Biomedical subjects

Andreas Ch Gerber

Publications and source records attributed to Andreas Ch Gerber.

3 recordsLinked to original sources

PubMed2003

Video-optic cable endoscopy forceps.

We present a video-endoscopic technology for foreign body extractions with forceps. This can easily be followed and is recordable on video monitor in excellent quality. Instead of a rigid rod lens telescope, a fiberoptic video endoscope is inserted into the optical channel of a bronchoscopic forceps. This keeps the endoscopic device lightweight and easily maneuverable in different angles. The principle can be applied to other rigid diagnostic and therapeutic endoscopic equipment and represents a potential alternative technology to the use of cameras attached to rigid telescopes.

Endoscopes↗

PubMed2002

Flush volumes delivered from pressurized bag pump flush systems in neonates and small children.

BACKGROUND: The aim of this study was to measure the volumes of fluid delivered with a fast flush bolus from a flow regulating device. METHODS: In-vitro fast flush bolus volumes, the volumes delivered from a bag pump flush system while opening the flow regulating device for 1, 2 or 5 s, were gravimetrically measured through a 22-G and a 24-G cannula. In-vivo 1- and 2-s fast flush bolus volumes and the volume required to purge the tubing between stopcock and arterial cannula from visible blood after blood sampling were recorded in 12 anaesthetized neonates and infants (mean age 2.17 +/- 1.97 months, range 0.26-5.37 months) with a 24-G radial arterial cannula by continuously weighing the bag pump flush system at manometer pressures of 100, 200 and 300 mmHg. RESULTS: In-vitro fast flush bolus volumes ranged from 0.23 +/- 0.04 ml (1-s, 100 mmHg, 24-G cannula) to 2.95 +/- 0.38 ml (5-s, 300 mmHg, 22-G cannula). Volumes were larger using a 22-G cannula than a 24-G cannula (P < 0.01) and increased with longer flushing periods (P < 0.0001) and higher manometer pressures (P < 0.0001). In-vivo 1- and 2-s fast flush bolus volumes correlated well with driving pressures (infusion pressure minus mean arterial pressure) (r2 = 0.81/0.72). 1-s fast flush bolus volumes delivered (ml) were 0.0025 x mmHg driving pressure and 2-s fast flush bolus volumes delivered (ml) were 0.0043 x mmHg driving pressure. The mean volume delivered to purge blood from the arterial pressure tubing was 0.94 +/- 0.18 ml (range 0.61-1.34 ml). CONCLUSIONS: Fast bolus flushing from pressurized infusion bag systems, using the flow regulating device tested, can be applied during neonatal and paediatric anaesthesia without delivering uncontrolled amounts of fluid.

Analysis of Variance↗

PubMedDate not supplied

Intubation depth markings allow an improved positioning of endotracheal tubes in children.

OBJECTIVES: To evaluate the position of the new Microcuff pediatric tracheal tube, based upon intubation depth markings. METHODS: With Institutional Ethics Committee approval and informed parental consent, we included patients from birth (> or = 3 kg) to 16 yr undergoing interventional cardiac catheterization requiring general anesthesia with orotracheal intubation. The intubation depth mark of the tracheal tube was placed between the vocal cords by direct laryngoscopy. The distance between tube tip and tracheal carina was measured from routinely taken cardiac catheterization posterior-anterior x-ray computer images with the patient supine and the head in a neutral position. Evaluation was performed for 20 tubes size 3.0 mm internal diameter (ID) and for ten tubes of each size from 3.5 to 7.0 mm ID. RESULTS: 100 patients were studied (47 girls; 53 boys). Tracheal tube tip advancement into the trachea ranged from 40.6% to 68.6% (median 51.4%). The shortest distance from tube tip to the tracheal carina was 15.7 mm using a 3.0 mm ID tube. Using a standard formula for tube insertion in children aged > or = two years [12 cm + (age/2)], in one patient the tube tip would have been below the carina and in seven patients the tube cuffs would have been placed within the larynx. CONCLUSIONS: The intubation depth markings of the new Microcuff pediatric tracheal tube allow safe placement of the tracheal tube with a cuff-free laryngeal zone without the risk for endobronchial intubation. Placement using the intubation depth markings was superior to predicted insertion using a standard formula.

Adolescent↗