- The CYP2C9 genotype predicts the blood pressure response to irbesartan: results from the Swedish Irbesartan Left Ventricular Hypertrophy Investigation vs Atenolol (SILVHIA) trial. Hallberg, P., Karlsson, J., Kurland, L., Lind, L., Kahan, T., Malmqvist, K., Ohman, K.P., Nyström, F., Melhus, H. J. Hypertens. (2002)