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Pseudoclubbing in chronic renal failure.

R Rault¹, B Carpenter

¹Department of Medicine, University of Pittsburgh School of Medicine, PA 15261.

The Quarterly Journal of Medicine

|November 1, 1989

Summary

Chronic renal failure patients with severe secondary hyperparathyroidism developed pseudoclubbing. While treatments improved radiological signs, finger deformities persisted, indicating parathormone autonomy is not always present.

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Area of Science:

Nephrology
Endocrinology
Radiology

Background:

Chronic renal failure (CRF) is associated with complex metabolic disturbances.
Secondary hyperparathyroidism is a common complication of CRF, involving elevated parathormone (PTH) levels.

Observation:

Seven patients with CRF presented with a unique digital abnormality termed pseudoclubbing.
Radiological assessments revealed severe secondary hyperparathyroidism in all patients.
Elevated C-terminal parathormone levels were consistently measured.

Findings:

Despite successful treatment interventions including vitamin D, calcium, parathyroidectomy, and renal transplantation, radiological evidence of hyperparathyroidism healed.
However, the fingertip deformities (pseudoclubbing) did not show improvement post-treatment.
This suggests that autonomous parathormone secretion is not an obligatory feature of severe secondary hyperparathyroidism in CRF.

Implications:

Pseudoclubbing may be a distinct clinical manifestation of severe secondary hyperparathyroidism in CRF patients.
The persistence of pseudoclubbing despite treatment highlights potential limitations in reversing all manifestations of severe hyperparathyroidism.
Further research is needed to elucidate the specific mechanisms underlying pseudoclubbing and its relationship with PTH levels and renal disease.

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