24 Hour ambulatory blood pressure monitoring (ABPM)

Ambulatory Blood Pressure Monitoring (ABPM) for hypertension, is when your blood pressure is being measured as you move around, living your normal daily life. It is normally carried over 24 hours. It uses a small digital blood pressure machine that is attached to a belt around your body and which is connected to a cuff around your upper arm. It small enough that you can go about your normal daily life and even sleep with it on.  If you want more information about this test contact me.

 

Why might I need a 24-hour monitor?

By measuring your blood pressure at regular intervals over 24 hours, your healthcare professional is able to get clear pictures of how your blood pressure changes throughout the day. There are a number of reasons why your healthcare professional might suggest this test:

  • They may want to find out if your high blood pressure readings in the clinic are much higher than they are away from the clinic (called the “white coat effect”).

  • They may want to see how well your medicines are working, to make sure they are controlling your blood pressure through the day.

  • They may want to see if your blood pressure stays high at night. If this is the case, they may need to change or adjust your medicines.


What happens during 24-hour blood pressure monitoring?

Normally the monitor is fitted at your local clinic, although some GP surgeries may have their own.

A 24-hour blood pressure measurement is just the same as a normal blood pressure check: a digital monitor takes your blood pressure by inflating a cuff around your upper arm and then slowly releasing the pressure. The device is small enough to be worn on a belt on your waist while the cuff stays on your upper arm for the full 24 hours.

The device then takes blood pressure readings at regular intervals throughout the day: usually, every 5-30 minutes during the daytime and 30-60 minutes at night. You will need to keep the monitor on through the night – you could put the device under the pillow or on the bed while you sleep.

Because the test is being carried out to find out what your normal daily blood pressure is, it is important to carry on with your normal routine and do all the things you would normally do. The only things you should avoid doing for the day are swimming and having a bath or shower (the device is not waterproof).

At the end of the 24 hours you can remove the device and cuff and give it back to the clinic or surgery. The machine will have stored all your readings and these will then be downloaded and analysed.

What do I need to do during 24-hour blood pressure monitoring?

To allow the device to work properly, it is important to make sure that the tube to the device is not twisted or bent. Also, just before the device is about to take a reading, it will beep. When this you hear the beep, you should:

  • sit down, if possible 

  • keep the cuff at the same level as your heart

  • keep your arm steady.

 

You will also be asked to keep a diary of what you were doing just before the reading was taken, what time you went bed and got up and if and when you took medications. Some people find 24-hour ABPM distracting and uncomfortable: if you feel like this when the readings are being taken, speak your healthcare professional as it may affect your reading.

 

If you want to have this test please contact me for more information. I also recommend reading about White coat hypertension and the white coat effect

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