You're absolutely right. It should be 300/ (number of large squares between QRS complexs). I must have got them otherway round in the video. Thanks for letting me know, I'll add a note
Absolutely! The leads essentially act as vectors and map the direction of the current flowing through the heart. So if you find two leads which track electrical flow in opposite directions you can use this for axis calculation Lesd one primarily tracks electrical flow from right to left. Lead 3 and avf plots it going downwards and slightly from left to right. So if you have a positive deflection in lead I and negative in lead III you can say more electricity is flowing right to left (left axis deviation) and vice versa. Hopefully that makes sense. If not let me know
Very good question. On an Ecg strip the best way to do it is by counting the number of QRS complexes and multiplying them by 6 (as the strip is over 10 seconds)
Count R waves between 30 large sqares (i.e in 6 seconds) multiply it by 10 to make u it for 1 minute. Top of ECG paper there's a black or red mark after every 15 large sqares, this will help you quickly count nt the 30 large squares.
superb
Thank you!
Thanks a lot doc❤️
You dont divide the no. of large squares between two Rs.
Its the opposite. Divide 300 by the no. of large squares.
You're absolutely right. It should be 300/ (number of large squares between QRS complexs). I must have got them otherway round in the video. Thanks for letting me know, I'll add a note
So lead one and two we look at to determine the axis?
Great question. Generally speaking yes, however others you can look at include I and III
@@bunmed3817 can we look at lead 1 and avf to determine axis?
Absolutely! The leads essentially act as vectors and map the direction of the current flowing through the heart. So if you find two leads which track electrical flow in opposite directions you can use this for axis calculation
Lesd one primarily tracks electrical flow from right to left. Lead 3 and avf plots it going downwards and slightly from left to right. So if you have a positive deflection in lead I and negative in lead III you can say more electricity is flowing right to left (left axis deviation) and vice versa.
Hopefully that makes sense. If not let me know
How to determine heart rate in irregular rythm/?
Very good question. On an Ecg strip the best way to do it is by counting the number of QRS complexes and multiplying them by 6 (as the strip is over 10 seconds)
Count R waves between 30 large sqares (i.e in 6 seconds) multiply it by 10 to make u it for 1 minute.
Top of ECG paper there's a black or red mark after every 15 large sqares, this will help you quickly count nt the 30 large squares.