верхнее боковое отведение
superior lateral lead

Zobacz dyskusję w angielsko-rosyjskiej parze językowej
https://www.proz.com/kudoz/russian-to-english/medical-genera...

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Standardowe EKG wykonuje się przy pomocy 12 odprowadzeń:

3 dwubiegunowe kończynowe Einthovena (I , II , III),
3 jednobiegunowe kończynowe wzmocnione Goldbergera (aVR, aVL, aVF),
6 jednobiegunowych przedsercowych Wilsona (V1, V2, V3, V4, V5, V6).

https://pl.wikipedia.org/wiki/Elektrokardiografia

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In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle.[5]
https://en.wikipedia.org/wiki/Electrocardiography

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Orientation of the 12 Lead ECG
It is important to remember that the 12-lead ECG provides spatial information about the heart's electrical activity in 3 approximately orthogonal directions:

Right ⇔ Left
Superior ⇔ Inferior
Anterior ⇔ Posterior
Each of the 12 leads represents a particular orientation in space, as indicated below (RA = right arm; LA = left arm, LL = left foot):

Bipolar limb leads (frontal plane):
Lead I: RA (-) to LA (+) (Right Left, or lateral)
Lead II: RA (-) to LL (+) (Superior Inferior)
Lead III: LA (-) to LL (+) (Superior Inferior)
Augmented unipolar limb leads (frontal plane):
Lead aVR: RA (+) to [LA & LL] (-) (Rightward)
Lead aVL: LA (+) to [RA & LL] (-) (Leftward)
Lead aVF: LL (+) to [RA & LA] (-) (Inferior)
Unipolar (+) chest leads (horizontal plane):
Leads V1, V2, V3: (Posterior Anterior)
Leads V4, V5, V6:(Right Left, or lateral)
Lead Placement Diagrams:

https://ecg.utah.edu/lesson/1