Study of the time displacement between the airflow and box-pressure curves in the body-plethysmograph

1967 ◽  
Vol 5 (5) ◽  
pp. 481-487 ◽  
Author(s):  
Keijiro Nitta ◽  
Masaji Mochizuki
Keyword(s):  
The Body ◽  
Body Plethysmograph

A VALVE FOR RESPIRATORY STUDIES IN INFANTS

PEDIATRICS ◽  
1961 ◽  
Vol 27 (4) ◽  
pp. 645-647
Author(s):  
Richard J. Golinko ◽  
Abraham M. Rudolph
Keyword(s):  
Dead Space ◽  
Newborn Infants ◽  
Dilution Effect ◽  
Face Mask ◽  
The Body ◽  
Large Head ◽  
The Face ◽  
Residual Capacity ◽  
Respiratory Valve ◽  
Body Plethysmograph

PULMONARY function studies in small infants have been limited in the past by failure to develop practical methods for collecting expired gas samples. Adaption of a respiratory valve suitable for use in small subjects with small tidal volumes has been difficult and has led to the use of techniques with the body plethysmograph, contour face mask and large head chamber. The body plethysmograph offers only indirect data and requires considerable prepration before each study. In addition, it has the disadvantage that once the infant is placed in the plethysmograph chamber further manipulations of the infant are not possible. Systems using the contour face mask on head chamber involve a large dead space which may be quite significant when one considers the small volumes dealt with. In order to overcome the problem of large dead space, Cayler et al., similar to others, circulated air across the face of the contour mask. However, because of the dilution effect, differences in the composition of the inspired and expired gases were very small and therefore the chance for error in the calculations was increased. Berglund and Karlberg, and Geubelle et al., while studying functional residual capacity in infants, found that practically all quiet, healthy newborn infants breathe through the nose and can also tolerate the insertion of small tubes in their nostrils for varying periods. On the basis of these observations, a respiratory valve has been designed for insertion directly into the nostrils, permitting collection of total expired air. The valve, especially adapted for use in small infants, offers minimal resistance to respiration and has a dead space of 0.8 ml.

scholarly journals The Body Plethysmograph

1961 ◽  
Vol 37 (427) ◽  
pp. 257-258 ◽  
Author(s):  
G. Cumming
Keyword(s):  
The Body ◽  
Body Plethysmograph

A new electropneumatic flowmeter for the body plethysmograph.

1967 ◽  
Vol 23 (2) ◽  
pp. 276-278 ◽  
Author(s):  
N B Karatzas ◽  
G D Lee ◽  
F D Stott
Keyword(s):  
The Body ◽  
Body Plethysmograph

scholarly journals MECHANICAL EFFECTS OF THE HEART BEAT ON THE PRESSURE IN THE BODY PLETHYSMOGRAPH

Heart ◽  
1965 ◽  
Vol 27 (4) ◽  
pp. 527-539 ◽  
Author(s):  
R. J. Mills ◽  
P. Harris
Keyword(s):  
Heart Beat ◽  
The Body ◽  
Mechanical Effects ◽  
Body Plethysmograph

A bag-in-box system for maintaining gases at body temperature within the body plethysmograph

1964 ◽  
Vol 19 (3) ◽  
pp. 534-535 ◽  
Author(s):  
Marvin A. Sackner ◽  
Khalil A. Feisal ◽  
Arthur B. DuBois
Keyword(s):  
Body Temperature ◽  
Dead Space ◽  
The Body ◽  
Pulmonary Tissue ◽  
Tissue Volume ◽  
Pulmonary Tissue Volume ◽  
Body Plethysmograph

Measurements of the tissue volume and CO2 dissociation slope of the lungs by a plethysmographic technique require maintenance of the inspired gases at body temperature and saturation with water. For such a purpose, the design of a thermostatically controlled bag-in-box system which introduces negligible dead space between the mouth and bags is described. apparatus for measurement of pulmonary tissue volume; bag-in-box system with negligible dead space; thermostatically controlled bag-in-box system Submitted on August 26, 1963

