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Block 2 Week 2 > Leblanc cardiac mechanic slides > Flashcards

Leblanc cardiac mechanic slides Flashcards

1
Q

When you have shortening of muscle fibers what does it cause?

A

ejection

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2
Q

Does heart contract in a linear fashion?

A

no

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3
Q

In normal heart, changes in tensions and length are transformed into changes in (blank)

A

pressure and volume

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4
Q

Contraction of the heart increase (blank). What is this law called

A

wall stress

Laplace’s law

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5
Q

The greater the wall thickness, the less the (blank)

A

wall stress

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6
Q

What is teh equation for leplaces law?

A

wall stress= (pressure X radius)/ wall thickness

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7
Q

Is there an optimal length of sarcomere, Why?

A

Yes, it is aound 2 mm, because you want to create the most tension, (think slingshot, you want to pull back hard enough to get the rock to go but not too hard or you will break it)

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8
Q

Are the resting and active tension length curves in cardiac and skeletal muscle the same?

A

NOOOOO because the resting tension in heart muscles steadily increases

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9
Q

What is the equation for active tension?

A

total-passive

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10
Q

As you increase tension, your (blank) will increase

A

force

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11
Q

When you have active tension what ion is present?

So in passive tension this is not there.

A

calcium

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12
Q

What is preload?

A

it is the pressure volume relationship at the point of complete ventricular filling

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13
Q

How do you find stroke volume?

A

isovolumetric point of systole MINUS isovolumetric point of diastole. OR end disastolic volume-end systolic volume

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14
Q

How do you find ejection fraction?

A

stroke volume/ end diastolic volume

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15
Q

How do you find pulse pressure?

A

Peak of systole minus end of isovolumetric systole point

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16
Q

What is contractiltiy?

A

the change in ventricular pressure during isovolumetric contraction of heart

17
Q

The greater the load the velocity (blanks) exponentially.

A

velocity declines

18
Q

Th greater the force the (blank) the velocity

A

the slower

19
Q

What is the pressure volume loop?

A

it is a magically graph the explains all the phases of the heart. Filling, isovolumetric contraction, period of ejection and isovolumetric relaxation.

20
Q

What is end-systolic pressure?

A

the point at the very end of systole before isolvolumetric relaxation

21
Q

What is starlings law of the heart?

A

If you increase end diastolic volume you will increase contraction of the heart. (i.e more blood in the more contraction you need to pump blood out)

22
Q

Venous return is your (blank) load

A

preload

23
Q

Preload is the end-diastolic volume (EDV) at thebeginningof (blank)

A

systole

24
Q

The End diastolic volume or preload is directly related to the degree of (blank) of the myocardial sarcomeres

A

stretch

25
Q

The product of stroke volume and heart rate determines the (blank)—the primary function of the heart.

A

cardiac output

26
Q

If you increase your preload what will happen?

A

you will increase your pressure (force of contraction), stroke volume, ejection fraction.
end systolic volume stays the same

27
Q

IF you decrease your preload what will happen?

A

you will decrease your pressure (force of contraction), stroke volume and ejection fraction. End systolic volume stays the same

28
Q

What happens if you increase afterload?

A

increase end systolic volume, stroke volume decreases, ejection fraction decreases

29
Q

What happens if you decrease afterload?

A

increase stroke volume,decrease end systolic volume, increase ejection fraction

30
Q

what is the influence of cardiac contractility on pressure volume loops IF increased->?

A

stroke volume increases, EF increases, end systolic pressure decreases. (steeper endsystolic pressure volume curve)

31
Q

what is the influence of cardiac contractility (ANS intervention) on pressure volume loops IF decreased->?

A

End systolic pressure will increase, stroke volume decrease, EF decreases
(flatter endsystolic pressure volume curve)

32
Q

What 3 things control contraction?

A

preload, afterload, and contractility

33
Q

An increase or decrease in preload will respectively increase or decrease (blank)

A

stroke volume and peak developed pressure

34
Q

An increase in afterload will increase (blank) and decrease stroke volume; a decrease in afterload will slightly decrease peak developed pressure and slightly increase (blank)

A

peak pressure

increase stroke volume

35
Q

An increase in cardiac contractility will increase (blank) ; a decrease in contractility will have the opposite effect

A

peak pressure and stroke volume

36
Q

What is the equation for stroke work?

A

pressure X stroke volume

37
Q

What has more stroke work, the left or right ventricle?

A

left

38
Q

If you increase stroke volume what do you increase?

A

EF, and Pulse pressure

Block 2 Week 2 (5 decks)

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