Clin Lab - EKG rate

Question 1

What does heart function tell us?

Answer 1

• Electrical conduction system
• Infarction

Question 2

What does heart structure tell us?

Answer 2

• Hypertrophy
• Axis

Question 3

Does the EKG tell us if the heart beats?

Answer 3

NO

Question 4

How do we assess if a heart is actually beating?

Answer 4

pulse

Question 5

What is the dominant pacemaker of the heart?

Answer 5

SA node

Question 6

Where is the SA node located?

Answer 6

posterior (top) right atrium

Question 7

How does the parasympathetic and sympathetic nervous system affect the SA node?

Answer 7

controls how many Na+ channels are opened or closed

Question 7

When do you not use the 300-150-100 count? what do we uses?

Answer 7

• bradycardic rates
• very irregular rates
• uses 6 sec method for these rates

Question 7

Any rhythm originating from the SA node is called a _____

Answer 7

sinus rhythm

• regular, consistent P wave

Question 8

SA node: normal rate

Answer 8

60 - 100 bpm

Question 9

If the SA node isn’t working, name the backup system in place to pace heart.

Answer 9

• Atrial foci (Ectopic atrial)
• Atrioventricular (AV) node junction (Junctional)
• Ventricular Foci (Idioventricular)

Question 9

Atrial foci (Ectopic atrial) Rate

Answer 9

60 - 80 bpm

Question 9

AV node junctional Rate

Answer 9

• typical junctional rate 40 - 60 bpm
• accelerated junctional rate 60 - 80 bpm

Question 9

3 ways to calculate rate

Answer 9

• 300-150-100
• 6 sec count
• 10 sec

Question 10

Ventricular foci (idioventricular) Rate

Answer 10

• typical 20 - 40 bpm
• accelerated idioventricular rate 40 - 60 bpm

Question 10

Describe the 300-150-100 count & what part of the EKG is used?

Answer 10

300-150-100-75-60-50

• use 10 sec rhythm strip

Question 11

Describe how to used the 300-150-100 count

Answer 11

1. find an R wave that fall on the big box block line
2. start counting each big box line after that
3. If the second wave fall b/t two big box lines; calculate what little boxes would equal

Question 12

Describe 6 sec count.

Answer 12

Count the # of R waves in a 6 sec interval & multiply by 10

Question 12

Describe 10 sec count.

Answer 12

If it is a 10 sec EKG, count total number of QRS complexes & multiply by 6

Question 12

How can you determine if a rhythm is irregular?

Answer 12

measure the R-R interval

Question 12

What must be present on the EKG to use 6 sec count?

Answer 12

hash marks