Long-term complications of transplantation US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Long-term complications of transplantation. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Long-term complications of transplantation US Medical PG Question 1: Two weeks after undergoing allogeneic stem cell transplant for multiple myeloma, a 55-year-old man develops a severely pruritic rash, abdominal cramps, and profuse diarrhea. He appears lethargic. Physical examination shows yellow sclerae. There is a generalized maculopapular rash on his face, trunk, and lower extremities, and desquamation of both soles. His serum alanine aminotransferase is 115 U/L, serum aspartate aminotransferase is 97 U/L, and serum total bilirubin is 2.7 mg/dL. Which of the following is the most likely underlying cause of this patient's condition?
- A. Preformed cytotoxic anti-HLA antibodies
- B. Proliferating transplanted B cells
- C. Activated recipient T cells
- D. Donor T cells in the graft (Correct Answer)
- E. Newly formed anti-HLA antibodies
Long-term complications of transplantation Explanation: ***Donor T cells in the graft***
- The symptoms (rash, GI symptoms, liver dysfunction) after an allogeneic stem cell transplant are classic signs of **acute graft-versus-host disease (GVHD)**. This condition occurs when **immunocompetent T cells from the donor graft** recognize the recipient's tissues as foreign and mount an immune attack.
- The rapid onset within two weeks post-transplant, elevated liver enzymes, jaundice (**yellow sclerae**, **elevated bilirubin**), severe pruritic rash, and GI symptoms (**abdominal cramps**, **profuse diarrhea**) are all characteristic manifestations of acute GVHD.
*Preformed cytotoxic anti-HLA antibodies*
- Preformed antibodies would typically cause **hyperacute rejection**, which occurs within minutes to hours of transplantation and involves widespread thrombosis and necrosis of the graft, not the systemic symptoms seen here.
- This reaction is mediated by the recipient's antibodies attacking donor antigens, leading to immediate graft failure.
*Proliferating transplanted B cells*
- Transplanted B cells can contribute to chronic GVHD through antibody production, but they are not the primary mediators of **acute GVHD**; acute GVHD is predominantly a T cell-mediated process.
- Proliferation of donor B cells is more commonly associated with post-transplant lymphoproliferative disorders (PTLD) or chronic GVHD, not the acute presentation described.
*Activated recipient T cells*
- In an allogeneic transplant, the recipient's immune system is usually heavily suppressed beforehand to prevent host-versus-graft rejection.
- If recipient T cells were active, they would primarily cause **rejection of the donor stem cells** (graft rejection), not the systemic symptoms of GVHD, which is a reaction of the donor cells against the host.
*Newly formed anti-HLA antibodies*
- Newly formed antibodies the recipient develops against the donor's HLA antigens would cause graft rejection, a process often delayed but not presenting as the widespread organ damage of acute GVHD.
- These antibodies are part of the host's attempt to reject the foreign graft, not the donor cells attacking the host.
Long-term complications of transplantation US Medical PG Question 2: A 31-year-old female receives a kidney transplant for autosomal dominant polycystic kidney disease (ADPKD). Three weeks later, the patient experiences acute, T-cell mediated rejection of the allograft and is given sirolimus. Which of the following are side effects of this medication?
- A. Nephrotoxicity, hypertension
- B. Hyperlipidemia, thrombocytopenia (Correct Answer)
- C. Nephrotoxicity, gingival hyperplasia
- D. Pancreatitis
- E. Cytokine release syndrome, hypersensitivity reaction
Long-term complications of transplantation Explanation: ***Hyperlipidemia, thrombocytopenia***
- **Sirolimus** (rapamycin) is an **mTOR inhibitor** commonly used in transplant immunology, which frequently causes **hyperlipidemia** (elevated cholesterol and triglycerides) and **thrombocytopenia** (low platelet count).
- Other common side effects include **myelosuppression** (leukopenia, anemia), **mouth ulcers**, and **impaired wound healing**.
