Syncope

bradycardia fainting

What is syncope?

Syncope is a medical term used to describe a person fainting. It usually happens when there isn’t enough blood flow to the brain. This occurs when the blood pressure is too low and the brain doesn’t receive enough oxygen. Syncope is usually a symptom of an underlying medical problem.

Syncope is a very common condition. 3.5% women and 3% of men have syncope at some point in their life. It is more prevalent in older adults, with 6% of people over the age of 75 being affected by this condition.

How does syncope occur?

bradycardia faintingTo understand how fainting occurs, it is important to understand how the brain functions.

The brain requires constant blood flow for it to get oxygen and glucose. For a person to be awake, the reticular activating system, an area located in the brain stem, needs to be turned on. Also, at least one of the hemispheres in the brain needs to be active. Fainting occurs when the reticular activating system loses its blood supply or both the hemispheres of the brain are inactive due to them being deprived of oxygen or glucose.

Types of Syncope

There are several types of syncope and it usually depends on the underlying problem. Some of the most common ones are

Vasovagal syncope

This is the most common type of syncope. This happens when the body overreacts to certain triggers, such as shock, the sight of blood or emotional distress. The part of the nervous system that regulates heart rate and blood pressure malfunctions in response to these triggers.

This causes a sudden drop in heart rate and blood pressure, which in turn leads to reduced blood flow in the brain. This results in a person briefly losing consciousness (less than a minute).  Some of the symptoms of vasovagal syncope include

  • Pale skin
  • Lightheadedness
  • Tunnel vision
  • Nausea
  • Feeling warm
  • Cold, clammy sweat
  • Yawning
  • Blurred vision

Vasovagal syncope is generally harmless and does not require any treatment. However, your doctor may recommend you more test to rule out other causes such as heart problems.

Situational syncope

stress, anxiety, depressionThis is a type of vasovagal syncope that occurs only in certain situations like

  • Having blood drawn
  • Straining while urinating or defecating
  • Coughing
  • Dehydration
  • Intense emotional stress
  • Anxiety
  • Fear
  • Pain
  • Hunger
  • Excessive use of alcohol or drugs
  • Hyperventilation (breathing too fast)

When faced with these triggers, the person feels nauseated, sweaty, and weak just before losing consciousness. Situational syncope happens due to something known as the vasovagal reaction, a reflex of the involuntary nervous system. The vasovagal reaction prompts the heart to slow down and the blood vessels in the legs to widen. As a result, less blood is pumped and most of the circulating blood is directed towards the legs. When the brain is deprived of oxygen, fainting occurs.

Postural syncope

Also known as postural hypotension, this type of syncope occurs when there is a drop in blood pressure due to a sudden change in position of the body (for example, when you suddenly get up from a lying position).

Postural syncope is characterized by a decrease in systolic blood pressure of at least 20 mm Hg or diastolic blood pressure of at least 10 mm Hg when a person stands up. Depending on the time taken for the blood pressure to drop, postural hypotension can be divided into three types

  • Vasovagal orthostatic hypotension: This happens almost suddenly
  • Classic orthostatic hypotension: This type happens within three minutes
  • Delayed orthostatic hypotension: This type happens gradually.

Postural syncope occurs due to delayed or absent constriction of the blood vessels of the lower body. Constriction in the lower blood vessels is required to maintain a normal blood pressure when the position of the body is changed to standing. When the constriction is delayed or absent, the blood in the legs takes a longer time to reach the heart and this decreases the blood flow to the brain. Postural syncope can also make you feel dizzy or lightheaded.

Neurologic syncope

This type of syncope happens due to a condition such as

  • Seizure
  • Stroke
  • Transient ischemic attack (TIA)

Other less common conditions that lead to neurologic syncope include

  • Migraines
  • Normal-pressure hydrocephalus

Causes

Syncope is often triggered by the vagus nerve, which connects the digestive system to the brain. Its main function is to regulate the blood flow to the abdominal region. When a person eats food, the vagus nerve directs more blood into the stomach and intestine. However, sometimes the vagus nerves can also trigger syncope by directing too much blood away from the brain. This can happen due to the following reasons.

