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[Ways of improvement of the accuracy of arterial pressure oscillometry].

The history of the auscultation method of arterial pressure (AP) measurement dates back to more than century ago. Nevertheless, the problem of the accuracy of measurement is still on the agenda. Standards of the accuracy of measurements and data processing are subjects of regular revision and update. The accuracy and reliability of AP monitoring in complex clinical cases are competitive advantages important for manufacturers of medical monitors. A new Triton ElectronicS module for AP measurements based on original technology and results of its testing are considered in this work. An original algorithm of the module operation provides an opportunity for more accurate and convenient monitoring, particularly in case of disordered hemodynamics.

Arteries↗
PubMed1990

[Effect of physical stress on airway resistance determined by oscillometry].

For evaluation of reference values of airway resistance measured by forced oscillation technique (Ros) in connection with physical exercise, 193 healthy persons were examined. In this study could be shown that reference values measured at rest are also valid under exercise conditions to find out functional disorders.

Adolescent↗
PubMed1989

[Optimizing monofrequent oscillometry].

Against the background of the working hypothesis of the 1-parametric Siregnost FD 5 forced oscillation technique-phase angle psi may be invariant in a clinical reference population-the hypothetical straight Ros-P line is in good agreement with the crowd of extremely nonlinear Rre-P-lines only within narrow limits. Neglecting phase angle measurements it might be useful to insert a known linear resistor into the airway to determine the pertaining Rre-P relation. In spite of selective tuning to the oscillation frequency of 10 Hz there is full sensitivity to stationary flow; alinear stationary flow characteristics of resistors can be readily determined by forced oscillation. There is a marked improvement in the P-psi/Rre-phi-evaluating system with respect both to the symmetry of phase angle and unequivocality of pressure when the reference phase angle alpha is shifted from 81 degrees to 0 degrees. Using digital data acquisition and processing, a flexible evaluation technique with monitor-oriented test management, automatical calculation of secondary values and multidimensional presentation of results on a graphical display is provided, which has proved its worth in experimental and clinical-physiological studies.

Airway Resistance↗
PubMed1989

[Polyfrequent oscillometry measurement of airway resistance including the associated phase angle].

In 52 subjects aged between 28 and 80 years (healthy subjects, patients with obstructive and restrictive pulmonary disease), the airway resistance including the associated phase angle was investigated employing the forced oscillation technique at various frequencies (8, 12 and 16 Hz). Measurements were performed using a device manufactured by the firm of Custo, which makes possible the direct determination of oscillatory pressure and alternating flow at the mouth. With the aid of the phase angle, the airway resistance Rfo was calculated in approximation on the basis of the recorded impedance. As a reference unit, a body plethysmograph manufactured by the firm of Jaeger was employed. The short-term intra-individual variability of the oscillatory resistance measurements was, at 15%, within the fluctuation range of Rtot. The best agreement of Rfo and Rtot was achieved at 8 Hz (r = 0.83). With increasing frequency, the correlation decreased appreciably. Even in the presence of normal Rfo, negative phase angles indicated a disturbance of the mechanics of respiration. In comparison with the oscillatory resistance the determination with a bridge circuit, the reference values measured were compatible with those obtained with whole-body plethysmography. Direct measurement of Rfo and the associated phase angle, compares favourably with the reference tube technique in terms of the lack of complexity of the apparatus and a reduction in operator effort, and is thus a measuring system that is suitable for use in the doctor's office.

Adult↗