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What is the context of the ethics? If you let us know, it might be easier to advise you
With regards to some videos about ethics, a final year medical student called Ollie Burton makes some brilliant youtube videos. He has a series called "medical ethics made easy" that is worth giving a watch.
As for the idea of euthanasia and aborting, you need to consider each pillar of ethics separately as they will likely yield different outcomes. Also, I personally take a pro-choice stance, so my views may differ to that of others.
As for autonomy, it needs to be understood that all people approaching the NHS have their own free will (disregarding the issue of mental disabilities) and are free to make their own decisions based on healthcare. If the patient wishes to die or have an abortion, then under the autonomy section, it is their own right to do so. Whether this should be assisted by medical professionals is where it gets tricky.
Beneficence covers the idea that the HCP should work towards the benefit of the patient. So would having an abortion or being euthanized be beneficial to the patient, why yes? why no?
Non-maleficence is the idea of "do no harm" in the Hippocratic oath. If you support someone in dying, then you have done harm by killing them. With regards to abortion, that takes a bit more thinking as we all know of the ongoing debate of pro-choice and pro-life. Would having a child cause harm to the patient? Would refusing an abortion bring the patient any harm? This then links back to the idea of autonomy as they have the freedom to choose to have an abortion.
Justice simply covers the idea of fairness. Everyone treated equally. If you decide to proceed with an abortion for one patient and then another comes through the door with the exact same situation, it would be unethical to treat them differently just for the sake of it.
I hope these explanations are helpful, but feel free to ask any follow up questions. Most of the content is taken from my own experience with Medicine interviews that I went through this year, so should be relatively accurate