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What Are The Causes Of Low Blood Pressure

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What Causes Low Blood Pressure

The NHLBI is part of the U.S. Department of Health and Human Services National Institutes of Health the Nations biomedical research agency that makes important scientific discovery to improve health and save lives. We are committed to advancing science and translating discoveries into clinical practice to promote the prevention and treatment of heart, lung, blood, and sleep disorders, including problems associated with low blood pressure. Learn about current and future NHLBI efforts to improve health through research and scientific discovery.

What Is Blood Pressure

As blood pumps through the circulatory system, it pushes against the walls of the arteries and veins. Blood pressure is the force of the blood as it presses against the blood vessel walls. It is measured in systolic pressure and diastolic pressure .

Blood pressure rises and falls throughout the day. Normal blood pressure is considered to be below 120/80 mm Hg. In a blood pressure reading, the top number refers to systolic pressure, and the bottom number refers to the diastolic pressure.

Stroke And Brain Problems

High blood pressure can cause the arteries that supply blood and oxygen to the brain to burst or be blocked, causing a stroke. Brain cells die during a;stroke;because they do not get enough oxygen. Stroke can cause serious disabilities in speech, movement, and other basic activities. A stroke can also kill you.

Having high blood pressure, especially in midlife, is linked to having poorer cognitive function and dementia later in life. Learn more about the link between high blood pressure and dementia from the National Institutes of Healths Mind Your Risks®external icon;campaign.

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Heat Exhaustion Or Stroke

Heat exhaustion occurs when a person is out in the sun or in high temperatures for too long. It usually goes hand-in-hand with dehydration and has many of the same symptoms. If left untreated, heat exhaustion can progress to heat stroke, which can cause damage to the vital organs. Like dehydration, you may feel dizzy, disoriented, or faint; this is because the body cannot efficiently send blood to your organs.

Baroreceptor Signals Sent To The Kidneys

Low Blood Pressure Cause

Kidneys participate in blood pressure control by regulating urine production. When kidneys pull more water out of the blood, blood pressure decreases. When the kidneys decrease urine output, water remains in the blood and blood pressure increases. The action of the kidneys on blood pressure is slow — acting over hours to days — compared to baroreceptor control and other systems that influence blood pressure very quickly.

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Diet For Low Blood Pressure In Teens

Sometimes, blood pressure drops due to the poor supply of essential nutrients in the body. A balanced diet can help replenish these nutrients and elevate the blood pressure level.

  • Include vitamin B12-rich foods such as eggs and fortified cereals as they help prevent anemia. Eat egg in boiled or scrambled form.
  • Foods such as asparagus and broccoli that are rich in folic acid also help in keeping anemia at bay .
  • Teenage girls should take iron-rich foods like green leafy vegetables, beans, and lentils to compensate for the blood loss during menstruation.

The best way to deal with hypotension in teens is to follow a healthy lifestyle of a balanced diet and physical activity. Also, adequate rest and proper intake of fluids can keep low blood pressure at bay. If these changes do not help, you should consult your doctor for advice on how to manage the condition better.

Do you have any experiences to share about hypotension in teens? Share it with us in the comments section.

References:

Low Blood Pressure In Teens: Causes Symptoms And Treatment

Periodic lightheadedness and seeing of black spots while standing is common in an otherwise healthy teenager . This could be due to a drop in blood pressure, also known as hypotension. Low blood pressure in teens is not bothersome unless the fainting spells become frequent.

Here, MomJunction tells you about the reasons for low blood pressure in teenagers, its symptoms, and preventive measures to be taken.

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Monitoring And Controlling Blood Pressure

Baroreceptors are specialized cells located within arteries that act as blood pressure sensors. Those in the large arteries of the neck and chest are particularly important. When baroreceptors detect a change in blood pressure, they trigger the body to react to maintain a steady blood pressure. Nerves carry signals from these sensors and the brain to

  • The heart, which is signaled to change the rate and force of heartbeats . This change is one of the first, and it corrects low blood pressure quickly.

  • The arterioles, which are signaled to constrict or dilate .

  • The veins, which are signaled to constrict or dilate .

  • The kidneys, which are signaled to change the amount of fluid excreted and to change the amount of hormones that they produce . This change takes a long time to produce results and thus is the slowest mechanism for how the body controls blood pressure.

Nonetheless, the ways that the body can monitor and control blood pressure have limitations. For example, if a person loses a lot of blood quickly, the body cannot compensate quickly enough, blood pressure falls, and organs may begin to malfunction .

In addition, as people age, the body responds to changes in blood pressure more slowly.

How Is Low Blood Pressure Diagnosed

What is Hypotension (Low Blood Pressure)? | Ausmed Explains…

Your doctor will ask about your symptoms and take your blood pressure by placing a blood pressure cuff around your upper arm. The cuff will tighten on your arm, and the monitor will measure your systolic and diastolic pressure. A blood pressure reading of 90/60 mm Hg is considered low blood pressure.

