Understanding P Waves in ECG

In this video, Sarah from RegisterNurseRN.com reviews the P wave on an ECG. The P wave represents atrial depolarization, leading to atrial contraction initiated by the SA node. A normal rhythm should have one P wave before each QRS complex, with a duration of less than 0.12 seconds. The video explains how to analyze P wave regularity, calculate atrial rate, and check P wave resemblance. It concludes with a prompt to explore more ECG interpretation videos.

What does the P wave on an ECG represent?

• Atrial repolarization

• Ventricular depolarization

• Atrial depolarization

• Ventricular repolarization

Which node is responsible for creating the P wave?

• SA node

• Bundle of His

• AV node

• Purkinje fibers

How should a normal P wave appear in relation to the QRS complex?

• After the QRS complex

• Absent in normal rhythm

• Before the QRS complex

• On top of the QRS complex

What is the maximum duration of a normal P wave?

• 0.08 seconds

• 0.12 seconds

• 0.16 seconds

• 0.20 seconds

How many small squares on an ECG strip should a normal P wave occupy?

• Exactly three squares

• More than three squares

• Less than three squares

• No squares

What does each small square on an ECG strip represent in time?

• 0.08 seconds

• 0.02 seconds

• 0.04 seconds

• 0.06 seconds

What is the first step in analyzing the P wave using an EKG strip?

• Check the rate of P waves

• Check the regularity of P waves

• Check the resemblance of P waves

• Check the amplitude of P waves

How do you calculate the atrial rate from a six-second EKG strip?

• Count the P waves and multiply by 5

• Count the P waves and multiply by 10

• Count the P waves and multiply by 15

• Count the P waves and multiply by 20

What should you use if you don't have calipers to measure P wave regularity?

• A protractor

• A piece of paper

• A piece of string

• A ruler

What is the normal atrial rate for a sinus rhythm?

• 140 to 180 beats per minute

• 60 to 100 beats per minute

• 40 to 60 beats per minute

• 100 to 140 beats per minute