Hypotension is physiologically and medically defined as abnormally low blood pressure. Hypotension is better described as a physiological condition than a medical condition. It is generally associated with shock, even though it is not explicitly stated. Hypotension must be separated from hypertension because in hypertension the blood pressure is elevated, whereas in hypotension it is the opposite. Natural physiology Blood pressure is constantly regulated by the body’s autonomic nervous system, which uses fine sensors, nerves and hormones to balance the sympathetic nerves, which tend to raise blood pressure, and the parasympathetic nerves, which tend to lower it. The large and frequent regulation of the autonomic nervous system is able to maintain a blood pressure that is tolerant of different types of activity and disease states. Causes and Structure Hypovolemia is the most common cause of hypotension. This can be due to bleeding or blood loss, inadequate fluid intake during starvation, or excessive loss of fluid such as dysentery or vomiting. Hypovolemia is often triggered by the use of diuretics, for example, and can also be caused by the use of different medications. Despite a positive blood volume, a decrease in cardiac output due to severe congestive heart failure, major myocardial infarction, or bradycardia can also cause hypotension, which can progress rapidly to shock. Arrhythmias also frequently cause hypotension. Beta sympathetic blockers can also cause hypotension by decreasing the heart rate and reducing the ability of the heart muscle to supply blood. Decreased sympathetic output or parasympathetic activation due to brain or spinal cord damage or autonomic dysregulation can lead to excessive vasodilation or insufficient vascular resistance, resulting in hypotension. Other causes of excessive vasodilation are sepsis, acidosis, or the use of drugs such as calcium blockers or angiotensin-converting enzyme inhibitors. Many anesthetic drugs and techniques, including spinal anesthesia and most inhalational anesthesia, cause significant vasodilation. Postural hypotension, also known as postural hypotension, is a common form of hypotension. It occurs with a change in body position, especially from a sitting or lying position to an upright position. It is usually a temporary hypotension, due to a delay in the normal regulation of the autonomic nervous system. It can occur with low blood volume. This side effect can occur when different medications are used, especially those mentioned above that lower blood pressure or psychiatric medications such as antidepressants. Postural hypotension can be determined by simply measuring blood pressure and heart rate while lying down, sitting, or standing. Neurocardiogenic syncope is a form of dysautonomia, particularly when there is an abnormal drop in blood pressure in the upright position. The tilt test can be used to test for this condition. Neurocardiogenic syncope is associated with vasovagal syncope, as both are caused by increased vagal activity of the parasympathetic nerves. Another less common type is postprandial hypotension, which occurs 30-75 minutes after a meal. Since a large amount of blood is sent to the small intestine during digestion, the body must increase the heart rate and vasodilation to counteract the local change in blood volume. It is generally believed that this form of hypotension is caused by dysregulation or failure of the autonomic nervous system to make proper adjustments as it ages. Nutritional principles of low blood pressure recipes 1, diet should pay attention to nutrition, it is appropriate to eat high protein, high calorie, high vitamin food, especially the weak, more to ensure the intake of adequate nutrition. 2, appropriate to increase the amount of salt, while drinking more water, more water into the blood can increase the blood volume, which can improve blood pressure. Indicators For most people, a healthy blood pressure is between 115/75 mm Hg. A small drop in blood pressure, albeit as little as 20 mm Hg, will result in a brief period of hypotension. Signs The main signs of hypotension are dizziness and general weakness. If the blood pressure falls to a certain level, fainting or even seizures may occur. Hypotension usually has the following symptoms, but they are more related to the cause of the hypotension than to the effects of the hypotension itself.