Neurological biomarkers within the AF group did not differ significantly before and after electrical cardioversion for GFAP (median of 28.7 pg/mL before electrical cardioversion vs. 27.7 pg/mL after electrical cardioversion, p = 0.347), UCH-L1 (median of 115.8 pg/mL before electrical cardioversion vs. 114.9 pg/mL after electrical cardioversion, p = 0.885), and NFL (median of 15.4 pg/mL before electrical cardioversion vs. 15.0 pg/mL after electrical cardioversion, p = 0.886) before and after electrical cardioversion (Figure 2). The gene discussed is NEFL; the disease is atrial fibrillation.