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W Friesdorf

Publications and source records attributed to W Friesdorf.

26 records · Page 2Linked to original sources
PubMed1990

[Analysis of data management in anesthesia from an ergonomic viewpoint].

In the perioperative phase the anesthetist has to manage an increasing amount of knowledge, information and data. Using a system-ergonomic approach we can define three types of data management (DM): Exploratory DM, Operative DM, Concluding DM. The preliminary examination of the patient is Exploratory DM. Data are collected and recorded. Here, a well structured form prevents things being forgotten, provides forgetting anything. Help from electronic devices is not available. Control of anaesthesia is based on Operative DM. The anesthetist is part of an ongoing process. He investigates and records a situation based on his knowledge and experience and a prompt reaction to untoward circumstances may be necessary. Today's workplace provides insufficient support for this task. Data presentation is unstructured and distributed around the workplace which produces potentially dangerous overloading in critical situations. It is necessary to view the work layout as an integrated whole. The data being displayed must be hierarchically structured and appropriate to the situation. Concluding DM involves summarising data and information on completion of a process in ways appropriate to specific purposes. With this the anesthetist completes an anaesthesia and transfers the patient to the next unit, e.g. to the recovery room. He has to fill in several forms for clinical and statistical reasons. Electronic aids are available only for parts of some tasks. The goal should be a multifunctional summary satisfactory for clinical and statistical purposes, most aspects of which are created automatically by a computer system.

Anesthesiology↗
PubMed1989

[Improvement of oxygenation in thoracic surgery with one-lung ventilation using a new intraoperative CPAP device].

For thoracic surgery with one-lung ventilation, the use of CPAP for the non-ventilated lung can improve oxygenation. We studied the use of a newly developed CPAP device in 28 patients undergoing single-lung ventilation. This device was easy to use, in particular because the components are familiar to every anesthesiologist. The use of +5 mbar CPAP improved oxygenation by an average of 39.5 mm Hg; +10 mbar CPAP brought about an improvement of 89 mm Hg. Pulse oximetry proved useful in monitoring adequate oxygenation.

Humans↗
PubMed1987

[Future working conditions of anesthesiologists. Attempt at an analysis].

The present conditions of the anaesthesiologist's workplace are characterized by completely unacceptable circumstances, incompatibilities, inflexibility and unsafeness. Like inadequate cockpit conditions in airplanes, these workplace conditions pose considerable risks to the safety of patients and personnel. Taking into consideration the literature and our own views, we have proposed some changes which are essential for improving the working conditions of anesthesiologists: Ergonomic improvements of the anaesthesiological workplace in order to facilitate the anesthetist's performance, to provide him with adequate space, and to automatize repeated and relatively unimportant activities. Vital information about the patient's condition must be located in a position where they will dominate the anesthetist's attention. Information about medications, infusions, transfusions, etc. can be located on the left-hand side of the anesthetist. All other devices can be located beside the anesthetist or even behind him, as they are of minor importance. The most useful alternative to the present conditions would be to locate the information panels of primary and secondary monitoring devices to the immediate right, or on the right- und left-hand sides of the anesthetist at an angle of 15 degrees-30 degrees each. Furthermore, these information panels should be arranged so that they can be monitored using moving and slightly tilted screens. The most important of the patients, clinical parameters as well as the functions of the equipment should be monitored by alarms, warning devices, or simply indicators, which can easily be separated.(ABSTRACT TRUNCATED AT 250 WORDS)

Anesthesiology↗
PubMed1986

[Pharmacodynamics of vecuronium in infants during intravenous induction of anesthesia with ketamine].

The pharmacodynamic effects of vecuronium in children aged 1 to 6 years were investigated after intravenous induction of anaesthesia with ketamine, using an initial dose of vecuronium of 0.08 mg/kg body wt. 0.1 mg/kg body wt. The degree of neuromuscular blockade was determined by measuring the contraction force of the m. adductor pollicis after supramaximal stimulation of the ulnar nerve using an electromechanical device. The results (median, chi min and chi max) were as follows. For the initial dose 0.08 mg/kg body wt., the onset time was 150 s (110-360 s); total blockade: 5 of 9 children, D25 (duration of 25% recovery) 13 min (10-31); RI (recovery index): 8.5 min (6.0-14.5); D90 (duration of 90% recovery): 27 min (20-44). For the initial dose of 0.1 mg/kg body wt., the onset time was 135 s (80-300); total blockade: all children, D25: 19.5 min (12-32.5); RI: 8.75 min (6.5-13.5); D90 35 min (22-45). Only the D25 was significantly shorter using an initial dose of 0.08 mg/kg body wt. For a total blockade, a higher dose of vecuronium is necessary using intravenous induction of anaesthesia compared with previously described inhalation techniques. Even with the high dosage, recovery from neuromuscular blockade is so rapid in this age group that it can be used even for short operations without reversal.

Anesthesia, Intravenous↗