Unit 3 A Flashcards
1
Q
Cation Movement in Depolarzation
A
- Na moves into cell (first phase)
- Ca moves into cell (second)
- K moves out of cell in response to NA and Ca
2
Q
P Wave
A
- Atrial depolarization
- 0.12 seconds
3
Q
PR Interval
A
- Shows SA and AV node fxn
- Normal 0.12-0.2 s
- Greater than 0.2 is indicative of block
4
Q
QRS Complex
A
- Ventricular depolarization
- Q not always present
- Normal: 0.04-0.10 s
5
Q
Sinus Bradycardia: Tx
A
- Check meds: Dig, Beta-Blockers, and CCBs can cause bradycardia
- Can be caused by vagal maneuvers (Vomiting, coughing, constipation)
- *If symptomatic give *Atropine (DOC), Epi, Dopamine
6
Q
Sinus Tachycardia: Tx
A
- *Treat cause, not rate: Anxiety, fear, fever, pain, hypovolemia
- Must have a P wave to be Sinus Tachy
7
Q
Sinus Tachycardia
A
-HR greater than 100 with regular rhythm
and regular intervals
-Usually asymptomatic, but can worsen to heart failure
8
Q
Second Degree block: Difference in Type I and Type II
A
- Type 1: PR interval progressively lengthens, then drops a QRS
- Type II: PR interval is constant, then drops a QRS
9
Q
3rd Degree Heart Block v. Sinus Arrest
A
- 3rd degree heart block, the sinus pause ends with a junctional escape beat (no P wave)
- Sinus arrest, the sinus pause ends with a sinus beat (P wave)
10
Q
Class I Antiarrhythmics
A
- Lidocaine and Procainamide
- Decreases cellular permeability to Na
- Do not use with AV blocks
11
Q
Class II Antiarrhythmics
A
- Labetalol (vasodilator), Propranolol (treats SVT and PVCs), Atenolol (used in post MI to prevent Vfib), Metoprolol (Treats MI, increases perfusion to heart)
- B-Blockers
- Increase coronary artery blood flow
12
Q
Class III Antiarrhythmics
A
- Amiodarone (or Amurowdarun?)
- Treats Vtach and Vfib when other meds are ineffective
- Long half life
- Pt must be admitted
13
Q
Class IV Antiarrhythmics
A
- Diltiazem, Verapamil
- Treat Afib, Aflutter, and SVT
- May cause AV block
- Caution with CHF, AMI, cardiogenic shock, and B-blockers
