How to Slow a Fast Heart Rate

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This survival-medicine website provides general information, not individual advice. Most scenarios assume the victim cannot get expert medical help. Please see the disclaimer.

How to Slow a Fast Heart Rate

In the photo, the carotid artery (red) runs up the neck between the Adam’s apple and the internal jugular vein (blue). This is good to know when you need to do the carotid maneuver. (See the post.)

by James Hubbard, MD, MPH

You’re in the middle of a disaster or on a long hike, and suddenly you feel a little faint. Or maybe you feel butterflies in your chest.

You check your pulse, and it’s going really fast. Since your pulse is an extension of your heart, that means you have a really fast heart rate also. What do you do?

Until you can get medical help:

1. Sit down if you can.

2. Check your pulse rate. (See the “Check Your Normal” insert below.) If it’s going at a speed of 100–110, and it’s at a regular rate (maybe a few skips) you could be just overtired or nervous. Sit or lie there for a few minutes and try to relax. Dehydration, fever, and anemia can cause the heart to beat fast like this also.

But …

If the heart rate is closer to 150 or higher, you’re probably in what we call supraventricular tachycardia (SVT). In SVT, your heart’s electrical system, which controls the heart rate, gets out of kilter. (See the insert about the electrical system below.) This can result in two things.

First, when the rate’s that fast, the heart can’t efficiently empty the blood from its chambers. Second, those chambers’ pumping rhythms can get out of sync. (Normally your atria pump blood to your ventricles, which pump it out milliseconds later. You can hear that when you listen through a stethoscope. Tadump, tadump. That system can get out of whack in SVT.)

The Heart’s Electrical System

Normally the heart rate is triggered at the “sinus,” or “sinoatrial,” node (1). The impulse then travels through the heart, syncing the beats of the four chambers (atria and ventricles). The sinus node knows when to speed up or slow down the rate if it thinks the body needs more or less blood to furnish its needs.

Sometimes, for various reasons, the “supraventricular node” (2) can take over. It will trigger the heart to beat around 150 times per minute (supraventricular tachycardia—SVT). This is an abnormal rate and always too fast.

Occasionally, the left ventricle (7) can take over the rate at around 300 beats per minute (ventricular tachycardia—VT). That rate is unsustainable for life. If VT happens, you can try a hard thump with your fist to the middle of the chest, or hope the vagal maneuvers work. Neither method works very often, and if you can’t make it to a medical facility quickly, you’re likely not to survive.

(Ignore the other numbers in the picture for our purposes.)

Any of this is a big stress on the heart. Your blood pressure may drop because your heart isn’t pumping blood out as efficiently. If you have underlying heart disease you could have a heart attack.

Causes for SVT include thyroid disease, prescription medications, smoking, anxiety, recreational drugs, and a condition called Wolff-Parkinson-White syndrome (a slight electrical system abnormality you’re born with). Often, though, the cause remains unknown.

 Get The Survival Doctor’s interactive guidebooks here. They do an anxious heart good.

3. If you think it’s SVT, get your heart rate down. Until you can get medical help there are a few things you can try to kick it back into a normal, safer, more-efficient rate. All of these stimulate your vagus nerve (which has direct connections to your heart) and help control the rhythm. After each “vagal maneuver,” check the pulse to see if your heart rate has slowed.

a. Valsalva maneuver.
Hold your breath and bear down in a strain (like if you’re constipated and straining to have a bowel movement). Do this for five seconds, then breathe. This changes the pressure in your chest and therefore in the big blood vessels in it. That fools your body into thinking your heart should slow down. If the pulse hasn’t slowed, try again. Another way to do the Valsalva maneuver is to stick a finger in your throat and gag yourself.

b. Carotid maneuver.
Find your carotid pulse (see top photo) just below your jaw. The vagus nerve runs next to it. Massage very firmly for five seconds. Warning: In rare cases this could knock off a piece of a blood clot lodged in this area and cause a stroke. Don’t do this in elderly people or anyone with a history of a stroke.

c. Ice-water facial.
A little odd, I know, but if you have cold water (preferably ice water,) dip your face in it a few seconds. This stimulates your vagus nerve to slow your heart by causing what’s known as the dive reflex. It’s the same reflex that helps some people survive for a long time under cold water by slowing the body’s metabolism down.


Whether or not one of these things works, or your heart rate converts back to normal on its own, get checked by a doc as soon as you can. SVT can also be prevented with prescriptions medicines.

Has anyone ever experienced a fast heart rate? What did you or the medical personnel do? How was it treated, or did it just go away?

This is where you find the radial pulse. Always use two fingers to feel for a pulse. It helps you make sure you’re not mistaking your own pulse in your finger for someone else’s.

Check Your Normal

Go ahead and check your pulse now. Yes, right now. If you know where to find it and what a normal pulse feels like, it’s going to be lot easier to check it when it’s abnormal. See the photos (right and top) to locate two of the most common areas.