Panic attack

Panic attacks are a common cause of syncope. During a panic attack, a person starts to hyperventilate (breathing faster and more deeply). When this happens, the body takes in too much oxygen and gets rid of too much carbon dioxide. When the carbon dioxide levels in the body become low, the blood vessels start to constrict and this leads to the reduced blood supply to the brain.

Dehydration

Dehydration is a condition that happens when the amount of fluids lost by the body exceeds the amount that is taken in. This may happen due to vomiting, diarrhea or increased urination due to an infection.  When dehydration occurs, the vagus nerve is stimulated and this leads to syncope.

Pain

Pain can stimulate the vagus nerve and is a common cause of fainting. Syncope generally occurs when the body does not feel it can tolerate pain. This is a defense mechanism that the body uses in case of intolerable pain.  Syncope resulting from pain differs from person to person due to each individual having his/her own level of pain tolerance.

Emotional distress

Syncope also happens when people are under extreme emotional distress. For example, a person may faint if he/she gets some upsetting news like the death of a loved one. It may also happen in the presence of certain triggers like medical students fainting while observing their first autopsy or surgery. The vagus nerve is stimulated by certain hormones which are released when the body is under emotional distress.

Shock

Shock is a serious state that results due to decreased blood flow to the brain and other important organs. Shock may result due to

  • Loss of blood
  • Severe allergy
  • Severe infection
  • Dehydration
  • Poisoning
  • Burns

Shock usually leads to unconsciousness due to the disruption in the blood flow to the brain.

Alcohol abuse

Many people faint after drinking a lot of alcohol. A rapid rise in the alcohol levels in the blood prompts the vagus nerve to induce syncope so not the intake is stopped. Fainting after drinking alcohol is a sign of serious intoxication. Alcohol also makes a person dehydrated (due to too much urination), dilates blood vessels and decreases blood pressure. All these results in syncope.

Anemia

Anemia is a condition that is used to describe a condition in which a person doesn’t have enough healthy red blood cells. There are several types of anemia. These are

  • Iron deficiency anemia.
  • Vitamin deficiency anemia
  • Anemia of chronic disease
  • Aplastic anemia
  • Anemias associated with bone marrow disease.
  • Hemolytic anemias.
  • Sickle cell anemia

When the anemia is severe, fainting occurs as they are not enough red blood cells to deliver oxygen to the brain.

Drugs

Illegal drugs and prescribed drugs can also lead to syncope due to dehydration or drops in blood pressure. Here are a few drugs that may make you faint.

  • Nitrates: These drugs lower blood pressure and this results in you fainting
  • Diuretics: These drugs make you urinate more and that can lead to dehydration, which in turn may lead to fainting.
  • Opiates: These drugs work by lower blood pressure and slowing breathing
  • Heart drugs: These also decrease blood pressure
  • High blood pressure drugs: These also lower blood pressure

Abnormal Heart Beat

The heart plays a vital role in maintaining blood pressure. The heart is the organ that is responsible for forcing blood through the arteries and veins. If the heart beats abnormally, it is unable to maintain the required blood pressure. This results in reduced blood flow to the brain, which in turns results in fainting.

Symptoms

The most common symptom of syncope is dizziness just before fainting. However, it may also have the following symptoms

  • Feeling lightheaded
  • Falling
  • drowsiness or grogginess
  • Weakness after eating or exercising
  • unsteadiness or weakness when standing
  • Changes in vision
  • Headaches

People often experience “premonitory symptoms” before a spell of syncope. These may include

  • Heart palpitations (irregular heartbeats)
  • Lightheaded
  • Nausea

Diagnosis

Although most cases of syncope are harmless, you should see a doctor if you faint without any reason. You may be referred to a syncope specialist for a complete evaluation

If you have syncope, you should see your doctor, who can refer you to a syncope specialist for a complete evaluation. He/she will begin by doing a physical exam after carefully evaluating your medical history. You will then be asked questions about your syncope episode or episodes.

You may need tests, including electrophysiology studies, autonomic nervous system testing, neurological evaluation, and computed tomography (CT) scan. Vestibular function testing may be done to rule out problems in the inner ear. If you need any additional testing, your doctor will explain them and why they are needed.

