Primary hyperparathyroidism

Primary hyperparathyroidism (or PHPT) is a medical condition where the parathyroid gland (or a benign tumor within it) produce excess amounts of parathyroid hormone (PTH). The symptoms of the condition relate to the resulting elevated serum calcium (hypercalcemia), which can cause digestive symptoms, kidney stones, psychiatric abnormalities, and bone disease.

Primary hyperparathyroidism
Thyroid and parathyroid.
SpecialtyEndocrinology

The diagnosis is initially made on blood tests; an elevated level of calcium together with a raised (or inappropriately high) level of parathyroid hormone are typically found. To identify the source of the excessive hormone secretion, medical imaging may be performed. Parathyroidectomy, the surgical removal of one or more parathyroid glands, may be required to control symptoms.

Signs and symptoms

The signs and symptoms of primary hyperparathyroidism are those of hypercalcemia. They are classically summarized by "stones, bones, abdominal groans, thrones and psychiatric overtones".

Left ventricular hypertrophy may also be seen.[2]

Other signs include proximal muscle weakness, itching, and band keratopathy of the eyes.

When subjected to formal research, symptoms of depression, pain, and gastric dysfunction seem to correlate with mild cases of hypercalcemia.[3]

Causes

The most common cause of primary hyperparathyroidism is a sporadic, single parathyroid adenoma[4] resulting from a clonal mutation (~97%). Less common are parathyroid hyperplasia[5] (~2.5%), parathyroid carcinoma (malignant tumor), and adenomas in more than one gland (together ~0.5%).Primary hyperparathyroidism is also a feature of several familial endocrine disorders: Multiple endocrine neoplasia type 1 and type 2A (MEN type 1 and MEN type 2A), and familial hyperparathyroidism.

Genetic associations include:

OMIM Name Gene
145000 HRPT1 MEN1, HRPT2
145001 HRPT2 HRPT2
610071 HRPT3 unknown at 2p13.3-14[6]

In all cases, the disease is idiopathic, but is thought to involve inactivation of tumor suppressor genes (Menin gene in MEN1), or involve gain of function mutations (RET proto-oncogene MEN 2a).

Recently, it was demonstrated that liquidators of the Chernobyl power plant are faced with a substantial risk of primary hyperparathyroidism, possibly caused by radioactive strontium isotopes.[7]

Diagnosis

The diagnosis of primary hyperparathyroidism is made by blood tests.

Serum calcium levels are usually elevated, and the parathyroid hormone level is abnormally high compared with an expected low level in response to the high calcium. A relatively elevated parathyroid hormone has been estimated to have a sensitivity of 60–80% and a specificity of approximately 90% for primary hyperparathyroidism.[8]

A more powerful variant of comparing the balance between calcium and parathyroid hormone is to perform a 3-hour calcium infusion. After infusion, a parathyroid hormone level above a cutoff of 14 ng/L has a sensitivity of 100% and a specificity of 93% in detecting primary hyperparathyroidism, with a confidence interval of 80% to 100%.[9]

Urinary cAMP is occasionally measured; it is generally elevated due to activation of Gs proteins when PTH binds to its receptor.[10]

Biochemical confirmation of primary hyperparathyroidism is following by investigations to localize the culprit lesion. Primary hyperparathyroidism is most commonly due to solitary parathyroid adenoma. Less commonly it may be due to double parathyroid adenomas or parathyroid hyperplasia. Tc99 sestamibi scan of head, neck and upper thorax is the most commonly used test for localizing parathyroid adenomas having a sensitivity and specificity of 70–80%. Sensitivity falls down to 30% in case of double/multiple parathyroid adenomas or in case of parathyroid hyperplasia. Ultrasonography is also a useful test in localizing suspicious parathyroid lesions.

Normocalcemic Primary Hyperparathyroidism

Normocalcemic PHPT was first recognized in 2009 by an international panel of experts.[11] By definition these patients have normal serum calcium (though usually in the upper range) and are typically found to have elevated PTH during workup for osteoporosis. In order to diagnose normocalcemic PHPT, ionized calcium levels should be normal, and all secondary causes for secondary hyperparathyroidism (such as vitamin D deficiency and chronic kidney disease) ruled out.

