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At least 109 records · Page 6Linked to original sources
PubMed1992

[Intraoperative monitoring with transtympanic electrocochleography].

Transtympanic electrocochleography (ECoG) enables auditory evoked potentials to be recorded directly from the peripheral organ, and ECoG recordings can be used as a routine during operations. Examples of cochlear and eighth nerve monitoring in middle ear, inner ear, and cerebellopontine angle surgery are given. This monitoring tool provides a continuous feedback to the surgeon of the effects of the operation on the cochlea and the auditory pathway.

Acoustic Stimulation↗
PubMedDate not supplied

[Intraoperative monitoring of the EEG in patients with arterial aneurysms of the cerebral vessels].

Visual EEG monitoring and EEG monitoring using a special "Neuro-2" monitor controlling the changes in quantitative EEG parameters (power range and coherence) have been used during surgery in 42 patients with arterial aneurysms of brain vessels performed in conditions of profound controlled arterial hypotension. Computer processing facilitates EEG analysis and reveals the most early signs of the developing cerebral ischemia on the basis of specific changes in power ranges and coherence.

Adult↗
PubMed1995

Intraoperative monitoring of intracranial pressure in five dogs with space-occupying intracranial lesions.

Five dogs with space-occupying intracranial lesions underwent lateral craniectomy. Brain tissue pressures, reflective of intracranial pressure, were monitored during the surgical procedure, using a fiberoptic intracranial pressure monitoring system. The intracranial pressure monitoring cable was placed superficially in brain parenchyma on the side contralateral to the primary lesion. Recordings were made continually throughout the surgical procedure. Each dog was treated preoperatively with mannitol, which caused a decrease in intracranial pressure prior to craniectomy in only those dogs that initially had high intracranial pressure. Complications associated with use of the fiberoptic intracranial monitoring system were not evident. Although absolute values for pressure varied, pressure trends were helpful in determining effects of surgical manipulations on intracranial pressure in these dogs.

Animals↗
PubMed1993

[Intraoperative monitoring of abdominal organs under combined general anesthesia].

The authors analyse the early components of somatosensory evoked potentials (SSEP) during anesthesia in prolonged and traumatic operations on the abdominal organs (gastrectomy, hemihepatectomy, pancreatoduodenal resection, etc.). A total of 69 patients were examined, among them 32 underwent operations under conditions of classical NLA, 16 with the narcotic analgetics replaced by moradol, and 21 under modified NLA with dalargin. The results of the study and analysis of literature data allow monitoring of the early components of somatosensory evoked potentials to be considered a highly sensitive test for appraising the depth and adequacy of the modern methods of general anesthesia and to be recommended for use, at least in particularly difficult and venturesome operations. It is shown that most significant in the discussed plan is not the absolute value, but changes of the N19-P23 amplitude in the stages of the operation. Increase of the studied SSEP component by 20% and more in relation to the basal level (SSEP amplitude in the patient after adequate preanesthesia) is evidence of insufficient analgesia. Change of N19-P23 latency is less demonstrative. Monitoring of the early components (N19-P23) of SSEP showed that to ensure effective analgesia in prolonged concurrent and combined operations, if the NLA method is chosen, administration of fentanyl in a dose of no less than 12 micrograms/kg/hour is necessary. It is shown that replacement of narcotic analgesics, within the limits of the conducted NLA, by moradol, an agent of the group of agonists-antagonists is poorly effective.(ABSTRACT TRUNCATED AT 250 WORDS)

Abdomen↗
PubMed1996

[Comparison of 2 systems for continuous intraoperative monitoring of oxygen saturation in the jugular bulb].

OBJECTIVE: To compare accuracy, precision and stability of two jugular venous blood catheters for continuous monitoring of oxygen saturation during surgery, in a nonrandom, prospective sample. PATIENTS AND METHODS: We studied 47 patients requiring continuous monitoring of SjvO2 during a variety of neurosurgical procedures. Swan-Ganz pediatric 5.5F catheters (Opticath P575-EH) were used in 27 patients; neonatal umbilical artery 4F catheters (Opticath U425C) were used in 20. Both catheters were equipped with a fiberoptic system for continuous monitoring of hemoglobin oxygen saturation. After checking correct placement, readings transmitted were compared with co-oximetry readings for a sample taken from the distal end of the catheter. We also compared time spent placing the catheters and stability of SjvO2 reading during surgery. RESULTS: Insertion time (+/- SD) was 10.3 +/- 2.5 minutes for the 4F catheter and 15.9 +/- 5.5 minutes for the 5.5F model (p < 0.01). Although both systems tended to overestimate, the 5.5F catheters were more accurate: the mean differences were -6.8% for the 4F catheter and -1.2% for the 5.5F. These results made it necessary to calibrate the 4F catheters after placement and before use, a procedure not needed if the 5.5F catheters are used. Stability of SjvO2 readings during surgery was significantly greater (p < 0.01) for the 5.5F catheters, such that only 25.9% were considered clinically useful based on this parameter. However, 70% of the 5.5F catheters provided acceptable SjvO2 readings. Intracranial pressure during insertion and removal of the SjvO2 catheters was measured in only 5 patients; there were no changes greater than 1 mmHg. CONCLUSIONS: Although the 5.5F pediatric catheters take longer to put into position, their greater accuracy, precision and stability makes them preferable to the 4F catheters for continuous monitoring of SjvO2. Long-term vascular effects must be studied further.

Adult↗