Week 3

Question 1

How much does an AV defib weigh?

Answer 1

Under 25kg

Question 2

What is a Joule?

Answer 2

• one amp of current
• passed through 1 ohm of resistance
• for one second

Question 3

What is the formula for Energy in Joules?

Answer 3

Voltage X Current X Time

Question 4

How is current expressed?

Answer 4

Voltage/ impedence

Current is what defibs the heart

Question 5

What is impedance?

Answer 5

Resistance to flow of current

Question 6

What can Impedance be impacted by?

Answer 6

• Patients Body mass
• patients body composition
• temperature
• Diaphoresis
• Quality of contact with the pads

Question 7

What is Monophasic defibrilation?

Answer 7

shock delivered to heart over one vector

• no ability to adjust for impedance

Question 8

What is the joules delivered through monophasic defib?

Answer 8

360 joules in all adult patients

Question 9

How many joules are delivered to a paed with monophasic defib?

Answer 9

4 J/kg

Question 10

What is biphasic defib?

Answer 10

where waveform where shock is delievered to heart via 2 vectors… in a loop sort of

Question 11

Why is biphasic good for VF?

Answer 11

Shown to allow termination of VF at lower current than monophasic

Question 12

Why is biphasic better than monophasic?

Answer 12

• less conduction abnormalities and damage to the heart
• Less energy required
• > which means smaller battery, smaller unit, less charging time -> quicker to defib

Question 13

Advantages of AED

Answer 13

• analyses patient for you
• decided whether shockable rhythm
• provides step by step instructions

Question 14

Disadvantages of AED

Answer 14

• increased hands of chest time
• decreases interthoracic pressure
• can analyse rhythm incorrectly based on criteria used
• criteria may not match AV’s guidelines

Question 15

What are the advantages of Manual mode on the defib

Answer 15

• allows you to select joules
• > 200 J for adults
• > 4j/kg for paeds
• allows user to analyse rhythm of the patient
• Can be quicker than auto mode - less hand of chest time

Question 16

What are the advantages of Manual mode on the defib

Answer 16

• Difficult decisions could take longer
• to diagnose slow VT it needs to be printed
• sometimes can look like asystole when its fine VF

Question 17

Where do defib pads get placed?

Answer 17

Lateral - Left Mid auxilliary line - 6th IC space

Anterior - Right parasternal area over 2nd IC space. Between nipple and clavicle

Question 18

How long should a ventilation in high performance CPR last?

Answer 18

1 second per ventilation

Question 19

What does COACHED stand for in cognitive first aid emergency defib?

Answer 19

Continuous compressions
Oxygen away
All others away
Charging
Hands off
Evaluate Rhythm
Defib or disarm

Question 20

What is the interpretation criteria for VF?

Answer 20

• Ventricular rate - Nil discernable
• Ventricular Rhythm - Bizzare, chaotic, amplitude >0.1mV
• P waves - Nil discernable
• PR interval - Nil discernable
• QRS duration - nil discernable

Question 21

What is the interpretation criteria for VT?

Answer 21

Ventricular rate - >100

Ventricular rhythm - Regular

P waves - not associated or nil discernable

• PR interval - nil discernable
• QRS duration - >0.12