Tachycardia
heart rate that exceeds the normal resting rate
Tachycardia, also called tachyarrhythmia, is a heart rate that exceeds the normal resting rate. In general, a resting heart rate over 100 beats per minute is accepted as tachycardia in adults. Heart rates above the resting rate may be normal (such as with exercise) or abnormal (such as with electrical problems within the heart).
Complications
Tachycardia can lead to fainting.
When the rate of blood flow becomes too rapid, or fast blood flow passes on damaged endothelium, it increases the friction within vessels resulting in turbulence and other disturbances. According to the Virchow's triad, this is one of the three conditions (along with hypercoagulability and endothelial injury/dysfunction) that can lead to thrombosis (i.e., blood clots within vessels).
Causes
Some causes of tachycardia include:
Diagnosis
The upper threshold of a normal human resting heart rate is based on age. Cutoff values for tachycardia in different age groups are fairly well standardized; typical cutoffs are listed below:
1–2 days: >159 beats per minute (bpm)
3–6 days: >166 bpm
1–3 weeks: >182 bpm
1–2 months: >179 bpm
3–5 months: >186 bpm
6–11 months: >169 bpm
1–2 years: >151 bpm
3–4 years: >137 bpm
5–7 years: >133 bpm
8–11 years: >130 bpm
12–15 years: >119 bpm
15 years–adult: Tachycardia >100 bpm
Heart rate is considered in the context of the prevailing clinical picture. When the heart beats excessively or rapidly, the heart pumps less efficiently and provides less blood flow to the rest of the body, including the heart itself. The increased heart rate also leads to increased work and oxygen demand by the heart, which can lead to rate related ischemia.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 13, 2026. The linked authority identifier is Q209583. The Library of Congress control number is sh85131847. 1 of 1 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank.
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