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Cardiac Cycle

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imissyou419's version from 2017-01-29 18:17

Section

Question Answer
Atrial systoleP wave -> atria contract
↑ atrial pressure > ventricular pressure (AV valve already open)
Last 30% of ventricular filling -> EDV
Isovolumetric contractionQRS complex -> ventricles begin contracting -> pressure build up in ventricles
Ventricular pressure > atrial pressure -> AV valve closes (1st heart sound)
No change in volume (ventricular pressure < aortic pressure)
Atria pressure rises briefly because pressure in ventricles pushing back onto AV valve
Ejection PeriodVentricles continue to contract
Ventricular pressure > aortic pressure -> aortic valve opens -> blood leaves ventricles
Ventricular volume decreases
T-wave
ProtodiastoleVentricles just begin to relax
Ventricular pressure falls slightly
Aortic pressure is higher than ventricular pressure b/c blood is still moving into aorta due to inertia
A little blood leaves ventricles
Left with ESV
Isovolumetric relaxationVentricles continue to relax -> ventricular pressure drops further
Blood reverses directions -> Aortic valve closes (2nd heart sound)
Slight rise in aortic pressure because valves give a bit and snap forward, pushing back blood into aorta (incisura)
Ventricular pressure > atrial pressure -> no change in volume
Pressure in atria slowly rising b/c blood flowing in
Rapid inflowVentricles slow relaxing
Ventricular pressure < atrial pressure -> AV valve opens
Blood rapidly enters ventricles (most of ventricular filling takes place here)
Ventricular volume ↑
Occupies first 1/3 of ventricular diastole
DiatasisVentricles relaxed
Ventricular pressure < atrial pressure -> AV valves are still open
Blood slowly enters ventricles
Occupies middle 2/3 of ventricular diastole
Incisura, when does it happen?slight rise in aortic pressure because valves give a bit and snap forward, pushing blood back into aorta, happens in isovolumetric relaxation
When does the last 30% of ventricular filling take place?atrial systole
When is EDV and ESV?EDV (atrial systole), ESV (protodiastole)
When does blood rapidly enter the ventricles? What x/3 does it occupy?rapid inflow, first 1/3
When does blood slowly enter ventricles? What x/3 does it occupy?diastasis, middle 2/3
When does P-wave happen?atrial systole
When does QRS complex happen?isovolumetric contraction
When does T-wave happen?ejection period
When does most ventricular filling take place?rapid inflow
What results in the first heart sound?reverberation within the blood associated with the sudden block of flow reversal in ventricles by the AV-valve
What results in the second heart sound?reverberation within the blood associated with the sudden block of flow reversal in aorta
What results in the third heart sound?rapid inflow phase of blood into ventricles in children
memorize

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