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healthquestions.medhelp.org/heart-rate-below-40

My heart rate for some reason was up to 114 and in about half an hour (when I regularely pass out after standing with out moving) my heart rate shot down to below 40.I got light headed and managed to keep standing for some time.

www.healthtap.com/topics/is-a-heart-rate-of-40-dangerous

Helpful, trusted answers from doctors: Dr. Werner on is a heart rate of 40 dangerous: If you don't have any symptoms like dizziness, pre-syncope, syncope or fatigue or chest pain or shortness of breath, then you are ok. But you complained of chest pain. Hence it should be treated. Its etiology should be elicited. Thyroid problems and blocks in heart arteries should be ruled out. Consult your ....

myheart.net/articles/low-heart-rate-bradycardia-explained-by-a-heart-doctor

The medical term for a low heart rate is bradycardia. Sometimes a low heart rate is defined as below 60 beats per minute, but it would probably make more sense to have low heart rate defined as below 50 beats per minute. Patients often ask if they have a low…

www.runnersworld.com/health-injuries/a20851173/is-my-resting-heart-rate-too-low

Because the normal range of a resting heart rate is between 60 to 100 bpm, a resting heart rate under 60 beats per minute is considered slow, often referred to as bradycardia.

www.answers.com/Q/Is_a_heart_rate_of_40_dangerous_for_a_57_year_old_man

A heart rate of 40 is a bit slow for anyone. A slow heart rate is called bradycardia, and can be a symptom of many things. The most common is medications. A very common kind of medication, called ...

www.livestrong.com/article/78113-effects-less-beat-per-minute

During sleep and deep relaxation, your heart rate may slow, and some athletes have a slower pulse as a result of their training. It can be normal for an athlete's heart to beat 30 to 40 times a minute; but when training, the heart rate could rocket to a high pulse rate of 180 beats a minute.

en.wikipedia.org/wiki/Bradycardia

Bradycardia is a condition typically defined wherein an individual has a resting heart rate of under 60 beats per minute (BPM) in adults. Bradycardia typically does not cause symptoms until the rate drops below 50 BPM. When symptomatic, it may cause fatigue, weakness, dizziness, sweating, and at very low rates, fainting. During sleep, a slow heartbeat with rates around 40–50 BPM is common ...

www.healthline.com/health/slow-heart-rate

Your heart rate is the number of times your heart beats in one minute. Heart rate is a measure of cardiac activity. A slow heart rate is considered anything slower than 60 beats per minute for an ...

www.medhelp.org/posts/Heart-Rhythm/heart-rate-in-30s-is-it-normal/show/1731709

I have been more tired than usual lately, also am hypo thyroid. My TSH is out of whack and the dose was adjusted in mid Feb. My heart rate has been in the 40's, with blood pressure such as 108/60 and 42, then blood pressure of 149/95 and heart rate of 38 , 91/ 64 heart rate 76, 146/91 heart rate 45, 136/80 heart rate 36 147/98 heart rate 40. goes on and on.

www.hrsonline.org/patient-resources/slow-heartbeat

Slow heartbeat (heart rate), called bradycardia, is an arrhythmia, or disorder of the heart’s rhythm. Each day, a normal heart beats about 100,000 times, at a rate any­where from 60 to 100 times a minute. Changes in heart rate caused by activity, diet, medications, and age are normal and common.