LA Needle Construction Flashcards
Name the parts of the needle end of the syringe.
What is significant about them?
End of the needle is called the bevel, when injecting the losing end of the bevel should always be skin down.
The middle/length of the needle is called the shaft
The point of the needle closest to the body is the hub. Never inject all the way to the hub as it is the weakest point of the needle.
What lengths are a short needle and a long needle?
Short needle is 20-25mm
Long needle is 30-35mm
What 4 components are there of the LA syringe?
Needle, cartridge, syringe and handle.
What should you do before assembling the LA syringe fully?
Write the batch number and expiry date in the patient medical notes.
How do you assemble the LA needle fully?
Inset the cartridge (cap first) into the syringe barrel so that the diaphragm of the cartridge is pierced.
Click the handle into place onto the bottom of the syringe barrel.
How do you sheathe a needle for re-use?
How do you sheathe the needle for disposal?
For re-use, slide the cover up above the needle until one click is heard.
For disposal, slide up until two clicks are heard and the needle is locked away.
What % is lidocaine and how much VC?
What is lidocaine Max dose in mg/Kg
What is its mg per cartridge
How many carts are safe in a 70kg adult?
Lidocaine 2%, 1:80,000 epinephrine
Max dose is 5mg/Kg
44mg per cart
7 carts per adult
What % is articaine and how much VC?
What is articaine Max dose in mg/Kg
What is its mg per cartridge
How many carts are safe in a 70kg adult?
Articaine 4%, 1:80,000 or 1:100,000 epinephrine
Max dose in mg/kg is 7mg/kg
88mg per cartridge
Maximum number of carts is 5
What % is mepivicaine?
What is mepivicaine Max dose in mg/Kg
What is its mg per cartridge
How many carts are safe in a 70kg adult?
Mepivicaine 3%
Its max dose per kg is 3mg
Its mg per cart is 66mg
And max carts is 3
What % is prilocaine and how much VC?
What is prilocaine Max dose in mg/Kg
What is its mg per cartridge
How many carts are safe in a 70kg adult?
What should be considered?
Prilocaine 3%, octapressin or felypressin
Max dose is 8mg/Kg
Mg per cart is 66mg
Number of carts that are safe is 8
Felypressin and octapressin can induce labour in pregnancy
What should be a contra indication for epinephrine in patients?
Heart disease
Uncontrolled diabetes
Uncontrolled hyperthyroidism
Untreated or uncontrolled hypertension
What is a contraindication of articane
Nerve blocks, not enough literature to back the safety / unsafeness of it
What are possible side fx of local anaesthesia and its symptoms?
How would you treat this
Psychogenic stress
Pupil dilation, light-headedness, pallor, scratching, nausea, bradycardia.
Lay them flat with legs elevated, loosen clothing around the neck, maybe provide a sweet drink
What may occur if too much LA is given?
What are the symptoms?
How treat?
LA toxicity
Convulsions, respiratory depression, lack of consciousness
Start BLS
How much local is given for an IDB
2/3 of a cart
