Patients with atypical P-wave morphology were more often female ( @ % vs. @ % , P = @ ) , had lower BMI ( @ @ kg/m ( @ ) vs. @ @ kg/m ( @ ) , P = @ ) , had more ischemic CHF ( @ % vs. @ % , P = @ ) and had smaller left atrial volumes ( @ @ mL vs. @ @ mL , P = @ ) .