Acute Rejection:** Occurs within days to weeks; primarily T-cell mediated (Type IV Hypersensitivity). * **Chronic Rejection:** Occurs months to years later; characterized by fibrosis and vascular occlusion. * **Order of Immunogenicity:** Xenograft > Allograft > Isograft = Autograft. * **Graft-versus-Host Disease (GVHD):** Most common in bone marrow transplants where donor T-cells attack the recipient's tissues.

Q: A parathyroid gland is implanted into the forearm muscle. What type of transplantation is this?

Heterotopic. ### Explanation The correct answer is **Heterotopic** transplantation. **1. Why Heterotopic is Correct:** In transplant surgery, the classification is based on the anatomical site of implantation. **Heterotopic transplantation** occurs when a tissue or organ is implanted into an anatomical location different from its original physiological position. * **Clinical Context:** In patients undergoing total parathyroidectomy (e.g., for secondary hyperparathyroidism), a portion of the parathyroid gland is often autotransplanted into the **brachioradialis muscle** of the forearm. This allows the gland to maintain endocrine function while being easily accessible for monitoring or partial resection if recurrence occurs. **2. Why Other Options are Incorrect:** * **Orthotopic (Option A):** This refers to placing the graft in its **normal anatomical position** after removing the diseased organ. A classic example is a Liver Transplant, where the donor liver replaces the recipient's liver in the right upper quadrant. * **Auxiliary (Option C):** This is a subtype of heterotopic transplant where the graft is placed in a different location **without removing the recipient's native organ**. The graft "assists" the failing organ. An example is an auxiliary liver transplant placed in the infra-mesocolic space. **3. High-Yield Clinical Pearls for NEET-PG:** * **Autograft:** Transfer of tissue within the same individual (e.g., the parathyroid forearm transplant mentioned above). * **Allograft:** Transfer between genetically different members of the same species (most cadaveric organ transplants). * **Isograft (Syngeneic):** Transfer between genetically identical individuals (monozygotic twins). * **Xenograft:** Transfer between different species (e.g., porcine heart valve). * **Renal Transplant:** Most kidney transplants are **Heterotopic** (placed in the iliac fossa), not orthotopic.

Q: Which of the following is not a component of the University of Wisconsin solution?

Potassium citrate. The **University of Wisconsin (UW) solution** is the "gold standard" for cold storage of intra-abdominal organs (liver, pancreas, and kidney). Its primary goal is to minimize cell swelling and prevent oxidative damage during ischemia. ### Why Potassium Citrate is the Correct Answer The UW solution is an **intracellular-type** solution, meaning it contains high concentrations of potassium and low concentrations of sodium to mimic the intracellular environment. However, the potassium source in UW solution is **Potassium Lactobionate**, not Potassium citrate. Potassium citrate is typically used in cardioplegic solutions (like St. Thomas solution) to induce cardiac arrest, but it is not a component of the UW formula. ### Explanation of Incorrect Options * **Adenosine (Option A):** Included as a precursor for ATP synthesis, helping the organ regain energy stores once reperfused. * **Glutathione (Option B):** Acts as a potent antioxidant to reduce oxidative stress and neutralize free radicals during the reperfusion phase. * **Allopurinol (Option C):** A xanthine oxidase inhibitor that prevents the formation of reactive oxygen species (ROS), protecting the graft from reperfusion injury. ### High-Yield Clinical Pearls for NEET-PG * **Key Components of UW Solution:** Lactobionate and Raffinose (prevent osmotic swelling), Hydroxyethyl starch (HES - prevents interstitial edema), and Magnesium sulfate. * **Mechanism:** It works by preventing the "sodium-potassium pump" failure that occurs during cold ischemia. * **Storage Time:** It allows for liver preservation for up to 12–18 hours and kidney preservation for up to 48–72 hours. * **Note:** Because of its high potassium content (120 mEq/L), the solution must be thoroughly flushed out of the organ before anastomosis to prevent **systemic hyperkalemia** and cardiac arrest in the recipient.

