Heart surgery was being performed Monday morning . An exam revealed several blocked arteries , a hospital director said . The surgery was not expected to disrupt a high-level Venezuela - Venezuela meeting Saturday . Garzon underwent a cardiac catheterization procedure early Monday that showed he had several blocked arteries and needed heart surgery , said Carlos Alberto Cardona , scientific director at the Clinica Shaio cardiac center . Juan Manuel Santos was sworn into office on Tuesday .
Heart surgery was being performed Monday morning . An exam revealed several blocked arteries , a hospital director said . The surgery was not expected to disrupt a high-level Venezuela - Venezuela meeting Saturday . Juan Manuel Santos was sworn into office on Tuesday .