Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (3): 573-579. doi: 10.19723/j.issn.1671-167X.2021.03.022

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Normocalcemic with elevated post-operative parathormone in primary hyperpara-thyroidism: 9 case reports and literature review

XIE Ling-ding,WANG Na,ZHANG Jin-ping,WANG Xin,CHEN Xiao-ping,ZHANG Bo,BU ShiΔ()   

  1. Department of Endocrinology, China-Japanese Friendship Hospital, Beijing 100029, China
  • Received:2020-07-20 Online:2021-06-18 Published:2021-06-16
  • Contact: Shi BU E-mail:13366901921@163.com

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Abstract:

Objective: To summarize and analyze the clinical characteristics of primary hyperpara-thyroidism (PHPT) with normocalcemic parathormone elevation (NPE) after surgical treatment, so as to improve the therapeutic ability and standardized post-operative follow-up of PHPT patients. Methods: Nine patients who were diagnosed with PHPT in the Department of Endocrinology of China-Japan Friendship Hospital from August 2017 to November 2019 were selected as the subjects. They all developed NPE within 6 months after surgical treatment. The clinical features and outcomes were collected and analyzed retrospectively, in addition, the related literature was reviewed. Results: Clinical features: among the 9 patients, 6 were middle-aged and elderly females and 3 were male. The main clinical manifestations were bone pain, kidney stones, nausea and fatigue except for one case of asymptomatic PHPT. Pre-operative examination showed high serum calcium [(3.33±0.48) mmol/L], low serum phosphorus [0.76 (0.74,0.78) mmol/L], high 24-hour urinary calcium [8.1(7.8,12.0) mmol/24 h], obviously elevated intact PTH [(546.1±257.7) ng/L], vitamin D deficiency [25-hydroxyvitamin D3 (21.0±5.7) nmol/L]. Serum levels of bone alkaline phosphatase [7 patients 41.3(38.6,68.4) μg/L,2 patients >90 μg/L] and N-terminal midcourse osteocalcin (>71.4 μg/L) were significantly elevated. The estimated glomerular filtration rate decreased in 2 patients. Imaging examination: 7 patients had osteoporosis. Renal calculi were found in 3 patients by renal ultrasound. Imaging examination of parathyroid glands found definite lesions in all the patients, including 2 cases of multiple lesions and 7 cases of single lesions. Treatment and outcome: two patients underwent parathyroidectomy, while other patients were treated with microwave thermal ablation. PTH increased 1 month after therapy [(255.0±101.4) ng/L], and no recurrent lesions were found by parathyroid ultrasound. After combined treatment with cal-cium and vitamin D for six months, PTH decreased significantly and the level of serum calcium remained normal at anytime during the follow-up period. Conclusion: The occurrence of postoperative NPE may be related to the higher pre-operative PTH, vitamin D deficiency and lower creatinine clearance. However, NPE may not predict recurrent hyperthyroidism or incomplete parathyroidectomy. Adequate calcium and vitamin D supplementation after surgery seems to be beneficial for patients with NPE. Post-operative follow-up of PHPT patients should be standardized to prevent and treat post-operative NPE.

Key words: Primary hyperparathyroidism, Parathyroid hormone, Vitamin D

CLC Number: 

  • R582.1

Table 1

Clinical characteristics and laboratory examinations of nine patients with PHPT before operation"

