| http://www.w3.org/ns/prov#value | - Yet they often have risk factors for heart disease, such as smoking, high blood pressure, and diabetes.SymptomsA person who has a VF episode can suddenly collapse or become unconscious, because the brain and muscles have stopped receiving blood from the heart.The following symptoms may occur within minutes to 1 hour before the collapse:Chest painDizzinessNauseaRapid heartbeatShortness of breathSig
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