CHRNA7 and familial dilated cardiomyopathy: Consistent with the previous animal data, we found that the expression levels of ChAT, CHT1, AChE, VAChT, and α4 and α7 nAChR were significantly lower in the VT/VF patient group than those in the sinus rhythm patient group, regardless of whether the underlying cause was ICM or DCM (Figure 7A).