Administration Of Calcium Gluconate for The Reduction of Blood Loss During Elective Cesarean Delivery

Обзор

Postpartum hemorrhage (PPH) is the leading cause of death related to pregnancy. PPH can lead to blood transfusion, disseminated intravascular coagulation (DIC), hysterectomy, or death. The prophylactic administration of uterotonic agents as part of an active management of the third stage of labor has been proven to reduce rates of PPH. However, even with these treatments, PPH rate is still relatively high, and puts women at risk of heavy bleeding and death. Calcium is a key component in the coagulation cascade and known as factor IV. It has a role in platelet activation, and it is an important co-factor for the activation of factors II and There is a concentration-dependent effect of hypocalcemia on in vitro clot strength in patients at risk of bleeding. Calcium gluconate is the calcium salt of gluconic acid, and it has a relatively strong safety profile. Hypocalcemia is a poor prognostic factor in actively bleeding patients. Calcium has a positive inotropic effect both on skeletal muscle and smooth muscle. The inotropic effect doesn't skip the myometrium, and it is well-established that hypocalcemia can impair myometrial contractility. As so, calcium channel blockers are prescribed as a tocolytic drug and calcium gluconate should be considered as adjuvant therapy for treating PPH duo to atony, in case of prolonged tocolytic or magnesium sulfate use prior to delivery. Studies have already shown an association between low ionized calcium levels and the risk for severe bleeding. In a pilot randomized controlled trial of patients with risk factors for uterine atony, calcium was shown to reduce uterine atony compared to placebo. However, current studies have small sample size and are limited to a high-risk population. There are no recommendations in current guidelines for monitoring calcium levels or prescribing calcium as a prophylactic measure for the third stage of labor, despite atony and coagulopathy being significant causes of PPH. HYPOTHESIS: Administration of Calcium Gluconate at the third stage of elective Cesarean delivery will decrease the rates of blood loss during and after the surgery by reducing the rates of uterine atony and development of coagulopathy, thus has the potential of reducing the incidence of PPH and its complications without severe side effects.

Подробное описание

After signing a consent form prior to the surgery (at the pre-operative assessment), At the third stage of labor, women who gave their consent to participate in the study will get either 10 ml of Calcium Gluconate 10% solution (containing 0.94 gr of calcium gluconate) diluted in 100 ml of normal saline IV or 110 ml of normal saline IV.

The solutions will be given in addition to Carbetocin (a long acting oxytocin analogue), in both arms. The invastigators will use calcium gluconate during even-numbered months and normal saline during odd-numbered months, or vice versa, according to randomization that will be known to the primary researcher alone.

A blood sample will be drawn at the beginning of the surgery and sent for blood gas analysis, determining ionized calcium levels and coagulation profile. Women with hypocalcemia or hypercalcemia will be excluded from the trial. Only patients with normal calcium levels between 1.0-1.3 mmol/L will be included in this trial.

An ECG strip will be done prior to the surgery, making sure that the patient doesn't suffer from a QT segment abnormality. All patients will be monitored with a 3 lead- ECG prior, during, and 2 hours following calcium administration. Patients with QT interval abnormalities will be excluded from the trial. After the surgery, a blood sample will be drawn and sent to blood gas analysis (determining ionized calcium levels) and for coagulation profile. A complete blood count will be routinely taken for all women the next day. The hemoglobin level will be compared to the hemoglobin level prior to CD.

Decreased mean hemoglobin drop is the primary outcome. the secondary outcomes are described below.

After the primary analysis we will perform a subgroup analysis, determine whether women with high risk for PPH (such as overdistended uterus, abnormal placentation, myomatous uterus, grand multiparty, coagulation disorder, etc.) may benefit from the intervention more than the general population of all participants.

Вмешательства

• Препарат Calcium Gluconate 10%
  Administration of Calcium Gluconate 10% IV following umbilical cord clamping
• Препарат sodium chloride 0.9%
  Administration of sodium chloride 0.9% IV following umbilical cord clamping

Первичные конечные точки

• Change in mean hemoglobin drop [Срок оценки: 24 hours after the surgery]

Вторичные конечные точки (9)

• The rate of women with a decrease of hemoglobin levels of 2 gr/dl or more [Срок оценки: 24 hours after the surgery]
• additional therapy for the management of PPH [Срок оценки: during hospitalization, an average of 4 days]
• Receipt of blood products. [Срок оценки: during hospitalization, an average of 4 days]
• treatment with intravenous ferrous (iron). [Срок оценки: during hospitalization, an average of 4 days]
• estimated blood loss during the surgery. [Срок оценки: during the surgery]
• Hospitalization length of stay. [Срок оценки: an average of 4 days]
• Duration of cesarean delivery [Срок оценки: during the surgery]
• A composite of adverse maternal outcomes [Срок оценки: during hospitalization, an average of 4 days]
• Endometritis or antibiotic treatment following CD. [Срок оценки: during hospitalization, an average of 4 days]

Критерии участия

Критерии включения

\- Elective Cesarean Delivery, at Gestational age of 35 weeks or more.

