Primary Hyperparathyroidism

Establish PHPT biochemically when serum calcium is elevated and PTH is increased or nonsuppressed. In a hypercalcemic patient, a PTH that falls within the assay reference interval remains inappropriately high and supports PTH-dependent hypercalcemia. This relationship is more useful than requiring both calcium and PTH to be above their reference ranges. PubMed+1PubMedPrimary hyperparathyroidism: review and recommendations on evaluation, diagnosis, and management. A Canadian and international consensus - PubMedccjmShould I refer my patient for a parathyroidectomy? | Cleveland Clinic Journal of medicine

Measure serum phosphate as a severity adjunct, not as a stand-alone diagnostic test. In a cohort of 472 patients with PHPT, phosphate below 2.5 mg/dL occurred in 41.9%; moderate hypophosphatemia of 1 to 1.9 mg/dL identified patients who were all symptomatic or met operative criteria. Lower phosphate was associated with higher calcium and PTH concentrations and more renal stones. endocrineendocrineSerum Phosphate in Primary Hyperparathyroidism | Endocrine Society

Do not use sestamibi, ultrasonography, or other localization studies to decide whether PHPT is present. Obtain imaging only after biochemical confirmation and a decision to pursue surgery, because its role is localization of operative targets. Imaging is important for adenoma localization, but patients with negative or discordant studies may still undergo unilateral parathyroidectomy in selected settings. JAMA+1JAMAIntraoperative Parathyroid Hormone Monitoring Criteria in Primary ...pubs rsnaContemporary Multimodality Imaging of Primary Hyperparathyroidism

In a patient with hypercalcemia and nonsuppressed PTH, obtain a 24-hour urine calcium and calculate the calcium-creatinine clearance ratio before committing to parathyroidectomy. FHH can resemble PHPT biochemically but is characterized by hypocalciuria, commonly below 100 mg/24 hours; a clearance ratio below 0.02 is a practical discriminator favoring FHH. Persistent hypercalcemia after parathyroid surgery has been reported when FHH coexists with or is mistaken for PHPT. ScienceDirect+1ScienceDirectAbstract #1408170: Familial Hypocalciuric Hypercalcemia, Primary Hyperparathyroidism, or Both? - ScienceDirectccjmShould I refer my patient for a parathyroidectomy? | Cleveland Clinic Journal of medicine

Offer genetic testing for heritable PHPT to patients with onset at age 40 years or younger, multiglandular disease, recurrent PHPT, or a family history of PHPT. Approximately 15% of PHPT has an underlying heritable form; recognizing this changes surveillance because MEN1 and MEN2A may carry extraparathyroid neoplasia risks. endocrineendocrineMolecular and Clinical Spectrum of Primary Hyperparathyroidism | Endocrine Society

For a high-risk familial phenotype, testing panels commonly include MEN1, RET, CDKN1B, and CDC73. Features increasing suspicion include young onset, a family history, multiglandular disease, hyperparathyroidism-jaw tumor phenotype, cystic parathyroid adenoma, and parathyroid carcinoma. Wolters KluwerWolters KluwerIndian Journal of Endocrinology and Metabolism

Refer patients with symptomatic PHPT for parathyroidectomy. The American Association of Endocrine Surgeons recommends surgery for all symptomatic patients; parathyroidectomy is the only definitive treatment and should be considered for most patients labeled asymptomatic. Early referral to an experienced endocrine surgeon is appropriate after biochemical diagnosis. JAMA+2JAMAAAES Guidelines for Primary Hyperparathyroidism ManagementScienceDirectPrimary Hyperparathyroidism: Diagnosis, Indications for Surgery, and Perioperative Management - ScienceDirectPubMedMedical management of primary hyperparathyroidism: proceedings of the fourth International Workshop on the Management of Asymptomatic Primary Hyperparathyroidism - PubMed

For apparently asymptomatic PHPT, identify renal, skeletal, biochemical, and age-related indications using current consensus criteria during the preoperative assessment. In a surgical cohort, the most frequent guideline-based indications were degree of hypercalcemia (51%), osteoporosis (28%), and nephrolithiasis (27%); patients younger than 50 years remain an established guideline-defined group for operative consideration. endocrineendocrineOlder Patients With Asymptomatic PHPT | Endocrine Society