Treatment

Treatment is usually surgical removal of the gland(s) containing adenomas, but medication may also be required.

Surgery

The surgical removal of one or more of the parathyroid glands is known as a parathyroidectomy; this operation was first performed in 1925.[12] The symptoms of the disease, listed above, are indications for surgery. Surgery reduces all cause mortality as well as resolving symptoms. However, cardiovascular mortality is not significantly reduced.[13]

The 2002 NIH Workshop on Asymptomatic Primary Hyperparathyroidism developed criteria for surgical intervention . The criteria were revised at the Third International Workshop on the Management of Asymptomatic Primary Hyperparathyroidism . These criteria were chosen on the basis of clinical experience and observational and clinical trial data as to which patients are more likely to have end-organ effects of primary hyperparathyroidism (nephrolithiasis, skeletal involvement), disease progression if surgery is deferred, and the most benefit from surgery. The panel emphasized the need for parathyroidectomy to be performed by surgeons who are highly experienced and skilled in the operation. The Third International Workshop guidelines concluded that surgery is indicated in asymptomatic patients who meet any one of the following conditions:

  • Serum calcium concentration of 1.0 mg/dL (0.25 mmol/L) or more above the upper limit of normal
  • Creatinine clearance that is reduced to <60 mL/min
  • Bone density at the hip, lumbar spine, or distal radius that is more than 2.5 standard deviations below peak bone mass (T score <-2.5) and/or previous fragility fracture
  • Age less than 50 years

Operative intervention can be delayed in patients over 50 years of age who are asymptomatic or minimally symptomatic and who have serum calcium concentrations <1.0 mg/dL (0.2 mmol/L) above the upper limit of normal, and in patients who are medically unfit for surgery

More recently, three randomized controlled trials have studied the role of surgery in patients with asymptomatic hyperparathyroidism. The largest study reported that surgery resulted in an increase in bone mass, but no improvement in quality of life after one to two years among patients in the following groups:[14]

  • Untreated, asymptomatic primary hyperparathyroidism
  • Serum calcium between 2.60 and 2.85 mmol/liter (10.4–11.4 mg/dL)
  • Age between 50 and 80 yr
  • No medications interfering with Ca metabolism
  • No hyperparathyroid bone disease
  • No previous operation in the neck
  • Creatinine level < 130 μmol/liter (<1.47 mg/dL)

Two other trials reported improvements in bone density and some improvement in quality of life with surgery.[15][16]

Medications

Medications are used when surgery is not indicated or for poor surgical candidates.[17] Calcimimetics are used to reduce the amount of parathyroid hormone released by the parathyroid glands and subsequent hypercalcemia. Other medications used for PHPT includes treatments for osteoporosis such as estrogen replacement therapy, bisphosphonates or denosumab and for treatment hypercalciuria to reduce the risk for kidney stones.[18]

Epidemiology

Primary hyperparathyroidism affects approximately 1 per 1,000 people (0.1%),[19] while there are 25–30 new cases per 100,000 people per year in the United States.[20] The prevalence of primary hyperparathyroidism has been estimated to be 3 in 1000 in the general population and as high as 21 in 1000 in postmenopausal women.[21] It is almost exactly three times as common in women as men.

