What triggers vasovagal syncope

It can be triggered by a multitude of factors, including biological and environmental factors. Learn about its causes, symptoms, and treatment here. Playing a brass instrument. So in most cases, as long as the syncopal episode What causes vasovagal syncope? Several triggers can cause vasovagal syncope. To help reduce the risk of fainting, you can stay away from some of these triggers, such as: Standing for long periods. Generally, there is no serious underlying cause of vasovagal reflex syncope. Vasovagal syncope is a complex reflex arc with poorly understood efferent and afferent limbs, it is extremely common, and has been estimated to affect up to one-third of the general population at some time . Eating a meal. It is due to inadequate cerebral perfusion most often caused by a fall in systemic arterial pressure. Hypnotherapy provides a non-invasive approach to addressing the underlying causes of fainting episodes, such as anxiety and stress. This results in a loss of consciousness, often accompanied by convulsive movements. May 17, 2017 · Syncope definition. Oct 21, 1993 · Reflex syncope is a neurally-mediated transient loss of consciousness that occurs when the body inappropriately reacts to triggers such as intense emotion, pain, or trauma, sudden postural changes, or others. This causes the heart rate to slow and decreases the amount of blood flowing to the brain, which causes a person to faint. Vasovagal syncope, the most common cause of fainting, is an abrupt and often unexpected reflex that prompts a sudden drop in your heart rate and blood pressure, leading to loss of consciousness. Syncope is usually called fainting or “passing out. Patients with syncope have a risk of recurrence and need to be closely followed up. There are many types of triggers, which can include things like intense pain, distress, or Dec 2, 2014 · Often in vasovagal syncope, the sufferer will experience prodromal (warning) symptoms such as nausea (feeling sick), sweating, light-headedness or going pale. 5% of women at some point in life. , due to. Common triggers, symptoms of vasovagal What is vasovagal syncope? Vasovagal syncope, also called a “common faint”, is a brief loss of consciousness due to a vasovagal reflex. It often occurs after standing for a while or under emotional distress. Cardiac syncope is a higher risk in men and those over age 60. Intense emotion, such as fear. There are different types of syncope; they depend on the part of the body affected or the cause of blood flow changes. Dehydration. 5 Vasovagal syncope is the most common type in young adults but can occur at any age. ”. Syncope is a syndrome in which loss of consciousness is of relatively sudden onset, temporary (usually <1–2 min), self-terminating, and of usually rapid recovery. Some common examples are during urination, after coughing, or fear of a painful stimulus (like blood draws). This effect of serotonin signaling alleles on vasovagal syncope supports the serotonin hypothesis of the physiology of vasovagal syncope. Benign causes often lead to syncope. Various factors, including dehydration, medication use, and heart conditions, can trigger it. The vasovagal response, also known as vasovagal syncope, is a specific type of fainting episode. I’ve even had a patient faint while simply only discussing the cause of his red eye and the need for medication (no drops had even been instilled, or Vasovagal syncope is fainting caused by a complex nerve and blood vessel reaction in the body. rapid onset. Vasovagal syncope It is common in young people following emotional response, such as fear, anxiety or disgust, but may also happen due to prolonged standing. Although individual Vasovagal Syncope or Neurocardiogenic Syncope. Feb 21, 2016 · Neurally mediated syncope is due to an inappropriate autonomic reflex in response to a trigger and hence this is also known as reflex syncope. It is thus a combination of vasodilation and Nov 4, 2023 · When triggered, the vasovagal reflex causes a sudden drop in heart rate and blood pressure. Nov 17, 2022 · Symptômes liés à la vision. Sudden abdominal pain. This condition occurs when the body reacts to certain triggers by initiating an exaggerated response of the vagus nerve, a crucial part Jul 8, 2009 · EEG in vasovagal syncope. The vasovagal reflex is the combination of: sympathetic withdrawal causing vasodilation (vaso), and parasympathetic (vagal) disinhibition causing bradycardia. When heart rate slows or blood pressure drops, the resulting lack of blood to the brain causes fainting. Avoiding triggers is the best way to prevent future fainting episodes. This article unpacks the triggers behind this reflex, outlines the symptoms to watch for, and provides practical management tips to help Dec 28, 2023 · Vasovagal Syncope is the most common type of syncope – faint. Apr 11, 2024 · Heat exposure can be a trigger for vasovagal syncope, especially in hot and humid environments. 