First Aid 281-285 Cardio Flashcards Preview

FIRST aid 2015 - Sahaja > First Aid 281-285 Cardio > Flashcards

Flashcards in First Aid 281-285 Cardio Deck (26):
1

Which channel is responsible for phase 0 of SA node AP? What is phase 0?

opening of voltage gated Ca channels; upstroke

2

What are Na channels' role in phase 0?

None, Fast voltage gated channels are permanently inactivated here bc of the resting voltage of these cells is closer to zero than in ventricular myocytes

3

Phase 3 - which channels are operational and which ones are not? Influx/Efflux of which ion?)

Ca channels are now inactivated and there is inc activation of K channels. K efflux

4

Which phase accounts of the automaticity of SA/AV nodes?

Phase 4

5

Which phase is affected by drugs that affect HR?

Phase 4 - slope of phase 4 in SA node determines HR

6

How does SANS stimulation affect HR?

SANS stimulation inc the chances the If channels are open and therefore inc HR

7

Atrila depolarization is reflected in which part of ECG?

P wave

8

Normal duration of PR interval?

<200 msec

9

List the following in order of seep of conduction: atria, ventricles, AV, purkinje fibers

Purkinje > atria > ventricles > AV node

10

Normal duration of QRS?

<120 msec

11

T wave represents which part of cardiac cycle?

ventricular repol

12

U wave caused by?

hypokalemia, bradycardia

13

What does T wave inversion represent?

poss recent MI

14

Which drugs cause long QT?

AntiArrythmics (Class Ia, III)
Antibiotics (Macrolides - and not an antibiotic but also the HIV anti viral rx Protease inhbitors and anti- malaria Chloroquine)
Anti"C"ychotics (haloperidol, Risperidone)\
AntiDepressants - TCAs
Anti-Emetics - Odansetron

15

Which congenital long QT is more common?

Jervell and Lange-Nielsen (AR)

16

Which congenital long QT syndrome is associated with deafness?

Jervell and Lange-Nielsen

17

ECG pattern of Brugada syndrome?

ECG pattern of RBBB (wide QRS, slurred S, T irreg) + ST elevation ( followed by neg T, esp in V1-V3 ) - Parenthesis = not in FA

18

What is underlying patho mech of WPW syndrome?

Abnormally fast conduction from atria --> ventricle, bypassing the AV node

19

ECG signs of WPW?

delta wave + wide QRS + short PR

20

ECG signs of 1st degree AV block?

prolonged PR (>200msec)

21

ECG signs of 2nd degree AV block, Mobitz I?

progressive lengthening of PR interval until a beat is dropped

22

ECG signs of 2nd degree AV block, Mobitz II?

Dropped beats not preceeded by progressively longer PR internals - can be 2 or more P waves to one QRS

23

Which infectious disease is associated with 3rd degree AV block?

Lyme Disease

24

Recombinant form of B type natriuretic peptide?

Nesiritide

25

Physiological effect of ANP?

Causes vasodilation and dec Na resorption at renal collecting tubule, VD of aff art and VC of eff art

26

ANP uses which 2nd messenger?

cGMP