Primary hyperparathyroidism is associated with increased all-cause mortality.[13]

Children

In contrast with primary hyperparathyroidism in adults, primary hyperparathyroidism in children is considered a rare endocrinopathy. Pediatric primary hyperparathyroidism can be distinguished by its more severe manifestations, in contrast to the less intense manifestations in adult primary hyperparathyroidism. Multiple endocrine neoplasia is more likely to be associated with childhood and adolescent primary hyperparathyroidism. The fundamental skeletal radiologic manifestation include diffuse osteopenia, pathologic fractures and the coexistence of resorption and sclerosis at numerous sites. Skeletal lesions can be specifically bilateral, symmetric and multifocal, exhibiting different types of bone resorption. Pathologic fractures of the femoral neck and spine can potentially initiate serious complications. Because pediatric primary hyperparathyroidism is frequently associated with pathologic fractures it can be misdiagnosed as osteogenesis imperfecta. Pediatric patients with primary hyperparathyroidism are best remedied by parathyroidectomy. Early diagnosis of pediatric primary hyperparathyroidism is all-important to minimize disease complications and start off timely and relevant treatment.[22][23]

Research directions

Future developments such as calcimimetic agents (e.g. cinacalcet) which activate the parathyroid calcium-sensing receptor may offer a good alternative to surgery.

