DOUBLE CANNULA AND TUBING, SINGLE SAL MACHINE AT 1 ATM OF NEGATIVE SUCTION PRESSURE

Background & Aim: Although trachea-bronchial suctioning (TBS) is one of the important nursing procedures in intensive care units (ICU), it may be associated with some complications. Using closed system suctioning (CSS) is one of the ways to decrease the rate of complications due to continued ventilation and oxygenation at the time of suctioning. However, CSS' secretion removal is not efficient enough. Higher values of suction pressure have been recommended to enhance the efficacy of CSS. The aim of this study was to compare the efficacy of two levels of negative suction pressure in secretion removal of CSS used for mechanically ventilated (MV) patients. Materials & Methods: Fifty eligible adult MV patients (twenty in each group) with Random allocation participated in this clinical trial study with cross-over design. Each patient was suctioned using CSS, connected to a central suction device, with 100 and 200 mmHg pressures with a two-hour interval. Efficacy of suctioning was measured by the absence of secretion flow at the end of suctioning. Volume of the secretions was measured and compared in each suctioning. Statistical analyses were done using Minitab and SPSS software considering the significance level of 0.05. Results: CSS using 200 mmHg resulted in an efficacy of 96% for removing secretions, compared to 34% for 100 mmHg (P = <0.0001). Suctioning volume was increased significantly higher with 200 mmHg suction pressure compared to values with 100 mmHg (1.72 [95% confidence interval (CI): 1.4; 2.0]; P<0.0001). Conclusion: Application of CSS with Suctioning pressure 200 mmHg is recommended for trachea-bronchial suctioning in mechanically ventilated patients, because nearly complete removal of respiratory suctioning in most subjects.

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Bradycardia Secondary to Negative Suction Pressure Applied to Chest Drain

Case Reports in Clinical Medicine ◽

10.4236/crcm.2019.88026 ◽

2019 ◽

Vol 08 (08) ◽

pp. 216-221

Author(s):

Sanjeev Arya ◽

Shantanu Belwal ◽

Sanjay Saxena ◽

Bhupesh Uniyal

Keyword(s):

Chest Drain ◽

Suction Pressure ◽

Negative Suction

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Measurement of Suction Pressure Generated in the Process of Frost Heaving in Rock

Journal of MMIJ ◽

10.2473/journalofmmij.133.4 ◽

2017 ◽

Vol 133 (2) ◽

pp. 4-11

Author(s):

Dai NAKAMURA ◽

Takayuki KAWAGUCHI ◽

Tatsuya WATANABE ◽

Shunzo KAWAJIRI ◽

Shintaro YAMASAKI ◽

...

Keyword(s):

Suction Pressure ◽

Frost Heaving

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EXTRACTION OF MINUTE GAS BUBBLES FROM LIQUIDS FLOWING IN A SIMULATED CARDIOPULMONARY BYPASS SYSTEM BY A VENTURI-ASPIRATOR UNIT

Journal of Mechanics in Medicine and Biology ◽

10.1142/s0219519402000514 ◽

2002 ◽

Vol 02 (03n04) ◽

pp. 297-312

Author(s):

WEN-JEI YANG ◽

AMR EID ◽

R. ECHIGO

Keyword(s):

Cardiopulmonary Bypass ◽

Flow Rate ◽

Whole Blood ◽

Pressure Difference ◽

Gas Bubbles ◽

Blood Oxygenation ◽

Straight Tube ◽

Suction Pressure ◽

Total Flow ◽

Total Flow Rate

An experimental study is performed to extract minute gas bubbles from liquids flowing in a simulated cardiopulmonary bypass system using a Venturi-aspirator unit. In other words, oxygen bubbles in oxygenated blood are simulated by air bubbles in water with AP30 (about same viscosity as whole blood). This study is intended to determine the feasibility of using a Venturi aspirator unit to extract minute gas bubbles from a simulated cardiopulmonary bypass system. Testing of the Venturi-type bubble extraction is carried out using three different test sections. Two Venturis are used, and a straight tube configuration is used as a control. The two Venturis are similar, with the exception that one has a longer inlet cone which causes the entering liquid to accelerate at a slower rate. Results are obtained for effectiveness of the aspirator unit as functions of total flow rate, extraction suction, suction pressure difference, and hydraulic head. It is concluded from the study that:(i) The effectiveness of the Venturis is typically between 90 and 100 percent. It increases with an increase in suction or suction pressure difference but decreases with an increase in total flow rate.(ii) The Venturi is most suitable for extraction of minute gas bubbles, especially for use with AP30 (whole blood), which yields substantially higher effectiveness than water.(iii) It is anticipated that a Venturi-aspirator unit can be superior to other bubble separation device as the cardiopulmonary bypass system for applications in extra corporeal blood oxygenation.

