Abstract:Hypocalcemic toxicity, because of return of citrate anion to the donor, is the major toxicity of apheresis platelet donation. Oral calcium carbonate, given prophylactically at the start of donation, has shown limited ability to alleviate this toxicity. We examined whether repeated prophylactic doses of calcium carbonate, or of a liquid preparation containing calcium citrate, calcium phosphate, and vitamin D 3 , would be more effective at preventing symptoms of hypocalcemic toxicity. Symptoms were reported by 4… Show more
“…The 5% fall in [Ca 2+ ] observed in method B procedures are less than would typically be expected to result in symptoms of hypocalcemic toxicity . In fact, only 2 of the 47 TPE procedures were accompanied by symptoms, both employing method B.…”
Section: Resultsmentioning
confidence: 89%
“…Method B: Calcium gluconate was compounded by our hospital pharmacy as 2 g of calcium gluconate in 50 mL of 0.9% NaCl to be infused at 25 mL/h during TPE through a three‐way stopcock (Hi‐Flo, Smiths Medical ASD, Dublin, Ohio) placed at the distal end of the return line where it meets the patient's venous access device. Apheresis nurses were permitted to adjust the infusion rate as needed to ameliorate symptoms of ionized hypocalcemia . All TPE were performed using a Spectra Optia Apheresis System (Terumo BCT, Lakewood, Colorado) running version 11 software.…”
Section: Methodsmentioning
confidence: 99%
“…Apheresis nurses were permitted to adjust the infusion rate as needed to ameliorate symptoms of ionized hypocalcemia. 3,14 All TPE were performed using a Spectra Optia Apheresis System (Terumo BCT, Lakewood, Colorado) running version 11 software. Whole blood flow rate was 80 to 100 mL/min.…”
Section: Methodsmentioning
confidence: 99%
“…The 5% fall in [Ca 2+ ] observed in method B procedures are less than would typically be expected to result in symptoms of hypocalcemic toxicity. 2,9,14 In fact, only 2 of the 47 TPE procedures were accompanied by symptoms, both employing method B. In one procedure involving a 36-year-old, 71 kg man, the calcium gluconate infusion pump was inadvertently left off for the first 25 minutes.…”
We compared two methods of calcium gluconate infusion to maintain plasma ionized calcium ([Ca ]) during therapeutic plasma exchange (TPE) performed using the Spectra Optia Apheresis System. Method A, our legacy method, consisted of adding 5 mL of 10% calcium gluconate to each 500 mL bottle of 5% albumin replacement fluid. Method B used an accessory IV infusion of calcium gluconate (2 g in 50 mL of 0.9% NaCl starting at 25 mL/h). Plasma [Ca ] was measured at 20-minute intervals, and symptoms of hypocalcemia were recorded during TPE. Baseline [Ca ] was the same (P = 0.616), as was total acid citrate dextrose Formula A used (P = 0.865), with either method. TPE with method A used 2.62 ± 0.52 g of calcium gluconate vs 1.13 ± 0.27 g with method B (P < 0.001). [Ca2+] remained stable with method A (P = 0.251), but fell on average by 5% with method B (P < 0.05). Hypocalcemic symptoms were reported in 0 of 23 TPE with method A and 2 of 24 TPE with method B. We conclude that both methods A and B prevent a symptomatic fall in plasma [Ca ] during TPE. Method B requires significantly less calcium gluconate than does method A.