Item Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8 Case 9 Reference (range)
Gender Female Female Female Female Male Female Male Female Male
Age/years 54 55 76 56 55 54 59 58 31
Body mass index/(kg/m2) 18.8 37.1 28.5 22.3 24.5 26.4 25.4 23.8 21.3
Ostealgia Yes No No Yes Yes Yes Yes No Yes
Fatigue Yes No Yes Yes Yes Yes Yes No Yes
Nausea Yes No Yes Yes Yes Yes Yes No Yes
Fracture No No No No No No No No No
Kidney stone Yes No No Yes Yes No No Yes Yes
25OHD3/(nmol/L) 27.4 17.8 19.5 31.3 11.5 20.3 22.4 19.8 19.0 Lack<25,
insufficient
25-74,
enough 75-250
Ca/(mmol/L) 3.51 2.96 2.80 3.06 3.43 3.32 3.41 3.09 4.46 2.00-2.75
P/(mmol/L) 0.75 0.74 0.54 0.93 0.76 0.74 0.78 0.78 0.76 0.81-1.78
ALP/(U/L) 295 109 176 112 207 189 207 168 721 40-150
iPTH/(ng/L) 589.4 255.5 571.8 358.6 669.2 522.5 485.6 330.4 1 131.8 12-88
24 h UCa/(mmol/24 h) 14.9 8.1 7.8 7.6 8.0 8.6 9.1 7.7 31 2.7-7.5
Bone-derived alkaline phosphatase/(μg/L) >90 41.3 40.5 38.6 79.4 60.5 68.4 38.2 >90 8.5-17.9
N-MID OC/(μg/L) >71.4 >71.4 >71.4 >71.4 >71.4 >71.4 >71.4 >71.4 >71.4 11.7-55.2
TRACP/(U/L) 6.56 3.01 3.97 4.10 2.56 4.23 4.35 3.42 6.42 2.05-4.53
β-CTX/(μg/L) 1.25 1.07 0.80 0.90 0.28 0.82 0.94 0.56 8.56 0.128-1.292
eGFR [mL/(min·1.73m2)] 81.6 111.3 44.4 100.4 111.4 90.3 92.4 88.6 56.4 80-120
Albumin/(g/L) 40.0 41.2 39.6 47.6 42.7 41.5 40.6 40.8 38.5 35.0-55.0
Bone mineral density
TL2-4 -3.9 -2.7 -2.6 -2.9 -0.8 -2.7 -2.9 -2.1 -0.1(Z)
Tfemoral neck -3.7 -2.6 -1.7 -2.6 -1.8 -2.8 -2.4 -2.0 -3.4(Z)
Ttotal hip -3.5 -2.4 -1.5 -2.7 -1.8 -2.6 -2.5 -2.1 -3.0(Z)
Parathyroid ultrasonography Single
lesion:
2.8 cm×
2.7 cm
Lesion 1:
1.1 cm×
0.6 cm;
Lesion 2:
1.1 cm×
0.8 cm
Single
lesion:
2.1 cm×
1.2 cm
Single
lesion:
2.0 cm×
0.5 cm
Lesion 1:
1.3 cm×
0.8 cm;
Lesion 2:
1.5 cm×
0.8 cm;
Lesion 3:
1.8 cm×
1.2 cm
Single
Lesion:
2.4 cm×
2.5 cm
Single
lesion:
2.8 cm×
1.5 cm
Single
lesion:
2.1 cm×
0.9 cm
Single
lesion:
2.6 cm×
2.1 cm
Technetium-99m sestamibi and
computed tomography
Single
lesion
Two
lesions
Single
lesion
Single
lesion
Three
lesions
Single
lesion
Single
lesion
Single
lesion
Single
lesion

Figure 1

Changes of serum intact parathyroid hormone, calcium and 25-hydroxyvitamin D3 level before and after operation A, changes of serum calcium level before and after operation; B, changes of serum iPTH level before and after operation; C, changes of serum 25-OHD3 level before and after operation. iPTH, intact parathyroid hormone; 25-OHD3, 25-hydroxyvitamin D3."

Table 2

Post-operative treatment of the nine patients"

Items Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8 Case 9
Post-operative 1-month therapy Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
1.5 g, 2/d
Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
1.5 g, 2/d; VitD3 800
IU, 1/d
Rocaltrol
0.25 μg,
2/d
Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
0.75 g, 2/d
Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
0.75 g, 2/d
Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
0.75 g, 1/d
Rocaltrol
0.25 μg, 2/d; Calcium
carbonate
0.75 g, 1/d
Rocaltrol
0.25 μg, 1/d; Calcium
carbonate
0.75 g, 2/d
Rocaltrol
0.25 μg, 3/d; Calcium
carbonate
0.75 g, 3/d; VitD3 2 000
IU, 1/d
Post-operative 3-month therapy Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg,2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 1.5 g,
2/d;
Rocaltrol
0.25 μg,3/d;VitD3
2 000 IU,1/d
Post-operative 6-month therapy Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg,2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate 750
mg, 2/d;
Rocaltrol
0.25 μg, 2/d; VitD3
2 000 IU,1/d
Calcium carbonate
1.5 g, 2/d;
Rocaltrol
0.25 μg, 3/d; VitD3
2 000 IU,1/d
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