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PubMed1982

The effect of age on heart rate in subjects free of heart disease. Studies by ambulatory electrocardiography and maximal exercise stress test.

To delineate the effects of true aging, undetected heart disease and deconditioning on heart rate, we performed 24-hour ambulatory electrocardiography and maximal exercise stress test on 101 subjects with normal hearts. The maximal heart rate recorded was 180 beats/min; the minimum was 35 beats/min. A distinct diurnal pattern was observed. With increasing age, a decrease of the maximal heart rate achieved during exercise stress test (r = 0.27, p = 0.05) or spontaneously recorded during the day (r = 0.41, p = 0.0005) or night (r = 0.24, p = 0.03) was observed. The resting and average heart rates were not affected by age. Older subjects had lower exercise tolerance (r = 0.41, p = 0.0001). Low exercise tolerance was associated with higher increments of heart rate for submaximal exercise levels (r = 0.0001) and lower maximal heart rates (r = 0.43, p - 0.008). These changes of heart rate with age are not due to undetected cardiac disease, because the subjects included in the study were meticulously screened by noninvasive and invasive means.

Adolescent↗

PubMed2004

Ventricular bigeminy misdiagnosed as fetal bradycardia by cardiotocography--the value of non-invasive fetal electrocardiography.

We document the value of non-invasive fetal electrocardiography (fECG) in a case of fetal arrhythmia in which an unnecessary cesarean section was almost performed. The fetal heart rate (fHR) was 60-70 beats per minute (bpm) on the cardiotocography (CTG), with occasional, sudden fluctuations to 130 bpm. This was probably a result of the technical limitations of the CTG.

Adolescent↗

PubMed2006

[Exercise electrocardiography for diagnostic and prognostic assessment of coronary disease. Recent advances].

This article focuses on recent advances on exercise electrocardiography (ECG) for the diagnostic and prognostic assessment of coronary artery disease. In particular, the pathophysiological background of comparative heart rate-adjusted ST-segment analysis during exercise and recovery phase is discussed. In addition, the results of recent studies dealing with the application of this ECG analysis modality to different clinical settings are presented.

Coronary Artery Disease↗

PubMed1984

[Importance of electrocardiography under physical loading for the early diagnosis of ischemic heart disease in a nonintegrated polyclinic].

With the physical loading, performed under polyclinical conditions, on 78 subjects, aged from 22 to 53, with undistinguished and atypical precordial pains, combined with prevailing neurasthenic complaints, with vegetative symptomatics, positive ECG findings were established in 28 of them (35%) - horizontal and descending depression of the segment S-T - 23 patients, lowering of type J - 5 patients. Suspicious signs of IHD were found in 17 from the examined, manifested with insufficient decrease of the segment S-T. Resulting from the physical loading of the whole patient group, suspicious of IHD, cardiac neurosis was established in 65 per cent of them (having been loaded to 150 W). The electrocardiography with physical loading proved to be a particularly valuable method in the diagnostics of IHD with an atypical course as regards the clinical manifestations or as regards the electrocardiographic findings.

Adult↗

PubMed1995

[Usefulness of time domain analysis of signal averaged electrocardiography in patients with sustained ventricular tachycardia and intraventricular conduction disturbance].

To determine the usefulness of time domain analysis of signal averaged electrocardiography (SAECG) in predicting the occurrence of sustained ventricular tachycardia (SVT) in patients with intraventricular conduction disturbance (IVCD), SAECG was recorded in 70 patients with IVCD; 24 of whom had a history of SVT. We divided patients into two groups; patients with rigth bundle branch block pattern (RBBB group, 36 patients) and left bundle branch block pattern (LBBB group, 34 patients). TQRSD, T40 and V40 were compared between patients with and those without SVT in the RBBB and LBBB group, respectively. All three parameters in the RBBB group and only V40 in the LBBB group showed a significant difference between patients with and those without SVT. In RBBB group TQRSD > or = 160 ms, T40 > or = 40 ms, V40 < or = 14 microV can distinguish patients with SVT from those without SVT with a sensitivity and specificity of 77% and 78%, 85% and 70%, 77% and 74%, respectively. In the LBBB group, only V40 < or = 14 microV can distinguish patients with SVT from those without SVT with 82% sensitivity and 87% specificity.

Aged↗

PubMed1965