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      Heart rate variability: measurement and clinical utility.

      Annals of Noninvasive Electrocardiology

      Time Factors, Humans, physiology, Heart Rate, physiopathology, Heart Conduction System, Electrocardiography, Cardiovascular Diseases, Autonomic Nervous System

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          Abstract

          Electrocardiographic RR intervals fluctuate cyclically, modulated by ventilation, baroreflexes, and other genetic and environmental factors that are mediated through the autonomic nervous system. Short term electrocardiographic recordings (5 to 15 minutes), made under controlled conditions, e.g., lying supine or standing or tilted upright can elucidate physiologic, pharmacologic, or pathologic changes in autonomic nervous system function. Long-term, usually 24-hour recordings, can be used to assess autonomic nervous responses during normal daily activities in health, disease, and in response to therapeutic interventions, e.g., exercise or drugs. RR interval variability is useful for assessing risk of cardiovascular death or arrhythmic events, especially when combined with other tests, e.g., left ventricular ejection fraction or ventricular arrhythmias.

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          Journal
          10.1111/j.1542-474X.2005.10101.x
          15649244

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