How have codes of nursing ethics changed from the early to the later part of the twentieth century?

How have codes of nursing ethics changed from the early to the later part of the twentieth century?

You have a patient who is an HIV-positive physician. He has recently found out that he is HIV-positive. He is very concerned about confidentiality and you are the only one who knows he is HIV-positive. He asks you who you are legally obligated to inform. What should you tell him?

A 34-year-old man is brought to the emergency department with fever, headache, and a change in mental status leading to significant disorientation. His head CT is normal and he is in need of an urgent lumbar puncture and intravenous antibiotics. He is agitated and is waving off anyone who tries to get near him. Co-workers accompany him. The resident informs you that the patient is pushing away the lumbar puncture needle. What should you do?

A man comes to the emergency department after a stab wound. Your notes document a 500-mL loss of blood. Later that night the patient develops asystole and dies. You find the loss of blood was originally really 3,000 mL, which was not recorded by you. What should you do to correct the documentation?

An 18-month-old child presents to the clinic with a runny nose. Since she is otherwise well, the immunizations due at 18 months are administered. After she and her mother leave the clinic, you realize that the patient was in the clinic the week before and had also received immunizations then. Should you tell the parents about your mistake?