Hypercalcaemia in rheumatoid arthritis revisited

Area of Science:

• Rheumatology
• Endocrinology
• Internal Medicine

Background:

• Hypercalcemia is a complex condition with various underlying causes.
• Previous research suggested a potential link between rheumatoid arthritis and hypercalcemia.
• Understanding the prevalence and mechanisms of hypercalcemia in specific patient populations is crucial for accurate diagnosis and management.

Purpose of the Study:

• To investigate the prevalence and etiological factors of hypercalcemia in patients attending a rheumatology referral center.
• To compare the causes of hypercalcemia in rheumatological patients with those reported in the general population.
• To evaluate the association between rheumatoid arthritis and hypercalcemia.

Main Methods:

• A prospective screening of 251 consecutive patients over three months.
• A retrospective analysis of 39 hypercalcemic patients from the preceding 12 months.
• Comprehensive diagnostic workup for all identified hypercalcemic cases.

Main Results:

• Prospective screening identified one case of hypercalcemia due to primary hyperparathyroidism.
• Retrospective analysis revealed that 97% of hypercalcemic patients had a known underlying cause.
• The most common causes were primary hyperparathyroidism (62%), thiazide treatment (13%), cancer (8%), and immobility (8%).

Conclusions:

• The etiological spectrum of hypercalcemia in rheumatological patients mirrors that of the general population.
• Hypercalcemia is not a frequent complication of rheumatoid arthritis itself, contrary to some previous reports.
• Primary hyperparathyroidism remains the leading cause of hypercalcemia in this cohort.