Participants experiencing hypotension, renal dysfunction, hyperkalemia and angioedema and by Renin-Angiotensin-Aldosterone System (RAAS) stratum (high vs. low) High RAAS stratum Patients receiving > 160 mg of valsartan or > 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening Low RAAS stratum: Patients receiving ≤ 160 mg of valsartan or ≤ 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening. This stratum also included patients who were not on an ACEI or an ARB 4 weeks prior to screening (i.e., ACEI/ARB-naïve patients)

Full Analysis Set (FAS) consisted of all randomized patients with the exception of mis-randomized patients who had not received the study drug, but had been inadvertently randomized into the study. Following the intent-to-treat principle, patients were analyzed according to the treatment to which they were assigned at randomization.

Treatment success was defined as the number of participants who achieved and maintained LCZ696 200 mg bid without any dose interruption or down-titration over 12 weeks and by Renin-Angiotensin-Aldosterone System (RAAS) stratum (high vs. low) High RAAS stratum Patients receiving > 160 mg of valsartan or > 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening Low RAAS stratum: Patients receiving ≤ 160 mg of valsartan or ≤ 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening. This stratum also included patients who were not on an ACEI or an ARB 4 weeks prior to screening (i.e., ACEI/ARB-naïve patients)

Evaluable patients in FAS with the exception of misrandomized patients who didn't received drug, but had been randomized into the study, excluding patients who discontinued the study prior to completion of 12 wks. Following the intent-to-treat principle, patients were analyzed according to the treatment to which they were assigned at randomization.

Tolerability was assessed as the number of participants who achieved LCZ696 200 mg bid and maintained this dose for at least 2 weeks before study completion, regardless of previous dose interruption or down-titration and by Renin-Angiotensin-Aldosterone System (RAAS) stratum (high vs. low) High RAAS stratum Patients receiving > 160 mg of valsartan or > 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening Low RAAS stratum: Patients receiving ≤ 160 mg of valsartan or ≤ 10 mg total daily dose of enalapril, or equivalent doses of other ARBs/ACEIs, respectively, at screening. This stratum also included patients who were not on an ACEI or an ARB 4 weeks prior to screening (i.e., ACEI/ARB-naïve patients)

Evaluable patients in FAS with the exception of misrandomized patients who didn't received drug, but had been randomized into the study, excluding patients who discontinued the study prior to completion of 12 wks. Following the intent-to-treat principle, patients were analyzed according to the treatment to which they were assigned at randomization.