4. Q Wave Overview - ECG assessment and ECG interpretation made easy

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The Q Wave
A Q wave is any negative deflection that precedes an R wave
The Q wave represents the normal left-to-right depolarisation of the interventricular septum
Small ‘septal’ Q waves are typically seen in the left-sided leads (I, aVL, V5 and V6)
Q waves in different leads
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Small Q waves are normal in most leads
Deeper Q waves (Greater than 2 mm) may be seen in leads III and aVR as a normal variant
Under normal circumstances, Q waves are not seen in the right-sided leads (V1-3)
Pathological Q Waves
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Q waves are considered pathological if:
Greater than 40 ms (1 mm) wide
Greater than 2 mm deep
Greater than 25% of depth of QRS complex
Seen in leads V1-3
Pathological Q waves usually indicate current or prior myocardial infarction.
Loss of normal Q waves
----------------------------------------
The absence of small septal Q waves in leads V5-6 should be considered abnormal.
Absent Q waves in V5-6 is most commonly due to LBBB.
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[@doctorbhanuprakash]

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[@mohsinalivlogs6475]

thank you so much sir ... currently I'm working in cardiac icu and I'm learning all these things ....and you explain it in easy way .....

[@doctorbhanuprakash]

It's my pleasure

[@nyn6488]

Thank you, this is so helpful. You solved my problem within 10 minutes. Thank you so much sir.

[@doctorbhanuprakash]

Great to hear!

[@emireshabani1856]

Clear, short and understanding explanation. Thank u a lot doctor!

[@doctorbhanuprakash]

Glad it was helpful!

[@iftekhairulibnekamal2446]

Nice lecture. Love from Bangladesh

[@doctorbhanuprakash]

Thanks and welcome

[@tubeysr]

Such a beautiful lecture 💛 Thank you so much.

[@doctorbhanuprakash]

You're most welcome!

[@alvinzulmaeta4949]

Thank you so much for the lecture. God bless you. amenn

[@doctorbhanuprakash]

Welcome!

[@Praveen12957]

I have deepened q wave

[@rithikrithik3397]

Sir i have a doubt 11.26 u said that the ecg report having deep pathological q wave sir but if it is deep pathological q wave then where is R wave in that sir

[@sobialaghari225]

Thank u so much

[@popiteri9232]

Excellent sir!

[@doctorbhanuprakash]

Thank you kindly

[@bashamohammad8210]

My mother has arteries blockage she is using medicine recently her ECG says q in iii what does it mean ? Pls suggest

[@whitecanvas2844]

Sir do abnormal q wave in v4 and v5 be a serious concern?

[@demekeeligo64]

thank you soooooo much!!!!! well explained

[@doctorbhanuprakash]

You are most welcome

[@GovindRaj-fk5rh]

RESPECTED DOCTOR, I have taken ECG today 12-05-2023. In report it is mentioned as 1. normal PR and QT interval. 2. QS inferior Leads. 3. No acute ST changes What does this mean. Kindly explain.

[@vishalsheth6760]

thank you

[@mycomputer912]

Good 👍

[@HoilamHaokip]

wonderfull teacher thank somuch sir GOD bless you

[@doctorbhanuprakash]

So nice of you

[@pavandr2182]

It was not clear sir, i mean video was not clear

[@muhammadwahid2791]

🙏🏽

[@prabhapanhaur6616]

😇😇😇😇😇😇😇

[@gaffarbhaijan5340]

Kash hindi me bolte sir to or bhi samajh me ata

[@pierre-alexisdupont980]

Hello, thanks a lot for your video. I have one question, what is the difference between an evolved myocardic infarction and an old MI? Thanks a lot

[@Kjuken69]

Great learning video! Thanks!

[@doctorbhanuprakash]

Our pleasure!

[@camerynevans]

So incredibly helpful! Thank you so much for your videos

[@doctorbhanuprakash]

You are so welcome!

[@leonardovictor3845]

Anyone tell me, the real reason why q wave is abscent in v1, v2..

[@emireshabani1856]

I think the depolarization of the intact septal wall does not allow it to penetrate with sufficient intensity for the q wave to appear towards v1 v2 leads.

[@GiAndrei97]

Thank you for this direct and simple lecture

[@doctorbhanuprakash]

Glad it was helpful!

[@dr.anooparyan007]

The Best! 💖Thank you very much sir We are all Grateful to u 🙏

[@doctorbhanuprakash]

It's my pleasure

[@rubi4603]

Thank you very much sir ,

[@doctorbhanuprakash]

All the best

[@LEARNING-MEDICAL-EDUCATION]

is T wave inversion normal in v1?

[@drnikhilmalviya7889]

Very nice sir 👌👌👌 Thank u for the explanation

[@doctorbhanuprakash]

So nice of you

[@amolkelkar7231]

nice information