This episode's headline: Apartheid: Protest and Response; El Salvador's Duarte: Quest for Peace; The Heart Beat/New Implants & Bypass; Non-Bank Banks: In Whose Interest?. The guests include In Washington: Rep. WALTER FAUNTROY, Delegate, District of Columbia; JOHN CHETTLE, South Africa Foundation; Dr. EUGENE PASSAMANI, National Heart, Lung & Blood Institute; In New York: KENNETH GUENTHER, Independent Bank Association of America; ROBERT DOUGLASS, Chase Manhattan Bank; Reports from NewsHour Correspondents: CHARLES KRAUSE, in El Salvador; JUNE MASSELL, in Louisville, Kentucky. Byline: In New York: CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent