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The Big One > Waveforms and intervals > Flashcards

Waveforms and intervals Flashcards

1
Q

P wave is what

A

atrial depolarization

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2
Q

PR interval is what?

How long is it normally

A

time for atrial depolarization and conduction from SA to AV node

.12-.2 sec

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3
Q

QRS complex is what

how long is it normally

A

ventricular depolarization and atrial repolarization

.06-.1 sec

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4
Q

QT interval is what

how long is it normally

A

ventricular depolarization and repolarization

.2-.4 sec

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5
Q

ST segment is what

A

isoelectric period following QRS when ventricles are depolarized

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6
Q

T wave is what

A

ventricular repolarization

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7
Q

1st degree AV block can be seen where on ECG?

A

longer PR interval than .2 seconds

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8
Q

2nd degree AV block (name both types) looks like what on ECG?

A

Type one: prolongation of PR interval until a QRS is not conducted

Type two: PR intervals are same and normal till QRS is dropped

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9
Q

3rd degree AV block looks like what on ECG

A

atria and ventricles depolarize at different times so P is not related to QRS complex. more atrial>ventrical

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10
Q

What may PAC’s be due to

A

general benign: caffeine, stres, smoking alcohol in normal individual

Heart disease

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11
Q

what is defined as an atrial rate of 250-350 bpm

A

atrial flutter

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12
Q

What dysrhythmia most often occurs with valvular disease especially mitral

A

atrial flutter

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13
Q

what is it called when atria depolarize between 350 and 600x per min

A

atrial fibrilation

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14
Q

what physiologically happens with 3rd degree AV block

A

CO drops and pt may faint

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15
Q

what does PVC look like on ECG

A

absent P wave, wide and bizzare QRS

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16
Q

ventricular tachycardia is defined as what

A

3 or more consecutive PVC’s at a ventricular rate of >150 bpm

17
Q

Vtach lasting how long is life threatening

A

lasts >30 seconds: likely incredibly hypotensive, may lead to v-fib

18
Q

V-fib what about it

A

immediate medical emergency: no CO

19
Q

what is ventricular astyole

A

no output what-so-ever

CPR!

20
Q

Name Four signs of myocardial ischemia and infarction of ECG

A

ST segment depression of 1-2mm: could also be due to hypokalemia, and digitalis toxicity

ST segment elevation 1-2MM: transmural infarction, COULD BE NORMAL

Q-wave: loss of electrical voltages due to necrosis (larger than 1/3 amplitude of R wave)

T wave inversion: hours or days after MI due to delay in ventricular repolarization, CVA, R and L bundle branch blocks, COULD BE NORMAL IN CHILDREN AND SOME ADULTS

The Big One (18 decks)

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