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Cardiology > CABS Electrical Conduction and ECG > Flashcards

CABS Electrical Conduction and ECG Flashcards

1
Q

What is the role of pacemaker cells?

A

Electrical conduction point (SA node)

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2
Q

What is the role of electrical conduction cells?

A

wiring of the heart

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3
Q

What is the role of the myocardial cell?

A

contracting, muscular cells that contain actin and myosin (more specialized than skeletal muscle cells)

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4
Q

What is the normal pace range of the sinoartial node?

A

60-100bmp

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5
Q

What is the normal pace range of the atrioventricular node?

A

40-60bmp

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6
Q

What is the normal pace range of the bundle of his?

A

20-40bpm

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7
Q

What is the normal pace range of the bundle branches?

A

20-40bpm

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8
Q

What is the normal pace range of the Purkinje fibers?

A

20-40bpm

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9
Q

Cardiac cells include

A

Pacemaker cells which generate conduction

Electrical conducting cells which send along the signal

Myocardial cells which actually contract

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10
Q

Normal sinus rhythm arises from stimulation of what

A

Sinoarterial node (pace maker of sinus rhythm)

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11
Q

The sinoarterial node receives blood supply from what artery?

A

Sinoarterial nodal artery

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12
Q

What structure stimulates the left atria to contract?

A

Bachman’s bundle

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13
Q

Where does sinus rhythm originate?

A

SA node

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14
Q

What structure acts as an electrical insulator between the atria and ventricles?

A

Fibrous Skeleton

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15
Q

The atrioventricular node allows for a pause before the electrical conduction is passed along to the Bundle of His and Purkinje Fibers, how long is the pause?

A

0.1 seconds

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16
Q

What does the pause created by the atrioventricular node allow for?

A

Blood from the atria to fill the ventricles

17
Q

Should the QRS be wide or narrow?

A

Narrow, widening means there is something wrong with the ventricles

18
Q

What is R-prime?

A

2nd upward deflection after QRS complex

19
Q

What is always an irregularly irregular rhythm?

A

aFib

20
Q

What is resting membrane potential?

A

Difference in electrical charge across cellular membrane. Transmembrane potential for cardiac myocytes is -90mV

21
Q

What is the action potential?

A

Rapid shift of cellular voltage

22
Q

Unlike in skeletal muscles where the trigger will be coming from acetylcholine, in cardiac muscle cells the trigger to contract comes from?

A

Automaticity from the SA node

23
Q

Positive inotropes help with

A

increasing muscular contraction

24
Q

Positive chronotropes help with

A

increasing HR (sympathetic- norepinephrine)

25
Q

Negative chronotropes help with

A

decreasing HR (parasympathetic - acetylcholine)

26
Q

Beta receptor that increases HR and increases contractility

A

B1

27
Q

Beta receptor that inhibits smooth muscle contraction

A

B2

28
Q

Alpha receptor that increases smooth muscle contraction which leads to increased BP

A

A1

29
Q

Alpha receptor that inhibits secretions

A

A2

30
Q

What is the potassium level in normokalemia

A

K 3.5 - 5.0 mM

31
Q

What is the potassium level range in moderate hyperkalemia

A

K < 8 mM

32
Q

What is the potassium level of severe hyperkalemia

A

K > 8 mM

33
Q

What electrolyte travels with potassium?

A

Magnesium

Cardiology (15 decks)

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