FIGURE 1.

Melatonin treatment attenuated cardiac systolic and diastolic dysfunction after exposure to PM_2.5. A, Left ventricular diastolic function after melatonin treatment. B, Diastolic left ventricular wall thickness and volume after melatonin treatment. C, Systolic left ventricular wall thickness and volume after melatonin treatment. D, Ejection fraction with melatonin treatment. E, Fractional shortening with melatonin treatment. F, Left ventricular mass with melatonin treatment. Data are expressed as the means ± SD; n = 6 in each group. *P < .05