You sent me a message asking for a paper on hypothyroidism and left ventricular failure. I've found this that might be of use:
Br Heart J. 1982 Sep; 48(3): 278–284.
doi: 10.1136/hrt.48.3.278
PMCID: : 7104121
Left ventricular function in hypothyroidism. Responses to exercise and beta adrenoceptor blockade.
J C Forfar, A L Muir, and A D Toft
Unfortunately there's a glitch in the chat box which prevented me replying to you there.
Link to full paper added by admin heart.bmj.com/content/heart...