*Nephrotoxicity, hypertension*
- **Nephrotoxicity** and **hypertension** are more characteristic side effects of **calcineurin inhibitors** like **tacrolimus** and **cyclosporine**, which are also used in transplant immunosuppression but have a different mechanism of action than sirolimus.
- While sirolimus can indirectly affect kidney function, it is generally considered less nephrotoxic than calcineurin inhibitors.
*Nephrotoxicity, gingival hyperplasia*
- **Gingival hyperplasia** is a hallmark side effect of **cyclosporine**, a calcineurin inhibitor, along with **hirsutism** and **nephrotoxicity**.
- Sirolimus does not typically cause gingival hyperplasia.
*Pancreatitis*
- While some immunosuppressants can rarely cause pancreatitis, it is not a common or characteristic side effect of **sirolimus**.
- **Azathioprine** is more frequently associated with pancreatitis among immunosuppressive agents.
*Cytokine release syndrome, hypersensitivity reaction*
- **Cytokine release syndrome** and acute **hypersensitivity reactions** are more often associated with **monoclonal antibodies** (e.g., **basiliximab**, **daclizumab**) used for induction therapy or treatment of acute rejection, particularly within hours or days of administration.
- Sirolimus is less likely to cause these immediate severe reactions.
Long-term complications of transplantation US Medical PG Question 3: Twelve days after undergoing a cadaveric renal transplant for adult polycystic kidney disease, a 23-year-old man has pain in the right lower abdomen and generalized fatigue. During the past 4 days, he has had decreasing urinary output. Creatinine concentration was 2.3 mg/dL on the second postoperative day. Current medications include prednisone, cyclosporine, azathioprine, and enalapril. His temperature is 38°C (100.4°F), pulse is 103/min, and blood pressure is 168/98 mm Hg. Examination reveals tenderness to palpation on the graft site. Creatinine concentration is 4.3 mg/dL. A biopsy of the transplanted kidney shows tubulitis. C4d staining is negative. Which of the following is the most likely cause of this patient's findings?
- A. Drug-induced nephrotoxicity
- B. Allorecognition with T cell activation (Correct Answer)
- C. Irreversible fibrosis of the glomerular vessels
- D. Donor T cells from the graft
- E. Preformed cytotoxic antibodies against class I HLA
Long-term complications of transplantation Explanation: ***Allorecognition with T cell activation***
- The patient's symptoms (pain at graft site, fatigue, decreasing urinary output, elevated creatinine) 12 days post-transplant, along with **tubulitis on biopsy** and negative **C4d staining**, are indicative of acute cellular rejection, mediated primarily by **T-cell recognition of donor HLA antigens**.
- **Hypertension** and **fever** also support acute rejection, and the immunosuppressive regimen may not be fully effective in preventing this T-cell mediated response.
*Drug-induced nephrotoxicity*
- While cyclosporine and enalapril can cause kidney injury, the **histological finding of tubulitis** is highly specific for acute cellular rejection, not typically seen with drug-induced nephrotoxicity alone.
- Drug-induced nephrotoxicity usually presents with a more **gradual rise in creatinine** and may lack the systemic signs like fever or the specific pathological features of rejection.
*Irreversible fibrosis of the glomerular vessels*
- This description is more consistent with **chronic allograft nephropathy** or long-term damage, which typically develops months to years after transplantation, not within 12 days.
- The findings described (pain, fever, tubulitis) point to an acute process, not chronic fibrosis.
*Donor T cells from the graft*
- This scenario describes **graft-versus-host disease (GVHD)**, which is rare in solid organ transplantation due to the much smaller lymphocyte load compared to bone marrow transplants.
- GVHD typically affects the skin, liver, and gut, and while it involves T-cell mediated injury, the primary damage in renal transplant rejection is directed at the transplanted kidney by the recipient's immune system.
*Preformed cytotoxic antibodies against class I HLA*
- This describes **hyperacute rejection**, which occurs within minutes to hours of transplantation due to pre-existing antibodies in the recipient against donor antigens.
- The patient's symptoms developing 12 days post-transplant, along with the biopsy showing tubulitis and negative C4d staining (indicating absence of significant antibody-mediated complement activation), rule out hyperacute rejection.
