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Calcium

Calcium, an essential mineral for human health, is being studied in various clinical trials for its potential therapeutic benefits. These trials are investigating the use of calcium in different medical conditions, ranging from ovarian hyperstimulation syndrome to trauma-related massive hemorrhage. The research aims to understand how calcium supplementation or infusion can improve patient outcomes in these diverse scenarios.

Table of Contents

What is Calcium?

Calcium is an essential mineral that plays a crucial role in various bodily functions. It is best known for its importance in maintaining strong bones and teeth, but it also plays vital roles in muscle function, nerve signaling, and blood clotting[1]. In medical settings, calcium is often used as a supplement or treatment for various conditions.

Medical Uses of Calcium

Calcium is used in the treatment of several medical conditions:

  • Hypoparathyroidism: This is a condition where the body doesn’t produce enough parathyroid hormone, leading to low calcium levels. Calcium supplements, often combined with vitamin D, are used to manage this condition[1].
  • Osteoporosis: While not directly mentioned in the trials, calcium is crucial for bone health and is often used in the prevention and treatment of osteoporosis.
  • Hypocalcemia: This is a condition of low blood calcium levels, which can occur in various situations including after certain surgeries or in critically ill patients[2].

Different Forms of Calcium

Calcium comes in various forms, each with its own characteristics:

  • Calcium Carbonate: This is the most common and least expensive form of calcium supplement. It contains the highest concentration of elemental calcium (42%) but requires stomach acid for absorption[1].
  • Calcium Citrate: This form is more easily absorbed, especially in people with low stomach acid or those taking medications that reduce stomach acid[1].
  • Calcium Gluconate: This form is often used for intravenous (IV) administration in hospital settings[2].

Calcium in Diabetes Treatment

Recent research is exploring the use of calcium in combination with other medications for treating type 2 diabetes and associated conditions. For example, a combination of empagliflozin (a diabetes medication) and rosuvastatin (a cholesterol-lowering drug) with calcium is being studied for its potential benefits in managing both diabetes and dyslipidemia (abnormal blood fat levels)[3][4].

Calcium in Dental Care

Calcium plays a significant role in dental health. Some dental products contain calcium-based compounds to help reduce tooth sensitivity and promote remineralization of tooth enamel. For example:

  • Calcium Sodium Phosphosilicate: This compound is used in some toothpastes to help relieve tooth sensitivity[5].
  • Calcium Silicate: Used in some dental materials, this compound may help in the healing of dental tissues[6].

Calcium in Cancer Treatment

Calcium is being explored in innovative cancer treatments:

  • Calcium Electroporation: This is a new technique being studied for treating esophageal cancer. It involves injecting calcium into the tumor and then applying electrical pulses to increase calcium uptake by cancer cells, potentially leading to their death[7].
  • Radiolabeled Calcium: In some advanced treatments, calcium compounds are used to deliver radioactive substances to cancer cells[8].

Calcium in Reproductive Health

Calcium is being studied in the context of reproductive health, particularly in the prevention of a condition called Ovarian Hyperstimulation Syndrome (OHSS). This is a potential complication of fertility treatments. Intravenous calcium gluconate is being compared to other treatments for its effectiveness in preventing OHSS[9][10].

Calcium in Trauma Care

In trauma care, especially in cases involving massive blood transfusions, calcium plays a crucial role. When patients receive large amounts of stored blood, their calcium levels can drop dangerously low. This is because the substances used to store blood can bind to calcium in the body. Researchers are studying whether giving calcium to trauma patients receiving massive blood transfusions can improve outcomes[2].

Side Effects and Precautions

While calcium is essential for health, it’s important to use it correctly:

  • High doses of calcium carbonate can cause side effects like flatulence, constipation, and gastrointestinal discomfort[1].
  • People with certain conditions, such as kidney stones, should be cautious about calcium supplementation[1].
  • Intravenous calcium should only be administered under medical supervision, as it can cause serious side effects if not used correctly[2].

Always consult with a healthcare provider before starting any new supplement regimen, including calcium supplements.

