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Paramedicine > 1. Cardiology > Flashcards

1. Cardiology Flashcards

1
Q

Explane phase Zero of the cardiac action potential

A

Fast sodium channels open and a rapid influx of Na enters the cell causing the cell to become less negative.
This is known as the upstroke

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2
Q

Explane phase one of the cardiac action potential cycle

A

Fast sodium channel gates close reducing the amount of Na+ that can enter. Cl- - enters the cell while K+ leaves makeing the cell more negatvie.

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3
Q

Explain phase Two of the cardiac action potential cycle

A

Both sodium and potassium enter and leave the cell at the same rate leaving the rate leaving the cell at the same electrical charge.
This is known as the plateau stage.

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4
Q

Explane phase three of the cardiac action potential cycle

A

Potassium rapidly leaves the cell leading to the cell becoming more negativly charged and bringing the cell down to its resting membrane potential

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5
Q

Explain phase four of the cardiac action potential cycle

A

Normal movements of ions into and out of the cell leaving the fell at its resting potential.

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6
Q

What are the Waves and complexes of an ECG

A

P Wave
PR interval
QRS complex
ST segment
J point
T wave

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7
Q

Whats the normal duration of the PRI

A

0.12-0.2 seconds

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8
Q

Normal duration of a QRS Complex

A

0.06-0.12 seconds

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9
Q

Whats the 5 Step ECG method

A
  1. Rate
  2. Regularity
  3. P wave
  4. PR Interval
  5. QRS Complex
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10
Q

What is the NSW Ambulance protocol for narrow complex tachycardias

A
  1. Pt symptomatic with SVT (narrow complex) ➡️ YES
  2. Pt LOC = A or V ➡️ Yes
    If yes valsalva manoeuvre repeat once if not successful then transport.
  3. Pt LOC =A or V ➡️ No
    Synchronised cardioversion
    1st shock 100j
    2nd shock 150j
    3rd shock 200j
    Reassess after each shock (rapid ABC)
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11
Q

What are the three contrindications for syncronised cardioversion

A

1- pt LOC is A or V
2- pt less than 1
3- pt indicating sinus tachycardia, Rapid AF, Atrial Flutter

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12
Q

What does Paroxysmal mean?

A

Abrupt onset and abrupt termination

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13
Q

What heart rate is the difference for SVT and Sinus tachycardia?

A

Less than 150bpm equals sinus tach
Greater than 150bmp equals SVT

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14
Q

Mechanism of action for Adenosine?

A

Stimulates A1 adenosine recpeter and opens ACh senstive K+ channels. By inhibiting Ca+ channels leads to a slower conduction through the Atrioventricular node.

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15
Q

Victoran protocol for adenosine
Eg indications, dose, contraindications

A

6mg:2ml
Indications- SVT
Dose- 6mg IV
12mg IV if no reversion after two minutes
12mg IV if no reversion after two minutes

Contraindications-
AF,
Atrial Flutter
Ventricular rhythms
2nd or 3rd AV block

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16
Q

Describe the workings of the Valsalva maneuver

A

Pushing on a closed glottis increases intrathoracic pressure, opening of the airway decreases intrthoracic pressure now an increase in venous return increaces transmural pressure (pressure within the right atria) stretches the aorta stimulating baroreceptors activating a reflex vagus nerve stimulation leading to a reflex bradycardia.

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17
Q

Whats the following rhythm

A

SVT

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18
Q

Whats The Following rhythm

A

SVT

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19
Q

Definitions of Wide Complex Tachycardias

A
  1. No Atrial association
  2. Ventricular rate greater than 100
  3. QRS Greather than 0.12seconds (wide or broad)
20
Q

NSW Ambulance protocol for wide complex tachycardias

A
  1. Sypmtomatic and VT confirmed ➡️ Yes
  2. Pt LOC = A or V
    If YES
    administer amiodarone and urgant transport
    If NO
    Synchronised cardioversion same as SVT
21
Q

Amiodarone protocol for NSW Ambulance
Presentations
indications
contraindications
dose

A

150mg:3ml

Indications- cardiac arrest and wide complex tachycardia

Contraindications- torsades de Pointes

Dose-
Cardiac arrest-
300mg repeat 150mg once 450mg max dose

Tachycardia-
50mg Every 3 mins. Max dose 300mg

22
Q

Whats the following P wave indicate and why

A

Right atrial Enlargement

In right atrial enlargement, right atrial depolarisation lasts longer than normal and its waveform extends to the end of left atrial depolarisation

23
Q

Whats the following p wave indicate and why

A

Left atrial enlargement

In left atrial enlargement, left atrial depolarisation lasts longer than normal but its amplitude remains unchanged

A notch (broken line) near its peak may or may not be present

24
Q

What are the requirements for pathalogical Q waves (4points)

A
  1. > 0.4 seconds wide
  2. > 2mm deep
  3. > 25% depth of QRS Complex
  4. Seen in leads v1- v3
25
What do pathological Q waves indicate
Current or prior Myocardial Infarction
26
What arteries are effected if an inferior MI is suspected
Right Coronary Artery (RCA)
27
What artery is effected in a septal MI?
Left Anterior descending (LAD)
28
What artery is effected in an Anterior MI?
Left Anterior descending LAD
29
What artery is effected in a lateral MI?
Circumflex artery / LAD
30
Inferobasal Mi is effected by what artery’s
RCA
31
How to diagnose a posterior MI?
Depression in V1-2 and possibly v3 Confirm with v7,8,9
32
ACS management
Hx and vitals Supplement O2 if required (cynotic or decrease SPO2 IV access Quick ECG confirm STEMI Admin Asprin unless contraindicated (300mg) GTN unless contraindicated (600mcg) Morphine (2.5-5mg)
33
Five STEMI imposters
1. Left Ventricular hypertrophy 2. LBBB 3. Ventricular rhythms 4. BER 5. Pericarditis
34
Left ventricular hypertrophic signs
Increase QRS amplitude ST depression and asymmetric T wave inversion Dragged out ST segmant STRAIN PATTERN
35
QRS amplitude steps
1- v1 S wave count depth in mm from baseline to negative point 2- tallest R wave in v5-6 count height in mm 3- add the two figures greater than 35mm suspect LVH
36
Cardiac arrest NSW Drug protocols
- Adrenaline 1mg:10mL every four minutes - Amidarone 300mg then 150mg max of 450mg cycle between adrenaline - Lignocaine 100mg repeat once max dose 200mg cycle between adrenaline
37
Post ROSC care
Rapid ABCs Titrate O2 95% 99% Etco2 35-45 Normalise BP 100mmhg Normalise temp Normalise BGL 12 lead
38
Symptomatic BradyCardia management
Symptomatic ➡️ Yes Oxygen if poorley perfused Vitals, 12Lead IV Atropine If unsuccessful adrenaline infusion. If unresponsive to Adrenaline TCP
39
Asymptomatic bradycardia management
Monitor vital 12 lead Transport to ED
40
Second degree type 1 is
PRI gradually lengthen till drops a complex
41
Second degree type 2 block is
Randomly drops a QRS complex
42
Third degree heart block is
No av association
43
What is concordance
St segmant and T waves deflect in the same direction.
44
Do BBB have concordance or discordant?
Normally BBB produce discordants
45
Sgarbrossa Criteria is?
1- concordant ST segmant elevation greater than 1mm in any lead 2- concordant ST segment depression greater than 1mm in lead V1- V3 3- Discordant ST/S ratio greater than 0.25

Paramedicine (11 decks)

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