Q: Which immunosuppressive drug is commonly given after renal transplantation?

Corticosteroids. **Explanation:** In renal transplantation, the primary goal of immunosuppression is to prevent graft rejection while minimizing systemic toxicity. **Corticosteroids** (such as Prednisolone) are a cornerstone of post-transplant maintenance therapy. They act by inhibiting the expression of multiple inflammatory cytokines (like IL-1, IL-2, and TNF-alpha) and suppressing T-cell activation. Most transplant protocols utilize a "triple drug regimen" consisting of a Calcineurin Inhibitor (e.g., Tacrolimus), an Antiproliferative agent (e.g., Mycophenolate Mofetil), and **Corticosteroids**. **Analysis of Options:** * **A. Cyclophosphamide:** While an immunosuppressant, it is primarily used in chemotherapy or for specific autoimmune conditions (like Wegener’s granulomatosis). It is rarely used in routine transplant maintenance due to its significant toxicity profile (e.g., hemorrhagic cystitis). * **C. Interferon:** This is an immunomodulator, not an immunosuppressant. In fact, interferons *stimulate* the immune system to fight viruses or tumors and could potentially trigger graft rejection if administered post-transplant. * **D. All of the above:** Incorrect, as only corticosteroids are standard post-transplant therapy among the choices. **High-Yield Clinical Pearls for NEET-PG:** * **Standard Triple Therapy:** Tacrolimus + Mycophenolate Mofetil (MMF) + Prednisolone. * **Drug of Choice for Induction:** Basiliximab (IL-2 receptor antagonist) or Antithymocyte Globulin (ATG). * **Side Effects of Steroids:** Hyperglycemia (Post-Transplant Diabetes Mellitus), osteoporosis, peptic ulcers, and impaired wound healing. * **Tacrolimus vs. Cyclosporine:** Tacrolimus is generally preferred due to a lower incidence of rejection and fewer cosmetic side effects (like gingival hyperplasia or hirsutism).

Q: What is the most common indication for heart transplant?

Dilated cardiomyopathy. **Explanation:** **Correct Answer: A. Dilated cardiomyopathy** Heart transplantation is the definitive treatment for end-stage heart failure that is refractory to medical management. Globally, the most common indication for heart transplantation in adults is **Dilated Cardiomyopathy (DCM)**, followed closely by Ischemic Cardiomyopathy. DCM leads to progressive ventricular enlargement and systolic dysfunction, eventually reaching a point where the heart can no longer maintain adequate cardiac output. **Analysis of Incorrect Options:** * **B. Myocardial Infarction (MI):** While acute MI is a leading cause of death, it is managed with reperfusion (PCI/CABG). It only leads to transplant if it results in chronic, end-stage **Ischemic Cardiomyopathy**. * **C. Hypertrophic cardiomyopathy (HCM):** Although HCM can lead to heart failure or sudden cardiac death, it is a much less frequent indication for transplant compared to the high prevalence of DCM. * **D. Tetralogy of Fallot (TOF):** This is a congenital cyanotic heart disease usually managed with surgical repair (Blalock-Taussig shunt or total correction) in infancy/childhood. Congenital heart diseases are the most common indication in the **pediatric** age group, but not the overall population. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication (Adults):** Dilated Cardiomyopathy. * **Most common indication (Pediatrics):** Congenital Heart Disease. * **Gold Standard for Diagnosis of Rejection:** Endomyocardial biopsy (usually taken from the right ventricle). * **Denervated Heart:** A transplanted heart lacks autonomic nerve supply; therefore, it does not respond to Atropine, and patients do not experience classic angina (silent ischemia). * **Most common cause of late death:** Cardiac Allograft Vasculopathy (CAV).

Q: Which of the following is an absolute contraindication to liver transplantation?

