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Blackout

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Blackouts, medically referred to as syncope, are episodes of transient loss of consciousness that can be alarming and indicative of underlying health issues. When these blackouts are associated with cardiac problems, they often stem from a disruption in the heart's ability to effectively pump blood, leading to insufficient blood flow to the brain.

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Cardiac causes of blackouts

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  • Arrhythmia's, which are irregular heartbeats that can either be too fast (tachycardia) or too slow (bradycardia). These disturbances can prevent the heart from maintaining an adequate cardiac output, resulting in a sudden drop in blood pressure and, consequently, a lack of blood supply to the brain. For instance, conditions such as atrial fibrillation or ventricular tachycardia can lead to significant drops in blood pressure, triggering a syncope (which is a black out).

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  • Structural heart disease such as aortic stenosis, where the narrowing of the aortic valve impedes blood flow from the heart to the rest of the body. This condition can lead to exertional syncope, where individuals may faint during physical activity due to inadequate blood flow.

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  • Cardiogenic syncope can occur due to heart failure, where the heart's weakened state fails to pump sufficient blood, particularly during times of increased demand. This can lead to episodes of dizziness or fainting, especially in older adults whose cardiovascular systems may be less resilient.

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  • Low blood pressure, or hypotension, is another factor that can contribute to blackouts. This can occur due to dehydration, blood loss, or certain medications that lower blood pressure. When blood pressure drops too low, the brain may not receive enough oxygen, resulting in a blackout.

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In summary, blackouts associated with cardiac issues can arise from a variety of causes. Understanding these causes is crucial for proper diagnosis and treatment, as timely intervention can prevent further complications and improve patient outcomes. If someone experiences recurrent blackouts, it is essential to seek medical evaluation to determine the underlying cause and appropriate management.

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At My Heart we can help you with these investigations and book a cardiology consultation as well if you need one.

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