The Effect of Intermittent Positive Pressure Breathing on the Lung Compliance and Intrapulmonary Mixing of Gases

Emerson, Peter A.; Torres, Gloria; Lyons, Harold A.

doi:10.1136/thx.15.2.124

Cited by 11 publications

(1 citation statement)

References 13 publications

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“…Uber 60 m m t t g t/iBt sich die HyperkapIfie oft nur dutch masehineUe Beatmung beheben, die eine kiinstliehe Hyperventflation, erhShte alveolare Vent~ation hervorzttrufen vermag, ohne die Respirations-t~tigkeit des Organ~mus zu steigern. Vielmehr wird dureh die Beltiftung der bei Spontanatmung hypoventilierten Gebiete die Ventilations-Perfusionsdisharmonie und die konsekutive StSrung im Gasaustauseh vermindert [4,32,17,18].…”

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Circulatory examinations during arteficial respiration of patients suffering from cardiorespiratory insufficiency

Hutás

Mihóczy

1969

Beitr. Klin. Tuberk.

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Electrocardiographic and mechanographi¢ examinations have been made before and just after axteficial respiration of 18 patients suffering from cardiorespiratory insufficiency of different severity, accompanied by obstructive respiratory disturbances. A decrease in overloading of the right heart has been denoted by the cardiogram of the right ventricle although declining indexes have been registered at 3 patients after treatment with respirator. Similarity has been observed in alterations of the cardiogram and the clinical s ~t u s . Zusamraen[assung. Bei 18 Patienten mit verschieden schwerer kardiorespiratorischer Insuffizienz kombinierten obstruktiven RespirationsstSrung wurden vor und unmittelbar nach maschineller Beatmung elektrokardiographische und mechanographische Untersuchungen durchgefiihrt. In den meisten Fallen zeigte alas Kardiogramm der rechten Kammer eine Abnahme der Uberlastung der rechten Herzh~tfte, bei drei Kranken verschlechterten sich jedoch die Indexe unter der Respirator-Behandlung. Der klinische Verlauf entspraeh der Gest~ltung des EKG-Bildes. Die Antoren verweisen alff die Notwendigkeit einer st~ndigen Kontrolle des Kreislaufes wKhrend der Behandlung der im Ansehlul] an RespirationsstSrtmg auftretenden kardiorespiratorischen Insuffizienz.

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Circulatory examinations during arteficial respiration of patients suffering from cardiorespiratory insufficiency

Hutás

Mihóczy

1969

Beitr. Klin. Tuberk.

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Treatment of Status Asthmaticus

Sheehy¹,

DiBenedetto²,

Lefrak³

et al. 1972

Arch Intern Med

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Respiratory volume-pressure relationships during anaesthesia

Waltemath¹,

Bergman²,

Preuss³

1973

Canad. Anaesth. Soc. J.

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RESPIRATORY VOLUME-PRESSURE RELATIONSHIPS (AV/AP) are quantified in terms of compliance. The effect of general anaesthesia on the compliance of the total respiratory system (lungs plus chest wall) remains in dispute. Most workers have reported a reduction in compliance during anaesthesia, i-s However, others have reported compliance to be increased, 9 or unchanged. 1°,11 One obstacle to the interpretation of these previous studies is that methods used to obtain control preanaesthetic measurements were different from those used in the anaesthetized subject. For example, measurements obtained by attempts at voluntary relaxation of respiratory muscles in conscious subjects have been compared with values obtained by passive inflation of the respiratory system in anaesthetized individuals. In this study, we have measured volume-pressure relationships for the total respiratory system in the conscious subject and again under several conditions following induction of general anaesthesia using identical methods under all circumstances. In addition, a new method for representation of respiratory volume-pressure data in logarithmic form is used to facilitate presentation, analysis and interpretation of results. METHODSRespiratory compliance was measured using the weighted spirometer technique of Cherniak and Brown} 2 The subjects of the study were 16 consenting adults scheduled for elective operations. All were free of systemic disease, did not smoke and ranged in age from 19 to 55 years. Seven were anaesthetized with halothane with oxygen and nine with neurolept-analgesia~ with oxygen.The experimental apparatus is represented in the diagram in Figure 1. All subjects were studied in the supine position and breathed either from a tightly fitting face mask or through a cuffed tracheal tube. Pressure within the airway relative to atmospheric was measured from the side-arm of the mask adapter using a Sanborn 270 transducer calibrated against a water manometer and recorded on a Sanborn 954 recorder. Respiratory volume changes were recorded on the spirometer kymograph (Collins, 9L). All volume changes were corrected for gas compression and water displacement in the spirometer circuit, and were converted to B.T.P.S.In the halothane group, the subjects were studied in the conscious state and

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The Effect of Intermittent Positive Pressure Breathing on the Lung Compliance and Intrapulmonary Mixing of Gases

Cited by 11 publications

References 13 publications

Circulatory examinations during arteficial respiration of patients suffering from cardiorespiratory insufficiency

Circulatory examinations during arteficial respiration of patients suffering from cardiorespiratory insufficiency

Treatment of Status Asthmaticus

Respiratory volume-pressure relationships during anaesthesia

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