ECG

Question 1

P Wave

Answer 1

Atrial Depolarization
= right before atria contract and push blood into the
ventricles

Question 2

PR Interval

Answer 2

electrical conduction
–>from SA node to ventricles

Question 3

QRS Complex

Answer 3

Ventricular Depolarization
–> ventricles contract and push
blood out to the aorta or pulmonary system

Question 4

ST Segment

Answer 4

entire myocardium= depolarized

Question 5

T Wave

Answer 5

Ventricular Repolarization
–> ventricles relax in order to fill with
blood for next heart cycle

Question 6

Sinus Bradycardia/Tachycardia

Answer 6

HR <60/ HR= 100-160

Question 7

Angina ECG change

Answer 7

ST Segment depression
- Occur during the angian
- return to baseline afte angina attack passed

Question 8

Post MI ECG Change

Answer 8

T Wave peak (become tall and narrow)
- Revesible ischemic damage
- occur within first few minutes of MI

ST Segment Elevation/ T wave inversion
- occur within hours of MI
- indicate onset of tissue necrosis

Pathological Q Waves
- days after initial MI
- NOT always present on EKG after MI
- indicate permanent myocardial tissue damage and will always remain in
repeat EKG if they were present during initial MI
- Represent an absence of electrical activity due to scarring
- After weeks/months, only the pathological Q wave will be apparent

**Temporary damage= T wave peak–>ST elevation & T wave inversion
- will disappear after a few weeks

Question 9

Cause of heart arrhythmia

Answer 9

• Myocardial tissue damage
• Electrolytes imbalance
• Severe infections
• Medications
• Stimulants
• Congenital abnormalities

Question 10

Sign & Symptoms of dec CO

Answer 10

Sign:
- Sweating
- Paleness
- Irregular pulse
- Abnormal blood pressure
- Vomiting
- LOC

Symptoms:
- Light-headedness
- Fatigue
- Angina
- SOB
- Anxiousness
- Nausea