Cardiac Cycle PDF
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Uploaded by LuminousClematis2597
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Summary
This document provides a table-based explanation of the four phases of the cardiac cycle, including the pressures and valve actions associated with each.
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**Cardiac Cycle** +-------------+-------------+-------------+-------------+-------------+ | **Phase** | **1** | **2** | **3** | **4** | +=============+=============+=============+=============+=============+ | | | | |...
**Cardiac Cycle** +-------------+-------------+-------------+-------------+-------------+ | **Phase** | **1** | **2** | **3** | **4** | +=============+=============+=============+=============+=============+ | | | | | | +-------------+-------------+-------------+-------------+-------------+ | **Name** | **Ventricul | **Isovolume | **Ejection* | **Isovolume | | | ar | tric | * | tric | | | Filling** | Contraction | | Relaxation* | | | | ** | - | * | | | - - - | | | | | | | - | | - | +-------------+-------------+-------------+-------------+-------------+ | **When it | During mid | Early | Late | Beginning | | occurs** | to late | systole | systole | of diastole | | | diastole | | | | | | | | - | | | | - | | | | +-------------+-------------+-------------+-------------+-------------+ | **Atrial | ↑ atrial | ↓ atrial | ↓ atrial | ↓ atrial | | vs. | | | | | | Ventricular | ↓ | ↑ | ↑ | ↑ | | Pressure** | ventricular | ventricular | ventricular | ventricular | | | | | | | | | | - | | | +-------------+-------------+-------------+-------------+-------------+ | **Ventricul | ↓ | ↓ | ↑ | ↓ | | ar | ventricular | ventricular | ventricular | ventricular | | vs. | | | | | | Arterial | ↑ arterial | ↑ arterial | ↓ arterial | ↑ arterial | | Pressure** | | | | | +-------------+-------------+-------------+-------------+-------------+ | **AV | Open | Closed | Closed | Closed | | Valves** | | | | | | (mitral, | - | - | | | | tricuspid) | | | | | +-------------+-------------+-------------+-------------+-------------+ | **SL | Closed | Closed | Open | Closed | | Valves** | | | | | | (aortic, | - | - | - - | | | pulmonary) | | | | | | | | | | | | - | | | | | +-------------+-------------+-------------+-------------+-------------+ | **Starts** | - - - | When | When | When | | | | ventricular | ventricular | arterial | | | | pressure \> | pressure \> | pressure \> | | | | atrial | arterial | ventricular | | | | pressure | pressure | pressure | +-------------+-------------+-------------+-------------+-------------+ | **Ends** | When atrial | When | When | When atrial | | | pressure \< | ventricular | arterial | pressure \> | | | ventricular | pressure \> | pressure \> | ventricular | | | pressure | arterial | ventricular | pressure | | | | pressure | pressure | | | | | | | | | | | | - | | +-------------+-------------+-------------+-------------+-------------+ | | | - - | - - | - - | +-------------+-------------+-------------+-------------+-------------+ - -
