Pre-Transplant Preparations

Your journey toward an islet cell transplant begins weeks or even months before your hospital admission. The pre‑transplant evaluation is a comprehensive, multi‑disciplinary process designed to confirm that you are a suitable candidate and to minimize any risks. You can expect the following elements during this phase.

Medical Testing

Your transplant team will order a battery of tests to assess your overall health and the status of your diabetes. These typically include:

  • HbA1c and continuous glucose monitoring (CGM) data to document baseline glycemic control and the severity of hypoglycemia unawareness.
  • C‑peptide levels to measure your body’s own insulin production. Because islet transplants are intended for patients with little or no endogenous insulin, a very low or undetectable C‑peptide is required.
  • Renal function tests (serum creatinine, eGFR, urinalysis) to ensure your kidneys can tolerate the immunosuppressive medications that will be used after transplant.
  • Liver function and coagulation panels because the transplant procedure involves infusing cells into your liver’s portal vein; any pre‑existing liver disease or clotting disorder must be identified and managed.
  • Cardiac evaluation (electrocardiogram, echocardiogram, and possibly a stress test) to assess your heart’s ability to handle the procedure and subsequent immunosuppression.
  • Infectious disease screening for viruses such as CMV, EBV, HIV, hepatitis B and C, and tuberculosis. You will also be checked for immunity to vaccine‑preventable diseases, and your immunization records will be updated as needed.

Psychological and Social Evaluation

An islet cell transplant demands a lifelong commitment to immunosuppression, frequent clinic visits, and self‑monitoring. A psychologist or social worker will meet with you to discuss:

  • Your understanding of the risks and benefits
  • Your support system at home and ability to adhere to a complex medication regimen
  • Any history of depression, anxiety, or substance use that could affect recovery
  • Financial and insurance considerations

Medication Adjustments

Your current medications will be reviewed and modified. For example:

  • Immunosuppressive or immunomodulatory drugs may need to be stopped or changed well in advance.
  • Anticoagulants or antiplatelet agents (e.g., warfarin, clopidogrel, aspirin) are often paused to reduce bleeding risk during the procedure.
  • Insulin regimens are usually continued but may be adjusted to maintain stable glucose control in the days before transplant.

Your transplant coordinator will give you a detailed checklist and calendar of appointments. Being fully prepared at home—arranging time off work, organizing a support network, and packing essential items for the hospital stay—can significantly ease the transition.

Day of Admission

The day you are admitted to the hospital marks the beginning of a closely supervised process. Here is what typically occurs from the moment you arrive.

You will present to the transplant unit’s admitting office, where staff will verify your identity, confirm the planned procedure, and review your consent forms. You will be asked to sign updated consent documents that detail the surgical procedure, the experimental nature (if applicable), known risks, and post‑transplant requirements.

Pre‑Procedure Preparation

Once settled in your room, nursing staff will:

  • Take your vital signs (blood pressure, heart rate, oxygen saturation, temperature).
  • Record a baseline weight and urine output.
  • Insert an intravenous (IV) line for fluids and medications.
  • Place a peripheral or central venous catheter as ordered by the transplant team.

You will change into a hospital gown. A preoperative bath or shower with an antimicrobial soap may be required to reduce the risk of infection. You may also receive a dose of prophylactic antibiotics and an anti‑emetic to prevent nausea.

Final Pre‑Transplant Checks

Your surgeon and anesthesiologist will visit to review the plan and answer any last‑minute questions. In the hours before the procedure, you will have a final set of blood draws, including a complete blood count, coagulation profile, and a type‑and‑screen in case a blood transfusion becomes necessary.

A light snack may be allowed early in the day, but you will be instructed to stop eating and drinking several hours before anesthesia. The transplant coordinator will confirm that the donor pancreas has arrived and that the islet isolation laboratory has yielded sufficient viable cells for infusion.

The Islet Cell Transplant Procedure

Understanding what happens in the operating room or interventional radiology suite can help you feel more prepared. The islet cell transplant is a minimally invasive procedure performed under moderate sedation or general anesthesia, depending on your center’s protocol.

How the Islet Cells Are Prepared

Before the procedure begins, donor pancreatic tissue is processed in a specialized laboratory. The islets (clusters of insulin‑producing beta cells) are isolated, purified, and tested for viability, sterility, and function. This process typically takes 4–8 hours. If the islet yield is insufficient, the transplant may be postponed or cancelled—your team will keep you informed every step of the way.

