Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Phase 1 powerpoint Cardio > Cardiac cycle 1 > Flashcards

Cardiac cycle 1 Flashcards

1
Q

What occurs during P wave?

A

Depolarisation of SAN
Ventricles relax
Mitral valve open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What occurs after P wave?

A

Atrial contraction
LA empties into LV- pressure of LA lowers
LV fills up with blood but dilates- pressure lower than LA
Prevents blood from going back into LA

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How long does QRS complex last?

A

80-120 ms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What occurs during QRS complex?

A

1) Blood fills LV
2) Mitral valve closes as LV gets full, aortic valve closed
3) Isovolumic contraction begins- same volume but pressure increases
4) Volume squeezed- creates pressure of 120mmHG
5) Contraction allows aortic valve to open
6) Pressure is lower aorta than LV pressure so blood empty into
aorta at high speed
7) When blood ejected into aorta end isovolumic contraction
- Volume not same
- Isovolumic contraction then ejection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What point does mitral valve close?

A

QRS complex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What contraction occurs Left Ventricle during QRS complex?
What pressure?

A

120mmHG
Isovolumetric contraction- same vol, diff pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What point does aortic valve open?

A

QRS complex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What occurs during T wave?

A

Repolarisation of ventricle
Ventricles contracting- ejection decreases- fall pressure
ATP hydrolysis breaks bond Ca2+ and TnC
Muscles relax
Pressure drops 80mmHG
Aortic valve closes
25% volume left in LV
Isovolumic relaxation- until pressure 0mmHg

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does pressure drop to during T wave?

A

80mmGH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the P wave represent?

A

Atrial depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What does QRS complex represent?

A

Ventricle depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the T wave represent?

A

Ventricle repolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does the PR interval represent?

A

Start atrial contraction
Ends beginning ventricle depolarisation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does ST segment represent?

A

Ventricles relaxing (repolarising)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

When does ventricular systole occur?

A

QRS complex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What represents atrial depolarisation?

A

P wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What represents depolarisation of R and L ventricles?

A

QRS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What does the P wave represent?

A

Depolarisation of atria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is PQ segment?

A

Signal slows when arrives at AV node

20
Q

Why is the signal slowed in the PQ segment? duration?

A

Allow blood from atria to fill ventricles
120-200ms

21
Q

What does QRS comlex represent?

A

Ventricular depolarisation
Pumping action ventricles
Ventricular systole

22
Q

What does ST segment represent?

A

Time for ventricle pump blood

23
Q

What does the T wave represent?

A

Final Ventricular relaxation/ diastole
Follows repolarization of the ventricles

24
Q

What occurs during diastole?

A

LA fills blood
Pressure increases- 12mmGH
Mitral valve opens
Continue filling 85-95% blood
Atrial pressure decreases- vent increases
Period equal pressure- diastasis

P wave arrives leads depolarisation SAN and LA
Fill rest ventricle

25
Q

What is term for equal pressure during filling of L ventricle from atria?

A

Diastesis

26
Q

Draw and label ECG wave?

A
27
Q

Define dystole?

A

Phase heart muscle relaxes
Fills with blood

28
Q

Define systole?

A

Atria contract
Ventricular systole contracts

Atrial systole move blood from atria to ventricles
Ventricular systole moves blood out heart to pulmonary and systemic circulations

29
Q
A
30
Q

What gives first heart sound?

A

Mitral valve closing during ventricular contraction

31
Q

What gives second heart sound?

A

Aortic valve opens
Aortic pressure is greater than LV pressure

32
Q

Define diastasis?

A

LV pressure=L arterial pressire

33
Q

When does systole occur?

A

Between 1st and 2nd HS M1-A2

34
Q

Define preload?

A

Load before ventricular contraction
measure of the degree of the ventricular stretch when the heart is at the end of diastole

35
Q

Define afterload?

A

Afterload is the force or load against which the heart has to contract to eject the blood

36
Q

Define afterload?

A

Load after ventricles starts contract

37
Q

Define Starlings law?

A

Larger volume of heart- greater energy of contraction
Positive ionotropic effect

38
Q

Define Force-length interaction?

A

Decrease length sarcomere results lower force produced

Cardiac sarcomere 80% length- 10% maximal force

39
Q

Define contractility?

A

Ability increase contraction velocity to achieve higher pressure independent of load

40
Q

Define elasticity?

A

Ability recover normal shape after sydtolic

41
Q

Explain compliance? Equation?

A

Relationship between change in stress and resultant strain (dP/dV)

42
Q

Define diastolic distensibility?

A

Pressure required fill ventricle to same diastolic volume

43
Q

Explain pressure volume loops?

A

Contractility end systolic pressure-volume relationship
Compliance reflected end diastolic pressure-volume relationshi0

44
Q
A
45
Q

What does PR segment represent?

A

Delay AVN

46
Q

Draw and mark main stages?

A

Phase 1 powerpoint Cardio (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions