GSTM1 and atrial fibrillation: Hemoglobin (Hb)(g/dL)and thrombocytes (×103/μL) were statistically significantly lower in hypertensive patients with AF, compared to hypertensive patients without AF, but without values within pathological limits (p < 0.05), and activated partial thromboplastin time(APTT)(s) was statistically significantly higher in patients with AF, 28.87 ± 7.97, compared to those without AF, 26.41 ± 4.46 (p < 0.05), possibly due to the presence of anticoagulant treatment in patients with AF.