Do not use absence of a classic indication as an automatic reason to withhold referral. Neurocognitive symptoms and osteopenia were common even among patients who did not meet established criteria, and the decision should incorporate disease manifestations, operative fitness, and informed patient preferences. endocrine+1endocrineOlder Patients With Asymptomatic PHPT | Endocrine SocietyccjmShould I refer my patient for a parathyroidectomy? | Cleveland Clinic Journal of medicine

Discuss the expected long-term tradeoff rather than framing surgery only as biochemical correction. In a national cohort, 10-year major osteoporotic fracture incidence was 5.20% after parathyroidectomy versus 7.91% without surgery; 10-year chronic kidney disease incidence was 21.2% versus 33.6%, respectively. Observational associations should inform shared decision-making rather than substitute for individualized assessment. endocrineendocrinePatient Characteristics, Management, and Outcomes in a Novel Cohort of Primary Hyperparathyroidism | Endocrine Society

Use nonsurgical management when the patient cannot undergo or declines parathyroidectomy, or while definitive treatment is being arranged. Observation without intervention is an alternative in asymptomatic patients without organ manifestations and with only mild hypercalcemia, whereas parathyroidectomy remains the only curative intervention. Wolters Kluwer+1Wolters KluwerIndividualized management of primary... : Journal of Internal MedicinePubMedMedical management of primary hyperparathyroidism: proceedings of the fourth International Workshop on the Management of Asymptomatic Primary Hyperparathyroidism - PubMed

Do not restrict calcium intake solely because PHPT is present. For patients managed without surgery, calcium intake should follow standard population guidance. Measure 25-hydroxyvitamin D and replete a low value to at least 50 nmol/L (20 ng/mL); a target of at least 75 nmol/L (30 ng/mL) is also recommended as a reasonable goal. PubMedPubMedMedical management of primary hyperparathyroidism: proceedings of the fourth International Workshop on the Management of Asymptomatic Primary Hyperparathyroidism - PubMed

Consider cinacalcet when reduction or normalization of serum calcium is the treatment objective and surgery is not feasible, is declined, or PHPT persists after parathyroidectomy. Available evidence indicates that cinacalcet can normalize calcium and lower PTH, including in persistent postoperative disease, but it has not shown a significant improvement in areal bone mineral density during long-term treatment. WileyWileyCinacalcet Treatment of Primary Hyperparathyroidism - Rothe - 2011 - International Journal of Endocrinology - Wiley Online Library

Reassess surveillance suitability when calcium rises, renal stones develop, skeletal disease emerges, or patient preferences change. Real-world adherence to monitoring recommendations is variable, and an initially nonsurgical plan should not become indefinite without periodic reconsideration of surgery. ScienceDirect+1ScienceDirectClinical Management of Primary Hyperparathyroidism and Thresholds for Surgical Referral: A National Study Examining Concordance Between Practice Patterns and Consensus Panel Recommendations - ScienceDirectWolters KluwerIndividualized management of primary... : Journal of Internal Medicine

For patients initially observed, monitor for changes that alter the surgical decision: worsening hypercalcemia, nephrolithiasis, osteoporosis, and renal decline are clinically meaningful PHPT outcomes. PHPT is associated with fractures, kidney stones, and chronic kidney disease, and a large cohort found lower 10-year incidence of major osteoporotic fracture and CKD among surgically treated patients. endocrine+1endocrinePatient Characteristics, Management, and Outcomes in a Novel Cohort of Primary Hyperparathyroidism | Endocrine SocietyendocrineMolecular and Clinical Spectrum of Primary Hyperparathyroidism | Endocrine Society

At each follow-up, revisit whether the patient still prefers observation and whether new end-organ disease has emerged. This is particularly important in older adults, in whom many patients have guideline-based indications driven by hypercalcemia, osteoporosis, or nephrolithiasis despite being labeled asymptomatic. endocrineendocrineOlder Patients With Asymptomatic PHPT | Endocrine Society

Escalate to endocrine surgery rather than repeating localization studies indefinitely when biochemical PHPT is established and operative indications or clinically important manifestations are present. Less than half of patients fulfilling surgical criteria receive parathyroidectomy, despite guideline-based support for surgery. JAMAJAMAQuality Indicators for the Diagnosis and Management of Primary Hyperparathyroidism