Predisposing Factors of Heart Attack:
These may include; Male gender, increased age, history of heart disease, family history of heart disease, high blood pressure, overexertion, obesity, diabetes, smoking and the use of certain drugs/medications before diving.

Signs & Symptoms of Heart Attack:
• Central chest pain may radiate to the arms and up to the jaw
• Indigestion & nausea
• Pallor, sweating
• Dizziness, anxiety & shortness of breath
• Heart irregularities and/or palpitations
• Unconsciousness, no breathing and pulse
• Cyanosis (blueness)
• Fixed, dilated pupils

First Aid Treatment for Heart Attack Conscious Diver:
• If short of breath, the injured diver may prefer to sit up
• Provide oxygen (preferably by constant flow)
• Monitor the consciousness, airway, breathing and pulse
• Call for immediate medical assistance

First Aid Treatment for Heart Attack Unconscious Diver:
• STOP - Assess and observe the scene
• THINK - Consider your safety and form action plan
• ACT - Check responsiveness
• ALERT EMS
• Begin CPR by providing 30 chest compressions, then open the airway and give two breaths.
• If you suspect possible drowning, begin CPR with rescue breaths before chest compressions
• Compress adult chest to a depth of at least 2 inches (5 cm) giving compressions at a rate of at least 100 per minute (push hard & fast)
• To minimize interruptions in chest compressions, if there is more than one rescuer present, continue CPR while the AED is switched on and the pads are being placed on the patient
• Reduced emphasis on barrier use when providing CPR, although still recommended, treatment should not be delayed if barriers are not available
• If the patient begins breathing, manage Serious Bleeding, Shock and Spinal Injury