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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). ==Definition== The upper threshold of a normal human resting heart rate is based upon age. Tachycardia for different age groups is as listed below:〔Custer JW, Rau RE, eds. Johns Hopkins: The Harriet Lane Handbook. 18th ed. Philadelphia, PA: Mosby Elsevier Inc; 2008. Data also available through (eMedicine: Pediatrics, Tachycardia ).〕 * 1–2 days: Tachycardia > 159 beats per minute (bpm) * 3–6 days: Tachycardia >166 bpm. * 1–3 weeks: Tachycardia >182 bpm * 1–2 months: Tachycardia >179 bpm * 3–5 months: Tachycardia >186 bpm * 6–11 months: Tachycardia >169 bpm * 1–2 years: Tachycardia >151 bpm * 3–4 years: Tachycardia >137 bpm * 5–7 years: Tachycardia >133 bpm * 8–11 years: Tachycardia >130 bpm * 12–15 years: Tachycardia >119 bpm * >15 years – adult: Tachycardia >100 bpm Heart rate is considered in the context of the prevailing clinical picture. For example: in sepsis >90 bpm is considered tachycardia. 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.〔Harrison's Principles of Internal Medicine, 17th Edition〕 Relative tachycardia involves a greater increase in rate than would be expected in a given illness state. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tachycardia」の詳細全文を読む スポンサード リンク
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