时间:2024-12-23
Secondary hyperparathyroidism(SHPT),a common complication of end-stage renal disease(ESRD),is characterized by the progressive hyperplasia of parathyroid glands and increased secretion of parathyroid hormones[1,2].After 3-10 and 20 years of hemodialysis,respectively,20% and 40% of patients require parathyroidectomy(PTX)[3].At present,subtotal and total PTX plus autotransplantation are the standard procedures for the treatment of SHPT.In the context of dialysis,SHPT may recur;in this case,total PTX(TPTX)without auto-transplantation is an effective therapeutic option[3].However,postoperative hypocalcemia limits its clinical application[4,5].
Despite monitoring serum calcium levels and adjusting the amounts of supplemented calcium and vitamin D,the incidence of hypocalcemia after TPTX remains high,
72%-97%[6].Hypocalcemia occurs due to the abrupt withdrawal of parathyroid hormones,which results in a sharp increase in bone remineralization(hungry bone syndrome),depleting calcium from the circulation[7-9].The ensuing severe hypocalcemia(SH)is a critical condition that may result in convulsions,arrhythmias,and even sudden death.Therefore,the possible complications of hypocalcemia limit the clinical application of TPTX.Studies have examined the prognostic factors of hypocalcemia after PTX[10-13]but reported conflicting data due to different methods.
Maintaining adequate calcium levels after TPTX is required to avoid hypocalcemia complications and hungry bone syndrome[14].Viaene
[15]showed that high preoperative parathyroid hormone levels and low calcium amounts are predictive of SH after TPTX[15].Previous studies have used alkaline phosphatase(ALP)levels to predict the level of calcium supplementation(CS),with apparent success in improving patient outcomes[16,17].Nevertheless,efficient tools for reducing or preventing SH after TPTX have not been reported.
This study had some limitations.First,this was not a randomized trial,with differences in indications and periods for the two CS regimens.In addition,the study period was relatively short,and the sample size was small.Furthermore,as a single-center study in China,the results may not be suitable for other dialysis patients,as most patients in our center had end-stage disease with severe symptoms and delayed surgical opportunities.Furthermore,postoperative iPTH levels were not assessed in this study,although they are more important than preoperative iPTH amounts,showing an association with SH[31].
At first the King and all the kingdom were terrified. All except the Princess, that is. She trusted her littlest knight and upon hearing the whole story set about immediately to make a healing salve for the dragon s eyes.
Few studies have examined the prognostic factors of hypocalcemia after PTX.As shown above,following univariable analysis,age,preoperative iPTH amounts,ALP levels,serum phosphorus concentration,calcium phosphate product,and preventive CS were significantly associated with SH after surgery;however,only preoperative iPTH levels,preoperative ALP amount,preoperative serum phosphorus levels,and preventive CS independently predicted postoperative SH in multivariable analysis.
The diagnosis of SHPT was based on hypocalcemia or normocalcemia with elevated parathyroid hormone levels in patients with chronic kidney disease,vitamin D deficiency,or inadequate calcium intake or absorption[18,19].Hypocalcemia and SH were defined as total calcium corrected for albumin <2 mmol/L and < 1.875 mmol/L,respectively.
What is all this? said he, when he saw what was going on, and he boxed thePrincess s ears with his slipper14, just as the swineherd was taking theeighty-sixth kiss.
To identify risk factors for SH after TPTX and compare conventional and preventive calcium supplementation(CS)regimens for their effects on SH occurrence after TPTX.
Between January 2015 and May 2016,conventional CS was performed in patients who underwent TPTX.The amounts of supplemented calcium were adjusted according to postoperative serum calcium levels.The CS protocol in our hospital changed after October 2016 due to a significant number of patients developing hypocalcemia after surgery.From October 2016 to May 2018,preventive CS was performed in patients with ESRD complicated by SPTH after TPTX.According to preoperative ALP levels,the patients were defined as low-risk(ALP < 500 U/L)and high-risk(ALP > 500 U/L)for SH.Low-risk cases received supplementation with 50 mL of 10% calcium gluconate daily,and the level of CS was adjusted according to daily serum calcium amounts.In high-risk patients,supplementation with 100 mL of 10% calcium gluconate was performed daily,with the level of CS also adjusted according to daily serum calcium amounts.In both the low- and high-risk groups,CS was started on the day of surgery.