Long-term complications of transplantation US Medical PG Question 4: A 57-year-old woman comes to the clinic complaining of decreased urine output. She reports that over the past 2 weeks she has been urinating less and less every day. She denies changes in her diet or fluid intake. The patient has a history of lupus nephritis, which has resulted in end stage renal disease. She underwent a renal transplant 2 months ago. Since then she has been on mycophenolate and cyclosporine, which she takes as prescribed. The patient’s temperature is 99°F (37.2°C), blood pressure is 172/102 mmHg, pulse is 88/min, and respirations are 17/min with an oxygen saturation of 97% on room air. Labs show an elevation in serum creatinine and blood urea nitrogen. On physical examination, she has 2+ pitting edema of the bilateral lower extremities. Lungs are clear to auscultation. Urinalysis shows elevated protein. A post-void bladder scan is normal. A renal biopsy is obtained, which shows lymphocyte infiltration and intimal swelling. Which of the following is the next best step in management?
- A. Add diltiazem
- B. Nephrectomy
- C. Start intravenous steroids (Correct Answer)
- D. Add ceftriaxone
- E. Discontinue cyclosporine
Long-term complications of transplantation Explanation: ***Start intravenous steroids***
- The patient presents with **decreased urine output**, elevated creatinine, and a recent kidney transplant with biopsy showing **lymphocyte infiltration** and **intimal swelling**, all highly suggestive of **acute cellular rejection**.
- **High-dose intravenous steroids** (e.g., methylprednisolone) are the first-line treatment for acute cellular rejection to suppress the immune response and preserve graft function.
*Add diltiazem*
- **Diltiazem** is a calcium channel blocker used to treat hypertension and arrhythmias, and it can also interfere with cyclosporine metabolism, potentially increasing its levels.
- While the patient has elevated blood pressure, adding diltiazem would not address the underlying **immune rejection** and would not be the primary intervention.
*Nephrectomy*
- **Nephrectomy** involves surgical removal of the transplanted kidney. This radical intervention is reserved for **irreversible graft failure** or severe complications like overwhelming infection or malignancy.
- Given the acute presentation and possibility of reversing rejection with immunosuppression, nephrectomy is **premature** and not the next best step.
*Add ceftriaxone*
- **Ceftriaxone** is an antibiotic used to treat bacterial infections.
- There is no clinical evidence in the stem (e.g., fever, signs of infection) to suggest a **bacterial infection** as the cause of her symptoms, making antibiotics inappropriate.
*Discontinue cyclosporine*
- **Cyclosporine** is an immunosuppressant essential for preventing transplant rejection. Discontinuing it would immediately increase the risk of more severe and potentially **irreversible rejection**.
- While cyclosporine can cause nephrotoxicity, the biopsy findings of **cellular infiltration** point more towards rejection rather than primary drug toxicity, and the primary treatment for rejection involves increasing immunosuppression, not withdrawing it.
Long-term complications of transplantation US Medical PG Question 5: A 46-year-old man comes to the physician because of a 4-month history of progressively worsening fatigue and loss of appetite. Five years ago, he received a kidney transplant from a living family member. Current medications include sirolimus and mycophenolate. His blood pressure is 150/95 mm Hg. Laboratory studies show normocytic, normochromic anemia and a serum creatinine concentration of 3.1 mg/dL; his vital signs and laboratory studies were normal 6 months ago. Which of the following is the most likely underlying mechanism of this patient’s increase in creatinine concentration?
- A. Drug-induced tubular vacuolization
- B. CD8+ T cell-mediated parenchymal cell damage
- C. CD4+ T cell-mediated intimal smooth muscle proliferation (Correct Answer)
- D. Donor T cell-mediated epithelial cell damage
- E. Donor endothelial cell damage by preformed host antibodies
Long-term complications of transplantation Explanation: ***CD4+ T cell-mediated intimal smooth muscle proliferation***
- The patient's history of a kidney transplant 5 years ago, worsening fatigue, loss of appetite, elevated blood pressure (150/95 mm Hg), and a significant increase in serum creatinine from normal to 3.1 mg/dL, along with normocytic, normochromic anemia, strongly suggests **chronic rejection** of the renal allograft.
