Normal EKG

Question 1

P-wave

Answer 1

Upright in 1, 2, V4-V6 and AVF

Inverted in AVR (stars mean this is ALWAYS true)

Question 2

PR interval

Answer 2

.12-.20 seconds
Time from SA node to ventricular muscle fiber
Time from P-wave to beginning of QRS

Question 3

QRS complex

Answer 3

05-.10 seconds- if it is longer than this, you are thinking about a bundle branch block
Q-wave- .03 seconds long, seen in leads 1, AVL, AVF, V5 and V6

Question 4

ST segment

Answer 4

Checking to see if this is elevated or depressed from baseline
Can be elevated 1mm in standard leads and 2mm in chest leads- if there is higher elevation that could mean subepicardial enjury
If depressed more than .5mm that could mean subendocardial injury

Question 5

T wave

Answer 5

Inverted in AVR
Upright in 1, 2, V3-V6
Height no greater than 5mm in standard leads and 10mm in chest leads- if greater, could indicated hyperkalemia
Inverted/prominent T-wave could mean ischemic pattern

Question 6

Broad, wide notched (M-shaped) P waves may indicate

Answer 6

Mitral disease

Question 7

Enlarged, high amplitude P wave may indicate

Answer 7

P-pulmonale - lung disease

Question 8

Abnormal inversion of P wave may indicate

Answer 8

AV junctional rhythm

Question 9

Prolonged P wave my indicate

Answer 9

A-V block due to coronary disease

Rheumatic disease

Question 10

Multiple R-waves and/or S-waves could indicated

Answer 10

Bundle branch block

Question 11

Very large Q wave may indicated

Answer 11

Old infarction

Question 12

STEMI

Answer 12

ST elevation - myocardial infarction