24 research outputs found
Prediction of cardiac death : an epidemiological study on the prognostic significance of 24-hour ECG-recording
Since the introduction of the string galvanometer by Einthoven (1901),
various instruments have been developed (a technical review is given by
Dunn & Rahm, 1950) to record the so-called electrocardiogram (ECG).
Physical activity, changes in position and certain bodily functions such
as digestion and sleep were found to be associated with changes in the
ECG.
The ECG is therefore recorded while the patient is lying down and
relaxed. The length of such a resting ECG (also referred to as standard
or 12-lead ECG) varies from 10 to 45 seconds. Transient phenomena can
easily be missed in this way. lf desired, the length of the ECG can be
extended. However, the patient is not free to move and the analysis of
the large number of ECG complexes soon becomes burdensome. In 1944, Likoff et al described an instrument for the continuous recording
of the electrocardiogram. This utilized an optica! system which reearcled
the ECG complexes on 16mm film. The minute images could be projected on
a screen or photographic paper at the size of an ordinary electrocardiogram.
Hith this instrument they made ECG-recordings of up to 10 hours
of patients undergoing surgery, of patients with transient arrhythmias,
patients in whom a patent ductus was being ligated and of patients
approaching death. In all cases, the patient was confined to a hospita!
bed. It was nat necessary to watch the ECG continuously while it was
being recorded.
From this report, the value of continuous monitoring of the ECG was
clear. It permitted study of transient phenomena and of the influence of
various circumstances on the activity of the heart. Since then, electronic
instruments have supersecled this optical design. However, the concept of
continuous ECG-recording had taken root and different lines of development
can be traeed in this area
Association of infections with human immunodeficiency virus and human papillomavirus in Honduras
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25323___.PDF (publisher's version ) (Open Access
A sero-epidemiological study of the relationship between sexually transmitted agents and cervical cancer in Honduras
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25826___.PDF (publisher's version ) (Open Access
Typhoid fever in Ujung Pandang, Indonesia - high -risk groups and high risks behaviours
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25155.pdf (publisher's version ) (Closed access
A sero-epidemiological study of the relationship between sexually transmitted agents and cervical cancer in Honduras
Co-factors related to the causal relationship between humen papillimavirus and invasive cervical cancer in Honduras
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