ECG

Question 1

what is a ecg

Answer 1

used to record the electrical activity of the heart from different angles.

Question 2

how are ecgs recorded?

Answer 2

by placing electrodes on a patient

Question 3

what is a 12 lead ecg

Answer 3

generated by 10 electrodes attached to the patient

Question 4

what do p waves represent?

Answer 4

represents atrial depolarization ( a change within the cell from the elctrical charge)

Question 5

what does the PR interval represent?

Answer 5

the time it takes for a electrical charge to get from the atria to the ventricles

Question 6

what does the ST segment represent?

Answer 6

the time between depolarizing ation and repolarization of the ventricles

Question 7

what does the qt interval mean?

Answer 7

the time taken from the QRS wave to the T wave for the ventricles to depolarize and repolarize

Question 8

what is a patients normal heart rate?

Answer 8

60-100bpm

Question 9

what is a techycardia (fast) average heart rate

Answer 9

100>bpm

Question 10

what is a bradycardia average heart rate?

Answer 10

<60bpm

Question 11

how would you calculate a heart rate of someone who is regular?

Answer 11

count the number of large squares within 1 r-r interval and divide by 300

Question 12

how would you calculate somebody’s heart rate who is irregular?

Answer 12

count the number of QRS complexes on a rhythm strip, multiply by 6= how many there is in 1 minute.

Question 13

what does the cardiac axis represent?

Answer 13

overall direction of electrical activity.

Question 14

in a healthy individual, where should the lines of a cardiac axis place?

Answer 14

between -30 degrees and 90

Question 15

when the electrical activity is travelling towards a ECG lead there is there a positive or negative deflection?

Answer 15

positive

Question 16

when the electrical activity is travelling towards a ECG lead there is there a positive or negative deflection?

Answer 16

negative

Question 17

how long should the P wave be?

Answer 17

120-200ms (3-5 small squares)

Question 18

how many seconds does 5 large squares equal?

Answer 18

1 second

Question 19

how many sqaures equal to 1 minute

Answer 19

300 large squares

Question 20

were do the V1 red electrode go

Answer 20

4th intercostle space on the right edge

Question 21

were do the v2 yellow electrode go

Answer 21

4th intercostal space on the left

Question 22

were does the v3 green electrode go

Answer 22

midway between the v2 and v4 electrodes

Question 23

were does the v4 blue electrode go

Answer 23

5th intercostal space in the midclavicular

Question 24

were does the v5 orange electrode go

Answer 24

left anterior, same horizontal level as v4

Question 25

were does the v6 purple electrode go

Answer 25

left mid axillary same horizontal as v4 and v5

Question 26

were does the 3 electrodes go on a 3 lead ECG

Answer 26

RA and LA under the collerbone
LL- lower edge of the left ribcage