See also

References
  1. Barreras, R. F.; Donaldson, R. M. (1967). "Role of Calcium in Gastric Hypersecretion, Parathyroid Adenoma and Peptic Ulcer". New England Journal of Medicine. 276 (20): 1122–1124. doi:10.1056/NEJM196705182762005. PMID 6024167.
  2. Stefenelli T, Abela C, Frank H, et al. (1997). "Cardiac abnormalities in patients with primary hyperparathyroidism: implications for follow-up". J. Clin. Endocrinol. Metab. 82 (1): 106–12. doi:10.1210/jcem.82.1.3666. PMID 8989242.
  3. Bargren AE, Repplinger D, Chen H, Sippel RS (2011). "Can biochemical abnormalities predict symptomatology in patients with primary hyperparathyroidism?". J Am Coll Surg. 213 (3): 410–4. doi:10.1016/j.jamcollsurg.2011.06.401. PMID 21723154.
  4. "Endocrine Pathology". Retrieved 2009-05-08.
  5. "Endocrine Pathology". Retrieved 2009-05-08.
  6. Warner JV, Nyholt DR, Busfield F, et al. (March 2006). "Familial isolated hyperparathyroidism is linked to a 1.7 Mb region on chromosome 2p13.3–14". J. Med. Genet. 43 (3): e12. doi:10.1136/jmg.2005.035766. PMC 2563254. PMID 16525030.
  7. Boehm BO, Rosinger S, Belyi D, Dietrich JW (2011). "The parathyroid as a target for radiation damage". N. Engl. J. Med. 365 (7): 676–8. doi:10.1056/NEJMc1104982. PMID 21848480.
  8. Lepage, R.; d'Amour, P.; Boucher, A.; Hamel, L.; Demontigny, C.; Labelle, F. (1988). "Clinical performance of a parathyrin immunoassay with dynamically determined reference values". Clinical Chemistry. 34 (12): 2439–2443. doi:10.1093/clinchem/34.12.2439. PMID 3058363.
  9. Titon, I.; Cailleux-Bounacer, A.; Basuyau, J. P.; Lefebvre, H.; Savoure, A.; Kuhn, J. M. (2007). "Evaluation of a standardized short-time calcium suppression test in healthy subjects: Interest for the diagnosis of primary hyperparathyroidism". European Journal of Endocrinology. 157 (3): 351–357. doi:10.1530/EJE-07-0132. PMID 17766719.
  10. Jameson, J. Larry, éditeur intellectuel. (2018-08-13). Harrison's principles of internal medicine. ISBN 9781259644030. OCLC 1056749127.{{cite book}}: CS1 maint: multiple names: authors list (link)
  11. Silverberg, Shonni J.; Lewiecki, E. Michael; Mosekilde, Leif; Peacock, Munro; Rubin, Mishaela R. (February 2009). "Presentation of asymptomatic primary hyperparathyroidism: proceedings of the third international workshop". The Journal of Clinical Endocrinology and Metabolism. 94 (2): 351–365. doi:10.1210/jc.2008-1760. ISSN 0021-972X. PMC 5393372. PMID 19193910.
  12. Weber T, Eberle J, Messelhäuser U, et al. (2013). "Parathyroidectomy, elevated depression scores, and suicidal ideation in patients with primary hyperparathyroidism: results of a prospective multicenter study". JAMA Surg. 148 (2): 109–115. doi:10.1001/2013.jamasurg.316. PMID 23560281.
  13. Vestergaard, P.; Mosekilde, L. (2003). "Cohort study on effects of parathyroid surgery on multiple outcomes in primary hyperparathyroidism". BMJ. 327 (7414): 530–534. doi:10.1136/bmj.327.7414.530. PMC 192894. PMID 12958111.
  14. Bollerslev J, Jansson S, Mollerup CL, et al. (2007). "Medical observation, compared with parathyroidectomy, for asymptomatic primary hyperparathyroidism: a prospective, randomized trial". J. Clin. Endocrinol. Metab. 92 (5): 1687–92. doi:10.1210/jc.2006-1836. PMID 17284629.
  15. Ambrogini E, Cetani F, Cianferotti L, et al. (2007). "Surgery or surveillance for mild asymptomatic primary hyperparathyroidism: a prospective, randomized clinical trial". J. Clin. Endocrinol. Metab. 92 (8): 3114–21. doi:10.1210/jc.2007-0219. PMID 17535997.
  16. Rao DS, Phillips ER, Divine GW, Talpos GB (2004). "Randomized controlled clinical trial of surgery versus no surgery in patients with mild asymptomatic primary hyperparathyroidism". J. Clin. Endocrinol. Metab. 89 (11): 5415–22. doi:10.1210/jc.2004-0028. PMID 15531491.
  17. http://pi.amgen.com/united_states/sensipar/sensipar_pi_hcp_english.pdf
  18. Wilhelm, Scott M.; Wang, Tracy S.; Ruan, Daniel T.; Lee, James A.; Asa, Sylvia L.; Duh, Quan-Yang; Doherty, Gerard M.; Herrera, Miguel F.; Pasieka, Janice L.; Perrier, Nancy D.; Silverberg, Shonni J.; Solórzano, Carmen C.; Sturgeon, Cord; Tublin, Mitchell E.; Udelsman, Robert (2016-10-01). "The American Association of Endocrine Surgeons Guidelines for Definitive Management of Primary Hyperparathyroidism". JAMA Surgery. 151 (10): 959–968. doi:10.1001/jamasurg.2016.2310. ISSN 2168-6254.
  19. Deshmukh, R. G.; Alsagoff, S. A. L.; Krishnan, S.; Dhillon, K. S.; Khir, A. S. M. (1998). "Primary hyperparathyroidism presenting with pathological fracture". Journal of the Royal College of Surgeons of Edinburgh. 43 (6): 424–427. PMID 9990797. Archived from the original on 2011-05-13. Retrieved 2011-06-18.
  20. Bilezikian, John P.; Silverberg, Shonni J. (2002). "Primary hyperparathyroidism: Epidemiology and clinical consequences". Clinical Reviews in Bone and Mineral Metabolism. 1 (1): 25–34. doi:10.1385/BMM:1:1:25. S2CID 74793206.
  21. Bolland, M. J.; Grey, A. B.; Gamble, G. D.; Reid, I. R. (2004). "Association between Primary Hyperparathyroidism and Increased Body Weight: A Meta-Analysis". Journal of Clinical Endocrinology & Metabolism. 90 (3): 1525–1530. doi:10.1210/jc.2004-1891. PMID 15613408.
  22. EL-Sobky TA, Ahmad KA, Samir S, EL Mikkawy DME (2016). "Primary hyperparathyroidism in a child: The musculoskeletal manifestations of a late presenting rare endocrinopathy". Egypt J Radiol Nucl Med. 47 (4): 1613–16. doi:10.1016/j.ejrnm.2016.09.002.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  23. Mallet E (2008). "Primary hyperparathyroidism in neonates and childhood. The French experience (1984–2004)". Horm Res. 69 (3): 180–8. doi:10.1159/000112592. PMID 18219222. S2CID 25046706.
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