You may then have to do the following tests

  • Tilt Test: This test is done to determine the amount of blood in your body, and the flow in different positions. During this test, you will be put in a bed that tilts vertically. Your oxygen level, heart rate, electrical impulses in the heart and blood pressure is then recorded as you’re tiltedat different angles.
  • Blood tests: This is done to check for anemia or any other blood abnormalities.
  • Electrocardiogram (EKG or ECG): This test is done to check the electrical activity of the heart. During this test, electrodes are attached to the skin near your heart. These record the electrical activity of the heart.
  • Exercise stress test: This test involves a person walking on a treadmill or riding a static bike while the heart is monitored.
  • Ambulatory monitor: You will wear a monitor that uses electrodes to record information about your heart’s rate and rhythm.
  • Echocardiogram: This test uses sound waves to make a pictorial representation of the heart. During the test, a transducer (a wand-like substance) is kept near your chest. This device produces sound waves that are directed towards your heart. These sound waves bounce off your heart to produce an image that is processed electronically. This test can determine the heart is functioning normally.
  • Blood volume determination: This is a test done to see the amount of blood in your body based on your gender, height, and weight.
  • Hemodynamic testing: This test is done to determine the blood flow and the pressure inside your blood vessels.
  • Autonomic reflex testing: This is a series of tests that are done to monitor blood pressure, blood flow, heart rate, skin temperature and sweating in response to certain stimuli.

Treatment

Treatment will usually depend on treating the underlying disease that caused the syncope. However, you may be asked to follow these measures.

  • Make changes to certain medications that you are currently on
  • Improve blood circulation by wearing garments or compression stockings
  • Change your diet
  • Be careful while changing the position of the body
  • Elevate your head while sleeping
  • Avoid certain triggers that induce a syncope episode
  • Do biofeedback training to slow down the fast heart rate
  • Undergo treatment for heart problems
  • Get a pacemaker implanted to keep your heart rate steady

Presyncope

Presyncope is the term to refer to a state when a person almost loses consciousness, usually due to reduced flow of blood to the brain. Some of the symptoms of presyncope include

  • Dizziness
  • Lightheadedness
  • Vertigo
  • Blurry or narrowed vision
  • Nausea
  • Vomiting
  • Headache
  • Sweating
  • Heart palpitations
  • General abdominal discomfort
  • Confusion or disorientation
  • Slurred speech

Presyncope is not that dangerous as the person doesn’t actually lose consciousness and the likelihood of injury is reduced. However, you should immediately see the doctor as presyncope may also be a sign of an underlying health condition.

How to help a person who has fainted?

You can help a person who has fainted by following these measures

  • If the person has not fainted but is showing the signs of syncope then help him/her lie down
  • Raise his/her legs by putting lifting their ankles to induce the blood flow back to the brain.
  • Try to wake the person up by tapping them or calling their name. You may also sprinkle some water on their face.
  • After he/she wakes up to tell them to lie down for at least 15-20 minutes.

Prevention

Although syncope is something that cannot be prevented, you can take certain measures to prevent it from happening.

  • If your fainting is caused by some triggers (for example, the sight of blood) try to avoid it.
  • If you feel lightheaded while standing up, move slowly while changing the position of your body.

Facts

  • People of any age can faint, but syncope in older adults is usually an indication of a serious underlying cause.
  • According to stats, 1 in 3 people experience syncope

Facts

  • Fainting was called swooning in England during the Victorian era
  • Well-to-do women in England often had something called a “fainting room” in the Victorian era

Facts

  • Popular to contrary belief, a blow to the head doesn’t necessary result in fainting

Related Conditions

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Dos and Don'ts

Dos
  • Always loosen the victim’s clothing, especially if it is tight
  • Apply a moist towel to the victim’s face and neck
  • Remove the victim’s glasses (if he/she wears one)
Don'ts
  • Slap or shake someone who’s just fainted
  • Try to give the victim any food or drink
  • Don’t try to lift the victim
  • Allow the victim to get up right away after he/she recovers

 

 

 