Критерии исключения

• Age younger than 18 years old.
• Patients treated with calcium channel blockers.
• Chronic renal failure and hyperphosphatemia.
• Sarcoidosis.
• Hypocalcemia (ionized Ca<1 mmol/L) or hypercalcemia (ionized Ca> 1.3 mmol/L) before the surgery.
• Any QT abnormalities as evident by ECG before Calcium Gluconate administrations or any known conduction abnormality.

Критерии приведены из реестра в оригинале (на английском). Окончательную оценку соответствия проводит исследовательский центр.

Здоровые добровольцы: Да

Дизайн исследования

Распределение

Рандомизированное

Модель

Параллельные группы

Маскирование

Двойное слепое

Основная цель

Профилактика

Центры проведения

Израиль · 4 центра

• Soroka Medical Center — Beersheba
• Shamir Medical Center — Be’er Ya‘aqov
• Rambam Medical Center — Haifa
• Edith Wolfson Medical Center — Holon

Публикации

• Deneux-Tharaux C, Bonnet MP, Tort J. [Epidemiology of post-partum haemorrhage]. J Gynecol Obstet Biol Reprod (Paris). 2014 Dec;43(10):936-50. doi: 10.1016/j.jgyn.2014.09.023. Epub 2014 Nov 6. French. PMID 25447386
• Palta S, Saroa R, Palta A. Overview of the coagulation system. Indian J Anaesth. 2014 Sep;58(5):515-23. doi: 10.4103/0019-5049.144643. PMID 25535411
• Ho KM, Yip CB. Concentration-dependent effect of hypocalcaemia on in vitro clot strength in patients at risk of bleeding: a retrospective cohort study. Transfus Med. 2016 Feb;26(1):57-62. doi: 10.1111/tme.12272. Epub 2016 Jan 5. PMID 26729371
• Papandreou L, Chasiotis G, Seferiadis K, Thanasoulias NC, Dousias V, Tsanadis G, Stefos T. Calcium levels during the initiation of labor. Eur J Obstet Gynecol Reprod Biol. 2004 Jul 15;115(1):17-22. doi: 10.1016/j.ejogrb.2003.11.032. PMID 15223159
• Korytny A, Klein A, Marcusohn E, Freund Y, Neuberger A, Raz A, Miller A, Epstein D. Hypocalcemia is associated with adverse clinical course in patients with upper gastrointestinal bleeding. Intern Emerg Med. 2021 Oct;16(7):1813-1822. doi: 10.1007/s11739-021-02671-6. Epub 2021 Mar 2. PMID 33651325
• Epstein D, Freund Y, Marcusohn E, Diab T, Klein E, Raz A, Neuberger A, Miller A. Association Between Ionized Calcium Level and Neurological Outcome in Endovascularly Treated Patients with Spontaneous Subarachnoid Hemorrhage: A Retrospective Cohort Study. Neurocrit Care. 2021 Dec;35(3):723-737. doi: 10.1007/s12028-021-01214-3. Epub 2021 Apr 7. PMID 33829378
• Kawarabayashi T, Kishikawa T, Sugimori H. Effects of external calcium, magnesium, and temperature on spontaneous contractions of pregnant human myometrium. Biol Reprod. 1989 May;40(5):942-8. doi: 10.1095/biolreprod40.5.942. PMID 2765618
• Epstein D, Solomon N, Korytny A, Marcusohn E, Freund Y, Avrahami R, Neuberger A, Raz A, Miller A. Association between ionised calcium and severity of postpartum haemorrhage: a retrospective cohort study. Br J Anaesth. 2021 May;126(5):1022-1028. doi: 10.1016/j.bja.2020.11.020. Epub 2020 Dec 17. PMID 33341222

Идентификаторы

NCT: NCT06235749 · RMB-0605-22

Первоисточники (государственные реестры)

• ClinicalTrials.gov (NIH, США)

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