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L-Histidine Hydrochloride

This article examines clinical trials investigating the use of L-Histidine Hydrochloride as a component in organ preservation and cardioplegia solutions. These solutions, such as Custodiol and Custodiol-N, are used to protect organs during transplantation procedures and heart surgeries. The trials aim to evaluate the safety and efficacy of these solutions in various medical contexts, including heart transplantation in children, major cardiac surgery, and organ transplantation for kidneys, liver, and pancreas.

Table of Contents

What is L-Histidine Hydrochloride?

L-Histidine Hydrochloride is an essential component found in organ preservation solutions used during transplantation procedures. It is a salt form of the amino acid L-Histidine, which plays a crucial role in maintaining the health and viability of organs during the preservation process[1].

Role in Organ Preservation

In organ transplantation, preserving the organ’s function during the time between removal from the donor and implantation in the recipient is critical. L-Histidine Hydrochloride contributes to this process in several ways:

  • pH Buffering: It helps maintain the optimal pH level in the preservation solution, preventing acidosis in the organ tissues.
  • Antioxidant Properties: L-Histidine acts as an antioxidant, protecting the organ from damage caused by free radicals during storage and transport.
  • Membrane Stabilization: It helps stabilize cell membranes, reducing the risk of cellular damage during the preservation period.

Custodiol and Custodiol-N

L-Histidine Hydrochloride is a key ingredient in two widely used organ preservation solutions: Custodiol and Custodiol-N[1].

Custodiol, also known as HTK solution (Histidine-Tryptophan-Ketoglutarate), is a crystalloid cardioplegia and organ preservation solution. It contains L-Histidine, L-Histidine Hydrochloride, and other components such as tryptophan, potassium chloride, and mannitol[2].

Custodiol-N is a newer formulation designed to potentially improve organ preservation outcomes. While its exact composition is not detailed in the provided information, it is being studied as an alternative to the standard Custodiol solution[3].

Clinical Applications

L-Histidine Hydrochloride, as part of Custodiol and Custodiol-N solutions, is used in various transplantation procedures, including:

  • Heart Transplantation: Used for myocardial protection during heart surgery and transplantation[1].
  • Kidney Transplantation: Helps preserve kidney function during the transplant process[4].
  • Liver Transplantation: Used to maintain liver viability during organ procurement and transplantation[4].
  • Pancreas Transplantation: Aids in preserving pancreatic tissue for transplantation, often in combination with kidney transplants[4].

Ongoing Research

Several clinical trials are currently investigating the efficacy and safety of Custodiol and Custodiol-N solutions containing L-Histidine Hydrochloride:

  • A study comparing Custodiol-N to standard Custodiol in pediatric heart transplantation[1].
  • Research on the use of Custodiol-N versus Custodiol in cardiac surgery for children with congenital heart defects[3].
  • A comparison of Custodiol crystalloid cardioplegia to Buckberg blood cardioplegia in major cardiac surgery[2].
  • A phase III study evaluating Custodiol-N against Custodiol in kidney, liver, and pancreas transplantation[4].

Safety and Efficacy

The ongoing clinical trials aim to assess the safety and efficacy of L-Histidine Hydrochloride-containing solutions in various transplantation scenarios. Key aspects being evaluated include:

  • Graft Function: Researchers are examining how well the preserved organs function after transplantation[4].
  • Organ Injury: Studies are measuring markers of organ damage to compare the protective effects of different preservation solutions[4].
  • Post-Operative Outcomes: Trials are tracking various outcomes such as mortality rates, graft survival, and complications[1][3][2].
  • Adverse Events: Continuous monitoring of adverse events is being conducted to ensure patient safety[1][3].

Conclusion

L-Histidine Hydrochloride plays a vital role in organ preservation solutions used in transplantation procedures. As a component of Custodiol and Custodiol-N, it contributes to maintaining organ viability and function during the critical period between organ retrieval and implantation. Ongoing research aims to further optimize these solutions, potentially improving outcomes for transplant recipients. Patients awaiting or considering organ transplantation should discuss the latest developments in organ preservation techniques with their healthcare providers to understand how these advancements might impact their treatment.

Study Focus Key Comparisons Main Outcomes Patient Population
Heart transplantation in children Custodiol-N vs Custodiol Safety, myocardial protection, graft survival Children aged 5 to <18 years
Cardiac surgery for congenital heart defects Custodiol-N vs Custodiol Safety, myocardial protection, hemodynamics Children from birth to <18 years
Major cardiac surgery in adults Custodiol vs Buckberg blood cardioplegia Composite of death, perioperative AMI, low cardiac output, kidney failure Adults undergoing major cardiac surgery
Organ transplantation (kidney, liver, pancreas) Custodiol-N vs Custodiol Graft function, organ-specific markers, complications Adult recipients of kidney, liver, or pancreas transplants