20. Vasovagal syncope is the most common cause of fainting. It is the most common cause of fainting and occurs when the body's natural response to certain triggers results in reduced blood flow to the Dec 19, 2023 · Vasovagal syncope, which is a more common cause of passing out. syncope has the following features. R55 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Causes include: standing up too quickly – this could be a sign of low blood pressure; not eating or drinking enough; being too hot; being very upset, angry or in severe pain; heart problems; taking drugs or drinking too much alcohol; Symptoms of fainting. The sight of blood or a needle. That leads to reduced blood flow to your brain, causing you to briefly lose consciousness. May 1, 2024 · Vasovagal Reflex Syndrome, also known as vasovagal syncope, is a condition characterized by a sudden drop in heart rate and blood pressure, leading to fainting. The most common type of syncope is described as vasovagal syncope or ‘emotionally mediated fainting’. Similar episodes may be prevented by lying down. Apr 29, 2024 · What is vasovagal syncope? Vasovagal syncope is sudden fainting caused by a sudden drop in heart rate and blood pressure when your body overreacts to certain emotional or neurologic triggers. Typically, the inadequate cerebral nutrient flow is of relatively brief duration, and, by definition, syncope is self-limited. Oct 1, 2023 · What causes vasovagal syncope? Several triggers can cause vasovagal syncope. This response is mediated by the vagus nerve, which plays a crucial role in regulating heart rate and blood pressure. 3 Evidence from trials in patients with tilt-induced vasovagal syncope 1916 Nov 2, 2023 · Preventing Vasovagal Syncope. During a vasovagal syncope episode, an individual may experience dizziness, lightheadedness, nausea, sweating, and loss of consciousness. This allows blood to pool in your legs, which lowers your blood pressure. Nov 28, 2023 · What is syncope? Syncope is used to describe a loss of consciousness for a short period of time. The trigger causes the part of your nervous system that regulates heart rate and blood pressure to drop suddenly Oct 19, 2015 · Vasovagal syncope is a common cause of fainting, and now there is evidence that suggests simply sniffing and gasping can help people avoid the problem. Feb 4, 2022 · Vasovagal syncope is a benign condition caused by the activation of the parasympathetic nervous system in response to certain emotional or environmental triggers. Other Jul 28, 2021 · Neurocardiogenic syncope is the most common form of syncope. Unlike some other causes of fainting, vasovagal syncope does not signal an underlying problem with the heart or brain. Reflex syncope occurs in response to a trigger due to dysfunction of the heart rate and blood pressure regulating mechanism. This leads to dizziness, light-headedness, falls and blackouts. The What causes vasovagal syncope? Several triggers can cause vasovagal syncope. It can be divided into. Syncope. The Medical Definition of Vasovagal Syncope Vasovagal syncope is a form of reflex syncope, which means that it is triggered by certain stimuli. Some people may faint when having blood drawn at a doctor’s office or if they donate blood. Low-risk and younger people with vasovagal Situational vasovagal syncope is when a specific situation causes someone to faint. Vasovagal syncope happens when you have a sudden drop in blood pressure, which causes a drop in blood flow to your brain. The body’s response to heat can cause blood vessels to dilate, leading to a drop in blood pressure. "It's known as a simple fainting spell. It happens as a result of certain triggers. Apr 24, 2024 · Vasovagal syncope happens when you have a sudden drop in blood pressure. Straining during a bowel movement, stress, seeing blood, and standing for a long time are common triggers. Cardiac syncope occurs when the heart is not pumping enough blood to the brain. This type of fainting is not caused by any problem with the heart’s structure or rhythm. It occurs when there is a sudden drop in blood pressure and heart rate, leading to a temporary lack of blood flow to the brain. the loss of consciousness is of short duration. [2] Jul 12, 2023 · Syncope occurs when the blood flow to the brain becomes markedly reduced, for as few as five or six seconds. Fatigue or exhaustion. Situational syncope, or a sudden reflex response to a trigger other than those listed above, such as: Coughing, sneezing, laughing, swallowing. cardiac syncope. Mar 11, 2022 · Vasovagal syncope episodes cause a rapid drop in heart rate and blood pressure due to autonomic dysfunction, resulting in decreased blood flow to the brain and fainting. In this article, we will explore the various triggers of vasovagal syncope, the role of the autonomic nervous system, the diagnosis and identification of triggers, management and prevention Syncope and collapse. (Lay down and elevate legs on pillow). Fortunately, in most cases, syncope is a transient condition that is not caused by a serious medical problem. It is a benign condition. Jun 19, 2022 · Stress, anxiety or emotional upset. May 6, 2024 · Vasovagal Convulsive Syncope is a type of fainting episode that occurs due to the body’s excessive response to certain triggers. 