"Also, the earlier the blocked artery is opened up, the less long-term damage there is to the heart muscle. Speed is critical."
Devlin says it's vital that all Kiwis are aware of the symptoms of a heart attack and act with urgency.
"It's okay to call for an ambulance, even if it turns out not to be a heart attack. Let the medical professionals do their job and determine whether the patient is having a potentially life-threatening event."
Symptoms of a heart attack can include chest discomfort lasting 10 minutes or more, pain that spreads to the jaw, shoulders or back, excessive sweating, shortness of breath and nausea.
"It's not always the dramatic chest-crushing pain that people imagine it to be."
Devlin explains women sometimes experience different symptoms to men such as discomfort in the upper back, nausea, sweating and unusual, unexplained fatigue.
The Heart Foundation will be running its national Heart Attack Awareness campaign from 09-31 July, for the third year. This campaign, with funding from the Ministry of Health and the Milestone Foundation, includes an award-winning television commercial.
The ad shows people in the foreground giving a 'Hollywood' performance of a heart attack, while the man on the bench in the background is quietly experiencing actual symptoms of a heart attack.
"Heart disease is New Zealand's biggest killer, claiming the lives of more than 6000 people every year, that's more than one family-member every 90 minutes. Many of these deaths are premature and could be prevented if people could recognise the symptoms and immediately dial 111."
Heart attack symptoms:
Symptoms of a heart attack can include: chest discomfort lasting 10 minutes or more, pain that spreads to the jaw, shoulders or back, excessive sweating, shortness of breath and nausea.
However, women in particular can experience other less obvious symptoms such as discomfort in the upper back, nausea, sweating and unusual fatigue.
Heart disease at a glance:
Heart disease is New Zealand's single biggest killer, claiming the lives of more than 6000 New Zealanders every year - that's one person every 90 minutes.
172,000 Kiwis are currently living with heart disease.