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THE DIFFERENCE BETWEEN HIGH FLOW AND LOW FLOW SYSTEM

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abdulrahman saleh

on 17 February 2014

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Transcript of THE DIFFERENCE BETWEEN HIGH FLOW AND LOW FLOW SYSTEM

TYPES OF OXYGEN DELIVERY SYSTEMS
There are two major types to deliver oxygen those are :

1- Low-Flow system
2- High-Flow system

OUTLINES
1- Intro.
2- Types of Oxygen flow systems
3- Patient demand what is it and how to calculate it .
4- definition of the two systems
5- Example of low flow and high flow devices .

PATIENT DEMAND
Its the patient needing of oxygen and if we know it , we can select the system of oxygen delivery .
HOW TO CALCULATE IT
Peak Inspiratory Flow rate
=
3 x minute ventilation

How we calculate minute ventilation


MV = RR x TV
You can judge the performance of an oxygen delivery system by answering two key questions :

1- How much oxygen can the system delivered FiO2 ?

2- Does the delivered FiO2 remain fixed or vary under changing patient demand ?
HIGH-FLOW SYSTEM
High flow system supply a given oxygen concentration at a flow equaling or exceeding the patient's PIF , providing all of the inspiratory flow required by the
 patient at consistent  FiO2s.


An
air-entrainment
or a
blending
systems are used. As long as the delivered flow esceeds the patient's flow, both systems can ensure a fixed FiO2 .
THE DIFFERENCE BETWEEN HIGH FLOW AND LOW FLOW SYSTEM
INTRODUCTION
Why do we need Oxygen ?
LOW-FLOW SYSTEM
Typical low-flow systems provide supplemental oxygen directly to the airway at a flow of 8 L/min or less.

Because the inspiratory flow of a healthy adult exceeds 8 L/min, the oxygen provided by a low-flow device is always diluted with air so the result is a low and variabl FiO2.


By :
Abdulrahman Saleh Alsalmi


2130003611

Muhannad alzahrani
2120000996

Those are example of Low-Flow system devices :
Nasal cannula

Simple face mask
Those are example of High-Flow system devices :
1- Air-entrainment mask

{ Venturi mask }
2- Oxygen Tent
3- Face Tent


REFERENCE
Egan fundamentals of respiratory care 10th edition .

-http://www.dmacc.edu/instructors/kegeorge/prac5/matrixII.htm
We Are opening the floor for questions ..
Thank you for listening
:)
Low flow system
1- can not exceed patient demand
2- given O2 dilute with air
3- most common devices are nasal cannula and simple face mask .
High-flow system
1- exceed patient demand .
2- most common devices are Non-rebreathal mask and venturi mask

Nasal Cannula

Delivers 24 to 44% oxygen at 1 to 6 L/min

1 = 24 2 = 28 3 = 32 4 = 36 5 = 40
6 = 44


Simple face mask
Delivers 
35
 to 
55 %
 O2 at flows of 
5
 to
12
 L/min

Must never be used at flows less than 5 L/min to prevent rebreathing of CO2

The percentage of O2 
delivered by a low flow device is variable 
because RA is entrained.
FiO2 will vary depending on the patients RR, pattern and VT
Patients who have
 variable ventilatory patterns, RR >25 and VT that vary outside of 300-770mL, should not
 use a low flow system .

Venturi Mask
Venturi Mask
 
or
 air-entrainment
masks provide FiO2’s from
 
24
 to
 
50%
.


The size of the entrainment port determines FiO2 .

The larger the port, the more RA entrained, the lower the FiO2

21 -50%
 at flow rates 
of
 10
 to 
15
 L/min .

Used mainly on children
 with croup or pneumonia .

Face Tent
21%
 to 
40%
 depending on nebulizer setting Flow rates of 
8
 to 
15
 L/min .

Used mainly for patients who can not tolerate a mask

Oxygen tent
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