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Biomedical subjects

J Gresser

Publications and source records attributed to J Gresser.

8 recordsLinked to original sources
PubMed1997

Changes in EEG power density during sleep laboratory adaptation.

First- and second-night effects on the electroencephalogram (EEG) were investigated by means of polygraphic sleep recordings and all-night spectral analysis. Eighteen normal subjects were studied for three consecutive nights in a hospital sleep laboratory. Visual sleep scoring showed that there was a first-night effect in normal subjects similar to that reported previously [increased wakefulness; decreased total sleep time, sleep efficiency, and rapid eye movement (REM) sleep]. Spectral analysis of the sleep EEG revealed important changes, most of which occurred in REM sleep. Increased delta, theta, and beta1 power densities accompanied by decreased mean frequency were seen in REM sleep in the second night. On the basis of REM sleep deprivation results previously published, our data suggest that the second night could be affected by partial REM sleep deprivation that occurred in the first night. Delta and theta power density values decreased in the first non-rapid eye movement episode of nights 1 and 2; this could result from increased REM sleep pressure. The overall consistency of spectral data in the first and second night with REM sleep findings derived from visual scoring in the first night lends further support to this hypothesis. The sleep disturbance experienced during the first night in a sleep laboratory may be a useful and valid model of transient insomnia. Therefore, we conclude that data from all nights recorded should be included in assessing a subject's sleep.

Adult↗
PubMed1995

[Thoracoscopic surgery--experiences with a practical training course using an animal models].

Various thoracoscopic procedures have recently become an established method in thoracic surgery. However, a systematic teaching program is lacking. We present our experience with a 1-day training course, using anaesthetized pigs. Thoracoscopic operations, such as pericardial fenestration, wedge resection of the lung, subaortic and mediastinal lymph node dissection and pleurectomy have been exercised in groups of two. 7-12 months following the teaching course 40% of the participants had performed more than ten diagnostic or therapeutic thoracoscopic interventions in clinical situations. We conclude that our course helps participants to successfully apply this technique in clinical practice.

Animals↗
PubMed1992

[Bursitis iliopectinea--a rare differential diagnosis of painful inguinal swelling].

The syndrome of iliopectineal bursitis is an important differential diagnosis of a painful swelling in the inguinal region. Symptoms are local swelling and pain, radiation of pain along the femoral nerve, troubles of arterial or venous circulation and even dysuria or dysmenorrhoea in case the bursa penetrates into the pelvis. The diagnosis is established by conventional radiology (signs of osteoarthritis as one of the pathogenetic reasons), ultrasound (liquid mass lateral to the femoral vessels), punction (clear fluid, eventually synovial cells), contrast injection (dimension of the bursa and communication to the hip joint) and computed tomography (dimension, relation to hip and vessels). The treatment is the excision of the bursa, if conservative therapy is not successful. The excision requires tedious, cautious dissection because of the important structures adjacent and a possible communication to the hip joint must be eradicated.

Adult↗
PubMed1992

[Wound management].

The following article is a check-list for wound care giving some practical hints. Special interest has been given to the themes of local anesthesia and prevention of infections. The indications and limits of the ambulant wound care are also discussed. Finally, a short explanation is given for the treatment of wounds situated at delicate regions of the body.

Ambulatory Surgical Procedures↗
PubMed1991

A statistical evaluation of the main interpolation methods applied to 3-dimensional EEG mapping.

This paper is a review of the main interpolation methods applicable to 3-dimensional EEG mapping. The use of simple statistical comparison methods on recorded EEG maps allowed us to evaluate the qualities of interpolation methods belonging to 3 mathematical families (barycentric, polynomial, spline). A combination of a 3-dimensional representation of EEG maps and a reliable interpolation method makes it possible to obtain better spatial resolution than with standard planar mapping.

Brain Mapping↗
PubMed1989

The importance of oral sodium replacement in ileostomy patients.

The main function of the colon is fluid and sodium conservation. In ileostomy patients these colonic functions are lacking. The consequence is excessive loss of fluid and sodium, failure to thrive, and skin excoriation around the ileostomy. Patients with ileostomies require 6-10 mmol/kg sodium per day. With ordinary feeds, infants receive 2-4 mmol/kg sodium; therefore the sodium deficit may be estimated at 4-6 mmol/kg per day. Monitoring of adequate sodium substitution is best carried out by measuring the concentration of sodium in spot urine. Levels higher than 10 mmol/l sodium signify an adequate oral sodium intake. During the initial period of oral feeding, glucose excretion in the ileostomy fluid must be monitored, as glucose-positive ileostomy effluence necessitates additional sodium substitution in order to activate the sodium and glucose cotransport. Thirty neonates with ileostomies were followed-up retrospectively. All patients received a sodium substitution of at least 4-6 mmol/kg orally per day. The 30 patients had a total of 4769 ileostomy-days. All patients were successfully fed orally and most of them nursed at home until closure of the ileostomy.

Administration, Oral↗
PubMed1978

Anti-interferon globulin inhibits the development of glomerulonephritis in mice infected at birth with lymphocytic choriomeningitis virus.

Swiss mice infected at birth with lymphocytic choriomeningitis virus develop glomerulonephritis. Injection of potent anti-mouse interferon globulin at the time of viral infection inhibited the development of these renal lesions. We conclude that the production of endogenous interferon by this virus in the first few days of life plays an important role in the pathogenesis of this glomerulonephritis.

Animals↗