5 The most common May 6, 2024 · Vasovagal syncope is the medical name for the condition where individuals faint due to a bodily overreaction to certain triggers. Vasovagal syncope is a common condition that causes fainting or loss of consciousness. Understanding Vasovagal Syncope. 3. The mechanism of vasovagal syncope is explained by the Bezold–Jarisch reflex, which is triggered due to decreased venous return resulting in inadequate Dec 17, 2021 · Definition. recovery is complete and spontaneous. Two of the most common triggers are extreme emotional distress or May 4, 2024 · May 4, 2024. While recurrent syncope can cause very impaired quality of life, the spells are not generally life-threatening. It happens when the vagus nerve is overstimulated, causing blood pressure to drop suddenly. Both non-pharmacological and pharmacological approaches can be used to treat patients. there are 3 types of syncope. Rapunzel10. Syncope precipitated by unpleasant physical or emotional stimuli (eg, pain, fright), usually occurring in the upright position and often preceded by vagally mediated warning symptoms (eg, nausea, weakness, yawning, apprehension, blurred vision, diaphoresis), suggests vasovagal syncope. The brain's blood flow can be interrupted for a number of different reasons. Apr 26, 2023 · Vasovagal syncope is a sudden drop in blood pressure and heart rate that leads to fainting or loss of consciousness. Over-exertion, even just from standing too long, can be enough to cause a person to pass out. 6. Jun 29, 2022 · Types of reflex syncope include vasovagal syncope (eg, cough syncope, deglutition syncope, and others), situational syncope, carotid sinus syncope, and some cases without apparent triggers . Nov 16, 2022 · Syncope is common, and older adults are at greater risk of hospitalization and death. Normally, when you stand up, gravity makes blood settle in the lower part of your body, below your diaphragm. A 1-min segment of a tilt-table test with a typical vasovagal syncope is shown of a 40-year-old man. Jan 2, 2024 · Vasovagal syncope — The most common type of syncope in all age groups, but especially in young people, is called vasovagal syncope. Causes of syncope. Mar 2, 2023 · In most cases of vasovagal syncope, treatment is unnecessary. Nov 3, 2022 · Vasovagal syncope causes. Other Sometimes having something cold to lay on helps, so either on the bare floor, or with an ice pack wherever i am. Vasovagal syncope occurs when the part of your nervous system that regulates heart rate and blood pressure malfunctions in response to a trigger, such as the sight of blood. Urinating. VVS is the most common form of syncope, and although usually harmless, its frequent occurrence adversely affects quality of life and increase the risk of adverse events [1]. Skipping meals. 5. Fainting usually Mar 2, 2023 · Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. Typical triggers include: Prolonged standing; Emotional stress; Pain Jan 2, 2024 · Vasovagal syncope — The most common type of syncope in all age groups, but especially in young people, is called vasovagal syncope. 3. Etiology. There are many reasons why someone might faint. It affects 3% of men and 3. Vasovagal syncope is fainting caused by a complex nerve and blood vessel reaction in the body. Apr 18, 2022 · Vasovagal syncope, sometimes called a vasovagal response, is fainting that occurs when the brain experiences a sudden reduction in blood flow due to a drop in heart rate and blood pressure. Causes. Vasovagal syncope is by far the most common type of a group of conditions called reflex syncope. It can occur due to extreme emotional distress, prolonged standing, heat, bearing down when using the toilet, or the sight of blood for some people. 703 Syncope during exercise is associated with increased probability of cardiac causes of syncope . May 23, 2023 · Vasovagal syncope is fainting that occurs in response to a sudden drop in blood pressure or heart rate. May 6, 2020 · Vasovagal syncope (VVS) is the most frequently encountered form of reflex syncope, and is the most common cause of syncope across all age groups (1, 2). ” The most common causes include stress from fear or While the exact causes of vasovagal syncope can vary from person to person, understanding the triggers can help individuals manage and prevent episodes. These symptoms correlate with increased vagal tone (increased signal in the vagus nerve supplying the heart), which acts to momentarily slow the heart and/or dilate (widen) the blood May 15, 2024 · In the case of vasovagal syncope, a trigger such as emotional distress or pain activates the vagus nerve, which plays a crucial role in regulating heart rate and blood pressure. Prolonged exercise. Some people who experience these episodes often can identify the preceding symptoms and take necessary measures such as lying down, which can prevent a fainting episode because it helps blood get to the brain, and ensures if the person does faint, he does not hurt him. A selection of EEG channels is shown. 