Biomedical subjects

H W Striebel

Publications and source records attributed to H W Striebel.

39 records · Page 3Linked to original sources

PubMed1989

[The functional principle, reliability and limitations of pulse oximetry].

Pulse oximetry has found wide-spread application in recent years. It is simple, noninvasive and continuous method for measuring arterial oxygen saturation. This survey deals with the history of pulse oximetry, its technical foundations, the differential indications and contraindications, and its limitations and possibilities for error. A number of suggestions are made for improving the accuracy of measurement and the interpretation of values. These include improved calibration, including low saturation ranges (below 70%) and the development of pulse oximeters that measure with more than two wavelengths, which would eliminate measuring errors due, for example, to carboxyhemoglobin.

Humans↗

PubMed1988

[The reliability of pulse oximetry monitoring of arterial oxygen saturation in centrally intubated and hypothermic patients].

The present study tests the effectiveness of pulse oximetric measurement in attaining reliable saturation values even in patients with hypothermia and centralization. 20 patients who had all required endoprosthetic surgery of the lower extremities were included in the study. During the process of removing 98 samples for arterial blood-gas analysis, pulse oximetric saturation, heart rate (pulse oximeter and ECG), rectal temperature, peripheral temperature at the back of the fingers, arterial pressure (catheter) and central venous pressure were registered. The results can be summarized as follows: 1. Acute changes in arterial saturation can be very quickly recognized with the help of pulse oximetry. 2. The reliability of pulse oximetric measurement is, in the area examined, dependent neither on the peripheral nor the rectal temperature, nor on the temperature difference between the core and surface temperature of the body, and, therefore not dependent on the degree of centralization. 3. In the area examined, the reliability of pulse oximetric measurement is influenced neither by blood pressure fluctuations nor by intravascular hypo- or hypervolemia. 4. There is merely a sharp increase in the Pulsoximeter when the temperature decreases. The Pulsoximeter still indicates the correct saturation as long as the peripheral pulse rate corresponds to the heart rate on the ECG Monitor.

Aged↗

PubMed1986

[Gamma-aminobutyric acid concentrations in the plasma in unconscious patients with severe craniocerebral trauma or nontraumatic intracranial hemorrhage].

The detection of cerebral lesions by chemical laboratory studies has not as yet been possible. Tests were carried out to determine whether there was an increase in plasma concentration of the neurotransmitter gamma-aminobutyric acid (GABA) in 12 unconscious patients: 6 with severe craniocerebral trauma (CCT) and 6 with spontaneous intracranial hemorrhage. Normal plasma concentrations were detected in the central venous blood of patients with severe CCT (normal range 366 +/- 123 pmol/ml); in patients with intracranial hemorrhage the values were partially elevated. Maximal values in arterial blood were around 613 pmol/ml (patients with CCT) and 1723 pmol/ml (patients with spontaneous intracranial hemorrhage). The influence of fluid turnover on plasma GABA concentrations is discussed.

Adult↗