Development of Severe Hyperparathyroidism Despite Short-Term Renal Replacement Therapy.

BACKGROUND

We occasionally experience cases of severe secondary hyperparathyroidism (SHPT) that require parathyroidectomy (PTX) despite undergoing short-term renal replacement therapy (RRT). Because the characteristics of such cases have never been discussed, we aimed to elucidate the pathophysiology of severe SHPT after short-term RRT by retrospectively analyzing clinical data.

METHODS

A total of 1013 patients with severe SHPT underwent PTX between January 2007 and April 2016 at Nagoya Daini Red Cross Hospital. Of these patients, 570 underwent RRT for ≥10 years (long RRT group) and 23 for ≤1 year (short RRT group). We retrospectively investigated and compared patient characteristics, preoperative data, subjective symptoms, and bone lesion incidence between the two groups.

RESULTS

A higher proportion of subjects with congenital or hereditary diseases as primary disease for chronic kidney disease (CKD) (21.7% (5/23) vs. 6.3% (36/570); P = 0.016) and longer predialysis period (21.2 ± 14.0 vs. 10.1 ± 9.2 years; P < 0.001) were observed in the short RRT group than in the long RRT group. Furthermore, lower serum calcium and phosphate levels, heavier parathyroid glands, and severe bone lesions were observed in the short RRT group than in the long RRT group.

CONCLUSION

Severe SHPT after short-term RRT appeared to occur because of long-term CKD before initiating RRT. Therefore, treating mineral and bone disorders during the early CKD stage might prevent severe SHPT development before initiating RRT.