The Infusion Procedure

The actual transplant is performed by an interventional radiologist or transplant surgeon using ultrasound and fluoroscopic (X‑ray) guidance. Steps include:

  1. Accessing the portal vein – A thin catheter is inserted through a small incision in your upper abdomen or through a trans‑jugular approach (via the neck). The catheter tip is positioned in the main portal vein, which supplies blood to your liver.
  2. Monitoring portal pressure – Before infusing the cells, the team measures the pressure inside your portal vein. If it is too high, the risk of bleeding or thrombosis increases, and the team may reduce the infusion rate or volume.
  3. Infusing the islet cells – The purified islet cell suspension is slowly injected through the catheter. The cells lodge in the small branches of the portal vein (the sinusoids) where they will engraft and begin producing insulin.
  4. Post‑infusion checks – After the infusion, portal pressure is measured again. A small amount of contrast dye is injected to confirm that the vein remains open and that there is no extravasation or bleeding.

The entire procedure usually takes 1–2 hours. You will be asleep or heavily sedated and should feel no pain. Afterward, the catheter is removed and the incision site is closed with a stitch or a small bandage.

Immediate Recovery

You will be moved to a recovery room or a step‑down intensive care unit where nurses and physicians monitor you closely. Vital signs are checked every 15–30 minutes initially. The main goals in the first few hours are:

  • Prevent bleeding – Because the liver’s portal vein was catheterized, there is a risk of intra‑abdominal bleeding. You will be kept flat for 2–4 hours, and the medical team will frequently assess your abdomen for tenderness or distension.
  • Monitor liver function – Blood tests for liver enzymes (AST, ALT, bilirubin) are drawn at regular intervals to detect any signs of hepatic injury or thrombosis.
  • Manage blood glucose – Your blood sugar will be checked hourly, and an insulin drip may be continued to keep glucose levels within a target range. In some cases, glucose levels begin to drop within hours after the transplant as the new islets start to function.

Post‑Operative Care During Your Hospital Stay

For the days following the transplant, you will remain in the hospital under the care of an experienced team. The length of stay varies, but most patients are discharged after 5–10 days unless complications arise.

Immediate Post‑Transplant Monitoring

The first 48 hours are the most critical. Your care will include:

  • Vital signs every 2–4 hours – Fever, tachycardia, or hypotension may signal bleeding, infection, or a reaction to the infusion.
  • Daily blood work – Complete blood count, comprehensive metabolic panel (including liver function), coagulation profile, and C‑reactive protein. Tacrolimus (or another immunosuppressant) trough levels will be drawn to ensure you are in the therapeutic range.
  • Abdominal ultrasound – A Doppler ultrasound is typically performed within the first 24 hours to confirm patency of the portal vein and to look for any fluid collections or hematomas.
  • Continuous glucose monitoring – Many centers use a sensor that tracks glucose levels every 5 minutes. This helps the team detect hypoglycemia or severe hyperglycemia and adjust insulin or other treatments immediately.

Immunosuppressive Medication Regimen

To prevent rejection of the transplanted islet cells, you will begin taking immunosuppressive drugs. The most common protocol includes:

  • Induction therapy – An antibody‑based medication (e.g., anti‑thymocyte globulin or alemtuzumab) is given during and shortly after the transplant to deplete your immune system’s T‑cells.
  • Maintenance therapy – A combination of two oral drugs, typically tacrolimus (a calcineurin inhibitor) and mycophenolate mofetil. Some centers also use sirolimus. Corticosteroids are usually avoided because they can impair islet function and worsen glucose control.

These medications require careful monitoring for side effects, including high blood pressure, kidney damage, tremor, diarrhea, and increased risk of infection. Your team will adjust doses based on drug levels, kidney function, and how you are tolerating them.

Infection Prevention

Because immunosuppression weakens your immune system, you will be placed on strict infection‑prevention protocols:

  • Antiviral prophylaxis (e.g., valganciclovir) if you are at risk for CMV or EBV reactivation.
  • Antifungal and antibiotic prophylaxis, depending on your center’s guidelines.
  • Hand‑hygiene education and limited visitors.
  • Daily assessment of IV sites and surgical wounds for redness, swelling, or drainage.

Nutrition and Activity

You will start with a clear liquid diet and advance as tolerated. Once you are eating well, a dietitian will work with you to ensure adequate protein and calorie intake to support healing. Early mobilization—sitting up in bed, then walking with assistance—is encouraged to reduce the risk of blood clots and pneumonia.

Potential Risks and Complications

No procedure is without risk, and islet cell transplantation has specific complications you should understand.

