Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado

Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado (ISSSTE) is Mexico's federal social security institute for government employees, operating a nationwide network of hospitals and clinics serving millions of public-sector workers and their families. An ISSSTE-affiliated facility has participated in clinical research examining ketamine's effect on depressive symptoms in elderly patients with visual impairment.