Deadspace in Paediatric Anaesthetic Apparatus

Voß, Tatjana

doi:10.1093/bja/35.8.454

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…This was almost identical with the arrangement described by Voss (1963) for the investigation of the deadspace in some types of apparatus for paediatric anaesthesia. A closely similar experimental procedure was followed.…”

supporting

confidence: 65%

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The Effect of the Respiratory Flow Pattern on Rebreathing in a T-Piece System

Harrison¹

1964

British Journal of Anaesthesia

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The effect of the respiratory flow pattern on the fresh gas flow required to prevent rebreathing in a T-piece system was investigated using laboratory models. With a sine wave pattern slighdy less than 2\ times the minute volume was necessary. Widi the flow patterns produced by the ventilators studied, up to 3 times the minute volume was required. It is suggested that during artificial ventilation with certain flow patterns higher fresh gas flows may be required.

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supporting

confidence: 65%

“…The total deadspace at each fresh gas flow was calculated from the following formula, which was employed by Voss (1963)…”

mentioning

confidence: 99%

The Effect of the Respiratory Flow Pattern on Rebreathing in a T-Piece System

Harrison¹

1964

British Journal of Anaesthesia

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“…Clappison and Hamilton (1956), showed that increasing the dead space in normal unmedicated subjects led to increase in tidal volume and rate which were not sufficient to correct end-expiratory CO2 tension. The problem of apparatus dead space in paediatric anaesthetic apparatus has been well summarised 'by Voss '(1963) in an assessment of the Magill, Potter and Cape Town gas circuits applied to 'paediatric practice. The Cape Town system has been found to be the most suitable for small children and also has the virtue of extreme simplicity and versatility.…”

Section: Pulmonary Ventilationmentioning

confidence: 99%

“…The Cape Town system has been found to be the most suitable for small children and also has the virtue of extreme simplicity and versatility. This system, (Voss, 1963), was evolved in 1954 'at the Red Cross WarMemorial Children's 'Hospital and is used here as standard apparatus for neonates and small 6hildren. It consists of a standard angle piece with a tube of 6 mm.…”

Section: Pulmonary Ventilationmentioning

confidence: 99%

Some Special Considerations in Neonatal Anaesthesia

Bull

1966

Postgraduate Medical Journal

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“…This is the likely basis for the belief that the T‐piece is more suitable for small children and that systems such as the Magill attachment (Mapleson A system) are unsuitable for children below 20 kg body weight. Voss showed that using facemasks in inhalation anaesthesia for in children necessitated flushing out the mask using the fresh gas flow to decrease the dead space [1]. However, Ayre's T‐piece (later, the Jackson Rees modification) was introduced for children under the specific conditions of tracheal anaesthesia [2].…”

mentioning

confidence: 99%

Dead space and paediatric anaesthetic equipment: a physical lung model study*

2004

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SummaryUntested assumptions have been made with regard to functional dead space in facemasks, filters and breathing systems used in children for the administration of inhalation anaesthesia. Total functional dead space was measured in various combinations of this equipment applied to a spontaneous ventilation lung model with parameter settings appropriate for infants of 7-8 kg. We found that functional dead space was too large to allow for spontaneous ventilation of the lungs when a breathing filter was fitted. There was minimal relationship between size of the facemask and functional dead space; however, the provision of 22-mm female inlets to facemasks achieved proportionately less functional dead space than with 15-mm male inlets. Regardless of the apparatus used and the magnitude of the dead space, the leak induced when a poorly fitting facemask was used dramatically reduced the dead space of the breathing system -to near optimal conditions -by moving the alveolar gas elimination point to within the facemask itself.

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Deadspace in Paediatric Anaesthetic Apparatus

Cited by 9 publications

References 21 publications

The Effect of the Respiratory Flow Pattern on Rebreathing in a T-Piece System

The Effect of the Respiratory Flow Pattern on Rebreathing in a T-Piece System

Some Special Considerations in Neonatal Anaesthesia

Dead space and paediatric anaesthetic equipment: a physical lung model study*

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