People who faint need to think carefully about what and how much they drink. Think of your body as a water tank with a minimum level needed to feed to brain with blood and oxygen to keep alert and conscious. If the water tank level drops below this minimum level you are “dehydrated”. For people who faint, it is crucially important to keep this tank as full as possible so that even if the level drops (pools due to gravity) into your lower limbs, which can act as large collecting vessels in your legs, there is still enough supply to the brain.
Vasovagal syncope, or more commonly known as fainting, is a condition that results in loss of consciousness which is usually transient without any prolonged complications, with rapid recovery and a return to normality afterwards. This condition is usually caused by low blood pressure or low heart rate or a combination of both. It is usually triggered by being in an upright position, particularly when there are other factors involved which predispose one to fainting which can include: dehydration, heat, stress, and being stood up in a single position for a long time.
In most cases, fainting is preceded by feeling dizzy, or lightheaded, and may also be associated with palpitations, sweatiness, and nausea. Fainting can usually be aborted if one is able to respond to the early warning symptoms by sitting down or lying down, whilst keeping the feet elevated.
Recurrent fainting is seen commonly in patients who have a low or low normal blood pressure and have previously experienced episodes of light-headedness and dizziness, particularly when standing for a long time or in the heat, such as crowded areas like a school assembly or on public transport. It is important to learn to recognise the symptoms before the fate, so that evasive action can be taken to avoid injury. This is more likely to occur when fainting happens from a standing position.
To ensure adequate hydration status at all times, but particularly before an event which is known to increase susceptibility to fainting success. Examples include standing for a long time or being in a warm, hot and crowded environment. If you are resting and your blood pressure is low or low normal (typically under 120/80), then you can consider having more salt in your diet (typically 1 to 2 teaspoons extra). Learn to take an early base of action by recognising symptoms of pre-fainting, such as dizziness, sweatiness, palpitations, and sitting down or squatting, and if possible, lying down with elevated feet to abort a fainting episode. Consider wearing compression stockings which should be worn from the toes or ankles, to the waist, which will help return blood that is starting to pool in the lower limbs during a faint. Rarely, if fainting continues and becomes a recurrent issue that affects your quality of life, it may be worth seeing a doctor who can pursue other strategies which includes carefully taking history and making an accurate diagnosis, as well as consideration of specific drugs that may be able to boost your blood pressure to minimise further episodes of fainting.
Major red flag symptoms for fainting or syncope include:
In these instances, you may need to seek urgent medical attention to rule out a significant non-benign cause of fainting.
People who faint need to think carefully about what and how much they drink. Think of your body as a water tank with a minimum level needed to feed to brain with blood and oxygen to keep alert and conscious. If the water tank level drops below this minimum level you are “dehydrated”. For people who faint, it is crucially important to keep this tank as full as possible so that even if the level drops (pools due to gravity) into your lower limbs, which can act as large collecting vessels in your legs, there is still enough supply to the brain.
Keeping your tank well filled, or hydrated, means that you need to:
Written By Dr Boon Lim
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Cardiology