7% of patients with unidentified causes of syncope were followed up. Pressure on the chest after exertion or exercise. During pregnancy, changing hormone levels cause blood vessels to relax and get wider, allowing more blood to flow to the baby. This causes your blood pressure to drop suddenly and sometimes your heart rate can slow. or. Vasovagal syncope can occur at any age, and occurs in people with and without other medical problems (2). Learn more about this condition, including common triggers and treatment options, with GoodRx. Aug 7, 2020 · What causes vasovagal syncope? Several triggers can cause vasovagal syncope, but it can affect men and women differently. It is caused by blood pooling in the legs, for example, after standing for long periods. It’s the most common cause of fainting. Younger people without cardiac disease but who've experienced syncope while standing or have specific stress or situational triggers aren't as likely to experience cardiac syncope. This can occur because of an abnormal heart rhythm that is Causes. Vasovagal syncope, also known as neurocardiogenic syncope or simply “fainting,” is a common disorder characterized by a sudden loss of consciousness and muscle tone, typically followed by a rapid recovery. However, if you experience vasovagal syncope often enough to interfere with your quality of life, your doctor may suggest trying one or more of the following remedies: Medications. Vision décolorée : Ce phénomène est également appelé « grisage », ce qui signifie que la vision disparaît, à l'exception d'une petite zone située directement devant vous. Sep 28, 2021 · Risk factors for cardiogenic syncope included age ≥60, male, hypertension, palpitation, troponin T‐positive, abnormal ECG, heart family history, and syncope‐related trauma. reflex, orthostatic, and cardiac. While this is a normal part of pregnancy, it can also lower your blood pressure, which can reduce the flow of blood to your brain and cause Jul 5, 2022 · Syncope is a clinical syndrome in which transient loss of consciousness (TLOC) is caused by a period of inadequate cerebral blood flow and oxygenation, most often the result of an abrupt drop of systemic blood pressure. Vasovagal syncope is by far the most common type of syncope across all age groups. While most syncopal events are innocuous, cardiac syncope is often indicative of a potentially fatal, underlying disease process, carrying a one-year mortality rate of 30%. Sometimes, if a person has prolonged vasovagal syncope, it can trigger a seizure. Cardiologists working in a syncope clinic or in a tilt table laboratory quickly realize that there are other causes for syncope and presyncope, including neurogenic orthostatic hypotension (nOH) and postural tachycardia syndrome. Les symptômes liés à la vision de la syncope vasovagale comprennent : Pupilles dilatées. The main causes of syncope are 'reflexes' (neurally mediated) such as vasovagal, situational syncope, or carotid sinus syndrome; orthostatic hypotension (OH); and cardiac syncope. Other Mar 30, 2019 · Vasovagal syncope is the common faint that may be experienced by normal persons with no evidence of heart disease. hypoperfusion. While not a severe problem, we know that After these potentially lethal causes of syncope have been excluded, most cases are ascribed to vasovagal syncope (VVS). It is caused by the sudden drop in heart rate and blood pressure, leading to a temporary reduction in blood flow to the brain. For instance, the sight of blood, stress, severe pain, or intense emotions and phobias. Although, fainting poses a risk of trauma. A thorough history, differentiating syncope occurring during exercise from syncope Apr 10, 2023 · Causes of syncope range widely, including vasovagal, neurologic, metabolic, pulmonary, volume depletion, and cardiac. Vasovagal syncope occurs when the regulation of blood pressure and heart rate are disturbed in response to a trigger such as sight of blood, extreme emotional feelings. While vasovagal syncope is typically harmless, it can be accompanied by various symptoms, including diarrhea. The most common cause of syncope during childhood is vasovagal syncope or neurocardiogenic syncope. This problem is caused by: Changes in the normal involuntary (autonomic) reflex. There is no evidence in humans for an active neurally mediated vasodilatation, although there may be an element of reactive