title: An unusual cardiac arrhythmia caused by hypocalcemia.
mesh_terms: D000200:Action Potentials; D001919:Bradycardia / Q000209:etiology*; D004200:Diseases in Twins / Q000503:physiopathology; D005260:Female; D006327:Heart Block / Q000209:etiology*; D006801:Humans; D006996:Hypocalcemia / Q000150:complications* / Q000503:physiopathology; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000503:physiopathology; D011690:Purkinje Fibers / Q000503:physiopathology