Low blood pressure may be a sign of an underlying condition, so your doctor will try to determine what caused your blood pressure to drop. Depending on your medical history and symptoms, your doctor may also check your heart using an echocardiogram, electrocardiogram, or stress test. Your doctor may also perform blood tests to check for:

  • Hormonal imbalances.

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Treatment For High Pulse

Treatment for high pulse will vary according to a range of factors.

It is helpful to try to identify when the pulse first began to rise. Some episodes of a high pulse may be temporary. For example, if a person develops a high pulse after moving from a prone to a standing position too quickly, the heart might beat more quickly to compensate for gravitys effects.

People who experience bouts of low blood pressure or high pulse while moving from a prone to standing position could try to slow down these movements to help avoid the issue.

Exercising may also lead to a high heart rate, especially if a person is not very fit. This is because the heart may start beating faster even after a person attempts minor exercise.

If a person notices that their heart is beating faster, finding ways to calm the body and brain may help. A person can try slowing down their breathing rate or practicing guided meditations to help them relax and reduce heart rate.

If the heart rate does not go back to normal or if a person is worried, contact a doctor for a full diagnosis.

Frequently Asked Questions About Low Blood Pressure

  • Isn’t it good to have low blood pressure?Isn’t it good to have low blood pressure?

    As long as its not causing any problems, the lower your blood pressure, generally the better. High blood pressure;is a risk to your health it can lead to serious conditions such as stroke, coronary heart disease and kidney failure. The lower your blood pressure, the less likely you are to suffer from these problems.

    However, if your blood pressure becomes lower than usual for you, it can cause problems. If you have any symptoms like feeling dizzy or faint, you should contact your doctor. See the symptoms sections above for more information.

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What Are The Side Effects Of The Treatment For Low Blood Pressure

There are no side effects for the lifestyle and dietary changes that can treat hypotension.

The medications used to treat hypotension have several side effects, some of which may be serious. Fludrocortisone can make certain infections worse, so its essential to discuss this medication with your doctor. The most common side effects from fludrocortisone are:

  • Increased risk of infection.

The most common side effects from midodrine are:

  • Numbness or tingling.
  • Goosebumps and chills.

Serious Injuries And Shock

What are the Causes of Low Blood Pressure?

Low blood pressure can also be caused by serious injuries or burns, particularly if you have lost a lot of blood. This can mean that there is less blood being pumped around your body. Low blood pressure can also occur if you go into;shock after having a serious injury.

Other kinds of shock are described below.

Anaphylactic shock

Anaphylactic shock, or anaphylaxis, is caused by an allergic reaction to something – for example, a wasp sting or a peanut. During an allergic reaction, your body produces a large amount of a chemical called histamine, which causes your blood vessels to widen and leads to a sudden, severe drop in blood pressure.

Cardiogenic shock

Cardiogenic shock occurs when your heart cannot supply enough blood to your body, so your blood pressure drops. This can happen during a heart attack.

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Low Blood Pressure When You Stand Up

Sometimes, changes in your posture can cause your blood pressure to drop, for example, going from sitting or lying down to standing up. You might feel the symptoms listed above when you stand up, such as feeling dizzy or faint. They will pass quickly as your body adjusts, but can put you at risk of falls.

This is called postural hypotension or orthostatic hypotension. Its caused by changes to your arteries which happen as you get older and if youre taking medications to lower your blood pressure.;

The animation below provides;information on the causes, symptoms and potential interventions related to orthostatic hypotension.

This film was produced by;Newcastle University;for work completed by Dr James Frith, supported by the;NIHR Newcastle Biomedical Research Centre.;

Q What Can Cause Low Blood Pressure

  • Your blood pressure can vary throughout the day. It depends on your body position, breathing patterns, stress levels, physical activities, medications, what you eat or drink, and the time. Some of the main medical conditions that can cause low blood pressure are:
    • Pregnancy
    • Nutrition deficiency in the diet
    • Certain antidepressants

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    Why Is Hypertension An Important Issue In Low

    The prevalence of hypertension varies across regions and country income groups. The WHO African Region has the highest prevalence of hypertension while the WHO Region of the Americas has the lowest prevalence of hypertension .

    The number of adults with hypertension increased from 594 million in 1975 to 1.13 billion in 2015, with the increase seen largely in low- and middle-income countries. This increase is due mainly to a rise in hypertension risk factors in those populations.

    Medication Used To Treat Low Blood Pressure

    LOW Blood Pressure: Hidden Causes

    In cases of more severe or recurrent symptoms of low blood pressure, doctors may prescribe drugs to stabilize the system. These may include:

    Fludrocortisone: It is a steroid that is prescribed when the body is unable to produce enough by itself, and is often prescribed in conjunction with other steroids such as hydrocortisone. It reduces inflammation in the body and causes the body to retain more sodium. It may cause some water retention, but this is not a cause for concern since it is necessary to build blood pressure. To maintain the sodium-potassium balance, a doctor might recommend consumption of potassium-rich foods such as apricot, bananas, spinach and broccoli while on this prescription. Once the effects of low blood pressure are no longer witnessed, you may be asked to discontinue the steroid, while maintaining lifestyle and diet changes.