- **Chronic rejection** in kidney transplantation is primarily mediated by **CD4+ T cells** which induce injury to vessel walls, leading to **intimal smooth muscle proliferation** and progressive obliteration of the vascular lumen, causing chronic ischemia and graft dysfunction.
*Drug-induced tubular vacuolization*
- **Drug-induced tubular vacuolization** can occur with medications like sirolimus, but it typically presents with **acute kidney injury** and specific biopsy findings, not the progressive, chronic decline seen here.
- While sirolimus can cause nephrotoxicity, the clinical picture of hypertension, anemia, and a gradual increase in creatinine over months, years after transplant, is more indicative of chronic rejection rather than a primary direct tubular injury.
*CD8+ T cell-mediated parenchymal cell damage*
- **CD8+ T cell-mediated parenchymal cell damage** is characteristic of **acute cellular rejection** and typically presents with a more rapid onset of graft dysfunction and specific histological features like tubulitis and interstitial inflammation.
- This patient's symptoms have developed progressively over 4 months, which is more consistent with chronic rather than acute processes.
*Donor T cell-mediated epithelial cell damage*
- **Donor T cell-mediated epithelial cell damage** is associated with **graft-versus-host disease (GVHD)**, which primarily occurs after **hematopoietic stem cell transplantation**, not solid organ transplants like a kidney.
- GVHD manifests in organs like the skin, liver, and GI tract, not typically as isolated chronic allograft nephropathy.
*Donor endothelial cell damage by preformed host antibodies*
- **Donor endothelial cell damage by preformed host antibodies** is the mechanism of **hyperacute rejection**, which occurs within minutes to hours post-transplant due to pre-existing host antibodies (e.g., ABO incompatible, preformed anti-HLA antibodies) and leads to immediate graft failure.
- The patient had a successful transplant 5 years ago and developed symptoms gradually, ruling out hyperacute rejection.
Long-term complications of transplantation US Medical PG Question 6: Several weeks following a kidney transplantation, a 50-year-old Caucasian female presents for evaluation of the transplanted organ. Biopsy shows inflammation involving the endothelial cells of the kidney vasculature and the presence of mononuclear cells in the interstitium. Which cells are most likely responsible for this presentation?
- A. Recipient T-cells (Correct Answer)
- B. Donor antibodies
- C. Preformed recipient antibodies
- D. Deposition of antibody immune complexes
- E. Donor T-cells
Long-term complications of transplantation Explanation: ***Recipient T-cells***
- The presence of **mononuclear cells in the interstitium** and inflammation of the **endothelial cells** several weeks post-transplantation is characteristic of **acute cellular rejection (ACR)**.
- ACR is primarily mediated by the recipient's **cytotoxic T-cells** recognizing donor major histocompatibility complex (MHC) molecules on graft cells.
*Donor antibodies*
- Donor antibodies are not responsible for rejection; rather, recipient antibodies (either preformed or newly formed) are implicated.
- The donor's immune system is suppressed or non-existent in the context of the transplanted organ itself after removal from the donor.
*Preformed recipient antibodies*
- While preformed recipient antibodies cause **hyperacute rejection**, which occurs minutes to hours after transplant, the presentation here is several weeks later.
- Hyperacute rejection involves widespread thrombosis and necrosis due to rapid antibody-mediated complement activation within the graft vasculature.
*Deposition of antibody immune complexes*
- Immune complex deposition typically causes a different pattern of injury (e.g., glomerulonephritis) and is not the primary mechanism of acute cellular rejection.
- This mechanism is more associated with certain autoimmune diseases or chronic transplant rejection, not the acute phase described.
*Donor T-cells*
- Donor T-cells would not be attacking the transplanted organ since it is *their own tissue*.
