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Biomedical subjects

P Christ

Publications and source records attributed to P Christ.

11 recordsLinked to original sources
PubMed2004

High detection sensitivity achieved with cryogenic detectors in combination with matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry.

Cryogenic detectors directly measure the impact energy of any impinging particle independent of its velocity. Thus a very high, mass-independent, detection efficiency is expected from their application in TOF-MS. The cryogenic detector applied here is based on a superconducting phase-transition thermometer and was implemented in a dual reflector time-of-flight mass spectrometer (N-geometry). A dilution series using standard sample preparation procedures shows that the detection limit for insulin (Mr: 5,734) can be decreased by several orders of magnitude, down to 0.5 amol on the MALDI target. Detection limits for rhM-CSF beta (Mr: 49,032) and for polyclonal IgG (Mr: ca 150,000) in the high femtomole and low picomole range, respectively, were established.

Cold Temperature↗
PubMed1991

"Telemetric" electronystagmography: a new method for examination of nystagmus outside the clinic.

The diagnosis of the vestibular system is expanded by an newly developed system. It offers mainly two additional ways for the examination of eye movements: 1) Time and place independent, telemetric ENG recording by the patient himself. 2) Simultaneous visual examination of the nystagmus and ENG recording in clinic and surgery. The device contains of special, handy ENG recorder with digitalized storing of ENG curves. For easy application, special goggles with pre-installed electrodes have been combined with modified Frenzel's glasses. The recorded curves can be evaluated with the aid of a regular personal computer.

Electrodes↗
PubMed1991

Posture and central compensation after acoustic neurinoma surgery.

After acoustic neurinoma surgery via the enlarged middle cranial fossa approach the patients usually benefit from a good prognosis of the vestibular compensation, almost independent of the size of the tumour and of the patient's age, if the central vestibular pathways were not injured. Only 8% of the patients showed a reduced vestibular compensation. The success and gradation of the vestibular compensation in diseases with a permanent labyrinthine loss, even though after acoustic neurinoma surgery, can easily be classified by the so-called vestibular-index.

Adult↗
PubMed1990

Simultaneous palsy of facial and vestibular nerve in a child with Lyme borreliosis.

We describe a boy with borreliosis characterized by lymphocytic meningitis and simultaneous palsy of facial and vestibular nerves on the left side. A mild sensoneural affection was also confirmed by brainstem evoked response audiometry. While symptoms of vestibular dysfunction quickly decreased during antibiotic treatment, facial palsy improved only slowly.

Child↗
PubMed1990

[Diagnostic and treatment of lesions of the facial nerve after fractures of the temporal bone].

The authors review functional late results of 47 cases of facial palsies due to otobasal fracture by considering the clinical and electrophysiological test results, seen between 1983 and 1988. There were 36 longitudinal, 5 transversal and 6 combined temporal bone fractures. 5 patients suffered from a bilateral facial paralysis. In all cases, an electrodiagnostic examination was carried out in order to determine the pronosis and to indicate a surgical exploration. The electrodiagnostic consisted in electromyographie (EMG) and electroneuromyographie (ENoG). 36 patients got a medical treatment and 6 patients were treated by surgery. All facial nerve paralyses (n = 28), that were incomplete according to the clinical examination as well as the electrophysiological tests, received a medical treatment which lead to good functional late results without exception. 19 facial nerve paralyses seemed to be complete in clinical examination, but in 11 cases electrodiagnostic tests revealed a residual volontary electrical activity. This indicated a conservative therapy with 7 good (66%) and 4 (33%) fair results. So, no poor result had been found in this group. In the other 8 cases, 4 of which had a delayed onset of the paralysis, no electrocal activity could be proved. 4 patients were treated by surgery, and in 2 cases a complete facial nerve transection was found. The reconstruction of the facial nerve led to 1 good and to 1 satisfactory result. In the other 2 cases, the decompression lead to 1 good and to 1 poor late result. In these 4 cases the facial nerve had been completely decompressed, in a combined transmastoidal and enlarged transtemporal middle fossa approach.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1990

[Blindness caused by central artery occlusion following nasal septum correction].

Visual loss following intranasal injections is extremely rare. A case report of blindness in the only seeing eye after infiltration of the septal mucosa with local anaesthetics and vasopressin is presented. The pathological mechanism and the relationship between different surgical procedures and visual loss are analysed and discussed. Some rules are given to prevent this complication.

Adult↗