what happens if avr is positive ?

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what happens if avr is positive ?

Here are some links that might be useful to you:

https://www.reliasmedia.com/articles/136823-ecg-review-why-are-avr-waveforms-positive

https://www.reliasmedia.com/articles/136823-ecg-review-why-are-avr-waveforms-positive
ECG Review: Why are aVR Waveforms Positive? – Relias Media
Note also that a minus sign appears before the designation aVR. This is because the polarity of lead aVR is reversed when using the Cabrera format. As a result, the mirror image picture (i.e., global positivity rather than negativity) is displayed for aVR (within the blue rectangle in the figure).

https://litfl.com/ecg-limb-lead-reversal-ecg-library

https://litfl.com/ecg-limb-lead-reversal-ecg-library
ECG Limb Lead Reversal • LITFL • ECG Library Diagnosis
29 janv. 2024Lead aVR is directed towards the RA electrode (-150 degrees), calculated as follows: aVR = RA – (LA + LL)/2. Wilson’s central terminus. … Lead aVR often becomes positive; There may be marked right axis deviation; LA/RA reversal may simulate dextrocardia. However, in contrast to dextrocardia there is normal R wave progression in the …

https://litfl.com / lead-reversal-left-arm-right-arm-ecg-library

https://litfl.com / lead-reversal-left-arm-right-arm-ecg-library
Lead reversal: Left arm/right arm • LITFL • ECG Library Diagnosis
Quick guide to spotting LA/RA reversal. Lead I is completely inverted (P wave, QRS complex and T wave). Lead aVR often becomes positive. There may be marked right axis deviation. LA/RA reversal may simulate dextrocardia. However, in contrast to dextrocardia there is normal R wave progression in the precordial leads.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2898534

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2898534
aVR – the forgotten lead – PMC – National Center for Biotechnology …
Thus, lead aVR is the augmented unipolar right arm lead and may be considered as looking into the cavity of the heart from the right shoulder. It follows that all normally upright deflections on the ECG will, under normal circumstances, be negative in this lead ( 10 ). This makes aVR a valuable lead, which is discussed below.

https://oxfordmedicaleducation.com/ecgs/ecg-interpretation

https://oxfordmedicaleducation.com/ecgs/ecg-interpretation
ECG (EKG) Interpretation – Oxford Medical Education
Figure 1. Electrode positions on an ECG (EKG). When electrical activity (or depolarisation) travels towards a lead, the deflection is net positive. When the activity travels away from the lead the deflection is net negative. If it is at 90 degrees then the complex is ‘isoelectric’ i.e. the R and S wave are the same size.

https://litfl.com/r-wave-ecg-library

https://litfl.com/r-wave-ecg-library
R wave • LITFL • ECG Library Basics – Life in the Fast Lane
The most common cause of a dominant R wave in aVR is incorrect limb lead placement, with reversal of the left and right arm electrodes. This produces a similar pattern to dextrocardia in the limb leads but with normal R-wave progression in the chest leads. With LA/RA lead reversal: Lead I becomes inverted; Leads and aVL switch places

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4110611

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4110611
Significance of lead aVR in acute coronary syndrome – PMC
The current evidence suggests that the positive T wave in lead aVR is associated with cardiovascular mortality in the general population and patients with prior MI. Further studies are needed to clarify the underlying mechanisms for increased cardiovascular mortality in subjects with a positive T wave in lead in the general population and …

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6932132

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6932132
Clinical Value of Lead aVR – PMC – National Center for Biotechnology …
Lead aVL is at −30° relative to the lead I axis; aVR is at −150° and aVF is at +90°. Lead aVR is an augmented unipolar limb lead in which the positive electrode is on the right arm. aVR offers no specific view of the left ventricle and this is why it is mostly an ignored lead.

https://www.healio.com/cardiology/learn-the-heart/ecg-review/ecg-topic-reviews-and-criteria/limb-lead-reversal-review

https://www.healio.com/cardiology/learn-the-heart/ecg-review/ecg-topic-reviews-and-criteria/limb-lead-reversal-review
Limb Lead Reversal ECG Review | Learn the Heart – Healio
Limb Lead Reversal ECG Review | Learn the Heart – Healio

https://geekymedics.com/understanding-an-ecg

https://geekymedics.com/understanding-an-ecg
Understanding an ECG | ECG Interpretation | Geeky Medics
As a result, you see a positive deflection in all these leads, with lead II showing the most positive deflection as it is the most closely aligned to the overall direction of electrical spread. You would expect to see the most negative deflection in aVR. This is due to aVR providing a viewpoint of the heart from the opposite direction.
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