AIDS. **Explanation:** In liver transplantation, contraindications are categorized into **absolute** (conditions where the risk of surgery or post-transplant failure is prohibitively high) and **relative** (conditions that increase risk but can be managed). **Why AIDS is the Correct Answer:** Historically, **AIDS** (defined by low CD4 counts and opportunistic infections) is considered an **absolute contraindication**. The primary concern is that the mandatory post-transplant immunosuppression will further deplete the immune system, leading to uncontrollable opportunistic infections and poor survival. While HIV-positive patients with well-controlled viral loads and high CD4 counts are now being transplanted in specialized centers, "AIDS" as a clinical stage remains a classic absolute contraindication in standard surgical textbooks and NEET-PG curricula. **Analysis of Incorrect Options:** * **Age >70 (Relative):** While advanced age increases the risk of cardiovascular complications, it is not an absolute cutoff. "Physiological age" is prioritized over "chronological age." * **Portal Vein Thrombosis (Relative):** Previously a contraindication, it is now managed using thrombectomy or venous bypass techniques during the transplant. * **Severe Obesity (Relative):** While BMI >35-40 increases the risk of wound infections and metabolic complications, it is a relative contraindication that requires pre-operative weight management. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Extrahepatic malignancy, active extrahepatic sepsis, advanced cardiopulmonary disease, and active substance/alcohol abuse. * **MELD Score:** Used for prioritizing patients on the waiting list (based on Bilirubin, Creatinine, and INR). * **Milan Criteria:** Used to determine eligibility for patients with Hepatocellular Carcinoma (Single lesion ≤5cm or up to 3 lesions each ≤3cm).

Question 1

After the first postoperative year of cardiac transplantation, what is the most common cause of death?

Accepted Answer

Accelerated graft arteriosclerosis

Answer

Infection

Answer

Arrhythmia

Answer

Acute rejection episode

Question 2

Infection in a renal transplant patient is usually caused by which pathogen?

Accepted Answer

Cytomegalovirus (CMV)

Answer

Human Immunodeficiency Virus (HIV)

Answer

Herpes Simplex Virus (HSV)

Answer

Salmonella

Question 3

What type of graft is a graft from a sister to a brother?

Accepted Answer

Allograft

Answer

Isograft

Answer

Autograft

Answer

Heterograft

Question 4

Compared to early immunosuppressive drugs such as azathioprine, steroids, and anti-lymphocyte serum, what specific advantages do newer immunosuppressive agents offer?

Accepted Answer

Tacrolimus (FK506) shares properties with cyclosporine but is particularly useful for rescuing grafts failing under cyclosporine therapy.

Answer

Cyclosporine interferes with lymphokine production and has neither bone marrow nor renal toxicity.

Answer

Monoclonal antibody (OKT3) is more available, more specific, and has fewer side effects than anti-lymphocyte serum.

Answer

None of the above.

Question 5

A parathyroid gland is implanted into the forearm muscle. What type of transplantation is this?

Accepted Answer

Heterotopic

Answer

Orthotopic

Answer

Auxiliary

Answer

None of the above

Question 6

Which of the following is not a component of the University of Wisconsin solution?

Accepted Answer

Potassium citrate

Answer

Adenosine

Answer

Glutathione

Answer

Allopurinol

Question 7

Which immunosuppressive drug is commonly given after renal transplantation?

Accepted Answer

Corticosteroids

Answer

Cyclophosphamide

Answer

Interferon

Answer

All of the above

Question 8

What is the most common indication for heart transplant?

Accepted Answer

Dilated cardiomyopathy

Answer

Myocardial Infarction (MI)

Answer

Hypertrophic cardiomyopathy

Answer

Tetralogy of Fallot (TOF)

Question 9

In which of the following conditions is liver transplantation indicated?

Accepted Answer

Primary biliary cirrhosis

Answer

Hemochromatosis

Answer

Sclerosing cholangitis without ulcerative colitis

Answer

Sclerosing cholangitis with ulcerative colitis

Question 10

Which of the following is an absolute contraindication to liver transplantation?

Accepted Answer

AIDS

Answer

Age >70

Answer

Portal vein thrombosis

Answer

Severe obesity

Transplant Surgery — MCQs

Transplant Surgery — MCQs

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