Wiggers Diagram =)

A Wiggers diagram is a standard diagram used in cardiac physiology.

The X axis is used to plot time, while the Y axis contains all of the following on a single grid:

• Blood pressure
  • Aortic pressure (RED)
    
  • Ventricular pressure (BLUE)
    
  • Atrial pressure (YELLOW)
    
• Ventricular volume
• Electrocardiogram
• Arterial flow
  
• Heart sounds
  

By illustrating the coordinated variation of these values, it becomes easier to illustrate the relationship between these values in the cardiac cycle.

Note that during isovolumetric/isovolumic contraction and relaxation, all the heart valves are closed. At no time are all the heart valves open.

• S3 and S4 heart sounds are associated with pathologies and are not routinely heard.