You have been logged out, please login to use this function.
Login
* Email is required
* Password is required
Remember me on this computer
Forgot your password?
Resend verification email?
Practice any time
anywhere
Join Teaching Medicine to get personalized help with what you're practicing or to learn something completely new. We'll save all of your progress.
Help students
succeed with
personalized
practice
Assign our practice cases
Our Software does all the marking
Our algorithms generate feedback
You download the scores
Join Teaching Medicine For Free as
a learner
an instructor
or assistant
Continue
Learner
Instructor or Assistant
Account Details
* First name is required
* Last name is required
* Email is required
Invalid email address format
* Password is required
Learner
Instructor or Assistant
Verify Account
We sent your 6 digit code to your email.
Please enter it below
Send another verification email
Practice anyone
anywhere
Join Teaching Medicine to get personalized help with what you're practicing or to learn something completely new. We'll save all of your progress.
Help students
succeed with
personalized
practice
>Find standards-aligned conten
Assign practice exercises
Track student progress
Join millions of teachers and students
Join Teaching Medicine For Free as
a learner
an instructor
or assistant
Continue
Learner
Instructor or Assistant
Account Details
Email
Please fill in the email address you used for registration. An email with a password reminder will be sent to you.
* Email is required
Invalid email address format
Back to login
An email has been sent to you with a temporary code. Use this code to login now, and you can change your password after you are logged in.
Resend verification email?
Reset Password
* New Password is required
* Confirm password is required
Verify Account
Resend verification email?
Skills
Dx Wisely
ECG
Chest X-ray
Blood Gases
Echocardiography
Ultrasound
CT Head
Dermatology
Neuro
Communication
For Instructors
For Researchers
About
Contact Us
Login
Sign Up
Skills
Login
Sign Up
Dx Wisely
ECG
Chest X-ray
Blood Gases
Echocardiography
Ultrasound
CT Head
Dermatology
Neuro
Communication
Inactivity Log Out
You will be logged out in
.
For your security, your session will automatically end after 20 minutes of inactivity unless you choose to stay logged in.
ECG
Level 1
Tutorial: Analyze the Waveforms
Please wait...
Tutorial: Analyze the Waveforms
This module will teach the basic waveforms on ECG and a stepwise approach of how to analyze them. Practice each step and get feedback on your performance.
How to level up?
Develop your skills by completing our
Practice Cases!
Choose Level
Tutorial: Analyze the Waveforms
P waves! Where are you?
Lessons
42
Times Practiced
1284
Cases Completed
1h 24m
Total Time spent
1m 24s
Average Time
Progress
Accuracy
Efficiency
Accuracy
Efficiency
1
Anatomy
Anatomy
2
Waveform Identification
Waveform Identification
3
Waveform Identification #2
Waveform Identification #2
4
Determine the heart rate
Determine the heart rate
5
Do you have Rhythm?
Do you have Rhythm?
6
P waves! Where are you?
P waves! Where are you?
7
How many P waves?
How many P waves?
8
P wave Size and Shape
P wave Size and Shape
9
PR Interval
PR Interval
10
P conducted to QRS?
P conducted to QRS?
11
QRS Width
QRS Width
Previous
Practice
Next
Previous
Practice
Next Lesson
P waves! Where are you?
Identifying P waves is very important in determining where the electrical impulse within the heart is being generated.
Normal P waves that originate from the SA node move in an
anterior
(toward the front of the chest), and
downward
(toward the feet), and
leftward
direction. Therefore, ECG leads that measure electrical activity in these directions will show the P waves the best. As the wave of depolarization enters the left atrium, it is directed posteriorly a little bit and therefore, in lead V1 (which is good at meauring anterior-posterior), the P wave can be initially upgoing and then sometimes have a small downgoing portion at the end.
The 2 leads that show normal P waves the best are
lead II
(downward and to the left) and
V1
(anterior):
Lead II
V1
For this reason, a "rhythm strip" on a monitor that displays only one ECG lead will usually display lead II.
P waves can be different shapes and sizes, as shown below:
These P waves have 2 small peaks:
These P waves have a small bump:
These P waves are difficult to see. Maybe another lead would show them:
These P waves are upside down, which is called
inverted
:
In these examples, there are
no P waves
:
In this example, there is a lot of "garbage" in the baseline. There are no discrete well formed P waves.
The red arrow points to a
T wave
, not a P wave.
Now it is your turn to practice.
Previous
Practice
Next
Previous
Practice
Next Lesson