Notice the regular rhythm, speed, and force of your normal pulse. If you have a watch, count the rate for ten seconds and multiply times six for the heart rate per minute. Or check the rate for fifteen seconds and multiply times four. The normal rate is 60–100 beats per minute. Some athletes may have slower normal rates because their heart pumps blood so efficiently.

Then check your pulse without counting to get a feel of what a normal rate is so that if you don’t have a watch when you need it, you can discern when it’s beating way too fast.

One trick of estimating the rate is to take it to the beat of the song “Stayin’ Alive” (or “Another One Bites the Dust”). Both tunes are at 100 beats per minute.

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Carotid artery photo by Shannan Muskopf on Flickr. Illustration of the heart’s electrical system by J. Heuser, based on an illustration by Patrick J. Lynch, illustrator, and C. Carl Jaffe, MD, cardiologist, Yale University Center for Advanced Instructional Media. The illustration (only) is licensed under the Creative Commons Attribution 2.5 Generic license.

  • Jes

    I’m joining the navy, but when I got my physical my pulse was 117 so they disqualify me and told me to go to the navy reserve to check my pulse again, funny because when I’m in my house, store, with friends my pulse is about 80-90 and every time I go to the base to check the pulse it goes up to 110 -100

    • James Hubbard, MD, MPH

      Some people’s blood pressure goes up only when they’re at the doctor’s office. The same thing could happen with the pulse. However, perhaps you should see a doctor and make sure nothing’s wrong. If not, you could try getting more exercise (which brings the pulse down) and try relaxation and breathing techniques to use when you’re getting it checked on the base.

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  • Jacques

    Hi Doc, thanks for this site. My wife’s heart rate was 171 for over an hour. I came upon your website and used your method and it worked. Thanks very much once again.

    • James Hubbard, MD, MPH

      Jacques, that’s great. But, still, she needs to have a good checkup.

      • Jacques

        We will definitely do that, thanks.

  • Dustin

    Good Afternoon,

    Thank you for the tips. I sometimes at work will get a heart rate of 100-120 and very little i do can lower it…when I’m at home i can normally bring it down to around 75-85. my normal is right around 80. Sometimes even when I do these tricks (cant do the ice water thing as im at work) my heart rate increases (especially during the holding your breath one). Any advice?

    • James Hubbard, MD, MPH

      In general, a heart rate in the 100-120 range could just be normal reaction to strenuous exercise. It would be sinus tachycardia and wouldn’t be slowed by anything (and shouldn’t) other than rest. On the other hand, having a heart rate above 100 and fully rested, could mean something like anemia, thyroid problems, anxiety, medications, and many other things, and would need to be checked out, find the reason, and treat the reason. Sinus tachycardia won’t respond to vagal maneuvers including ice water.

  • Humna khan

    My normal heart rate is 105-110. My heart beats weird when I’m in stress . almost 150 times per minutes .. and later I cry. don’t know what to do. perhaps I would some day commit suicide because of that.

    • James Hubbard, MD, MPH

      Please see a doctor. Make an appointment today. Tell the doctor your problems and all your concerns including your stress and the thoughts of suicide. Please don’t put off going to the doctor.

      • Humna khan

        No I can’t see a doctor. Thanks for Advice. I wanna know which kind of disease is this. Will I die soon if I don’t see a doctor? what if I work out. will it lower my heart rate. I badly want to live a normal life but it seems impossible.

        • James Hubbard, MD, MPH

          I’m sorry, but I couldn’t possibly know that. it could be anything for hyperventilation to SVT to something else. If you can’t see a doctor, then you should at least some sort of health care provider. Surely there’s some sort of clinic you could go to.

          • Humna khan

            It can be hyperventilation because I suffer from panic attacks at night. I would try to see a doctor .
            thank you so much

  • engineering_student

    Adderall has been doing some nasty things to my heart rate and blood pressure. Thank you for the tips.

    • James Hubbard, MD, MPH

      You’re welcome.

  • dani k

    I am 20 years old and I was diagnosed with an electronic arrhythmia in my heart. I feel palpitations often but it is so much worse when I drink coffee. I know I shouldn’t have caffeine, but i find t really hard to stay energized without it. I need advice for what to do when the palpitations come and also how to stay energized without hurting my heart.. any suggestions?

    • James Hubbard, MD, MPH

      Dani, it sounds like you’ll have to chose between palpitations and caffeine. Maybe, cut back at least. I’m assuming you’ve had a blood check for thyroid problems and anemia. In general, regular exercise such a walking at a moderate pace (where you’re a little breathy but still able to talk) for 20-30 minutes a day increases energy and decreases palpitations.

  • Nordlys

    My heart rate doesn’t make sense. 100 every minute, with high stamina and low sense of fatigue when I do sport.
    It doesn’t even match my breath rate that is average, compared to heartbeat.

    • James Hubbard, MD, MPH

      If I understand correctly, your resting heart rate is 100 even though you’re in pretty good shape. (The breath rate has nothing to do with your heart rate.) You might consider a good checkup that includes blood tests such as for anemia and for thyroid disease.

  • TicklePick

    Use the app Breath Pacer on your iPhone or iPad to pace your breaths!