rx l 1 p 2

What are the precordial leads?

V1, V2, V3, V4, V5, V6

Where is V1 placed?

4th intercostal space, right side

Where is V2 placed?

4th intercostal space, left side

Where is V4 placed?

5th intercostal space, left side along the midclavicular line

Where is V3 placed?

Between V2 and V4

Where is V6 placed?

5th intercostal space, left side along the midaxillary line

Where is V5 placed?

Between V4 and V6

What are the extremity unipolar leads?

aVR, aVL, aVF

Where is aVR placed?

Right arm delta fossa

Where is aVL placed?

Left arm delta fossa

Where is aVF placed?

Left side; above hip, below last rib

Where is the ground electrode placed?

Right side; above hip, below last rib

What are the 6 extremity leads?

I, II, III, aVR, aVL, aVF

What are the unipolar leads?

aVR, aVL, aVF, V1, V2, V3, V4, V5, V6

What are the bipolar leads?

I, II, III

How do you calculate HR using the large box method?

Count the number of large boxes between R waves; 300 ÷ number of large boxes between R waves

How do you calculate HR using the small box method?

Count the number of small boxes between R waves; 1500 ÷ number of small boxes between R waves

How do you calculate HR using the 6-second method?

Count the number of cardiac cycles within the 6-second hash marks, with the first R wave counted as 0; multiply by 10

study that chart thing and look at email

• Solid line = positive end (+) of that lead

• Dotted line = negative end (−) of the same lead

Normal: about −30° to +90°
Left axis deviation: −30° to −90°
Right axis deviation: +90° to +180°
Extreme axis deviation: −90° to 180° PET4551-LAB_EKG_pt2