Inspiratory Pressure Rise Time, Ventilator Hardware, and Software Influence Regional Ventilation in a Simulated Bronchopulmonary Dysplasia Lung Model

2021 ◽  
pp. respcare.08073
Author(s):  
Ibrahim A Sammour ◽  
Robert L Chatburn
Keyword(s):  
Bronchopulmonary Dysplasia ◽  
Rise Time ◽  
Pressure Rise ◽  
Lung Model ◽  
Inspiratory Pressure ◽  
Regional Ventilation

Effects of Inspiratory Pressure Rise Time and Hypoxic or Hypercapnic Breathing on Inspiratory Laryngeal Constrictor Muscle Activity During Nasal Pressure Support Ventilation

2015 ◽  
Vol 43 (8) ◽  
pp. e296-e303 ◽  
Author(s):  
Vincent Carrière ◽  
Danny Cantin ◽  
Stéphanie Nault ◽  
Charlène Nadeau ◽  
Nathalie Samson ◽  
...  
Keyword(s):  
Pressure Support Ventilation ◽  
Muscle Activity ◽  
Rise Time ◽  
Pressure Support ◽  
Pressure Rise ◽  
Inspiratory Pressure ◽  
Support Ventilation ◽  
Constrictor Muscle ◽  
Nasal Pressure

Gaseous Deflagration in Piping: Part 2 — Proposed Methods and Code Acceptance Criteria

2017 ◽  
Author(s):  
John C. Minichiello ◽  
Thomas C. Ligon ◽  
David J. Gross
Keyword(s):  
Rise Time ◽  
Lower Energy ◽  
Waste Treatment ◽  
Pressure Rise ◽  
Piping System ◽  
Frequent Event ◽  
Piping Systems ◽  
Hydrogen Accumulation ◽  
Induced Stresses ◽  
Detonation Loading

This paper proposes Piping Code rules to address the effects of hydrogen deflagrations inside piping. Previous work proposed a set of criteria for piping subject to detonation loading [PVP2012-78519, PVP2012-78525]. This paper provides criteria to evaluate the effect of deflagrations, which typically have a slower rise time and lower energy, inside the piping. These deflagration criteria, coupled with the previously cited detonation criteria, are being used at the Hanford Tank Waste Treatment and Immobilization Plant to evaluate piping systems subject to hydrogen accumulation. The previous papers did not investigate or propose criteria for deflagrations, as these were known to have lower pressures and slower pressure rise times, but are still of some significance for piping design. Recent work has shown that there exists a scenario in which the deflagration loading may be very significant: deflagrations in small gas pockets surrounded by large waste slugs. Depending on the assumptions used to develop the loading, the unbalanced forces on piping segments in a long piping system can become high during a deflagration event. Thus, for the set of criteria chosen for deflagration, the deflagration event may become the limiting event, especially if it is the more frequent event. The criteria proposed need to recognize this scenario and guide the user to possible solutions. This paper presents the original methodology for evaluating these “slug” events, briefly discusses the recent testing and theory being pursued to reduce the effect of the loading [PVP2015-45970, PVP2016-63260, PVP2016-63262], and then proposes criteria for evaluating deflagration induced stresses and loads.

PRESSURE RISE TIME (PRT) INCREASES WORK OF BREATHING (WOB) DURING ASSISTED PRESSURE CONTROL VENTILATION (PCV)

1999 ◽  
Vol 27 (Supplement) ◽  
pp. 94A
Author(s):  
RH Kallet ◽  
JA Alonso ◽  
M Diaz ◽  
JD Marks
Keyword(s):  
Rise Time ◽  
Work Of Breathing ◽  
Pressure Rise ◽  
Pressure Control ◽  
Control Ventilation ◽  
Pressure Control Ventilation

scholarly journals Effect of pressure rise time on starting transients of flue pipes

1989 ◽  
Vol 86 (S1) ◽  
pp. S16-S16
Author(s):  
A. W. Nolle ◽  
T. L. Finch
Keyword(s):  
Rise Time ◽  
Pressure Rise ◽  
Effect Of Pressure

Evaluation of peak inspiratory pressure and respiratory rate during ventilation of an infant lung model with a self-inflating bag

