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326 Exam 3 (Cardiology,GI,Endocrine) > Dysrhythmias > Flashcards

Dysrhythmias Flashcards

1
Q

Cardiac Muscle Cells do 4 things

A

Automaticity
Excitability
Conductivity
Contractility

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2
Q

Automaticity

A

Ability to generate an electrical impulse

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3
Q

Excitability

A

ability to respond to an outside impulse (chemical, electrical, mechanical)

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4
Q

Conductivity

A

Ability to receive an electrical impulse and conduct it

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5
Q

Contractility

A

Ability of myocardial cells to shorten in respond to an impulse (muscle cells)

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6
Q

Atrial Depolarization

A

P-Wave
(Atriums squeeze)
Atrial systole

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7
Q

Ventricle Depolarization

A

QRS Complex
(Ventricles squeeze)
Ventricular systole

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8
Q

Repolarization

A

FILLING

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9
Q

Atrial Repolarization:

A

within QRS complex

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10
Q

Ventricular Repolarization:

A

T-Wave

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11
Q

Action Potential

A

Sodium + Potassium mediated (atp pump)

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12
Q

SA Node

A

Stimulates Atria to contract (P-Wave)/atrial depolarization

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13
Q

AV Node

A

Stimulates Ventricles to contract

(QRS)/Ventricular depolarization

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14
Q

Electrical Conductivity of Heart

A
  1. SA node
  2. Atrial Depolarization
  3. AV node
  4. Ventricular Depolarization
  5. Ventricular Contraction
  6. Ventricular Repolarization
  7. Nothing
  8. SA node…..
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15
Q

Bundle of His + Purkinje Fibers

A

Tell Ventricles to do their thing

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16
Q

Normal Electrical Conductivity of Heart (Sinus Rhythm)

A

SINUS RHYTHM:

Rate: 60-100
Rhythm: Regular

P-Wave:

  • Upright + rounded
  • One before every QRS
  • Regular rhythm

PR interval:
-0.12-0.20 sec

QRS: < 0.12 sec

17
Q

PR Interval time (sinus rhythm)

A

0.12-0.20 sec

18
Q

QRS time (sinus rhythm)

A

< 0.12 sec

19
Q

Sinus Arrhythmia

A

A degree in variability in the HR

  • Common among young people
  • HR fluctuates with respiration or autonomic nervous system

*Intervals P-P are different

326 Exam 3 (Cardiology,GI,Endocrine) (19 decks)

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