FAQ

  • What is L-Histidine Hydrochloride used for in these clinical trials? L-Histidine Hydrochloride is a component of organ preservation and cardioplegia solutions like Custodiol and Custodiol-N. These solutions are used to protect organs during transplantation and heart surgeries by maintaining organ function and reducing damage during periods without blood flow.
  • What types of procedures are being studied in these clinical trials? The clinical trials are studying the use of L-Histidine Hydrochloride-containing solutions in various procedures, including heart transplantation in children, major cardiac surgery in adults, and organ transplantation for kidneys, liver, and pancreas.
  • How do these trials compare different solutions? The trials often compare the performance of Custodiol-N, a newer formulation, to the standard Custodiol solution or other cardioplegia methods. They assess factors such as organ function, patient outcomes, and safety profiles to determine if one solution offers advantages over the others.
  • What are some of the main outcomes being measured in these studies? The studies measure various outcomes depending on the organ involved. For heart surgeries, they look at markers of heart damage, heart function, and overall patient recovery. In organ transplantation, they assess graft function, complications, and long-term organ survival.
  • Who are the participants in these clinical trials? Participants vary by study but include children undergoing heart transplantation, adults having major cardiac surgery, and patients receiving kidney, liver, or pancreas transplants. Some trials also involve organ donors, both living and deceased.

Ongoing Clinical Trials on L-Histidine Hydrochloride

  • Study comparing Custodiol-N and Custodiol organ preservation solutions for heart transplantation in children

    Recruiting

    2 1 1 1
    Investigated diseases:
    Investigated drugs:
    Germany

  • Study on Organ Preservation in Kidney, Liver, and Pancreas Transplants Using Custodiol-N Solution Compared to a Drug Combination for Transplant Patients

    Recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    Austria

  • Study Comparing Custodiol-N and Custodiol for Heart Surgery in Children with Congenital Heart Defects

    Not yet recruiting

    2 1 1 1
    Investigated diseases:
    Investigated drugs:
    Germany

  • Study on the Effects of Custodiol and Buckberg Cardioplegia in Patients Undergoing Major Heart Surgery with Prolonged Aortic Clamping

    Not yet recruiting

    3 1 1 1
    Investigated drugs:
    Spain

Glossary

  • Cardioplegia: A technique used in cardiac surgery to temporarily stop the heart by using a special solution. This allows surgeons to operate on a still, bloodless heart.
  • Custodiol: An organ preservation solution used to protect organs during transplantation and heart surgeries. It contains various components including L-Histidine Hydrochloride.
  • Custodiol-N: A newer formulation of the Custodiol solution, designed to potentially offer improved organ protection during transplantation and cardiac surgeries.
  • L-Histidine Hydrochloride: An amino acid derivative that is a key component in organ preservation solutions. It helps maintain proper pH levels and protects cells during periods without normal blood flow.
  • Graft function: The ability of a transplanted organ to work properly in the recipient's body. Good graft function is crucial for successful organ transplantation.
  • Delayed graft function: A complication in organ transplantation where the transplanted organ does not function immediately, often requiring additional support or treatment.
  • Myocardial protection: Techniques and solutions used to protect the heart muscle during surgery when normal blood flow is interrupted.
  • Aortic clamping: A surgical technique where the aorta is clamped to stop blood flow to the heart, allowing surgeons to operate on a bloodless, still heart.
  • Extracorporeal circulation: A technique used in heart surgery where a machine temporarily takes over the function of the heart and lungs, allowing surgeons to operate on a still heart.
  • Troponin: A protein released into the blood when heart muscle is damaged. Measuring troponin levels helps assess the extent of heart injury during and after cardiac procedures.
  • CK-MB: Creatine Kinase-MB, an enzyme found primarily in heart muscle. Elevated levels in the blood can indicate heart muscle damage.
  • SLEDAI-2K: Systemic Lupus Erythematosus Disease Activity Index 2000, a tool used to measure disease activity in lupus patients.
  • BILAG-2004: British Isles Lupus Assessment Group 2004 index, another tool used to assess disease activity in lupus patients.
  • PGA: Physician's Global Assessment, a measure used by doctors to evaluate overall disease activity or severity.

References

  1. http://clinicaltrials.eu/trial/study-comparing-custodiol-n-and-custodiol-for-heart-transplantation-in-children/
  2. http://clinicaltrials.eu/trial/study-on-the-effects-of-custodiol-and-buckberg-cardioplegia-in-patients-undergoing-major-heart-surgery-with-prolonged-aortic-clamping/
  3. http://clinicaltrials.eu/trial/study-comparing-custodiol-n-and-custodiol-for-heart-surgery-in-children-with-congenital-heart-defects/
  4. http://clinicaltrials.eu/trial/study-on-organ-preservation-in-kidney-liver-and-pancreas-transplants-using-custodiol-n-solution-compared-to-a-drug-combination-for-transplant-patients/