Association of Left Ventricular Global Longitudinal Strain (GLS) and NT Pro BNP Levels with Major Cardiovascular Events in Chronic Heart Failure Patients with Reduced Ejection Fraction I Gusti Ayu Wijayanty Permatasari1, Luh Oliva Saraswati Suastika1*, I Nyoman Wiryawan1, Anak Agung Wiradewi Lestari2 Abstract Background: Chronic heart failure (CHF) impairs the