“…The 5% fall in [Ca 2+ ] observed in method B procedures are less than would typically be expected to result in symptoms of hypocalcemic toxicity . In fact, only 2 of the 47 TPE procedures were accompanied by symptoms, both employing method B.…”
Section: Resultsmentioning
confidence: 89%
“…Method B: Calcium gluconate was compounded by our hospital pharmacy as 2 g of calcium gluconate in 50 mL of 0.9% NaCl to be infused at 25 mL/h during TPE through a three‐way stopcock (Hi‐Flo, Smiths Medical ASD, Dublin, Ohio) placed at the distal end of the return line where it meets the patient's venous access device. Apheresis nurses were permitted to adjust the infusion rate as needed to ameliorate symptoms of ionized hypocalcemia . All TPE were performed using a Spectra Optia Apheresis System (Terumo BCT, Lakewood, Colorado) running version 11 software.…”
Section: Methodsmentioning
confidence: 99%
“…Apheresis nurses were permitted to adjust the infusion rate as needed to ameliorate symptoms of ionized hypocalcemia. 3,14 All TPE were performed using a Spectra Optia Apheresis System (Terumo BCT, Lakewood, Colorado) running version 11 software. Whole blood flow rate was 80 to 100 mL/min.…”
Section: Methodsmentioning
confidence: 99%
“…The 5% fall in [Ca 2+ ] observed in method B procedures are less than would typically be expected to result in symptoms of hypocalcemic toxicity. 2,9,14 In fact, only 2 of the 47 TPE procedures were accompanied by symptoms, both employing method B. In one procedure involving a 36-year-old, 71 kg man, the calcium gluconate infusion pump was inadvertently left off for the first 25 minutes.…”
We compared two methods of calcium gluconate infusion to maintain plasma ionized calcium ([Ca ]) during therapeutic plasma exchange (TPE) performed using the Spectra Optia Apheresis System. Method A, our legacy method, consisted of adding 5 mL of 10% calcium gluconate to each 500 mL bottle of 5% albumin replacement fluid. Method B used an accessory IV infusion of calcium gluconate (2 g in 50 mL of 0.9% NaCl starting at 25 mL/h). Plasma [Ca ] was measured at 20-minute intervals, and symptoms of hypocalcemia were recorded during TPE. Baseline [Ca ] was the same (P = 0.616), as was total acid citrate dextrose Formula A used (P = 0.865), with either method. TPE with method A used 2.62 ± 0.52 g of calcium gluconate vs 1.13 ± 0.27 g with method B (P < 0.001). [Ca2+] remained stable with method A (P = 0.251), but fell on average by 5% with method B (P < 0.05). Hypocalcemic symptoms were reported in 0 of 23 TPE with method A and 2 of 24 TPE with method B. We conclude that both methods A and B prevent a symptomatic fall in plasma [Ca ] during TPE. Method B requires significantly less calcium gluconate than does method A.
“…Once symptoms resolve, the procedure is usually restarted at a slower inlet rate, while maintaining the increased calcium supplementation rate. 12,15,16 Alternatively, some facilities prefer to prevent citrate toxicity with oral calcium carbonate preprocedure and treat any symptoms as they arise. 4 This strategy proved quite effective in a randomized, double-blind, placebo controlled trial for increasing both total and ionized calcium levels following plateletpheresis.…”
Purpose
During a national shortage of calcium gluconate, we switched to calcium chloride for routine supplementation for peripheral blood stem cell (PBSC) collections. Subsequently, we analyzed the postprocedure ionized calcium level, as we aimed for an equivalent result compared to before the shortage.
Methods
Pharmacy representatives helped us to find an “equivalent” substitute for calcium gluconate at 46.5 mEq in 500 mL normal saline, infused at 100 mL/hour. After instituting a presumably comparable protocol using calcium chloride (40.8 mEq in 250 mL normal saline at a rate of 100 mL/hour), we reviewed ionized calcium results post‐PBSC procedures to compare with those obtained with calcium gluconate. Having noticed a difference in the mean values, we adjusted the rate of calcium chloride to reach our desired outcome.
Results
Twenty‐seven procedures were analyzed on 15 unique patients. We used the Spectra OPTIA with a whole blood: anticoagulant ratio of 13:1. Ionized calcium levels post‐PBSC collection with the first calcium chloride protocol were significantly higher (P = 0.003) in nine patients treated. Subsequently, we decreased the calcium chloride infusion rate to 75 mL/hour and achieved similar mean levels to calcium gluconate (P = 0.382).
Conclusion
Changes in replacement fluids for apheresis procedures can be complex, particularly when dealing with electrolytes that could be clinically significant at critically high or low levels. Once we recognized the need to take into account the amount of elemental calcium infused, we achieved the desired postprocedure ionized calcium results. This study can serve as a lesson for future shortages of infusions used during apheresis procedures.
Citrus juice may lower [Ca ] for 2-3 hours. This could add to the effect of IV citrate infusion during platelet donation, thus worsening the expected fall in [Ca ]. This, in turn, would likely increase the rate and severity of hypocalcemic toxicity. It is prudent to advise platelet donors to avoid high citrate anion beverages, such as citrus juice, for at least 4 hours prior to donation.
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