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16 Cards in this Set
- Front
- Back
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Normal calibration
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2 big boxes
10 mm 10 mm = 1 mV |
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EKG grid dimensions
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Small box = 1 x 1 mm
Big box = 5 x 5 mm Small box horizontal = 0.04 s Big box horizontal = 0.2 s Small box vertical = 0.1 mV Big box vertical - 0.5 mV 1 x 1 mm = 1 small box 5 x 5 mm = 1 big box |
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Sinus rhythm
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1. P followed by QRS
2. QRS preceded by P 3. P > 0.12 s or 3 small boxes 4. P upright in leads I, II, and III |
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Methods for calculating HR
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1500
--------------------------- mm between peaks 300-150-100-75-60-50 # peaks in 3 seconds x 20 # peaks in 6 seconds x 10 |
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Normal interval lengths
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PR = 0.12 - 0.20 s or 3 - 5 small boxes
QT < half R-R interval QRS < or = 0.10 s or 2.5 small boxes |
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QRS axis determination
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Lead I = negative QRS = RAD
Lead II = negative QRS = LAD Normal axis = -30 to 90 degrees |
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Limb lead orientations
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Lead I = R arm to L arm, 0 degrees
Lead II = R arm to L leg, 60 degrees Lead III = L arm to L leg, 120 degrees aVR = R arm, -150 degrees aVL = L arm, -30 degrees aVF = feet, 90 degrees |
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RA hypertrophy
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P height > 2.5 small boxes in lead II
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LA hypertrophy
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Negative P > 1 x 1 mm in lead V1
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RV hypertrophy
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R > S in lead I
RAD |
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LV hypertrophy
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R in leads V5-6 + S in lead V1 > 35 small boxes
LAD |
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RBBB
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Widened QRS
RSR' in lead V1 = rabbit ears Large S in lead V6 |
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LBBB
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Widened QRS
Broad notched R in lead V6 Absent R and large S in lead V1 |
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Pathological Q waves
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Present in leads over necrotic tissue
Signifies MI |
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Acute STEMI
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Elevated ST
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Acute non-STEMI
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Depressed ST
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