Trends in electrocardiograph design

Watts, M. P.; Shoat, D.B.

doi:10.1049/jiere.1987.0055

Cited by 20 publications

(8 citation statements)

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“…The ECGs were recorded by a Siemens Mingorec 4 or by a computer compatible electrocardiograph designed locally [5]. The amplitudes of the QRS voltages were measured by a computer program described elsewhere [6].…”

Section: Methodsmentioning

confidence: 99%

Assessment of selected ECG voltage criteria for abnormality in eccentric and concentric left ventricular hypertrophy

Huwez

Macfarlane

2003

Computers in Cardiology, 2003

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The effect of left ventricular volume (LVV) in relation to the left ventricular mass (LVM) was studied on the voltage electrocardiographic (ECG) criteria of left ventricular hypertrophy (LVH). IntroductionIt is well recognized that there are numerous physiological and pathological factors that affect ECG criteria for left ventricular hypertrophy (LVH) [1]. In 1960, Allenstein and Mori evaluated ECG criteria that were introduced for the diagnosis of LVH and they noticed that the literature at that time included over 30 ECG criteria [2]. However, in clinical practice, voltage criteria are the most commonly used despite the evidence that voltage ECG-LVH criteria are influenced by many factors that might commonly co-exist with LVH. For example, there is evidence that increased left ventricular volume (LVV) might potentiate the QRS voltages [3,4]. Therefore, it might be expected that the ECG-LVH voltage criteria would be more positive in LVH with LV dilatation than in LVH with normal LVV. MethodsConsecutive patients attending the echocardiography laboratory in Glasgow Royal Infirmary were recruited to the study provided that they had documented echo LVH in the absence of hypertrophic obstructive cardiomyopathy, bundle branch block, pericardial disease, kyphoscoliosis or emphysema, or history of myocardial infarction.The ECGs were recorded by a Siemens Mingorec 4 or by a computer compatible electrocardiograph designed locally [5]. The amplitudes of the QRS voltages were measured by a computer program described elsewhere [6]. All the amplitudes were also checked manually and were compared to age and sex dependent normal limits that were derived from an earlier study from our department [7]. The sensitivity of the following ECG-LVH voltage criteria was assessed in the twogroupsofechoLVH: The echocardiographic examinations were undertaken with a Diasonics 3400 Cardiovue phased imaging system as described in a previous study [11]. The M-mode echo dimensions of the left ventricle (LV) were used to calculate left ventricular mass (LVM) according to the Penn convention [12] but left ventricular volume (LVV) was estimated using the equation of Pombo et al [13]. Both the derived echo LVM and LVV were indexed to body surface area (BSA) according to the formula of DuBois and DuBois [14]. Patients with echo LVH were defined by echo LVM indexed to BSA exceeding 131 g/m 2 in men and 109g/m 2 in women [15]. LVV indexed to BSA (LVVI) exceeding 90 ml/m 2 identified those patients with LVH and LV dilatation [13]. Based on one of our earlier studies [11], concentric LVH was defined as increased LVM indexed to BSA in the presence of a normal or even reduced LVV (indexed to BSA), while patients with eccentric LVH were identified when LVH was associated with left ventricular dilatation. Results36 patients completed the study including 25 men and 11 women. They had a mean age of 54.6 years and an age range of 30-72 years. The underlying pathological conditions included hypertension in 28 patients and 0276−6547/03 $17.00

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Section: Methodsmentioning

confidence: 99%

Assessment of selected ECG voltage criteria for abnormality in eccentric and concentric left ventricular hypertrophy

Huwez

Macfarlane

2003

Computers in Cardiology, 2003

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“…A completely new electrocardiograph was designed and several were built over the following years. Only recently, however, was the description of the electrocardiograph published [5]. This device also included many facilities for checking the quality of the recording for lead failure, excessive noise, etc.…”

Section: Methodology Of Ecg Interpretation In the Glasgow Programmentioning

confidence: 99%

Methodology of ECG Interpretation in the Glasgow Program

Macfarlane¹,

Devine²,

Latif³

et al. 1990

Methods Inf Med

123

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“…The 10 s recordings, sampled at 2 ms interval, included eight independent leads (i, ii, VI-V6). The recordings were obtained with an ECG machine designed and developed in Glasgow Royal Infirmary (WATTS and SHOAT, 1987). The age and gender distribution of the subjects are shown in Table 1.…”

Section: -Lead E C G Recordingsmentioning

confidence: 99%

Gender differences in stability of the instantaneous patterns of body surface potentials during ventricular repolarisation

Corlan

Macfarlane

Ambroggi

2003

Med. Biol. Eng. Comput.

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Women have a higher risk of developing torsade de pointes under OT-prolonging conditions. The electrophysiological differences between the sexes that could account for this are largely unknown. The objective of the work was to evaluate gender differences in repolarisation potentials using a method that is independent of the specific electrical properties of the thorax. 1410 normal recordings from the Glasgow 12-lead ECG database and 52 normal ECG maps obtained separately in Milan were analysed. The average difference between 1 and the correlation coefficient of the instantaneous pattern at the peak of T with that at every other instant is called the early repolarisation deviation index (ERDI) for J-T peak and the late repolarisation deviation index (LRDI) for T peak-T end. In standard ECG recordings, the ERDI was 0.42 +/- 0.22 in females compared with 0.19 +/- 0.16 in males (p < 10(-6)). The LRDI was higher in males under the age of 50. In body surface maps, the ERDI was 0.32 +/- 0.21 in females against 0.16 +/- 0.17 in males (p < 0.01), and the LRDI was non-significantly higher in males. The pattern of instantaneous body surface potentials showed gender differences during repolarisation with a method that is independent of the electrical properties of the thorax.

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Trends in electrocardiograph design

Cited by 20 publications

References 0 publications

Assessment of selected ECG voltage criteria for abnormality in eccentric and concentric left ventricular hypertrophy

Assessment of selected ECG voltage criteria for abnormality in eccentric and concentric left ventricular hypertrophy

Methodology of ECG Interpretation in the Glasgow Program

Gender differences in stability of the instantaneous patterns of body surface potentials during ventricular repolarisation

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