All preoperative blood samples were collected in the fasting state on the day before surgery.Postoperative blood samples were obtained at 6-7 AM from the first postoperative day(within 48 h after TPTX)to monitor daily blood calcium.Postoperative CS was administered at around 8 AM daily.Age,sex,body mass index(BMI),preoperative serum calcium amounts,serum phosphorus levels,calciumphosphorus ratio,ALP amounts,and iPTH levels were recorded.
Statistical analysis was performed with SPSS 21.0(IBM,Armonk,New York,United States).Continuous data are presented as mean ± SD and analyzed using the Student’s
-test.Categorical data are presented as numbers and percentages and analyzed using the chi-square test.Factors with
< 0.10 in univariable analysis were included in multivariable logistic regression analysis to determine risk factors for SH.
<0.05 was considered statistically significant.
And she told him that she was the daughter of the King of that country, and that she was tied there to be eaten by a monstrous beast out of the sea; for the beast came and devoured35 a girl every day
Liu J,Yang M,and Fan XF carried out the studies,collected data,and drafted the manuscript;Liu J and Yang M performed the statistical analysis and critically reviewed the manuscript for important intellectual content;Huang LP and Zhang L participated in the acquisition,analysis,or interpretation of data and drafted the manuscript;and all authors read and approved the final manuscript.
In all patients,the hypocalcemia occurrence rate within 48 h after surgery was 61.3%(166/271),and serum calcium levels were lower than normal(< 2 mmol/L).Postoperative serum calcium levels within 48 h were higher in the preventive CS group compared with the conventional CS group(2.02 ± 0.32
1.81 ± 0.32 mmol/L,
< 0.001).In addition,the postoperative occurrence rates of hypocalcemia(46.0%
74.5%,
< 0.001),SH(31.7%
64.1%,
< 0.001)and critical hypocalcemia(4.0%
14.5%,
= 0.003)were lower in the preventive CS group(Table 2).
Variables with
< 0.1 in univariate analysis(Table 3)were included in multivariate logistic regression analysis to determine the risk factors for SH(Table 4).The results showed that preoperative iPTH levels[odds ratio(OR)= 1.001,95% confidence interval(CI): 1.000-1.001,
= 0.009),preoperative ALP amounts(OR = 1.002,95%CI: 1.001-1.003,
= 0.002),preoperative serum phosphorus levels(OR = 8.729,95%CI: 1.518-50.216,
= 0.015)and the preventive CS regimen(OR = 0.132,95%CI: 0.067-0.261,
<0.001)were independently associated with SH.
In patients with ALP > 500 U/L,the occurrence rate of hypocalcemia within 48 h after surgery was 93.5%(72/77),and serum calcium levels were lower than control values(Table 5).Compared with the conventional CS group,the preventive CS group displayed higher postoperative serum calcium levels within 48 h(1.76 ± 0.22
1.55 ± 0.17 mmol/L,
< 0.001)and lower occurrence rates of postoperative SH(62.9%
90.5%,
= 0.005)and critical hypocalcemia(8.6%
33.3%,
= 0.012).
Logistic regression analysis was performed to determine the risk factors for SH in patients with preoperative ALP levels > 500 U/L(Table 6).As shown in Table 6,only the preventive CS regimen(OR= 0.147,95%CI: 0.038-0.562,
= 0.005)was independently associated with SH.
SH is a dreaded complication of TPTX[14],and tools for its prevention are scarce[15-17].This study aimed to identify risk factors for SH and to compare conventional and preventive CS regimens in terms of SH occurrence after TPTX.The results suggested that preventive CS could reduce the occurrence of SH,indicating its critical value for hypocalcemia after TPTX.
TPTX is an effective method for treating SHPT,but postoperative hypocalcemia occurs in 20%-85% of the treated patients[11,20-22],which limits its clinical application.SH may lead to laryngeal stridor,spasms,arrhythmias,congestive heart failure,and tetany,which could be life-threatening in severe cases.In this study,the occurrence rate of hypocalcemia in patients administered conventional CS was 74.5%(108/145)within 48 h after surgery;in addition,the occurrence rates of SH and critical hypocalcemia were 64.1%(93/145)and 14.5%(21/145),respectively.These findings indicated that SH occurrence after surgery is very high with conventional CS.