2006 ◽  
Vol 0 (0) ◽  
Author(s):  
Jefferson G. Resende ◽  
Cristiane G. Menezes ◽  
Ana M. C. Paula ◽  
Antônio C. P. Ferreira ◽  
Carlos A. M. Zaconeta ◽  
...  
Keyword(s):  
Respiratory Rate ◽  
Peak Inspiratory Pressure ◽  
Lung Model ◽  
Inspiratory Pressure

Effect of pressure rise time on tidal volume and gas exchange during pressure control ventilation

2000 ◽  
Vol 48 (5) ◽  
pp. 766
Author(s):  
Byung O Jeong ◽  
Youn Suck Koh ◽  
Tae Sun Shim ◽  
Sang Do Lee ◽  
Woo Sung Kim ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Tidal Volume ◽  
Rise Time ◽  
Pressure Rise ◽  
Pressure Control ◽  
Control Ventilation ◽  
Pressure Control Ventilation ◽  
Effect Of Pressure

Effect of pressure rise time on ventilator parameters and gas exchange during neonatal ventilation

2020 ◽  
Vol 55 (5) ◽  
pp. 1131-1138 ◽  
Author(s):  
David Chong ◽  
Sabrina Kayser ◽  
Eniko Szakmar ◽  
Colin J. Morley ◽  
Gusztav Belteki
Keyword(s):  
Gas Exchange ◽  
Rise Time ◽  
Pressure Rise ◽  
Effect Of Pressure ◽  
Neonatal Ventilation

Possibilistic Analysis of Structural Systems Subjected to Blast Loads

2003 ◽  
Author(s):  
Hari B. Kanegaonkar
Keyword(s):  
Pulse Duration ◽  
Rise Time ◽  
Peak Pressure ◽  
Pressure Rise ◽  
Structural Response ◽  
Offshore Structures ◽  
Blast Loads ◽  
Safety Level ◽  
Ignition Point ◽  
Blast Pulse

The accidental release of the hydrocarbons and the possibility of resulting explosion have to be taken into account while designing the topside systems of the offshore structures. Determination of design explosion loads for the topside structures is a complex task since it involves several sources of uncertainty. Dimensioning of blast loads is important in achieving the desired safety level against the structural failure and related consequences. The design loads must incorporate uncertainties due to variability in the ignition point location, the type of ignition source, the volume of the gas released and the characteristics of the gas cloud etc. These uncertainties which are not statistical in nature may not be categorised as random or probabilistic but are cognitive and fuzzy in nature. The probabilistic framework for structural analysis subjected to blast loads could be quite cumbersome due to high number of uncertain variables and complex interdependency. The uncertainty in the load and corresponding uncertainty in the structural response can either be predicted from variations in the uncertain load parameters — a sensitivity evaluation or through a compact “possibilistic analysis”. The blast loads are usually defined as a triangular pulse through peak pressure, rise time and the blast pulse duration as the parameters. In the present investigation, the parameters in the triangular blast load description are assumed fuzzy. The peak pressure, rise time and blast pulse duration are defined using triangular fuzzy numbers. The possibilistic dynamic response of simple structural system — beam — used in the blast wall is obtained using single-degree of freedom approximation. It is shown that the possibilistic response provides rational decision making tool to arrive at desired safety level.

Variation on Tick Removal

PEDIATRICS ◽  
1986 ◽  
Vol 78 (2) ◽  
pp. 379-380
Author(s):  
JEN-TIEN WUNG ◽  
L. STANLEY JAMES ◽  
EITAN KILCHEVSKY ◽  
EDWARD JAMES
Keyword(s):  
Respiratory Failure ◽  
Survival Rate ◽  
Bronchopulmonary Dysplasia ◽  
Inspiratory Pressure ◽  
Severe Respiratory Failure ◽  
Air Leak ◽  
Fetal Circulation

In Reply.— We would like to respond to Dr Levin's letter which questions the appropriateness of publishing our article on the management of infants with severe respiratory failure and persistence of the fetal circulation (PFC), without hyperventilation (Pediatrics 1985;76:488-494). Dr Levin may take exception to the opinions expressed as to how we manage severe respiratory failure, but he cannot take exception to the results. Induction of profound hypercarbia using both a high ventilator rate and a high inspiratory pressure for the treatment of PFC has resulted in a survival rate of less than 60%, an incidence of air leak in excess of 50%, and the development of bronchopulmonary dysplasia in 25% of the patients.

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