[24-hour recording in personnel employed in the intensive cardiac care unit]. / 24-godzinny zapis ekg u personelu zatrudnionego w Osrodku Intensywnej Opieki Kardiologicznej.

The authors, expecting confirmation of arrhythmogenic effects of work at the Intensive Cardiological Care Unit (ICCU), recorded a 24-hour ECG in the employed staff. Together 20 healthy individuals (mean age 31.6 years) were tested. ECG was recorded twice at the unit, and repeated at home. Ventricular arrhythmia was noted in 60% of tested individuals at home (mean number of excitations 6 per 24 hours). It was 2.5 times more frequent at ICCU (mean number of excitations 15 per 24 hours) involving 75% of tested individuals. Atrial arrhythmia was noted also in 60% of the tested individuals at home (mean number 16 per 24 hours) whereas it was noted in 85% of the tested individuals at ICCU, i.e. 2.5 times more frequently than at home (mean value 40/24 hours). Both atrial and ventricular arrhythmias are significantly more frequent during night rest at ICCU than that at home. Results suggest that the employment at ICCU is arrhythmogenic.

[Comparative investigation of cardiac output using impedance rheography and invasive methods]. / Badania porównawcze rzutu minutowego serca metoda reografii impedancyjnej i metodami inwazyjnymi.

Authors performed comparative measurements of cardiac output using the impedance rheography and Fick's method in healthy men (6) reaching the value of correlation coefficient 0.88 and in patients with acquired cardiac defects (n = 21; r = 0.68). Authors also compared cardiac output values measured at rest and during exercise by means of thermodilution and rheographic methods in patients with heart failure (n = 9). Correlation coefficient was respectively 0.92 and 0.81.