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Biomedical subjects

K Walther

Publications and source records attributed to K Walther.

16 recordsLinked to original sources
PubMed1991

[Environmental problems in dentistry].

The materials used to treat dental patients endanger the environment. The most important polluting materials are the heavy metals, in particular mercury. The sulphides are of lesser importance and the other chemically active and infected materials are almost harmless. The gathering and discharging of most of these materials, preferably by own initiative, does not pose any problems. The removal of amalgam from the sewage however, requires a specific apparatus.

Dental Amalgam↗
PubMed1989

[Technology and progress in the use of information systems in the dental office].

The numerous DP systems used in dental offices are designed for administrative work. Data storage and management is limited to accountancy applications, and the advantages of the flow of information are restricted to operational purposes. Data of medical use are available only to a moderate extent. It should be possible, however, to use these information systems for processing purely medical data, for the structured input of comprehensive diagnostic information, and to have these data available for specific decisions. The use of a "decision-supporting system" has been tested in the documentation of dental diagnostic findings.

Decision Trees↗
PubMed1988

Unreliability of oxygen tension-based indices in reflecting intrapulmonary shunting in critically ill patients.

Measurement of intrapulmonary shunting (Qsp/Qt), a widely used method for monitoring disturbances of pulmonary oxygen transfer in critically ill patients, involves calculation of arterial and mixed venous oxygen contents. In circumstances where mixed venous blood samples are not readily available, oxygen tension-based indices such as the alveolar to arterial oxygen tension differences (P[A-a]O2), arterial oxygen tension to alveolar oxygen tension ratio (PaO2/PAO2), PaO2 to FIO2 ratio (PaO2/FIO2) and respiratory index (RI) are widely utilized to reflect Qsp/Qt. Oxygen content-based indices such as the estimated shunt are not as widely utilized as the oxygen tension indices. In 75 critically ill patients in whom a pulmonary artery catheter was being utilized to augment clinical care, comparisons were made between Qsp/Qt and P(A-a)O2, PaO2/PAO2, PaO2/FIO2, RI, and estimated shunt to determine which index best reflected Qsp/Qt. Correlations between Qsp/Qt and estimated shunt were good (r = .94) and poor for the P(A-a)O2 (r = .62), PaO2/PAO2 (r = .72), PaO2/FIO2 (r = .71), and RI (r = .74). We conclude that there are no real substitutes for venous oxygen contents in critically ill patients. When pulmonary artery blood is not available for analysis, oxygen tension-based indices are unreliable reflectors of Qsp/Qt while the estimated shunt, an oxygen content-based index, provides a more reliable reflection of Qsp/Qt.

Aged↗
PubMed1977

[Treatment of a Morgagni-Adams-Stokes attack in hyperthyroidism by means of temporary electrostimulation].

The authors report on a 74-year-old female patient who revealed Adams-Stokes attacks and was supplied by an R-wave triggered external pacemaker. The patient showed intermittent total AV-block. A frequency of 26 beats was observed. Hypothyroidism was recognized as the cause of this disturbance of cardiac rhythm. After treatment with triiodothyronine the bradycardia disappeared and the external pacemaker could be removed. This case is reported for demonstrating a disturbance of the rhythm caused by hypothyroidism and which is successfully treated by temporary pacemaker and specific drug therapy.

Adams-Stokes Syndrome↗
PubMed1976

[Experiences in the use of the so-called M-mode method in the clinical diagnosis of heart diseases].

Since formerly only the diastolic phase of the curve of the mitral valve was in the centre of interest for diagnosing the mitral stenosis, nowadays the systolic area is more taken into consideration, the changes of which apart from the hypertrophies of the heart walls increasingly gains significance for the diagnostics of the idiopathic hypertrophic cardiomyopathies, the floppy valve syndrome, the aneurysm of the heart wall, the atrial septum defect as well as for systolic murmurs of different genesis. The registration of the movement of the posterior wall and the septum give the possibility of determination of the volume. Thus mean values of the stroke volume, the minute volume of the heart and the cardiac index showed a conspicuously good correspondence in persons with healthy heart compared with former determinations by dye dilution technique. As formerly (dye examinations) we found significant differences between normals and values of patients with mitral stenosis in stroke volume, ejection fraction, cardiac output and cardiac index, when we used the echocardiographic technique.

Cardiomyopathies↗
PubMed1975

[Changes in the munber of 60-year old and older internal patients during a period of 10 years].

In 273 persons, of them 76 with ischaemic heart disease, 46 with non-coronary heart diseases (vitia, hypertension, chronic cor pulmonale, cardiomyopathy) and a control group of 115 healthy persons, during and after submaximal load under bicycle ergometry the ECG after work was recorded, in which case indication and contraindications of the WHO were taken into consideration. Especially investigated were the degree and the morphology of the ST-T-changes in differential-diagnostic respect in ischaemic heart disease and functional disturbances of the repolarisation. Apart from this the disturbances of rhythm and conduction system were analysed, which appeared under stress. The highest diagnostic evidence was under a load of 400-600 kmp/min and a pulse rate of 130-150/mim.

Adult↗