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Hypocalcemic cardiomyopathy in a patient with idiopathic hypoparathyroidism
C Kudoh1, S Tanaka, S Marusaki
1Second Department of Internal Medicine, Sapporo Medical College, Japan.
Insights
Idiopathic hypoparathyroidism can cause severe cardiomyopathy due to low serum calcium. Correcting calcium levels dramatically improved cardiac function and normalized muscle enzyme levels in a patient.
Area of Science:
- Cardiology
- Endocrinology
- Biochemistry
Background:
- Idiopathic hypoparathyroidism can lead to severe, long-lasting hypocalcemia.
- Hypocalcemia can manifest with significant cardiac dysfunction, termed hypoparathyroidism-induced cardiomyopathy.
- Skeletal muscle involvement may present with elevated serum enzyme levels.
Observation:
- A patient with idiopathic hypoparathyroidism presented with severe hypocalcemia and cardiomyopathy.
- Cardiac function was assessed using echocardiogram and ventriculogram.
- Serum creatine phosphokinase (CPK) and lactate dehydrogenase (LDH) levels were elevated.
Findings:
- Correction of serum calcium concentration led to a dramatic and quantifiable improvement in cardiac function.
- Normalization of serum calcium levels resulted in the return of elevated CPK and LDH to normal ranges.
- Significant inverse correlations were observed between serum calcium concentration and serum enzyme levels.
Implications:
- Extracellular calcium ion concentration directly influences myocardial contraction strength via excitation-contraction coupling.
- Hypocalcemia-induced cardiomyopathy is potentially reversible with appropriate calcium level correction.
- Monitoring serum calcium and muscle enzymes is crucial for managing patients with idiopathic hypoparathyroidism and cardiac involvement.
Abstract:
An idiopathic hypoparathyroidism-induced cardiomyopathy patient had severe long-lasting hypocalcemia. The dramatic improvement of cardiac function with correction of only the serum calcium concentration could be quantitatively demonstrated on both echocardiogram and ventriculogram. The concentration of the extracellular calcium ion was considered to have a direct effect on the strength of the myocardial contraction through excitation-contraction coupling. Furthermore, elevated serum creatine phosphokinase and lactate dehydrogenase levels which were thought to be delivered from skeletal muscle returned to the normal range concomitant with the correction of hypocalcemia. The serum calcium concentration and these enzyme level showed significant inverse correlations.