Tilt table test
You begin by lying flat on a table. Straps are put around your body to hold you in place. After lying flat for a while, the table is tilted to raise your body and head — simulating a change in position from lying down to standing up. During this test, your heart rate and blood pressure are monitored to evaluate your body's cardiovascular response to the change in position.
Your doctor's goal in evaluating orthostatic hypotension is to find the cause and determine appropriate treatment. The cause isn't always known.
Your doctor may review your medical history and your symptoms and conduct a physical examination to help diagnose your condition.
Your doctor also may recommend one or more of the following:
- Blood pressure monitoring. Your doctor will measure your blood pressure both while you're sitting and while you're standing and will compare the measurements. Your doctor will diagnose orthostatic hypotension if you have a drop of 20 millimeters of mercury (mm Hg) in your systolic blood pressure or a drop of 10 mm Hg in your diastolic blood pressure within two to five minutes of standing, or if standing causes signs and symptoms.
- Blood tests. These can provide information about your overall health, including low blood sugar (hypoglycemia) or low red blood cell levels (anemia), both of which can cause low blood pressure.
Electrocardiogram (ECG or EKG). This noninvasive test detects irregularities in your heart rhythm or heart structure and problems with the supply of blood and oxygen to your heart muscle.
During this test, soft, sticky patches (electrodes) are attached to the skin of your chest, arms and legs. The patches detect your heart's electrical signals while a machine records them on graph paper or displays them on a screen.
Sometimes, heart rhythm abnormalities come and go, and an ECG won't find problems. If this happens, you may be asked to wear a 24-hour Holter monitor to record your heart's electrical activity as you go about your daily routine.
Echocardiogram. In this noninvasive exam, sound waves are used to produce a video image of your heart. Sound waves are directed at your heart from a wandlike device (transducer) that's held on your chest.
The sound waves that bounce off your heart are reflected through your chest wall and processed electronically to provide video images of your heart in motion to detect structural heart disease.
- Stress test. A stress test is performed while you're exercising, such as walking on a treadmill. Or you may be given medication to make your heart work harder if you're unable to exercise. Your heart is then monitored with electrocardiography, echocardiography or other tests.
- Tilt table test. A tilt table test evaluates how your body reacts to changes in position. You'll lie on a flat table that tilts to raise the upper part of your body, which simulates the movement from lying down to standing. Your blood pressure is taken frequently as the table is tilted.
- Valsalva maneuver. This noninvasive test checks the functioning of your autonomic nervous system by analyzing your heart rate and blood pressure after several cycles of a type of deep breathing: You breathe in deeply and push the air out through your lips, as if you were trying to blow up a stiff balloon.
Compression stockings, also called support stockings, compress your legs, promoting circulation. A stocking butler may help you put on the stockings.
The goal of treatment for orthostatic hypotension is to restore normal blood pressure. That usually involves increasing blood volume, reducing the pooling of blood in your lower legs and helping blood vessels to push blood throughout your body.
Treatment often addresses the cause — dehydration or heart failure, for example — rather than the low blood pressure itself.
For mild orthostatic hypotension, one of the simplest treatments is to sit or lie back down immediately after feeling lightheaded upon standing. Your symptoms should disappear.
When low blood pressure is caused by medications, treatment usually involves changing the dose of the medication or stopping it.
Orthostatic hypotension treatments include:
Lifestyle changes. Your doctor may suggest several lifestyle changes, including drinking enough water; drinking little to no alcohol; avoiding overheating; elevating the head of your bed; avoiding crossing your legs when sitting; and standing up slowly. Then pause briefly to be sure it's ok for you to start walking.
If you don't also have high blood pressure, your doctor might suggest increasing the amount of salt in your diet. If your blood pressure drops after eating, your doctor may recommend small, low-carbohydrate meals.
- Compression stockings. Compression stockings and garments or abdominal binders may help reduce the pooling of blood in your legs and reduce the symptoms of orthostatic hypotension.
Medications. A few drugs are used to treat orthostatic hypotension, including midodrine (Orvaten) and droxidopa (Northera). Side effects of midodrine can include retaining urine, tingling or itchy scalp, and goose-bumps. Side effects of droxidopa can include nausea, headache and bladder pain. With either drug, avoid lying flat for four hours after taking it to reduce the risk of high blood pressure while lying down.
Fludrocortisone is often used to help increase the amount of fluid in your blood, which raises blood pressure, but it can have serious side effects. If you take fludrocortisone, your doctor will monitor you for side effects.
Another medication is pyridostigmine (Mestinon, Regonol). This drug might be more effective combined with midodrine. Side effects can include abdominal cramps, nausea and diarrhea.
Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this disease.
Lifestyle and home remedies
Some simple steps help manage or prevent orthostatic hypotension. Your doctor may give you several suggestions, including:
- Increase salt in your diet. This must be done carefully and only after discussing it with your doctor. Too much salt can cause your blood pressure to increase beyond a healthy level, creating new health risks.
- Eat small meals. If your blood pressure drops after eating, your doctor may recommend small, low-carbohydrate meals.
- Ask about vitamin supplements. Both anemia and vitamin B-12 deficiency can affect blood flow and worsen symptoms of orthostatic hypotension, so iron and vitamin supplements might be helpful for you if you're deficient.
- Get plenty of fluids. Keeping hydrated helps prevent symptoms of low blood pressure. Drink plenty of water before long periods of standing, or any activities that tend to trigger your symptoms.
- Avoid alcohol. Alcohol can worsen orthostatic hypotension, so limit or avoid it completely.
- Exercise. Regular cardiovascular and strengthening exercises may help reduce symptoms of orthostatic hypotension. Avoid exercising in very hot, humid weather. Stretch and flex your calf muscles before sitting up. If symptoms strike, squeeze your thighs together as well as your abdominal and buttock muscles. Squat, march in place or rise onto your tiptoes.
- Avoid bending at the waist. If you drop something on the floor, squat with your knees to recover it.
- Wear waist-high compression stockings. These may help improve blood flow and reduce the symptoms of orthostatic hypotension. Wear them during the day, but take them off for bed and anytime you lie down.
- Get up slowly. You may be able to reduce the dizziness and lightheadedness that occur with orthostatic hypotension by moving slowly from a lying to standing position. Also, when getting out of bed, sit on the edge of your bed for a minute before standing.
- Raise your head in bed. Sleeping with the head of your bed slightly raised can help fight the effects of gravity.
- Move your legs while standing. If you begin to get symptoms while standing, cross your thighs in a scissors fashion and squeeze, or put one foot on a ledge or chair and lean as far forward as possible. These maneuvers encourage blood to flow from your legs to your heart.
Preparing for your appointment
No special preparations are necessary to have your blood pressure checked. But it's helpful if you wear a short-sleeved shirt or a loosefitting long-sleeved shirt that can be pushed up during your evaluation so that the blood pressure cuff can fit around your arm properly.
Take your blood pressure regularly at home, and keep a log of your readings. Bring the log with you to your doctor's appointment.
Take your blood pressure first thing in the morning. Lie down for the first reading. Complete taking your blood pressure, then wait one minute. Stand and take the second reading.
Also take your blood pressure at these times:
- After you eat
- When your symptoms are least severe
- When your symptoms are most severe
- When you take your blood pressure medications
- One hour after you take your blood pressure medications
Here's some information to help you get ready for your appointment.
What you can do
- Be aware of any pre-appointment restrictions. When you make the appointment, be sure to ask if there's anything you need to do in advance, such as restrict your diet for a blood test.
- Write down any symptoms you have, including any that may seem unrelated to low blood pressure, what triggers them and when they began.
- Write down key personal information, including a family history of low blood pressure and any major stresses or recent life changes.
- Make a list or bring bottles of all medications, vitamins or supplements you take because some medications — such as over-the-counter cold medicines, antidepressants, birth control pills and others — can affect your blood pressure. Don't stop taking any prescription medications that you think may affect your blood pressure without your doctor's advice.
- Take a family member or friend along, if possible. Sometimes it can be difficult to remember all the information provided to you during an appointment. Someone who accompanies you may remember something that you missed or forgot.
- Be prepared to discuss your diet and exercise habits, especially the amount of salt in your diet. If you don't already follow a diet or exercise routine, be ready to talk to your doctor about any challenges you might face in getting started.
- Write down questions to ask your doctor.
For hypostatic hypotension, questions to ask your doctor include:
- What's the most likely cause of my symptoms?
- Could my medications be a factor?
- What are other possible causes for my symptoms or condition?
- What tests will I need?
- What's the most appropriate treatment?
- How often should I be screened for low blood pressure? Should I measure it at home?
- I have other health conditions. How can I best manage these conditions together?
- Are there any dietary or activity restrictions that I need to follow?
- Are there any brochures or other printed material that I can have? What websites do you recommend?
Don't hesitate to ask other questions.
What to expect from your doctor
Your doctor will likely ask you questions, such as:
- How often do you have symptoms?
- How severe are your symptoms?
- What, if anything, seems to improve your symptoms?
- What, if anything, appears to worsen your symptoms?
- Do you ever temporarily stop taking your medications because of side effects or because of the expense?