An official Los Angeles County assessment has acknowledged for the first time that a woman who died after writhing in pain for nearly an hour on the waiting room floor of Martin Luther King Jr.-Harbor Medical Center could have been saved if she had been properly treated. The woman was captured on security videotape as a janitor mopped around her and a triage nurse dismissed her complaints. Her death helped to precipitate the closure of the hospital's emergency room and inpatient care after federal regulators determined that staffers had failed to deliver a minimum standard of care.