Ventilation by high-frequency oscillation of thorax or at trachea in rats

1984 ◽  
Vol 56 (1) ◽  
pp. 155-160 ◽  
Author(s):  
A. Harf ◽  
C. Bertrand ◽  
H. K. Chang
Keyword(s):  
Partial Pressure ◽  
High Frequency ◽  
The Body ◽  
Whole Body ◽  
High Frequency Oscillation ◽  
Frequency Oscillation ◽  
Co2 Partial Pressure ◽  
Tracheal Cannula ◽  
O2 Partial Pressure ◽  
Body Plethysmograph

The efficiency of ventilation by high-frequency oscillation (HFO) applied to the thorax (external HFO) has been compared with that of HFO applied through a tracheal cannula (internal HFO) in a group of normal rats. Anesthetized, paralyzed, tracheotomized rats were placed in a whole-body plethysmograph. External HFO was achieved by varying the pressure surrounding the animal by means of a piston pump connected to the body plethysmograph; internal HFO was obtained in the same animals by connecting the pump to the tracheal cannula. Arterial CO2 and O2 partial pressures were measured in blood sampled from a carotid artery and were compared for external and internal HFO applied at 20 Hz with matched tidal volumes of 0.8, 1.4, 1.9, and 2.4 ml/kg. With increasing tidal volume, the mean arterial CO2 partial pressure decreased progressively from 68 to 30 Torr and was identical in the two modes of HFO; no difference was noted for the CO2 elimination or for the arterial O2 partial pressure. These results indicate that, in terms of gas exchange, external and internal HFO are equally efficient in normal rats.

scholarly journals An alternative way to measure total lung capacity: a pilot study

2020 ◽  
Vol 6 (3) ◽  
pp. 241-245
Author(s):  
Bernhard Laufer ◽  
Sabine Krueger-Ziolek ◽  
Knut Moeller ◽  
Paul D. Docherty ◽  
Fabian Hoeflinger ◽  
...  
Keyword(s):  
Pilot Study ◽  
Total Lung Capacity ◽  
The Body ◽  
Lung Capacity ◽  
Mouth Pressure ◽  
Alternative Approach ◽  
Small Tube ◽  
Helium Dilution ◽  
Capacity Determination ◽  
Body Plethysmograph

AbstractTotal lung capacity is usually measured by a body plethysmograph or helium dilution methods. In this study an alternative approach to obtain total lung capacity of spontaneous breathing subjects is introduced. The device utilises an optoelectronic plethysmograph and a small tube, which measures mouth pressure and allows total lung capacity to be obtained, which differs less than 0.4 L from the total lung capacity of the body plethysmograph. The method shows potential to be a less burdensome method to estimate total lung capacity determination than the body plethysmograph.

An Improved Device for Posterior Rhinomanometry to Measure Nasal Resistance

2005 ◽  
Vol 127 (6) ◽  
pp. 994-997 ◽  
Author(s):  
Joseph Tiran ◽  
Nir Ben-Oved ◽  
Elan Elvaiah ◽  
Youval Slovik ◽  
Alberto Leiberman ◽  
...  
Keyword(s):  
Phase Shift ◽  
Air Flow ◽  
Objective Evaluation ◽  
The Body ◽  
Pressure Differential ◽  
Nasal Resistance ◽  
Nasal Patency ◽  
Body Plethysmograph

Rhinomanometry is a method for measuring nasal resistance for the purpose of providing an objective evaluation of nasal patency. Posterior rhinomanometry is accomplished without the use of a mask, thus allowing the patient to breathe naturally. Here, we report on the improvements we have made to the existing posterior rhinomanometry system. In this system, nasal air flow is measured indirectly by measuring the pressure differential across a small mesh window in the body plethysmograph. We have calibrated this measurement and developed software that automatically provides the correct values for all airflow rates. Also, we have developed software that automatically corrects for the phase shift caused by the plethysmograph structure. These refinements should provide more accurate values for nasal resistance.

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