XYZ data interpreted by a 12-lead computer program using the derived electrocardiogram

Dower, Gordon E.; Machado, Hilário Bastos

doi:10.1016/s0022-0736(79)80058-8

Cited by 37 publications

(13 citation statements)

References 24 publications

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“…Nevertheless, these previous studies lack statistical analysis [6,7,10], quantitative data [6±8, 10,11], or any relation to clinical diagnoses [8,9]. Furthermore, some studies were based on a computerized myocardial infarction analysis program without reported accuracy [8,9] or a simplified, unvalidated Frank lead system [11].…”

Section: Discussionmentioning

confidence: 99%

Comparison of electrocardiograms recorded with standard leads and derived from the vectorcardiographic Frank leads in high-risk patients

Gannedahl¹,

Ljungqvist

Lundin

et al. 1997

Intensive Care Medicine

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Dynamic vectorcardiography (VCG) is increasingly employed for ischaemia monitoring with the use of a computerized method for recording and on-line analysis by the calculation of trend parameters. To elucidate how well the derived electrocardiogram (dECG), calculated from the VCG, compares with the simultaneously registered standard ECG (sECG), dECGs from 17 postoperative cardiac-risk patients and 36 subjects with acute myocardial infarction (AMI) were compared to sECGs, both quantitatively in leads II, III, V2 and V5 and qualitatively. Despite small, but some significant differences, mainly in the amplitudes of precordial leads, the qualitative interpretation by two independent cardiologists showed good agreement between the methods (kappa = 0.72 and 0.67, respectively) for the diagnosis of AMI/ischaemia. The dECG seems to be reliable and can be used clinically in these groups of patients during VCG recordings.

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Section: Discussionmentioning

confidence: 99%

Comparison of electrocardiograms recorded with standard leads and derived from the vectorcardiographic Frank leads in high-risk patients

Gannedahl¹,

Ljungqvist

Lundin

et al. 1997

Intensive Care Medicine

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“…Although there is a paucity of similar research in space medicine, a retrospective study performed by Hamilton et al [133] compared derived 12-lead ECGs [134][135][136][137][138][139][140][141][142][143][144] collected as part of periodic fitness examinations (PFE) on the ISS to prelaunch exercise stress tests. A PFE is performed on a cycle ergometer which has a preprogrammed load profile prescribed by ground based exercise countermeasure experts.…”

Section: Prevention Of Cardiovascular Disease In Spaceflight Crewsmentioning

confidence: 99%

“…The crew's ECG tracings are recorded with four electrodes connected to a conversion network to provide the standard 10-electrode, 12-lead electrocardiogram. For simplification purposes, 4-lead EASI electrodes (leads E, A, and I of the Frank lead system plus an additional S lead positioned over the superior end of the sternum) [258][259][260] (Figure 16.2) are placed and the acquired data are stored and downlinked for retrospective analysis. A study by Drew et al [261] in which 540 patients were tested with this 4-lead system showed that the agreement with standard 12-lead electrocardiography was 100% for arrhythmias, 100% for acute infarction, 95% for angioplasty-induced ischemia, and 89% for transient ischemia.…”

Section: Periodic Cardiovascular Evaluationsmentioning

confidence: 99%

Cardiovascular Disorders

Hamilton¹

2008

Principles of Clinical Medicine for Space Flight

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“…The other method is to synthesize the signals using Frank lead vectors. 2,3,17,18 It is possible to calculate the lead vector from the Frank's image surface leads, but it is a theoretical value that is experimentally produced using the torso model with single dipoles. 5 Therefore, the uniqueness of the patient's physique, position of the heart and conductance volume (thorax, lungs, blood flow, skin, etc) are thought to affect the difference between the actual and theoretical values of the lead vectors.…”

Section: Procedures To Record More Ecg Leads Using a Holter Monitoringmentioning

confidence: 99%

New Holter Monitoring Analysis System-Synthesizing 12-Lead Electrocardiograms Using a Calculation of the Lead Vectors-

Nanke¹,

Nakazawa²,

Sakurai³

et al. 2004

Circ J

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novel method of synthesizing a 12-lead electrocardiogram (ECG), with practically identical waveforms to the standard 12-lead ECG (Stn-ECG), using the ECG signals from the X, Y and Z Frank leads, 1 has been developed, resulting in the synthesis of ECG waveforms closely resembling those of the Stn-ECG. 2,3 However, the individuality of the lead vector has been hindered by that synthesis. In the present study, we verified the usefulness of (1) the automatic correction of the lead vector and (2) the synthesis of the ECG from 3-channel recordings using the normal digital Holter monitoring system. Methods SubjectsThe subjects consisted of 29 individuals: 13 consecutive subjects who had had an ECG recorded with the present system (12 males, 1 female, mean age 64±10 years, range: 39-74) that included 7 with myocardial infarctions (4 anterior wall and 3 inferior wall), 5 with complete bundle branch block (BBB) (4 right BBB and 1 left BBB) and 1 with atrial fibrillation, and 16 normal volunteers (mean age Circulation ECG RecordingTo record the synthesized ECG (Syn-ECG), 5 electrodes were placed on the body surface, with the anode consisting of the V1 and V5 positions, and the point of intersection Circ J 2004; 68: 751 -756 (Received February 9, 2004; revised manuscript received April 20, 2004; accepted May 14, 2004 New Holter Monitoring Analysis System Synthesizing 12-Lead Electrocardiograms Using a Calculation of the Lead VectorsToshihiko Nanke, MD; Kiyoshi Nakazawa, MD; Tsuneharu Sakurai, MT; Naoki Matsumoto, MD*; Ryouji Kishi, MD; Akihiko Takagi, MD; Chuichi Sato, MD; Fumihiko Miyake, MD; Takashi Yamaki**; Mutsuo Kaneko** Background A new system of synthesizing a 12-lead electrocardiogram (Syn-ECG) with practically identical waveforms to the standard 12-lead ECG (Stn-ECG) from 3-channel ECGs recorded by Holter monitoring has been developed. Methods and ResultsThe study group comprised 16 healthy individuals and 13 patients with abnormal ECGs. The bipolar eV1, eV5 and eVF leads were recorded using digital Holter monitoring and nine Syn-ECGs, corresponding to each lead of the Stn-ECG, were synthesized. The 9 ECGs consisted of a theoretical Syn-ECG and 8 Syn-ECGs positioned around the theoretical Syn-ECG at 3 cm intervals on the Frank's image surface. Of the 9 ECGs, the Syn-ECG with the maximum product of the cross-correlation coefficient of the QRS wave and that of the T wave, was automatically selected as the optimal Syn-ECG. The amplitude data from the QRS wave, R wave, T wave, and ST level, and also the amplitude ratio of the R wave, T wave to the QRS wave, were significantly well correlated between the Syn-ECG and Stn-ECG. Conclusions A practically identical ECG morphology, comparable with a Stn-ECG, was successfully created using this system. (Circ J 2004; 68: 751 -756)

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XYZ data interpreted by a 12-lead computer program using the derived electrocardiogram

Cited by 37 publications

References 24 publications

Comparison of electrocardiograms recorded with standard leads and derived from the vectorcardiographic Frank leads in high-risk patients

Comparison of electrocardiograms recorded with standard leads and derived from the vectorcardiographic Frank leads in high-risk patients

Cardiovascular Disorders

New Holter Monitoring Analysis System-Synthesizing 12-Lead Electrocardiograms Using a Calculation of the Lead Vectors-

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