This week Andrea Byrne gets to grips with the skills needed to help someone who suffers a heart attack. We're also on board with the Swansea crew as they are called to help a young baby who’s in anaphylactic shock, and the North Wales Helimed attend a youngster with a head injury after been knocked down by a car near Bethesda.

Click below to watch earlier episodes in the series:Episode 1 Episode 2 Episode 3 Episode 4