Serum cTnT concentration measured within 2 weeks of the onset of PPCM was correlated negatively with LVEF at follow-up. This marker offers a simple, quick, inexpensive, non-invasive method for predicting a persistent LVEF of < or =50%. A cTnT concentration of >0.04 ng/ml predicted persistent left ventricular dysfunction with a sensitivity of 54.9% and a specificity of 90.9%.

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According to the decibel level of noise detection in the working environment, the research objects were divided into high noise group (more than 85 dB), low noise group (55 to 85 dB), and control group (less than 55 dB), the neurobehavioral core test battery (NCTB) was used to systematic tests all workers, radioimmunoassay was used to detect plasma catecholamine levels, and the relationship between noise intensities and the levels of plasma catecholamine was analyzed by canonical correlation. The result shows noise exposure will affect workers’ neurological function and the influence of noise on neurobehavioral function may be related to the increase of the levels of norepinephrine and dopamine in the plasma and the inhibition of the synthesis of epinephrine of noise-exposed workers.