- Donor T-cells can cause **graft-versus-host disease (GVHD)** in bone marrow transplantation, where immunocompetent donor T-cells attack recipient tissues, but this is not applicable to solid organ transplantation.
Long-term complications of transplantation US Medical PG Question 7: A 50-year-old woman comes to the physician for the evaluation of excessive hair growth on her chin over the past 2 weeks. She also reports progressive enlargement of her gums. Three months ago, she underwent a liver transplantation due to Wilson disease. Following the procedure, the patient was started on transplant rejection prophylaxis. She has a history of poorly-controlled type 2 diabetes mellitus. Temperature is 37°C (98.6°F), pulse is 80/min, respirations are 22/min, and blood pressure is 150/80 mm Hg. Physical examination shows dark-pigmented, coarse hair on the chin, upper lip, and chest. The gingiva and the labial mucosa are swollen. There is a well-healed scar on her right lower abdomen. Which of the following drugs is the most likely cause of this patient's findings?
- A. Daclizumab
- B. Cyclosporine (Correct Answer)
- C. Sirolimus
- D. Methotrexate
- E. Tacrolimus
Long-term complications of transplantation Explanation: **Cyclosporine**
* This patient's **combination of hirsutism** (excessive hair growth) **and gingival hyperplasia** (gum enlargement) is the classic presentation of cyclosporine toxicity, an immunosuppressant commonly used for transplant rejection prophylaxis.
* Cyclosporine is a **calcineurin inhibitor** that prevents T-cell activation and is highly effective in preventing graft rejection.
* The **simultaneous presence of both hirsutism and prominent gingival hyperplasia** is particularly characteristic of cyclosporine.
*Daclizumab*
* **Daclizumab** is a **monoclonal antibody** targeting the IL-2 receptor, which was previously used for transplant prophylaxis but has been discontinued for this indication.
* It is not associated with hirsutism or gingival hyperplasia.
*Sirolimus*
* **Sirolimus** is an **mTOR inhibitor** used as an immunosuppressant, known for side effects like hyperlipidemia, myelosuppression, and delayed wound healing.
* It does **not** typically cause hirsutism or gingival hyperplasia.
*Methotrexate*
* **Methotrexate** is an **antimetabolite** and immunosuppressant commonly used in autoimmune diseases and cancer, with side effects including bone marrow suppression, mucositis, and liver toxicity.
* Hirsutism and gingival hyperplasia are **not** characteristic side effects of methotrexate.
*Tacrolimus*
* **Tacrolimus** is another **calcineurin inhibitor**, similar to cyclosporine, but with a different side effect profile. While tacrolimus can cause hirsutism, **gingival hyperplasia is significantly less common** with tacrolimus compared to cyclosporine.
* The **presence of prominent gingival hyperplasia alongside hirsutism strongly favors cyclosporine** over tacrolimus.
* Tacrolimus is more commonly associated with **neurotoxicity** (e.g., tremor) and **nephrotoxicity**.
Long-term complications of transplantation US Medical PG Question 8: Fourteen days after a laparoscopic cholecystectomy for cholelithiasis, a 45-year-old woman comes to the emergency department because of persistent episodic epigastric pain for 3 days. The pain radiates to her back, occurs randomly throughout the day, and is associated with nausea and vomiting. Each episode lasts 30 minutes to one hour. Antacids do not improve her symptoms. She has hypertension and fibromyalgia. She has smoked 1–2 packs of cigarettes daily for the past 10 years and drinks 4 cans of beer every week. She takes lisinopril and pregabalin. She appears uncomfortable. Her temperature is 37°C (98.6° F), pulse is 84/min, respirations are 14/min, and blood pressure is 127/85 mm Hg. Abdominal examination shows tenderness to palpation in the upper quadrants without rebound or guarding. Bowel sounds are normal. The incisions are clean, dry, and intact. Serum studies show:
AST 80 U/L
ALT 95 U/L
Alkaline phosphatase 213 U/L
Bilirubin, total 1.3 mg/dL
Direct 0.7 mg/dL
Amylase 52 U/L
Abdominal ultrasonography shows dilation of the common bile duct and no gallstones. Which of the following is the most appropriate next step in management?
