The 5 stages of the cardiac cycle.?

The 5 stages of the cardiac cycle.?
P wave

1. The first deflection of the cardiac cycle

2. Represents depolarization of the atria

3. Begins as the waveform begins to leave the baseline, and ends when it returns to baseline



PR interval

1. Represents the time required for the electrical impulse to leave the SA node and travel through the atria, AV node, bundle branches, and Purkinje fibers

QRS complex

1. Represents ventricular depolarization

2. Measured from the beginning of the QRS as the first wave leaves the baseline to the J point

J point

a) The junction between the QRS and the ST segment

b) Where the last wave of the complex begins to flatten out at, above, or below the baseline

c) Elevation or depression of the ST segment can make finding the J point difficult

ST segment

1. Represents the end of ventricular conduction


T wave

1. Represents ventricular recovery or repolarization

QT interval

1. Measures ventricular depolarization and repolarization


U wave

1. Represents the recovery period of the Purkinje fibers
Essay format: I need to include the heart sounds, the ECG and what the P,QRS, &T represent either contraction or relaxation of the chambers. THANK YOU!

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