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Sudden Cardiac Arrest

July 12 / 2025

 

 

     The human heart typically beats 60-80 times per minute, circulating blood throughout the body. However, in cases of Sudden Cardiac Arrest (SCA), the heart either stops or beats ineffectively, failing to supply blood to vital organs. This critical event stems from an underlying electrical malfunction within the heart.

 

What is Sudden Cardiac Arrest (SCA)?

     Sudden Cardiac Arrest (SCA) occurs when the heart abruptly ceases to effectively pump blood, or stops beating altogether. This is primarily due to a problem with the heart's electrical system, which regulates its rhythm.

 

Who is at Risk for SCA?

     SCA can affect anyone, often striking suddenly and without warning, leaving no time for preparation. Individuals with pre-existing cardiac arrhythmias are at higher risk due to inherent electrical system issues. Those with coronary artery disease may also experience SCA triggered by their condition.

 

Risk Factors for SCA:

  • Family history of SCA
  • High blood pressure
  • Smoking
  • Diabetes
  • High cholesterol
  • Unexplained fainting spells
  • Existing abnormal heart rhythms
  • Coronary artery disease
  • Prior myocardial infarction (heart attack)

 

Symptoms of SCA

An individual experiencing SCA will immediately lose consciousness due to a lack of blood flow to the brain from the stopped heart. Other accompanying symptoms include:

 

  • Unconsciousness/collapse
  • Absence of pulse
  • Cessation of breathing

 

Note:

     Individuals with pre-existing heart conditions, such as coronary artery blockages, myocardial infarction, hypertrophic cardiomyopathy, weakened heart muscle, or heart failure, are at high risk for SCA. They should seek consistent medical treatment and follow-up to discuss preventive measures against SCA.

 

Detecting SCA Risk

  • Electrocardiogram (EKG): To assess the heart's electrical activity.
  • Echocardiogram: To measure the heart's pumping efficiency.

 

 


For patients with known abnormal heart rhythms, proper treatment is crucial. Caution is advised as some anti-arrhythmic medications can, if not carefully managed, potentially induce SCA.

 

Note: 

     High-risk heart patients or SCA survivors may have an Implantable Cardioverter-Defibrillator (AICD) placed in their chest. This electronic device acts as a personal physician, automatically delivering an electrical shock to restore normal heart rhythm if SCA occurs. Patients with weakened heart muscle should consult their physician regarding the suitability of an AICD.

 

Preventing SCA

For chronic conditions like diabetes or high blood pressure, maintaining levels within physician-recommended ranges is essential. Additionally, individuals with other heart conditions should undergo EKG evaluations, as SCA often strikes suddenly.

 

  • Quit smoking and avoid alcohol.
  • Review family medical history.
  • Undergo regular health check-ups.
  • Manage high cholesterol, high blood pressure, and diabetes effectively.
  • Have regular EKG screenings.

 

What to Do if Someone Collapses?

If you see someone collapse or fall to the ground, immediately check for consciousness, pulse, and breathing. A sudden collapse could indicate SCA, requiring immediate life support.

 

  • Initiate basic life support (BLS) or call for assistance.
  • Call the nearest hospital or emergency number 1669.
  • Utilize an Automated External Defibrillator (AED) if available.

 

 


Sudden Cardiac Arrest can occur to anyone, often striking abruptly and without prior warning. Individuals with pre-existing cardiac arrhythmias are at a higher risk.