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Element 22 test (Nutrients & Toxicity) The element 22 test is used for measuring and monitoring the levels of heavy metals and some nutrients…
oral hygiene tips
6 shocking consequences of bad oral hygiene (and how to avoid them) Did you know bad breath is not just turning off, but also harms your body in ways you…
Dragon Fruit – Blessing from Nature’s Basket The dragon fruit is packed with nutrients and yet low on calories and is the dream food that…
bananas exercise
10 health reasons why you should go “bananas” over bananas! Bananas:The world's most popular fruit comes with a host of unbelievable health benefits. Find out how you can…
ashwagandha brain
Ashwagandha: The best-kept secret of Ayurveda now revealed! Ashwagandha literally means "smell of horse". Don't get bogged down by that one tiny detail because this ayurveduic…
Anhedonia: Does the chronic inability to feel joy affect you too? How often do you feel dragged down by an invisible force? Do you feel an inexplicable emotional numbness…
What to eat, what not to eat in the South Beach Diet? The South Beach Diet is one among the most popular weight loss programs that have been the talk…
Low fat diets
A complete list of low-fat diets and how to follow them Low-fat diets help you lose weight in a healthy way, but it works only with regular exercise and…
Urologist: When should you visit one and why? A urologist can treat not only genitourinary problems of both men and women but also can treat various…
How to scrub away stress and fatigue with an Epsom salt bath? Epsom salt is a popular home remedy for many skin ailments. Though there is a lack of scientific…
liver cleanse detox
14 go-to foods that are best for a complete natural liver detox Liver cleanse can be achieved by just choosing or avoiding certain types of food. Liver itself is a detoxifying…
Hysteroscopy_procedure
Hysteroscopy Hysteroscopy is a minimally invasive tool to help specialists view the uterus to diagnose and even treat several…
c peptide test
C-Peptide test C-peptide is a blood or urine test which is used to monitor and assess the insulin production by…
smelling-salts-benefits
The actual science behind smelling salts and how it helps in injury recovery Most smelling salts are a mixture of ammonium carbonate and some perfumes which are sniffed by an individual…
stress depressed anxiety
Are you depressed or just stressed? Know when to see a doctor Why are some people more anxious than others? Is being depressed the same as feeling sad? Have you…
cold flu sinus treatment
How to beat the common cold, flu, and sinus infection instantly? Can you guess some of the easiest tricks to treat cold and sinus infections? How are these different…
improve digestion weight loss
Power up your gut: 8 proven steps on how to improve your digestion Did you know you have a colony of bacteria in your gut that help you in digesting food?…
High Fiber Diet – Fire up your fiber intake for these health benefits! Regular bowels, healthy detox, higher immunity, and guaranteed weight loss - a high fiber diet can bring all…
Epley maneuver: Why is this the best protection from the symptoms of vertigo? Epley maneuver is an exercise that can treat the symptoms of benign paroxysmal positional vertigo (BPPV).  It was…
Hemp Seeds: The actual science behind this controversial crop Inspite of being credited as a superfood, hemp seeds are still shrouded with layers of controversies. Are these…
Experts reveal the safest ways to perform an enema at home The idea of pushing some up your rectal area might make you queasy but an enema could actually…
Vagus nerve: 7 health benefits of stimulating the “gut-brain” connection As a matter of fact, there are two vagus nerves namely the left and the right but is…
Sputum test Sputum test is a commonly used diagnostic tool that is used to examine the presence of pathogens in…
CT-scan-machine
CT – Computed Tomography Scan CT scan or computed tomography scan is an diagnostic imaging technique where cross-sectional images of body are obtained…
glucose-tolerance
Oral Glucose Tolerance Test – GTT Glucose tolerance test (or Oral GTT) is used to detect the onset of diabetes or prediabetes conditions. It…
BoneMarrow-Biopsy
Bone Marrow Biopsy Bone marrow biopsy is a diagnostic procedure where a small amount of bone marrow is extracted from hip…
thyroid_scan
Thyroid Scan Thyroid scan is a diagnostic procedure that aims to view the thyroid gland and detect any growths or…
myelogram
Myelography Myelography is an important diagnostic tool that is used to investigate and identify abnormalities in the spine and…
fructosamine test
Fructosamine Test A fructosamine test is a blood test that measures blood sugar glucose content. Fructosamine level can indicate blood…
ureteroscopy
Ureteroscopy Ureteroscopy is the diagnostic procedure which is used for the detection of the kidney stones in addition to…
about mediterranean diet
Why you should be adopting a Mediterranean style of diet today Ever wondered why the Mediterranean diet is so healthy? One simple solution to lowering risk of several deadliest…