The first instruments, e.g. the electrocardiograph developed by Waller in 1887, were heavy, immobile and required various technical aids for operation. Only ventricular deflections could be made visible. These instruments were not yet suited for clinical applications.
In the mid twenties tube amplifiers were developed. These could intensify and record electrical potential. These lightweight and easy to operate instruments could be used for diagnostic information in a normal general practice.
The instruments which were developed during the fifties were equipped with transistors and recorded the ECG’s result on paper. These instruments were already smaller and very handy.
As development progressed, electronic parts were integrated. Thus it was possible to monitor individual leads autonomously. Even semi- or full-automatic program-controlled ECGs could be printed out which were already centered truly and formatted.
The use of accumulators made the operation of ECG-instruments possible everywhere. The advances in electronics provided instruments that made it possible to print out also the individual data of patients, such as name, age and medication.
With the instruments currently in use in general practices or hospitals the intervals of the individual segments can be entered and they can be printed out and can confirm a suspected diagnosis. By the use of integrated interfaces data transfer and storage became possible.
Cardiovascular diseases, such as cardiac infarction, apoplectic stroke and arrhythmia belong to the most frequent diseases in industrial nations.
In order to be able to control heart activity at any time, at home or elsewhere, the very small and lightweight, portable ECG instruments were developed.
With this new generation of mobile ECG-instruments cardiovascular diseases can be detected at an early stage and already existing diseases can be controlled safely.
In case of any heart trouble an ECG recording can be made immediately.
This recording can be presented to the doctor for evaluation and diagnosis.
Doctors can successfully use the portable ECG instruments when visiting patients, suffering from cardiovascular diseases, at home.