CICM SAQ 2010.1 Q22
Questions
22.1. What piece of equipment is shown below? Outline the principle of operation of this equipment.
22.2. The following image shows the connector and a regulator for a Medical Wall Suction outlet.
- (a) What design features of the above equipment prevent it from being connected to the oxygen outlet device?
22.3. The image below is an example of a rapid volume infusion device.
- (a) What are the major determinants of fluid flow through this device?
Answers
Answer and interpretation
22.1. What piece of equipment is shown below? Outline the principle of operation of this equipment.
Non-rebreather or partial rebreather oxygen mask
- Reservoir bag attached to FGF
- One way valve between reservoir bag and patient which prevent expired gas entering the reservoir bag.
- Usual FiO2 reached is between 60-90%.
- Achieving 100% FiO2 is difficult because of valve inefficiency and lack of a tight fit around the face thus entraining room air.
22.2. (a) What design features of the above equipment prevent it from being connected to the oxygen outlet device?
- Colour coding (oxygen is white, suction is yellow)
- A unique sleeve index arrangement for each wall gas
22.3. (a) What are the major determinants of fluid flow through this device?
- Pressure gradient, radius of the catheter raised to the power of 4 (r4) and length of the catheter.
- As described by the simplified Poiseuilles formula for laminar flow through tube:
Flow α ∆ρ.r4/l
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