Studies have reported the prognostic factors of hypocalcemia after PTX[10-13],but surgical methods were different among these studies,which yielded conflicting findings.In addition,the effect of age on postoperative serum calcium amounts remains controversial[10-13].Furthermore,studies reported that older patients with SHPT are more likely to develop postoperative hypocalcemia[23,24].The reasonmight be that such patients are prone to vitamin D deficiency and inadequate nutrition intake[23,25,26].Other studies suggested that younger age is a risk factor for postoperative hypocalcemia[11,14,20,24].Few reports considered the male gender as a risk factor for hypocalcemia after TPTX[11].Investigations revealed preoperative PTH levels to be an independent risk factor for SH;under excessive PTH stimulation,despite a significant negative balance,bone formation and bone resorption are increased[11,15].Postoperatively,due to the rapid decline in PTH levels,reduced bone resorption and increased bone formation also occur rapidly,and hypocalcemia occurrence is consistent with such changes.ALP encompasses a group of isoenzymes that are mainly present in the liver and bones.High serum levels of ALP are characteristic of bone disease with enhanced osteogenic activity.In SHPT patients,both osteogenic and bone resorption activities are significantly increased[23,27].After PTX,osteoclast activity is significantly reduced,while osteoblast activity remains unchanged for a short time after surgery[28,29].The relative balance of bone metabolism is thus altered,inducing hypocalcemia.Therefore,high preoperative ALP levels may be an independent risk factor for SH after PTX[11,30].Nevertheless,these findings remain controversial in different reports[11,13].
This work was carried out in accordance with the Declaration of Helsinki(2000)by the World Medical Association.The current retrospective study was approved by the institutional review board of China-Japan Friendship Hospital(2019-SDZL-12).The requirement for written informed consent was waived due to the retrospective nature of this study.The records of patients who underwent TPTX between January 2015 and May 2018 were reviewed.The inclusion criteria were:(1)Age > 18 years;(2)ESRD complicated with SHPT;and(3)TPTX administration.The exclusion criteria were:(1)Severe complications before surgery;or(2)Incomplete medical records.
In this study,after preventive CS,the occurrence rates of postoperative hypocalcemia,SH,and critical hypocalcemia were all significantly decreased.The occurrence of SH was reduced from 64.1% to 31.7%,and that of critical hypocalcemia from 14.5% to 4.0%,with no life-threatening hypocalcemia.Based on the present findings,selective enforcement of preventive CS in patients with ALP ≥ 500 could significantly reduce the occurrence rates of SH and critical hypocalcemia,easing the control of hypocalcemia after TPTX as a simple and feasible tool.In high-risk patients with ALP ≥ 500 U/L,the incidence rates of postoperative hypocalcemia were 97.6% and 88.6% in the conventional and preventive CS groups,respectively,indicating a slight but not statistically significant decrease.Nevertheless,the occurrence rates of SH and critical hypocalcemia were significantly decreased by the preventive CS regimen,from 90.5% and 33.3% to 62.9% and 8.6%,respectively.Although selective enforcement of preventive CS significantly improved the calcium status of patients at high risk of hypocalcemia,the incidence of life-threatening critical hypocalcemia remained as high as 8.6%,and further investigation is warranted to develop tools to reduce this rate.In addition,applying CS or selecting subtotal PTX or TPTX combined with auto-transplantation should be studied.However,although TPTX with autotransplantation is a more rational therapy than TPTX,some patients decline auto-transplantation mostly because of high cost.Therefore,tools should be developed to prevent hypocalcemia in such individuals.
The King desired him to dive after it, adding, If you return without it you will be thrown back into the lake time after time, till you are drowned in its depths
Every Sunday Jurgen went to church; and when his eyes rested onthe picture of the Virgin Mary over the altar as he sat there, theyoften glided away to the spot where they had knelt side by side
Then he saw just in front of him the great doorway of a cathedral; the lights were gleaming in the dark aisles, and the fragrance of incense was wafted towards him
Therefore,this study aimed to identify risk factors for SH and compare conventional and preventive CS regimens for their effects on SH occurrence after TPTX.We found that preventive CS reduces the occurrence of SH,indicating its critical value for hypocalcemia after TPTX.
In conclusion,these findings suggest that preventive CS significantly reduces the occurrence rates of SH and critical hypocalcemia after TPTX for SHPT.ARTlCLE HlGHLlGHTS
Total parathyroidectomy(TPTX)without auto-transplantation is an effective therapeutic option for treating secondary hyperparathyroidism.However,postoperative hypocalcemia limits its clinical application.
Identify risk factors for severe hypocalcemia(SH)after TPTX,and find efficient tools for reducing or preventing SH.
