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CPR > EKG > Flashcards

EKG Flashcards

1
Q

Know this

A
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2
Q

PR segment?

A
  • Segment preeceeding activation of QRS
  • How long it takes for SA node to send signal and AV the ventricle mm fibers to recieve it
  • 0.12-0.20 seconds
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3
Q

What is the first negative deflection and second?

A
  • Q
  • S
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4
Q

ST segment

A
  • at isoelectric point, may be half mm above
    • not normal to be depressed more than half a mm
      • ST depression: Subendocardial injury
      • ST elevation: subepicardial or transmural injury
  • period between QRS and T wave, how long ventricles are depolarizing
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5
Q

QT interval

A
  • should be less than half of previous R-R interval
  • Length of time during ventricular systole
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6
Q

How should the P wave look on 1,2, (limb leads) and V4,V6 (chest leads), AVF, AVR?

A
  • Upright in 1,2,V4,V6, AVF
  • Inverted in AVR
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7
Q

ORS complex, describe Q wave

A
  • Q wave not greater than 0.03 in width
  • Q waves are small and narrow in AVL, AVF, V5 and V6
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8
Q

Describe T wave direction in different leads?

A
  • Upright in 1,2,V3-V6
  • Inverted in AVR
  • Variable in 3, AVL, AVF, V1-2
  • height not greater than 5 mm in standard leads or 10mm in precordial leads
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9
Q

What is the T wave assoc with when it is inverted or very tall and peaked?

A
  • Inverted: ischemic pattern
  • Tall: hyperkalemia
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10
Q

Where do lead 1, AVL, V5 V6 pick up information and 2,3,AVF and

V1-4?

A
  • 1, AVL, V5 V6 are lateral wall heart
  • 2,3,AVF components in inferior diaphragmatic portion
  • V1-4 pick up activity over anterior portioin
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11
Q

What can shorten a PR interval?

A
  • AV jxnl and low atrial rhythms
  • Wolff parkinson white syndrome
  • Lown ganong levine syndrome
  • Glycogen storage disease
  • Htn
  • normal variationi
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12
Q
A
  • D is right bundle branch block
  • Inverted Q previous MI
  • Picture shows variation, you can have R waves with no Q, inverted waves, and missing waves
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13
Q

If there is no Q wave can you have an R wave?

A

Yes, first up right deflection is R whether there is a Q wave or not

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14
Q

ST segments

A

This is all artifact

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15
Q

What are the best leads for reading P waves?

A

Lead II and V1

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16
Q

On the ECG each dark line represents __ and each smaller box represents ___.

A
  • 0.20 sec
  • 0.04 sec
17
Q

What is the rate?

A
  • ~125 BPM
  • each big line is 300 150 100 75 60 50 43
  • HR per min =300 divided by # large squares
18
Q

Rate

A
  • physiologic sinus arrythmia, this is normal as you inhale rate increases and exhales as you decrease
  • second R wave ~75 BPM
19
Q

What could be going on if P wave comes after QRS? What is rate?

A
  • SVT
  • Junctional rhythm seen in the picture
  • rate is ~65-70 BPM
20
Q

What is 1 2 and 3 perpendicular to?

A
  • 1 perpendicular to AVF
  • 2 perpendicular to AVL
  • 3 perpendicular to AVR
21
Q

What is axis?

A
  • look at AVF, is it running positive or negative
  • Look at Lead I, is it positive or negative
  • axis is btw 0 and 90 as both are positive
22
Q

Normal axis should have positive deflection of leads ___ &___.

A
  • lead I and aVF
23
Q

Describe what a left axis looks like.

A
  • If lead one is positive and aVF is negative
24
Q

Describe right axis

A
  • negative lead I
  • Positive aVF
25
Q

Lead I is positive and aVF is negative, what is the axis?

A

left axis (-30 to -90)

26
Q

rate? axis?

A

Rate: ~40 BPM

27
Q

rate and axis?

A
  • ~75 bpm
  • 1 and F are both positive so normal quadrant
  • aVR perpendicular to lead III
    • +30 degrees
28
Q
A

*

CPR (18 decks)

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