Preterm heart failure and refractory lactic acidosis caused by congenital hypothyroidism: A case report and review of literature

Table 1 Changes in blood indexes before and after levothyroxine treatment during hospitalization

Blood index (unit)	Before treatment	After treatment	Reference range
BNP (pg/mL)	3959.67	13.26	(0-100)
cTnI (μg/L)	0.484	0.047	(0-0.06)
CK-MB (μg/L)	77.67	8.85	(0-5)
CK (U/L)	1039	89	(39-192)
Ammonia (μmol/L)	99.9	34.5	(10-47)
Pyruvate (μmol/L)	240.7	79.9	(20-100)
β-hydroxybutyric acid (mmol/L)	0.78	0.15	(0-0.27)

BNP: B-type natriuretic peptide; cTnI: Cardiac troponin I; CK-MB: Creatine kinase-MB; CK: Creatine kinase.