After 6 months , significant improvements were observed in the euthyroid group in the E/A ratio ( +41 % ; P < 0.001 ) , E deceleration time ( -18 % ; P = 0.006 ) , isovolumetric relaxation time ( -25 % ; P < 0.001 ) , E ' ( +31 % ; P < 0.001 ) , and the E ' / A ' ratio ( +40 % ; P < 0.001 ) .