    Midodrine: A counter to blood vessel dilation, midodrine is a what is called a vasopressor and constricts small blood vessels to increase blood pressure. It is usually prescribed in cases of postural hypotension and the dosage is gradually increased over time to prevent side effects.

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    Should I Be Treated For Low Diastolic Blood Pressure

    Most people with low diastolic blood pressure do not display any signs and symptoms and, hence, do not require any treatments. However, for symptomatic people

    • Careful examination that includes anemia screening and cardiovascular assessment is required. If they have low blood pressure due to certain medications, a change in the type of medication or dosage is necessary. They need to control alcohol and other addictions.
    • Regular exercise is compulsory.
    • Some leg exercises are necessary if they get up from prolonged rest.
    • The intake of salt and water should be increased but not above 1,500 mg salt a day.
    • If the problem still persists, a detailed cardiovascular check with neuroendocrine assessment is required.;
    • There are certain medications such as fludrocortisone that may be prescribed in certain cases.

    How To Measure Heart Rate

    Measuring your heart rate is easy to do if you follow some simple steps. The easiest place to measure your heart rate is on your wrist, just below the base of the thumb. Place your index and middle fingers between the bone and tendon at the base of your thumb. Once you feel your pulse, count the number of beats you feel in 15 seconds. Once youve counted how many pulses, youll multiply that number by four. This gives you the total amount of times your heart beats in one minute. For example, if your heart beats 18 times in 15 seconds, your heart rate is 72 beats per minute.

    Its important to measure your heart rate when youre in a relaxed state. If you take your pulse after any strenuous activity, you wont get an accurate reading. You should wait for one to two hours after exercising to take your resting heart rate, and an hour after consuming caffeine, according to Harvard Health.

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    Problems With Heart Conduction

    A low pulse rate can sometimes be an indicator of a problem with the hearts electrical conduction pathway.

    The heart has an electrical system that travels in a distinct pattern to make the heart beat with a regular rhythm. If there is damage, scarring, or overstretching of the heart, the electrical system may not work as effectively. This can cause a low pulse rate.

    Chronic high blood pressure can contribute to damage to the electrical system that, in turn, leads to a low pulse rate. Other causes of damage include smoking, a history of heavy drug or alcohol use, or aging of the heart.

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    Diet And Nutrition For Low Blood Pressure

    causes low blood pressure

    A balanced meal with complex carbohydrates, fish, lean meat, fruits and cooked vegetables goes a long way in preventing hypotension. Changing meal patterns to make them more frequent and less heavy prevent as well as address postprandial fatigue and hypotension.

    On diagnosis of a dip in BP, a low blood pressure diet that supplies adequate sodium, and potassium while maintaining blood sugar levels is generally recommended for patients.Increased consumption of non-alcoholic beverages helps maintain adequate hydration and is recommended. Increasing salt quantities or addition of soy sauce in everyday cooking is a simple change that combats effects of low blood pressure and may be suggested by your doctor.

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    When Should You Call Your Doctor About Low Blood Pressure

    If you have recurring dizziness or fainting, or other symptoms of low blood pressure, you should visit your doctor. Sudden drops in blood pressure can be dangerous. It is important for your doctor to determine why your blood pressure is dropping and treat the cause.

    Last reviewed by a Cleveland Clinic medical professional on 10/08/2019.

    References

    What Are The Treatments For Low Blood Pressure

    The treatments for low blood pressure depend on what caused the condition. Your doctor will work with you to address the cause of the hypotension. In severe cases of hypotension, your doctor may give you IV fluids to raise your blood pressure.

    Depending on a variety of factors, such as your age and the type of hypotension, your doctor may recommend one or more of the following: dietary changes, lifestyle changes and/or medications.

    To make dietary changes, your doctor might tell you to:

    • Stay hydrated by drinking more water throughout the day.
    • Drink less alcohol.
    • Increase your salt intake slightly because sodium raises blood pressure.
    • Eat smaller, healthy meals and limit carbohydrates.

    You can take several steps to avoid a sudden drop in blood pressure. Your doctor may recommend that you make the following lifestyle changes:

    • Wear compression stockings.
    • Get up slowly after youve been sitting or lying down.
    • Avoid standing for long periods of time.
    • Sit up and breathe deeply for a few minutes before getting out of bed.

    Your doctor might prescribe medications like:

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    What Causes Low Blood Pressure With A High Heart Rate

    Written byMohan GarikiparithiPublished onOctober 24, 2017

    Having a condition characterized by low blood pressure and high heart rate may be cause for concern, prompting a visit to your local physician. Tachycardia, also known as a high heart rate, is a term used to refer to a pulse rate greater than 100 beats per minute and may be a reflex when the body senses a fall inblood pressure. This is generally considered a normal transient physiologic response that occurs to help correct an abnormality in blood pressure.

    However, there are pathological conditions causinglow blood pressureand high heart rate, such as when the neural connections between the heart and the brain become dysfunctional, often leading to fainting spells. This condition, as well as others, should be assessed by a trained physician to find the underlying cause.

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