hyperaemia as an Jan 10, 2022 · Vasovagal syncope is a common cause of fainting. Vasovagal syncope (uncomplicated 'faint') [Brignole, 2018a] Suspect if no features to suggest an alternative diagnosis, and the 3 'P's are present: Posture — typically after prolonged standing; less common after sitting. Understanding these causes can shed light on potential triggers and aid in managing the May 13, 2024 · Environmental triggers commonly associated with vasovagal syncope include standing for long periods, sudden changes in position, crowded or hot environments, and experiencing pain or fear. It may also be called neurocardiogenic syncope. Your doctor may help you identify your fainting triggers and discuss ways you might avoid them. A loss of consciousness occurs due to reduced blood flow to the brain. A thorough history, differentiating syncope occurring during exercise from syncope Nervous system-related causes of syncope include: Vasovagal syncope- The vagus nerve helps to regulate the tension in the blood vessels against which the heart beats. This is the American ICD-10-CM version of R55 - other international versions of ICD-10 R55 may differ. Oct 24, 2023 · What Causes Vasovagal Syncope? Vasovagal syncope happens when something triggers the vasovagal reflex, which causes blood vessels to widen (dilate) suddenly. It can happen when there is a sudden change in the blood flow to the brain. Syncope is more common as you get older, affecting up to 6% of people over age 75. Vasovagal. Standing for long periods, such as during a concert or a long queue, can lead to a decrease in blood flow to the brain, resulting in vasovagal syncope. The patient was tilted back during asystole (not indicated). It doesn’t necessarily happen every time and there are some factors that could contribute to it being more likely to happen, like being dehydrated and Dec 8, 2014 · The neuromediated syncope is called situational syncope when it occurs in conditions that trigger the Valsalva maneuver, such as urination, defecation, coughing, visceral pain, carry weight. Two main types of reflex syncope are similar to vasovagal syncope. Vasovagal syncope is the most common form. Vasovagal syncope is usually harmless and requires no treatment. Conservative management with education, exercise and physical Dec 16, 2023 · Syncope is a sudden, transient loss of consciousness, which is thought to be secondary to cerebral. 2 Evidence from trials in patients with carotid sinus syndrome 1915 5. Unlike other causes of fainting, it's not a sign of a problem with the heart or brain. A variety of conditions can trigger vasovagal syncope, including physical or psychological stress, dehydration Apr 2, 2019 · A condition known as vasovagal syncope, sometimes called “neurocardiogenic syncope,” occurs when you faint as a result of your body overreacting to certain triggers, such as the sight of blood or extreme emotional distress. arrhythmias. May 20, 2024 · Fear of blood, needles, and other medical tools (like a scalpel) are common triggers. transient loss of consciousness secondary to poor cerebral nutrient flow. Pfahnl said. These account for more than 90% of fainting in childhood. Although the clinical importance of VVS has been widely acknowledged for more than a century, and despite considerable investigational effort, its pathophysiology remains incompletely understood. The disorder is also known as neurocardiogenic syncope. , e. Mar 20, 2012 · Vasovagal Syncope: Syncope is suspected to occur secondary to efferent vasodepressor reflexes by a number of mechanisms; decreased peripheral vascular resistance ensues. Non-syncopal causes of blackout include epilepsy or seizure, and psychogenic pseudosyncope or non-epileptic seizures. (potentially life-threatening), and noncardiac syncope, which includes frequently benign causes such as reflex syncope (due to. It is important for individuals with vasovagal syncope to avoid prolonged exposure to heat and stay in cool environments to prevent syncope episodes. It leads to disruptions in blood pressure, heart rate, hormone release, and/or breathing. It can be related to a trigger, such as an emotional state, but it may also have another cause. 5 This type of syncope is not life threatening and occurs sporadically. It's the result of an abnormal reflex in the body and is often called reflex syncope. Weight lifting. “Once diagnosed, women seem to have more frequent episodes than men as well. Vasovagal syncope is classically triggered by pain, medical procedures, prolonged standing, or hot or crowded surroundings 24,25 but frequently occurs without an obvious trigger. Candidate Genes and Serotonin Model. Syncope during cough, micturition, defecation, or swallowing suggests situational syncope, while shaving or neck extension suggests carotid sinus syndrome. Other emotional causes include fear of heights, being exposed to a traumatic event, and fear of injury. This article will explain your body's vasovagal Oct 9, 2019 · There are three kinds of reflex syncope: Vasovagal: This happens when your body overreacts to a trigger. It most often affects children and young adults, but it can happen at any age. Raising your legs above your head also helps get blood flow back to your head. Individuals with vasovagal syncope may experience a high degree of stress and anxiety, which can trigger fainting. The 2024 edition of ICD-10-CM R55 became effective on October 1, 2023. 