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Biomedical subjects

H Y Arandia

Publications and source records attributed to H Y Arandia.

10 recordsLinked to original sources
PubMed1981

PEEP and the Bain circuit.

The feasibility of applying positive end expiratory pressure within the Bain circuit using an Emerson PEEP valve was studied. It was determined that varying degrees of PEEP may be applied within the Bain circuit using an Emerson PEEP valve during either mechanically or manually controlled ventilation but not during spontaneous breathing. There was some loss of measured tidal volume with increasing PEEP, due primarily to compression gas losses but also from leakage throughout the system. The maximum gas loss was 100 ml per minute at PEEP 15 cm H2O under test conditions. PEEP may be applied between the Bain tubing and the manifold. However, one should then never allow the patient to breathe spontaneously as the PEEP valve presents an obstruction to inspiratory flow. With the PEEP valve relocated between the Bain manifold and the ventilator hose it was found that application of PEEP was possible without this disadvantage, but only during mechanical ventilation.

Anesthesiology↗
PubMed1980

Bain PEEP.

Explore the source record for details and available documents.

Humans↗
PubMed1980

Comparison of the incidence of combined "risk factors" for gastric acid aspiration: influence of two anesthetic techniques.

Gastric fluid pH and volume were studied on induction of anesthesia, during maintenance and at the end of the anesthesia in 50 elective surgical patients. All the patients were premedicated with meperidine, 1 mg/kg, and atropine 0.006 mg/kg, administered intramuscularly 45 minutes before induction of anesthesia. Half of the patients had incremental doses of meperidine; the other half had enflurane 1% to 2%; all had 70% nitrous oxide in oxygen during anesthesia maintenance. The incidence of a gastric fluid pH below 2.5 was 68% at the time of induction of anesthesia, 30% after 1 hour anesthesia, and 60% at the end of anesthesia. The incidence of a combination of pH below 2.5 and a volume above 25 ml was 30% on induction and 50% at the end of the anesthetic. There was no difference between the results in the two groups. It was concluded that although there was a decrease of gastric acidity during the anesthetic, the incidence of risk factors for aspiration pneumonitis at the end of the operation is at least as great as that on induction. Emptying the stomach before extubation may decrease this risk.

Anesthesia↗