Table 1:

Investigations and levothyroxine dosage for a 45-year-old man with cardiomyopathy secondary to hypothyroidism

Investigation	On admission	Time since hospital discharge, mo				Normal range
Investigation	On admission	1	3	6	15	Normal range
TSH, mIU/L	196.2	104.8	11.3	2.25	1.2	0.27–4.2
fT4, pmol/L	1.8	6.69	13.8	17.9	17.5	11.58–23.17
BNP, pg/mL	1140	169	57	27.6	21.3	< 18.4
LVEF, %	28.4	30.1	34.4	35.8	43.9	55.0–80.0
Levothyroxine dosage, μg/d		37.5	112.5	150	150

Note: BNP = brain natriuretic peptide, fT4 = free thyroxine, LVEF = left ventricular ejection fraction (measured by using echocardiography), TSH = thyroid-stimulating hormone.