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R Treffers

Publications and source records attributed to R Treffers.

6 recordsLinked to original sources
PubMed2005

Lick Observatory Optical SETI: targeted search and new directions.

Lick Observatory's Optical SETI (search for extraterrestrial intelligence) program has been in regular operation for 4.5 years. We have observed 4,605 stars of spectral types F-M within 200 light-years of Earth. Occasionally, we have appended objects of special interest, such as stars with known planetary systems. We have observed 14 candidate signals ("triple coincidences"), all but one of which are explained by transient local difficulties. Additional observations of the remaining candidate have failed to confirm arriving pulse events. We now plan to proceed in a more economical manner by operating in an unattended drift scan mode. Between operational and equipment modifications, efficiency will more than double.

Astronomical Phenomena↗
PubMed1991

[The usefulness of thoracic computerized tomography in patients in an intensive care unit].

Performing thoracic CT scanning in critically ill patients can be cumbersome and may have detrimental effects on the condition of the patient. We retrospectively analysed the clinical data of 46 patients who were examined over a period of 4.5 years. The thoracic CT scanning was judged useful in 40 patients (87%) and beneficial for 23 (50%) of these. The principal indications for the investigation are: suspected pulmonary abscess, suspected mediastinitis, precise localisation of an intrathoracic lesion prior to surgery, difficulty in the evaluation of the pulmonary parenchyma in patients with deforming thoracic kyphoscoliosis, suspected trapped pleural fluid and a suspected thoracic focus of sepsis. Transport had no detrimental effects on any of the patients. If the decision to undertake CT scanning is arrived at jointly by the radiologist and intensive care physicians, CT scanning is useful and can be performed safely if transport is undertaken by an experienced team.

Aged↗
PubMed1989

An unusual case of cuff herniation.

We describe a case of herniation of an endotracheal tube with a high volume and low pressure cuff. In contrast with the conventional endotracheal tube with a low volume and high pressure cuff, which, after recognition of cuff herniation, can be deflated, the herniation of this type of tube could not be resolved in such a way. The large and soft cuff material had spread itself over the tube tip, as a result of the herniation and this was aggravated by deflation, making it impossible to adequately ventilate the patient. Pulse oximetry turned out to be a most helpful way of monitoring the seriousness of the situation, in which the patient was fully covered by sterile drapes.

Adult↗
PubMed1988

Effects of neostigmine, edrophonium, 4-aminopyridine and their combinations.

A study was carried out in the in-vitro rat phrenic nerve hemidiaphragm preparation to find a fast and strong working antagonist of non-depolarizing muscle relaxants. We studied neostigmine, edrophonium, 4-aminopyridine and their combinations from the cumulative concentration response curves of pancuronium. Neostigmine, edrophonium and 4-aminopyridine all antagonized the effect of pancuronium. Neostigmine and 4-aminopyridine did potentiate each other as did neostigmine and edrophonium. The combination of edrophonium and 4-aminopyridine showed less total effect than the addition of their individual effect. We conclude that the mechanisms of action of neostigmine and edrophonium are different.

4-Aminopyridine↗
PubMed1986

A patchy loco-regional hypalgesia due to subdural catheter placement.

We discuss a unique case of perforation of the dura mater, but not of the arachnoidea, by an epidural catheter. The injected test dose of the local anesthetic agent caused a partial subdural and a partial epidural hypalgesia. The exact position of the catheter and the distribution of the local anesthetic agent was confirmed by radiographic contrast material.

Aged↗