- A. Counseling on alcohol cessation
- B. Endoscopic retrograde cholangiopancreatography (Correct Answer)
- C. Proton pump inhibitor therapy
- D. CT scan of the abdomen
- E. Reassurance and follow-up in 4 weeks
Long-term complications of transplantation Explanation: ***Endoscopic retrograde cholangiopancreatography***
- The patient's symptoms (epigastric pain radiating to the back, nausea, vomiting, elevated liver enzymes, and **common bile duct (CBD) dilation** on ultrasound after cholecystectomy) are highly suggestive of **postcholecystectomy syndrome**, specifically due to a retained or de novo **CBD stone** or **sphincter of Oddi dysfunction**.
- **ERCP** is both diagnostic and therapeutic in this setting, allowing for visualization of the bile ducts, stone extraction (if present), or sphincterotomy.
*Counseling on alcohol cessation*
- While **alcohol cessation** is beneficial for overall health, especially with a history of alcohol use, it is not the most immediate or appropriate next step for the acute and severe symptoms presented.
- The patient's symptoms are more indicative of a **biliary obstruction** rather than alcohol-related chronic pancreatitis or liver disease, given the acute onset post-surgery.
*Proton pump inhibitor therapy*
- **PPI therapy** is used for acid-related disorders such as GERD or peptic ulcers, which typically present with burning epigastric pain that improves with antacids.
- This patient's pain radiates to the back, is associated with nausea and vomiting, does not improve with antacids, and has abnormal imaging/labs (CBD dilation, elevated liver enzymes), ruling out a simple acid-related issue.
*CT scan of the abdomen*
- An abdominal **CT scan** could provide more detailed imaging but is generally less effective than ERCP for evaluating **biliary duct pathology** and is not therapeutic.
- Given the ultrasound findings of **CBD dilation** and the patient's symptoms, a more invasive but definitive diagnostic and therapeutic procedure is warranted.
*Reassurance and follow-up in 4 weeks*
- The patient is experiencing severe, persistent symptoms with abnormal liver enzymes and imaging findings indicating **biliary obstruction** post-cholecystectomy.
- **Reassurance and delayed follow-up** would be inappropriate and could lead to worsening of her condition, including cholangitis or pancreatitis if left untreated.
Long-term complications of transplantation US Medical PG Question 9: A 38-year-old kidney transplant recipient maintained on tacrolimus presents with a 2-week history of progressive confusion, ataxia, and visual disturbances. MRI shows multifocal white matter lesions without mass effect or enhancement. CSF analysis reveals mild pleocytosis with elevated protein. JC virus DNA is detected in CSF by PCR. Serum tacrolimus level is therapeutic at 8 ng/mL. Apply knowledge of this condition to determine the appropriate management strategy.
- A. Significantly reduce or discontinue immunosuppression and provide supportive care (Correct Answer)
- B. Switch from tacrolimus to sirolimus to preserve graft while treating infection
- C. Continue current immunosuppression and administer IVIG therapy
- D. Maintain immunosuppression and start cidofovir antiviral therapy
- E. Reduce tacrolimus by 50% and start high-dose corticosteroids
Long-term complications of transplantation Explanation: ***Significantly reduce or discontinue immunosuppression and provide supportive care***
- The patient presents with **Progressive Multifocal Leukoencephalopathy (PML)** caused by **JC virus** reactivation; the primary treatment is **immune reconstitution** to allow the body to fight the virus.
- Reducing or stopping agents like **tacrolimus** is critical for survival, even though it carries a high risk of **allograft rejection**.
*Switch from tacrolimus to sirolimus to preserve graft while treating infection*
- While **sirolimus** has some antiproliferative effects, it is still an **immunosuppressant** and will not allow for the aggressive immune recovery needed to halt **JC virus** replication.
- Managing the life-threatening neurological condition takes precedence over **graft preservation** in the acute phase of PML.