2. The fainting episodes are often accompanied by sweating, nausea or even vomiting," explains Minh Nghi, DO, an Causes of fainting. Discover the causes of vasovagal syncope and what treatment options are available. As a result, you feel lightheaded, nauseous, and sweaty and may even faint ( vasovagal syncope ). No nitro-glycerine was used. Mar 19, 2018 · 5. A variety of conditions can trigger vasovagal syncope, including physical or psychological stress, dehydration Vasovagal syncope is quite common. The vasovagal syncope trigger causes your heart rate and blood pressure to drop suddenly. The activation of the vagus nerve causes a sudden drop in blood pressure and leads to the symptoms experienced during an episode. . g. Excess heat. Unlike other causes of fainting, it’s not a sign of a problem with the heart or brain. Vasovagal syncope (VVS) is a common disorder of the autonomic nervous system. Vasovagal syncope is due to changes within the body’s nervous system, blood vessels, and heart, with not enough blood going to the brain This is also referred to as neurocardiogenic syncope, or the common faint. Triggering of the cardiovascular reflexes… Vasovagal syncope is a condition characterized by a sudden, temporary loss of consciousness due to a drop in blood pressure and heart rate, often triggered by emotional stress, pain, or prolonged standing. Mar 2, 2023 · Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. Intense pain. Vision floue. It’s typically caused by triggers, like the sight of blood or an intense emotion like fear or fright. Having a bowel movement. Neurally mediated, or vasovagal, syncope is characterised by an abrupt fall in blood pressure resulting from widespread vasodilatation caused by a sudden cessation of sympathetic vasoconstrictor activity. It occurs due to a sudden drop in heart rate and blood pressure, which leads to a temporary loss of consciousness. Syncope occurring in the athlete is predominantly of vasovagal origin, but underlying cardiac conditions may place athletes at undue risk for adverse events. “Women tend to have more symptoms and different triggers than men,” Dr. Typically, vasovagal syncope episodes occur after standing for a prolonged period of time; they can be triggered by fasting, dehydration, being in crowded or excessively warm Vasovagal syncope is quite common. Oct 10, 2019 · Vasovagal syncope is the most common cause of fainting. It happens to men and women in about equal numbers. In a moment of heightened emotional stress or excitement, the nervous system may stimulate the heart to beat very fast for a short time, leading to a temporary state of Jan 2, 2024 · The semiology of syncope also guides physicians in understanding the possible mechanisms underlying the syncope event (for example, vasovagal reflex, orthostatic hypotension or cardiac causes of What is vasovagal syncope ? This is the medical term for the simple faint and is a benign condition. These findings support a model in which serotonin binding to post-synaptic 5HT1A receptors causes vasovagal syncope by inducing hypotension and bradycardia (40, 41). Vasovagal syncope (VVS), also known as neurocardiogenic or reflex syncope, is caused by a sudden drop in blood pressure, often triggered by a reaction to something. Your heart rate slows, and the blood vessels in your legs widen (dilate). Jan 21, 2024 · Vasovagal syncope occurs due to the body’s overreaction to certain triggers, resulting in a sudden drop in blood pressure and a decrease in heart rate. 1 Evidence from trials in suspected or certain reflex syncope and electrocardiogram- documented asystole 1915 5. Dilation of the blood vessels causes a lot of the blood in the body to pool in the legs. In optometry , this typically occurs after the instillation of eye drops or during applanation tonometry. Finger blood pressure was recorded continuously using a Finometer. Strong emotions, especially overwhelming ones, can cause a person to pass out from vasovagal syncope. Vasovagal syncope is a type of fainting that occurs as a result of a specific set of triggers. These triggers can vary from person to person and may include factors such as standing for long periods, pain, emotional stress, or even certain smells. structural heart disease. Dec 3, 2015 · Vasovagal syncope occurs when a person’s body overreacts to certain triggers. It's the most common cause of fainting. xn nj ug al xn zd nu kb md oa