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Clinical Practice > Defibrillation > Flashcards

Defibrillation Flashcards

1
Q

What is defibrillation?

A

A process in which an electronic device gives an electric shock to the heart

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2
Q

What is voltage?

A

It is known as electrical potential difference measuring electrical pressure

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3
Q

What is the unit of measurement for voltage?

A

Joules

1 joule = 1 volt

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4
Q

What is current?

A

It is the flow of electricity from one region of the circuit to the next

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5
Q

What is the amount of current delivered to the heart dependent on?

A

The voltage and impedance

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6
Q

What is impedance?

A

The resistance to the flow of current

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7
Q

When is impedance likely to occur? (5)

A

A large and/or hairy chest

Breast tissue

Very dry skin

Excess air in the lungs

Improper application of the defib pads

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8
Q

What is Ohm’s Law?

A

Voltage
Current = ————
Impedance

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9
Q

What are the two types of defibrillation?

A

Monophasic defibrillation

Biphasic defib

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10
Q

What is monophasic defib?

A

Where the defib delivers shock to the heart from one vector

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11
Q

What is biphasic defib?

A

Where the defib delivers a shock to the heart via two vectors

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12
Q

What is peak current?

A

The highest amount of current delivered to the heart in a single shock.
Too much peak current can result in electroporation (formation of aqueous pores in the cell surface membrane) of the myocardial cells, which may result in myocardial dysfunction

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13
Q

What is electroporation?

A

Formation of aqueous pores in the cell surface membrane

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14
Q

What is average current?

A

The mean amount of current delivered to the heart in a single shock.
I’m is believed that this is what is responsible for most successful defib

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15
Q

What does ZOLL RBW stand for?

A

ZOLL Rectilinear Biphasic Waveform

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16
Q

What is ZOLL RBW?

A

It starts with the most amount of voltage for any given energy setting and then controls the delivery of current through a series of internal resistors.
This means low impedance patients are not overdosed, while high impedance patients get the most possible current

17
Q

What are the seven safety checks needed prior to placing pads?

A 
Pacemakers/ICD
Patches (GTN)
Perspiration (Water)
Playtex (Metal underwrites bras)
Pendants (Jewellery)
Piercings (that come in contact with pads)
Shave?
18
Q

How much joules is needed for the first shock? (According to resuscitation guidelines)

A

150 joules

Subsequent shocks - comsider increasing the joules if defib allows this

19
Q

What is the guidelines provided by the ZOLL organisation?

A

First shock = 120 joules

Second shock = 150 joules

Third shock = 200 joules

Subsequent shocks at 200 joules

Clinical Practice (7 decks)

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