*Continue current immunosuppression and administer IVIG therapy*
- Maintaining current levels of **tacrolimus** prevents the T-cell mediated response necessary to clear the **JC virus** from the CNS.
- **IVIG therapy** has not been proven effective in clinical trials for the treatment of PML and does not address the underlying **immunosuppressed state**.
*Maintain immunosuppression and start cidofovir antiviral therapy*
- **Cidofovir** was previously studied for PML, but it has failed to show significant clinical benefit and is associated with severe **nephrotoxicity**.
- Antiviral therapy without addressing the **cellular immune deficiency** is insufficient to treat this opportunistic infection.
*Reduce tacrolimus by 50% and start high-dose corticosteroids*
- Adding **high-dose corticosteroids** is contraindicated as it further suppresses the immune system, potentially accelerating the progression of **PML**.
- Steroids are typically reserved only for patients who develop **Immune Reconstitution Inflammatory Syndrome (IRIS)** after immunosuppression is withdrawn.
Long-term complications of transplantation US Medical PG Question 10: A 41-year-old heart transplant recipient (5 years post-transplant) on cyclosporine, azathioprine, and prednisone develops progressive dyspnea on exertion. Echocardiogram shows preserved ejection fraction but abnormal diastolic dysfunction. Right heart catheterization reveals elevated filling pressures. Endomyocardial biopsy shows interstitial fibrosis without significant cellular infiltration. Coronary angiography shows diffuse, concentric narrowing of distal vessels. Synthesize these findings to determine the underlying pathophysiology and evaluate management options.
- A. Cardiac allograft vasculopathy requiring consideration for retransplantation evaluation (Correct Answer)
- B. Restrictive cardiomyopathy from previous rejection episodes requiring diuretic therapy
- C. Drug-induced cardiomyopathy from calcineurin inhibitor toxicity requiring switch to mTOR inhibitor
- D. Acute cellular rejection requiring pulse steroids and optimization of immunosuppression
- E. Antibody-mediated rejection requiring plasmapheresis and rituximab therapy
Long-term complications of transplantation Explanation: ***Cardiac allograft vasculopathy requiring consideration for retransplantation evaluation***
- **Cardiac allograft vasculopathy (CAV)** is the leading cause of late graft failure, characterized by **diffuse, concentric intimal hyperplasia** and narrowing of the distal coronary vessels.
- The presentation of **progressive dyspnea**, diastolic dysfunction, and **interstitial fibrosis** on biopsy—without acute cellular or antibody-mediated rejection—is pathognomonic for advanced CAV, where **retransplantation** remains the definitive surgical option.
*Restrictive cardiomyopathy from previous rejection episodes requiring diuretic therapy*
- While **interstitial fibrosis** can mimic a restrictive phenotype, this option overlooks the specific **angiographic finding** of distal concentric narrowing which points directly to CAV.
- **Diuretic therapy** may provide symptomatic relief for heart failure but does not address the underlying **progressive vasculopathy** and graft failure.
*Drug-induced cardiomyopathy from calcineurin inhibitor toxicity requiring switch to mTOR inhibitor*
- **Cyclosporine** (a calcineurin inhibitor) primarily causes **nephrotoxicity** and hypertension rather than direct cardiomyopathy with concentric vascular narrowing.
- While **mTOR inhibitors** (like Sirolimus) are used to slow the progression of CAV, they do not resolve established diffuse vascular disease with hemodynamic compromise.
*Acute cellular rejection requiring pulse steroids and optimization of immunosuppression*
- **Acute cellular rejection** is excluded by the endomyocardial biopsy, which specifically showed **no significant cellular infiltration**.
- This condition typically occurs earlier in the post-transplant period and would show **lymphocytic infiltration** and myocyte necrosis rather than concentric vessel narrowing.
*Antibody-mediated rejection requiring plasmapheresis and rituximab therapy*
- **Antibody-mediated rejection (AMR)** is characterized by **capillary endothelial injury** and C4d deposition on biopsy, which were not described in this patient.
- AMR typically presents with more acute graft dysfunction rather than the **slowly progressive** course and distal vessel pruning seen in this case.
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