Day to day and beat to beat variation in normal 3 orthogonal lead electrocardiograms.
نویسندگان
چکیده
Beat to beat and day to day variation in computer calculated electrocardiographic measurements is described on the basis of a study of normal serial 3 orthogonal lead electrocardiograms recorded on 25 patients. The variation of scalar amplitudes and vector orientations was investigated for both the QRS complex and the ST-T segment. The 96 per cent ranges of beat to beat and day to day variation are presented together with other statistical measurements. The beat to beat variation was always less than the day to day variation for the QRS complex but this was not always the case for ST-T segment data which are more prone to measurement error. The results derived are of value in theformulation of criteriafor the detection of abnormal day to day changes in the electrocardiogram by computer.
منابع مشابه
Day to day variation in 3 orthogonal lead electrocardiogram parameters after acute myocardial infarction.
Serial 3 orthogonal lead electrocardiograms were recorded on 67 patients with acute myocardial infarction. For each series of electrocardiograms, the day to day changes and the changes with respect to the initial computer measurements of selected ST-T segment amplitudes and vector orientations were investigated. The results indicated that the degree of rotation of ST-T vectors, which correspond...
متن کاملPhysiological correlates of beat-to-beat, ambulatory, and day-to-day home blood pressure variability after transient ischemic attack or minor stroke.
BACKGROUND AND PURPOSE Visit-to-visit and day-to-day variability in systolic blood pressure (SBP) are associated with an increased risk of stroke, more strongly than variability on 24-hour ambulatory BP monitoring, but underlying physiological mechanisms are unclear. We related potentially relevant physiological characteristics to beat-to-beat, ambulatory, and day-to-day BP variability to ident...
متن کاملBinaural beat stimulation - a non-invasive method for inducing zebrafish growth
An initial experimental study was conducted to evaluate the effects of binaural beats on fish growth performance. A 90-day trial with four triplicate groups was conducted with 240 zebrafish, Danio rerio, under aquarium conditions. Binaural beat file complexes were played for each aquarium using computer controlled directional speakers for 0 min d-1(Control), 90 min d-1(Group 1), 180 min d-1 (Gr...
متن کاملPrognostic Significance of Blood Pressure Variability on Beat-to-Beat Monitoring After Transient Ischemic Attack and Stroke
BACKGROUND AND PURPOSE Visit-to-visit and day-to-day blood pressure (BP) variability (BPV) predict an increased risk of cardiovascular events but only reflect 1 form of BPV. Beat-to-beat BPV can be rapidly assessed and might also be predictive. METHODS In consecutive patients within 6 weeks of transient ischemic attack or nondisabling stroke (Oxford Vascular Study), BPV (coefficient of variat...
متن کاملEffect of endotoxemia on heart rate dynamics in rat isolated perfused hearts
Introduction: Beat-to-beat variation in heart rate shows a complex dynamics, and this complexity is changed during systemic inflammatory response syndrome (e.g. sepsis). It is not known whether or not cardiac pacemaker dynamical rhythm is affected by sepsis. The aim of this study was to investigate heart rate dynamics of isolated heart as well as expression of pacemaker channels (HCN) in a r...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- British heart journal
دوره 36 12 شماره
صفحات -
تاریخ انتشار 1974