Cardiac Pressure Waveforms

Question 1

What are the two main wave form crests in atrial pressure waveform?

Answer 1

A and V

Question 2

What physiologic action produces the A wave?

Answer 2

Atrial contraction

Question 3

What physiologic action produces the V wave?

Answer 3

The atria filling with blood

Question 4

What EKG waveforms precede the atrial A and V waves?

Answer 4

The P and QRS respectively.

Question 5

What are the sub-waves associated with the A wave?

Answer 5

x, c and at times x1

Question 6

What does the x wave represent?

Answer 6

A decrease in intra-atrial pressures that occurs with atrial relaxation.

Question 7

What does the c wave represent?

Answer 7

It is thought to be caused by bulging of the AV valves bulging upward.

Question 8

What is the x1 wave representing?

Answer 8

If the x waves descent is distorted by a c wave, the continued downslope is termed x1 and represents continued atrial relaxation.

Question 9

What does the Y wave represent?

Answer 9

Atrial emptying into the ?

Question 10

How would A-fib/flutter affect wave morphology?

Answer 10

the A waves would be replaced by a fibrillatory pattern