McAlpine's character Fiz Stape will be left in a critical condition on New Year's Eve after suffering gas poisoning from a faulty boiler.
She told The Sunday People: "The gas poisoning line will leave viewers deeply worried for Fiz's health.
"Hopefully it will get people to check their boilers and get carbon monoxide monitors.
"There are 4,000 people a year who are affected and 50 die every year from something that could be very easily eliminated. I've been told by the people at the Gas Safety Register the publicity surrounding the plotline has saved lives already."
The boiler develops a gas leak when Fiz's boyfriend Tyrone Dobbs (Alan Halsall) tries to fix it.
McAlpine explained: "On Christmas Day Fiz's boiler seems to have packed up and the house is cold. At the same time, she starts to feel flu-like but she thinks she might be hungover. The symptoms are quite similar to feeling flu-like or feeling sick.
"Corrie have researched this so well, they have been working with the Gas Safety Register, who have been fab and explained about it. What Fiz does is not right.
"Tyrone fixes her boiler which you shouldn't allow - you should get someone who knows what they're doing and is registered."
Fiz is found on New Year's Eve in a coma and rushed to hospital.