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Biomedical subjects

J Sturm

Publications and source records attributed to J Sturm.

At least 73 records · Page 4Linked to original sources
PubMed1985

Doppler frequency spectrum analysis and digital subtraction angiography in carotid artery disease.

The aim of the study was to evaluate the diagnostic accuracy of frequency spectrum analysis complementary to direct Doppler sonography in comparison to conventional biplane arteriography and transvenous digital subtraction angiography in internal carotid artery stenosis. In a group consisting of 229 carotid arteries visualized by conventional biplane arteriography, Doppler frequency spectrum analysis had a specificity of 97% and concerning all stenoses and occlusions, a sensitivity of 89%. In a second group consisting of 198 carotid arteries imaged by transvenous digital subtraction angiography, Doppler sonographic examination had a specificity of 65% only, and concerning all categories of stenoses and occlusions a sensitivity of 85%. These differences concerning specificity are not interpreted as false positive diagnoses in Doppler spectrum analysis but are considered to be due to false negative findings of digital subtraction angiography in stenoses of less than 50% vessel diameter reduction.

Carotid Artery Diseases↗
PubMed1984

Quantification of regional extravascular lung water in dogs with positron emission tomography, using constant infusion of 15O-labeled water.

Continuous infusion of 15O-labeled water allows a quantitative measurement of the total water pool in the chest region by positron emission tomography (PET). By subsequent inhalation of 11CO the intravascular space (blood pool) can be quantitated as well. After a suitable normalization of the intravascular activities the extravascular water can be determined by subtraction of the blood pool from the water pool. The regional extravascular lung water distribution can be visualized in tomographic slices. The method was validated in an animal experiment using five dogs. They were measured before and after induction of a lung edema by IV injection of oleic acid. The increase of extravascular lung water was monitored by the thermo-dye-dilution method (TDD). The correlation of extravascular lung water as measured by TDD with PET measurements is good (r = 0.94). The PET values agree also with gravimetric lung water determinations. An absolute quantitation of regional extravascular lung water is possible after absorption correction of the PET data via transmission measurements and calibration of the camera system. The uncertainty in the absolute quantification is +/- 20%. In the experiments described here the mean extravascular lung water was 0.13 g/cm3 before and 0.25 g/cm3 after induction of lung edema.

Animals↗
PubMed1983

[Quantitative measurements of regional extra-vascular lung water in dogs using positron emission tomography].

A new method for quantifying regional variations in extravascular lung water (rELW) has been developed. The positron source 15O (T1/2 = 2.0 min.) was provided as H215O 'on line' by constant intravenous injection. Tomographic images (PET) of the water distribution were obtained during equilibrium. The distribution of blood volume was obtained by marking erythrocytes (carboxyhaemoglobin) using a bolus inhalation [C-11)-CO; T1/2 = 20.4 min). Absorption is calculated from transmission tomography. The rELW is defined as: total lung water minus intravascular space. The method was carried out in five intubated and anaesthetised dogs before and after induction of pulmonary oedema with oleic acid (0.06 ml./kg.). Mean ELW (PET) rose from 0.13 +/- 0.02 g./cm.3 to 0.24 +/- 0.04 g./cm.3. There was good correlation with a simultaneously performed thermo-dye method (7.1 +/- 1.3 ml./kg. KG to 13.3 +/- 1.9 ml./kg. KG; r = 0.94). Gravimetric estimations resulted in 13.7 +/- 2.6 ml./kg. KG. The development and distribution of the pulmonary oedema was non-homogeneous and varied regionally.

Animals↗
PubMed1981

[Treatment of the polytraumatic shock (author's transl)].

The survival rate of patients with multiple injuries can be improved by means of the modern possibilities of rescue services. The timespan preceding treatment can be shortened. A consequent symptomatic treatment of hemodynamic and respiratory disorders plays an important role. A causal therapy of the impaired permeability of the capillaries, which causes the shock, is possible only to some extent. The therapy should concentrate on the solution resulting from shock.

Blood Transfusion↗
PubMed1979

Cardiorespiratory and metabolic patterns in multiple trauma patients.

During the last 3 years we have performed a detailed study in 50 patients using the Swan-Ganz catheter to provide prognostic haemodynamic and metabolic values at an early stage. There was a total of 320 severe injuries in these 50 patients with a statistical mean of six to seven. The severity of injuries is documented by the volume replacement necessary within the first 24 hr. On average more than 8 litres of whole blood, albumin and dextran were given intravenously. Out of 50 patients, 28 survived. During the first 2h there was a significant difference between survivor and non-survivor in systolic blood pressure and shock index. From the very beginning the surviving patients demonstrated a higher cardiac index than non-survivors. Pulmonary artery pressure and total pulmonary resistance were also elevated from the very beginning. The right ventricular stroke work index was increased; the left ventricular stroke work index was decreased in the group of non-survivors. The arteriovenous oxygen content difference as well as oxygen extraction ratio was elevated, and the oxygen availability was decreased in the group of the non-surviving patients. Of the metabolic parameters, an increase in the lactate/pyruvate ratio as well as in serum glucose and a decrease in base excess values permit an early prediction of a favourable outcome. There were significant differences in the enzymes SGOT, SGPT, LDH, CHE, as well as bilirubin concentrations between survivors and non-survivors from sixth day on.

Acid-Base Equilibrium↗
PubMed1978

The diagnosis of microscopic carcinoma of the esophagus.

Microscopic squamous cell carcinoma of the esophagus with early submucosal spread was diagnosed in two patients with hiatal hernia and evidence of esophageal reflux. The lesions were not suggestive of malignancy on endoscopic examination. Both patients are known to be alive more than one year after resection and presumably without recurrence. More liberal use of endoscopic brush cytology and biopsy or intubation cytology particularly in the cases at high risk, might substantially improve the chances of very early diagnosis and favorably alter the present grim mortality rate.

Biopsy↗
PubMed1978

[A new method for combined auto-alloplastic tooth reimplantation with a parallel A1203-ceramic root].

The operative procedure for partially replacing the root with A12O3 ceramic represents a good possibility for preserving teeth in which the pulpa is devitalized. The method used in connection with the well known autoplastic reimplantation not only presents an alternative to the traditional apicoectomy but also provides additional stabilization of the tooth by lengthing the root with cocotostabile and biocompatible A1203 ceramic. The method was tested in humans and monkeys. Argumentation was based on histological examination via light microscopy.

Aluminum Oxide↗