Electrical and mechanical events of the cardiac cycle

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What is the purpose of the AV pause?
To allow filling of the ventricles before it contracts and prevent rapid firing from being transmitted.
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What does the fast conduction through ventricles allow?
Apex to contract before base, pushing the blood upwards.
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Do all tissues have spontinuity, what does this mean?
Yes, they all having increasing membrane potential between beats rising up to threshold and spontaneously beating
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What does the hierarchy of pacemakers mean?
That the SV node drives the rhythm as it is the fastest.
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What happens during diastolic depolarisation that causes the funny current?
Na+ channels open and Na+ comes in (opposite to normal) as switched on by membrane becoming more negative. Closely modulated by ACh and adrenaline.
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What is the order of the ECG trace of limblead2?
PQRST
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What does P show?
Atrial depolarisation +ve, then the gap is AV pause
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What does Q show?
first part of septum depolarisation but towards base so -ve wave.
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What does the QR wave show?
Depolarisation of ventricles +ve to wards apex.
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What does the RS wave show?
depolarisation of ventricles towards base -ve.
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What does the T wave show?
wave of negative repolarisation of ventricles towards apex.
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What is isovolumetric contraction and relaxation?
Contraction-When pressure in the ventricles rises but it's volume doesn't change during ventricle filling. Relaxation-when pressure in ventricles drops but no volume change.
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What is stroke volume , include average measurement?
How much each beat is pumping out 70ml/min
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What is stroke work?
How much work the ventricles are putting in.
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What volumes do the LV change between in ml?
50-120 ml.
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Other cards in this set

Card 2

Front

What does the fast conduction through ventricles allow?

Back

Apex to contract before base, pushing the blood upwards.

Card 3

Front

Do all tissues have spontinuity, what does this mean?

Back

Preview of the front of card 3

Card 4

Front

What does the hierarchy of pacemakers mean?

Back

Preview of the front of card 4

Card 5

Front

What happens during diastolic depolarisation that causes the funny current?

Back

Preview of the front of card 5
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