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Old 07-08-2011
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Help Mechanical Venitlators, help!

Hi everyone!


Would any of you be kind enough to share some basic knowledge on how mechanical ventilators work. I keep getting questions on ventilator settings and I keep getting them wrong. Any help would be very much apprecitated, thanks!
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Old 07-08-2011
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Originally Posted by meanmr.mustard View Post
Hi everyone!


Would any of you be kind enough to share some basic knowledge on how mechanical ventilators work. I keep getting questions on ventilator settings and I keep getting them wrong. Any help would be very much apprecitated, thanks!
Ventilator mainly provides mechanical respiration in patients with respiratory failure, paralyzed chest, sedated...etc.

In this cases goal is to provide patient with mechanical ventilation who cannot breath on their own. That is to provide assisted respiration and positive pressure breathing.

They are two types: 1) Negative pressure 2)Positive pressure
Negative pressure does not require artificial airway. It creates negative pressure to expand chest wall.

Where as Positive pressure uses positive pressure to expand chest wall and requir artificial airways.

There are again 4 types in positive pressure and they are volume cycled:It delivers preset tidal volume eg: ARDS,Bronchospasm

Pressure cycled: Deliver gas at preset pressure.eg: Neonates with respiratory problem who are with small lung volume.Main advantage is prevent lung damage from high inspiratory pressure. Used for short term therapy.

others are timed and flow cycled ventilator which are not used much.
They have settings like oxygen saturation,tidal volume.respiratory rate etc which are adjusted according to patients need.
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Old 07-08-2011
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@Confident:

Thank you for the clear info, very helpful. Can you pls explain what "artificial airway" is? Do you mean intubation with endotracheal tube?

Also, I do not quite understand how negative pressure ventilator work without "artificial ariway"?

Thanks again!
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Old 07-08-2011
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Originally Posted by usluipek View Post
@Confident:

Thank you for the clear info, very helpful. Can you pls explain what "artificial airway" is? Do you mean intubation with endotracheal tube?

Also, I do not quite understand how negative pressure ventilator work without "artificial ariway"?

Thanks again!
Artificial airways are mechanical device to provide unobstructive breathing in various cicumstances..like in ER they use mostly temporary ones..In ICU they use endotracheal tubes,tracheostomies, combitube used by paramedics in resuscitation, oropharyngeal when tongue falls back upper pharynx, nasophaynx through nose atc...




So in negative pressure ventilator it dont need artificial airway. They have chambers or shell in which patients are placed,or enclosed to body and air is removed from chamber, so it create negative pressure which expands chest wall and inspiration occur then negative pressure is removed so chest wall falls back and expiration occur.
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Old 07-09-2011
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One thing more that I want to add in this is that PaO2 is regulated by PEEP and FiO2 whereas PaCO2 is regulated by tidal volume and ventilation rate.Thus we can adjust these variable to have desire PaO2 and PaCO2 according to the condition of the patient
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Old 07-09-2011
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Thanks insomnic and confidence! Both of you summarized it so well, better than the text books
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