Ventilation Nomogram for the Newborn and Small Children to Be Used With the Engstrom Respirator

Section: Respiratorsmentioning

confidence: 99%

High‐frequency Positive‐pressure Ventilation by Endotracheal Insufflation

Jonzon

Öberg

Sedin

et al. 1971

“…The ratios for ventilation to perfusion, VD/VT, and the amount of venous admixture in five patients with mitral disease are plotted in figures 3 and 4 (Nos. 7,8,13,19,27).…”

Section: Physiological Dead Space and V1 Vt Ratiosmentioning

confidence: 99%

Dead Space, Compliance and Venous Admixture During Heart Surgery

Norlander

Bernhoff

Nordén

1969

Patients undergoing heart surgery usually constitute a group of poor-risk patients who merit special precautions relative to the management of anaesthesia. As previously reported, it has been found that pre-operative arterial oxygen tension values in this group of patients are considerably lower than those encountered in other patients of the same age (THUNG and NORLANDER (1966)%, MARTINEZ and NORLANDER (1968)84). It is also well documented that many heart patients show impressive pathological changes in lung function, which increase the risks of postoperative pulmonary complications (DAMMA" From the Department of Anaesthesia (Head: 0. P. NORLANDER),

“…As there is left in the compressible volume a fraction of the ventilation volume corresponding to the plateau pressure, there is a discrepancy between the volume set on the respirator and that actually reaching the lungs. A method for the calculation of this volume is given by ENGSTROM et al (1959), ENGSTROM et al (1962, KOBBINS et al (1967), OKMIAN (1963( ) & HEDENSTIERNA (1972.…”

Section: Discussionmentioning

confidence: 99%

“…In this connection, however, the capacity-discharge characteristic is largely lost and the plateau becomes in fact a true static period. In the present paper, the influence of the internal (ENGSTROM et al 1962, OKMIAN 1966compliance (C,) on the intrapulmonal redistribution has been investigated on the basis of measurements on the lung-model, when used with a newly developed respirator (Engstrom Care System ECS 2000, Jungner Instrument AB, Sweden) with electronically-controlled pneumatics. The significance of the obtained results was verified by mathematical calculations.…”

mentioning

confidence: 99%

The Influence of the Internal Compliance of a Respirator on the Alveolar Gas Distribution

Meier

Baum

1976

The occurrence of intrapulmonary redistribution "pendelluft" during the plateau phase of a respirator, with and without internal compliance, was studied in a lung-model which simulated an obstructive inhomogeneity. Internal compliance was achieved by adding a flask, with a variable volume, to the patient circuit of a respirator which had a low compressible volume (Engstrom Care System ECS 2000, Jungner Instrument AB, Sweden). The amount of redistributed volume was found to be dependent upon the internal compliance. Without additional compressible volume, the ventilator produced up to 18 % redistribution, which under all conditions could be brought below the 1 % level when an internal compliance was introduced. A highly significant correlation between the amount of redistributed volume (pendelluft) and the discharge time-constant of the plateau (rpl = Cr (RI + Rt,) could be established.The results of mathematical considerations gained from an electrical analogue coincided with our experimental findings. From this, some consequences could be derived for the design of an internal compliance for use with a respirator.