From October 2013 to June last year there were 172 people in the Northland area who suffered cardiac arrests.
The use of a defibrillator after cardiac arrest can increase the chance of survival by up to 40 per cent.
Northland St John acting district operations manager Ben Lockie, who is also an intensive care paramedic, said the two things that improved someone's chance of survival when suffering a heart attack were early defibrillation and good CPR.
"There is a short window of about four minutes for defibrillation to be successful. So if someone collapses at the gym or in a bank or nearby, if they utilise these machines it increases their chance of surviving immensely," Mr Lockie said.
"CPR is a skill anyone can learn and use even if there is no defib around."
He said St John wanted to see more of the defib machines in public places around the region.
In the case of a cardiac emergency, Northland ASB branches in Dargaville, Kaikohe, Paihia, Kaitaia, Kerikeri, Rathbone St, Walton St and Kamo now have the machines.
Nationally about 2500 New Zealanders are expected to attend workshops and more than 1300 ASB staff will receive training.
A defibrillator delivers a short electric shock to the heart, helping it to regain its natural rhythm.