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Modelling the variation of suction pressure during caisson installation in sand using FLAC3D

Ships and Offshore Structures ◽

10.1080/17445302.2015.1051311 ◽

2015 ◽

Vol 12 (7) ◽

pp. 893-899 ◽

Cited By ~ 9

Author(s):

Moura Mehravar ◽

Ouahid Harireche ◽

Asaad Faramarzi ◽

Amir M. Alani

Keyword(s):

Suction Pressure

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Friction of outer rotor affecting friction torque characteristics in an internal gear pump

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406214565804 ◽

2014 ◽

Vol 229 (16) ◽

pp. 3013-3026 ◽

Cited By ~ 2

Author(s):

Yoshiharu Inaguma

Keyword(s):

Pressure Distribution ◽

Friction Force ◽

Significant Loss ◽

Friction Torque ◽

The Body ◽

Gear Pump ◽

Suction Pressure ◽

Outer Rotor ◽

Internal Gear ◽

Outer Circumference

This article presents the friction torque in an internal gear pump and the friction force between an outer circumference of an outer rotor and a body, which causes a significant loss, has been investigated. When in use at a high pressure, the pump has a large friction torque due to the friction force acting on the outer rotor circumference. This friction force is caused by imbalanced force acting on the outer rotor. As well as by a positioning suction and a delivery port, the force can be reduced by setting a suction pressure recess in a section of the outer rotor circumference. In this study, through the measurement of the friction torque in an actual pump and the pressure distribution on the outer circumference of the outer rotor, it is investigated how the suction pressure recess can change the force acting on the outer rotor. The actual internal gear pump without the suction pressure recess has a large friction torque, and it corresponds to a large force on the outer rotor, which is calculated from the pressure distributions on the inside and outside of the outer rotor. In addition, on the basis of the measured friction torque of the test pump and the force acting on the outer rotor, calculated using the results of the pressure distribution, the coefficient of friction between the outer rotor circumference and the body can be estimated.

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Research on Influences of Transient High IOP during LASIK on Retinal Functions and Ultrastructure

Journal of Ophthalmology ◽

10.1155/2009/230528 ◽

2009 ◽

Vol 2009 ◽

pp. 1-5 ◽

Cited By ~ 3

Author(s):

Haixia Zhao ◽

Yude Ai ◽

Chunmei Niu ◽

Wenying Guan ◽

Xiaoling Li ◽

...

Keyword(s):

Optic Nerve ◽

Normal Control ◽

Control Group ◽

Sharp Change ◽

Experimental Control ◽

New Zealand White Rabbits ◽

Prolonged Recovery ◽

Flash Visual Evoked Potential ◽

Negative Suction ◽

Retinal Functions

Objectives. To study the influences of transient high intraocular pressure(IOP) during LASIK on retinal functions and ultrastructure.Methods. Thirty-two New Zealand white rabbits were randomly divided into normal control, experimental control, negative suction 20 s and negative suction 3 min groups. The experimental control group was treated only by laser. Rabbit eyes received suction for different periods of time (20 s, 3 min) by negative pressure generator in different groups. The changes of neuro-optic and retinal ultrastructure were observed under electron and light microscopes; retinal neurofunctional changes were observed with flash-visual evoked potential (F-VEP) and flash-electroreinogram (F-ERG).Results. There was no obvious change in optic nerve, retina, ERG a-wave and b-wave in normal control and experimental control groups. There were slight changes in tissues of optic nerve and retina at various times of suction 20 s compared with control group, and a sharp change in suction 3 min group within 14d after operation, but these changes recovered at 28d. Amplitude of ERG b-wave observed at different time will decrease with suction periods prolonged. It can recover to normal level with the prolonged recovery periods. Amplitude and incubation period of ERG a-wave and VEP-P did not change significantly after different duration of suction.Conclusions. The transient high IOP during LASIK might have influence on retinal function and ultrastructure, but these changes were reversible.

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