Condition Calcium Intervention Key Findings/Objectives
Ovarian Hyperstimulation Syndrome (OHSS) Calcium gluconate infusion Compared with cabergoline for OHSS prevention in high-risk patients undergoing fertility treatments
Massive Hemorrhage in Trauma Calcium gluconate administration during massive transfusion Investigating the impact on transfusion requirements, vasopressor use, and mortality
Post-Thyroidectomy Hypocalcemia Prophylactic calcium gluconate infusion Evaluating effectiveness in reducing hypocalcemia rates after total thyroidectomy
Calcium Absorption Post-Bariatric Surgery Calcium citrate vs. calcium carbonate supplementation Comparing absorption of different calcium formulations in patients with various bariatric surgeries
Esophageal Cancer Calcium electroporation Assessing safety and feasibility of endoscopic-assisted calcium electroporation for tumor treatment

FAQ

  • What is calcium being studied for in clinical trials? Calcium is being studied for various conditions including ovarian hyperstimulation syndrome prevention, management of massive hemorrhage in trauma patients, prevention of hypocalcemia after thyroidectomy, and its absorption in patients who have undergone bariatric surgery.
  • How is calcium administered in these trials? Calcium is administered in different forms depending on the study. It may be given as an intravenous infusion of calcium gluconate, oral calcium citrate or carbonate tablets, or as part of a massive transfusion protocol in trauma cases.
  • What is ovarian hyperstimulation syndrome (OHSS)? OHSS is a potentially serious complication of assisted reproductive technologies. It is characterized by a sudden increase in vascular permeability, leading to fluid accumulation in the body cavities and can cause various symptoms and complications.
  • Why is calcium being studied in trauma patients with massive hemorrhage? Calcium is crucial for blood clotting and maintaining heart and muscle function. In massive hemorrhage, patients can develop hypocalcemia due to blood loss and transfusion of citrate-containing blood products. Calcium supplementation may help improve outcomes in these cases.
  • Are there any potential side effects of calcium administration in these trials? While calcium is generally safe, some studies mention potential side effects such as arrhythmia with calcium infusion. The trials are designed to monitor for any adverse events related to calcium administration.

Ongoing Clinical Trials on Calcium

  • 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 of AZD9550 and AZD6234 combination for weight loss in people with obesity or overweight with health complications

    Not recruiting

    2 1 1
    Investigated diseases:
    Investigated drugs:
    Germany

  • Study on the Effects of Calcium, Tacrolimus, and Mycophenolate Mofetil in Patients with Kidney Transplants

    Not recruiting

    3 1 1 1
    Investigated drugs:
    Norway

  • Study on the Safety and Effects of AZD9550 for Overweight and Obese Patients with Non-Alcoholic Steatohepatitis (NASH) with or without Type 2 Diabetes

    Not recruiting

    1 1 1
    Investigated diseases:
    Investigated drugs:
    Austria Germany Sweden

  • Study on the Effects of Romosozumab and Bisphosphonates in Children and Adolescents with Osteogenesis Imperfecta

    Not recruiting

    3 1 1 1
    Investigated drugs:
    Austria Belgium France Germany Hungary Italy +3

  • Study on Liver Transplantation: Comparing Custodiol-N Solution with a Drug Combination for Organ Preservation in Patients Undergoing Liver Transplant Surgery

    Not recruiting

    3 1 1 1
    Investigated diseases:
    Investigated drugs:
    Spain

Glossary

  • Hypocalcemia: A condition where there is an abnormally low level of calcium in the blood, which can lead to various symptoms and complications.
  • Ovarian Hyperstimulation Syndrome (OHSS): A medical complication that can occur in some women undergoing fertility treatments, characterized by swollen and painful ovaries and potentially serious symptoms.
  • Massive Hemorrhage Protocol (MHP): A standardized approach for rapid blood product administration in patients with severe bleeding, often used in trauma cases.
  • Ionized Calcium (iCa): The biologically active form of calcium in the blood that is measured to assess a person's true calcium status.
  • Cabergoline: A medication that acts as a dopamine receptor agonist, used in some studies to prevent ovarian hyperstimulation syndrome.
  • Bariatric Surgery: Surgical procedures performed on the stomach or intestines to induce weight loss in severely obese individuals.
  • Thyroidectomy: A surgical procedure to remove all or part of the thyroid gland, which can sometimes lead to hypocalcemia as a complication.
  • Intracytoplasmic Sperm Injection (ICSI): A specialized form of in vitro fertilization where a single sperm is injected directly into an egg.
  • Citrate: A substance added to stored blood products to prevent clotting, which can bind calcium and potentially lead to hypocalcemia in massive transfusions.

References

  1. https://clinicaltrials.gov/study/NCT03425747
  2. https://clinicaltrials.gov/study/NCT05953376
  3. https://clinicaltrials.gov/study/NCT04602754
  4. https://clinicaltrials.gov/study/NCT04603508
  5. https://clinicaltrials.gov/study/NCT06273930
  6. https://clinicaltrials.gov/study/NCT06307678
  7. https://clinicaltrials.gov/study/NCT04958044
  8. https://clinicaltrials.gov/study/NCT00019227
  9. https://clinicaltrials.gov/study/NCT02875587
  10. https://clinicaltrials.gov/study/NCT06333691