  • Bleeding – Bleeding from the liver puncture site occurs in about 5–10% of patients. Most cases are mild and resolve with observation, but some require a blood transfusion or, rarely, an intervention.
  • Portal vein thrombosis – A clot can form in the portal vein, causing abdominal pain, liver dysfunction, or ascites. This risk is minimized by careful patient selection and anticoagulation, but it remains a serious concern.
  • Infection – Beyond the typical surgical site infections, the immunosuppressed patient is vulnerable to opportunistic infections such as cytomegalovirus (CMV) and Pneumocystis jirovecii pneumonia (PJP). Prophylactic medications are used to lower this risk.
  • Biliary or arterial injury – Rare but possible, given the proximity of the portal vein to bile ducts and hepatic arteries.
  • Nephrotoxicity – Tacrolimus can cause acute kidney injury or chronic kidney disease. Your team will monitor your creatinine closely and adjust doses or switch agents if needed.
  • Increased cancer risk – Long‑term immunosuppression raises the risk of certain cancers, especially skin cancer and post‑transplant lymphoproliferative disorder (PTLD). You will be advised to limit sun exposure and undergo routine cancer screening.
  • Metabolic effects – Sirolimus may cause hyperlipidemia or mouth ulcers; mycophenolate can cause gastrointestinal upset and bone marrow suppression.
  • Primary non‑function – In a small number of cases, the transplanted islet cells fail to produce enough insulin to make a clinical difference. The patient may need a second transplant or to continue insulin therapy.
  • Progressive graft loss – Over time, the islet graft may lose function due to chronic rejection, recurrent autoimmune attack, or the toxic effects of immunosuppressive drugs. Studies show that about 60–70% of patients remain insulin‑independent after one year, but this declines to 30–50% after five years.

Your transplant team will discuss these risks in detail during the consent process and answer any questions you have. Being informed empowers you to participate actively in your care.

Recovery and Follow‑Up After Discharge

Your hospital stay is only one part of the transplant journey. Ongoing care after discharge is essential to protect your graft and your overall health.

Outpatient Monitoring Schedule

You will be discharged with a detailed follow‑up plan:

  • Twice‑weekly clinic visits for the first month – Blood draws, drug level monitoring, and physical exams.
  • Weekly visits for the next two months – The interval between appointments is gradually extended if your condition remains stable.
  • Monthly visits after six months – Long‑term surveillance includes annual imaging of the liver and kidney function tests every three to six months.

Medication Adherence

Strict adherence to your immunosuppressive regimen is the single most important factor in graft survival. More than 90% of graft losses after the first year are associated with medication non‑adherence. Your pharmacist and transplant coordinator will help you set up a pill schedule, use a medication diary, and plan for refills. Never stop or change doses without consulting your team.

Lifestyle Modifications

To protect your graft and overall wellness, you will need to adopt several lifestyle changes:

  • Diabetes monitoring – Even if you achieve insulin independence, you will still need to check your blood glucose levels periodically and monitor for symptoms of hypo‑ or hyperglycemia. C‑peptide and HbA1c tests will be done at regular intervals to assess graft function.
  • Sun protection – Use SPF 50+ sunscreen, wear protective clothing, and avoid tanning beds to reduce the risk of skin cancer.
  • Vaccinations – Live vaccines (e.g., MMR, yellow fever, nasal flu vaccine) are contraindicated after transplant. You should receive inactivated vaccines (flu shot, pneumococcal, hepatitis B) as recommended by your team.
  • Diet and exercise – A heart‑healthy diet low in sodium and saturated fat helps manage the metabolic side effects of immunosuppression. Moderate physical activity (30 minutes most days) supports cardiovascular health and weight management.

When to Call the Transplant Team

Your team will give you clear instructions about “red‑flag” symptoms that require immediate attention:

  • Fever > 100.4°F (38°C) or chills
  • Abdominal pain, swelling, or tenderness
  • Nausea, vomiting, or persistent diarrhea
  • Signs of a blood clot (leg swelling, chest pain, shortness of breath)
  • Dark urine, yellowing of the skin or eyes, or unusual bleeding
  • Any new skin lesion that changes in size or color

Prompt reporting of these symptoms can prevent minor issues from becoming serious complications.

Conclusion

An islet cell transplant hospital stay involves meticulous preparation, a carefully performed procedure, and intensive post‑operative monitoring. While the process can feel overwhelming, knowing what each phase entails—from the pre‑transplant workup to the long‑term follow‑up—allows you to approach your treatment with confidence. Your healthcare team, including transplant surgeons, endocrinologists, nurses, and coordinators, is dedicated to supporting you at every step. With careful management, many patients achieve improved blood glucose control, reduced or eliminated insulin dependence, and a marked reduction in severe hypoglycemic episodes. For more information, you can explore resources from the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), the American Diabetes Association, and ClinicalTrials.gov to learn about ongoing studies and outcomes. Your journey toward a better quality of life starts with understanding what to expect and partnering actively with your transplant team.