Basics of Q wave and abnormalities in ECG

Описание: #isjnature #ecgmadeecg ##basicsofqwave
#qvaveecg #qwave #pathologicalqwave #qwaves #Qwaveinterpretation #abnormalqvaves #ecg #ekg #ecgcourse #ecgmadeeasy #ecgonline #ecgreading #ecginterpretation #ekgonline #howtoreadecg

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
-------------------------------------------
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
-----------------------------------
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.

For more videos

   • Basics of P wave and abnormalities in ecg