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A 31-year-old member asked:

On an ecg, what does a "persistent s-wave ( v5-v6 )" mean?

1 doctor answer2 doctors weighed in
Dr. Bennett Werner
Cardiology 44 years experience
Not much: on the ECG, the first downward deflection that follows the dominant upward deflection is called an "S" wave and is part of the depolarization complex (called a "QRS complex"). Classically, the S wave is tiny or absent in V5-6. When the S wave is deep, the term "clockwise rotation" is used. (your heart is rotated in your chest) It doesn't connote any pathology. Not to worry.

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A 33-year-old member asked:

Can you tell me if on an ecg, what does a "persistent s-wave ( v5-v6 )" and mean?

2 doctor answers3 doctors weighed in
Dr. Stanley Berger
Cardiology 33 years experience
Depends: A small S wave in these leads is usually normal. A prominent S-wave may be seen in patients with right sided overload conditions, such as pulmonary disease. A large S wave in V1 and lead I when the QRS is wide is seen in right bundle branch block (RBBB). In rare cases, a person with dextrocardia may be diagnosed by ECG with one feature being a persistent s-wave in V5-V6. Review with your doctor.

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Last updated Oct 20, 2019

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