A cancer charity said it could be "the most significant step toward a lifesaving-breakthrough" in 50 years.
Julia Dutton was found in the car park of Wrexham Maelor Hospital with a cannula still attached.
The man's widow said the incorrect prescription was like "a loaded gun".
It was one of 10 "never events" in the past 12 months in the NHS in north Wales, a report says.
The cost of fixing the most serious repairs at major hospitals alone is more than £600m, figures show.
The bond between a mum and her baby helps her on the long road back from a terrible brain injury giving birth.
William Phillips was found by other patients to be unresponsive in the hospital waiting room.
Busy hospital car parks cause patients to be late for their appointments.
A 90-year-old woman's family say they were not told about a cancer diagnosis until finding records.
