"severe heart attack" is correct and usable in written English.
You can use it when referring to a serious medical condition involving the heart, usually caused by blocked arteries. For example: "He suffered a severe heart attack and had to be rushed to the hospital immediately."
CommInsure requires a certain blood level of Troponin to prove a severe heart attack, but cardiologists say it is impossible to measure the severity using that indicator in isolation, the investigation found.
But a severe heart attack can lead to cardiac arrest.
In 1937 he suffered a severe heart attack.
Doctors said Crown Prince Paras, 36, was in stable condition after suffering a severe heart attack.
More recently her husband, George Guijarro, 47, suffered a severe heart attack.
Parfitt suffered a severe heart attack in June this year after a performance in Antalya, Turkey.
The companies also won European approval to sell Plavix for patients with severe heart attacks, Bloomberg News reported.
To date, human and animal trials - there have been quite a few - in which stem cells were injected into cardiac tissue to treat severe heart attacks or substantial heart failure have mostly produced poor results.
Although he was indicted in 1970 for hijacking and although the U.S. Supreme Court in 1970 also upheld an order for his deportation (because of illegal entry into the country), severe heart attacks deferred trial or deportation.
The method is similar in principle to a surgical procedure used to help treat some heart surgery patients or those with severe heart attacks, Sack said.
Axton, also a familiar character actor, died at his ranch in Victor, Mont., after suffering two severe heart attacks in two weeks.