Browny was quite delighted with his soft mud walls and with the clay floor, which soon looked like nothing but a big mud pie. But that was what Browny enjoyed, and he was as happy as possible, rolling about all day and making himself in such a mess. One day, as he was lying half asleep in the mud, he heard a soft knock at his door, and a gentle voice said:
Indications for TPTX in patients with ESRD complicated with SHPT were:(1)Intact parathyroid hormone(iPTH)amounts exceeding 800 pg/mL before surgery;(2)Uncontrollable hypercalcemia with hyperphosphatemia or refractory PTH accompanied by clinical symptoms such as bone pain and itchiness;(3)Previous resistance to active vitamin D;and(4)Doppler ultrasound showing more than one parathyroid gland enlarged by over 1 cm,and abundant blood flow[10].Surgeries were performed by surgeons with > 10 years of experience.Under general anesthesia,the back of the cervical thyroid was explored to identify all four parathyroid glands,which were completely removed.The thymus was not routinely explored or removed.If less than four parathyroid glands were found,the thymus was explored,and the suspected parathyroid glands were removed.
From January 2015 to May 2016,conventional CS was performed in patients who underwent TPTX,with calcium amounts adjusted according to postoperative serum calcium levels.From October 2016 to May 2018,preventive CS was performed according to preoperative alkaline phosphatase(ALP)levels.Continuous data are presented as mean ± SD and analyzed by the Student’s
-test.Categorical data are presented as numbers and percentages and analyzed using the chi-square test.Factors with
< 0.10 in univariable analysis were included in multivariable logistic regression analysis to determine the risk factors for SH.
A total of 271 patients were included.Compared with conventional CS,preventive CS led to lower occurrence rates of hypocalcemia within 48 h(46.0%
74.5%,
< 0.001)and SH(31.7%
64.1%,
<0.001).Multivariable analysis showed that preoperative iPTH levels[odds ratio(OR)= 1.001,95%confidence interval(CI): 1.000-1.001,
= 0.009),preoperative ALP amounts(OR = 1.002,95%CI: 1.001-1.003,
= 0.002),preoperative serum phosphorus levels(OR = 8.729,95%CI: 1.518-50.216,
= 0.015)and preventive CS(OR = 0.132,95%CI: 0.067-0.261,
< 0.001)were independently associated with SH.In patients with preoperative ALP ≥ 500 U/L,only preventive CS(OR = 0.147,95%CI: 0.038-0.562
=0.005)was independently associated with SH.
Preventive CS is an efficient tool for reducing the occurrence of SH after TPTX.
As she was raving15 and roaring in this frantic16 manner part of the floor suddenly opened and a huge giant rose up carrying a great chest in his arms
Preventive CS could reduce the occurrence of SH after TPTX,which might contribute to the clinical application of TPTX.
The authors acknowledge the help of all their coworkers who contributed to this project.
Michener believed a writer must know the country and experience an event to be able to write about it. I thought this was the right path to take, so I visited Spain, Australia (twice), Japan, China and other countries which, along with my library research, resulted in my publishing many hardbound books.
A total of 271 patients administered TPTX with confirmed SHPT were included in this study.These patients were 47.7 ± 11.1 years old,and 57.6% were male.Their mean BMI was 22.9 ± 3.8 kg/m
.There were no significant differences in sex,age,BMI,preoperative ALP,serum calcium,serum phosphorus,calcium-phosphorus ratio,and iPTH between the two CS groups(Table 1).
the Subject of Beijing Science and Technology Plan,No.Z191100006619014.
This work was carried out in accordance with the Declaration of Helsinki(2000)by the World Medical Association.The current retrospective study was approved by the institutional review board of China-Japan Friendship Hospital(2019-SDZL-12).
Patients were not required to give informed consent to the study because the analysis used anonymous clinical data that were obtained after each patient agreed to treatment by written consent.
We have no financial relationships to disclose.
No additional data are available.
This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers.It is distributed in accordance with the Creative Commons Attribution NonCommercial(CC BYNC 4.0)license,which permits others to distribute,remix,adapt,build upon this work non-commercially,and license their derivative works on different terms,provided the original work is properly cited and the use is noncommercial.See: https://creativecommons.org/Licenses/by-nc/4.0/
China
Jun Liu 0000-0001-6651-1899;Xue-Feng Fan 0000-0003-0513-8327;Meng Yang 0000-0001-7514-4015;Lin-Ping Huang 0000-0003-1957-7478;Ling Zhang 0000-0002-9415-8890.
Quick, away with him, and off with his head! So the false slave was put to death, that none might follow in his footsteps, and the wedding feast was held, and the hearts of all rejoiced that the true bridegroom had come at last
Wang JJ
Webster JR
Wang JJ
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