Card Set Information
ECG Interpretation Findings
What is PR Interval?
Time needed for:
SA Node stimulation,
Conduction thru AV Node (before Ventricles depolarize)
How Long is the PR Interval?
0.12 - 0.20 Seconds
3-5 small boxes
Causes of a Longer PR Interval Include?
1st degree block
Calcium Channel Blockers
What is the ST Segment?
Early Ventricular Repolarization.
Where is the ST Segment Located?
End of the QRS Complex to the Beginning of the T wave
What does and ELEVATED ST Segment Represent?
What Does DEPRESSED ST Segment Represent?
Left or Right Ventricular Hypertrophy
Left of Right Ventricula Bundle Branch Blocks
What is a P Wave?
Sinus Node spreading thru the Atria
What is the Normal Amplitude of the P Wave?
How Long is the P Wave?
Less than 0.11 seconds
What is the QRS Complex?
What is the Amplitude of the QRS Complex?
less than 5mm represented by qrs
Greater than 5mm represented by QRS
What is the Duration of the QRS Complex?
less than 0.12 seconds
3 small boxes
Where is Atrial Repolarization?
Hidden behind QRS Complex
What is the T wave Represent?
regaining negative charge
What is the U Wave represent?
Thought to be repolarizaion of Purkinje Fibers
What is the Physiological meaning behind the U Wave?
What are causes of Abnormally wide QRS Complex?
Left or Right Conduction impulses thru Bundle Branch
Early Electrical impulses (premature beats)
Conduction of impulses from Abnormal Accessory Conduction pathy that bypasses AV Node
Electrical Impulses that orginiate in an ectopic site in the ventricles
What Are the H's of H&T's?
Hydrogen ions (acidosis)
What are the T's of H&T's?
Thrombosis (coronary pulmonary)
Trauma (hypovolemia, Increase Cranial Pressure ICP)
What is Sinus Bradycardia?
Ventricular Rate or Atrial Rate less than 60pbm
Medication Treatment of Sinus Bradycardia includes?
*Atropine 0.5mg q3-5min max 3mg
**Rarely Catecholamines (Epinephrine, Norepinephrine, dopamine, metanephrine)
**Emergency Transcutaneous Pacing
What are Hypo (lower) Metabolic Needs?
What are Hypermetabolic Needs?
What are Vagal Stimulations?
What is Sinus Tachycardia?
Faster than normal impulse rate.
greater than 100 bpm but less than 120 bpm
What are Causes of Sinus Tachycardia?
Medications Causing Sinus Tachycardia Include:
Catecholamines(Dopamine, Norepinephrine, Epinephrine, Metanephrine)
Stimulants (Caffiene, alcohol, nicotine)
Illicit drugs (amphetamines, Cocaine, Ecstasy)
Treatment of Tachycardia Include
Identify and stop cause
: Beta Blockers & Calcium Channel Blockers
Catheter ablation of SA Node
What is POTS?
Postural Orthostatic Tachycardia Syndrome
What is the Treatment for POTS?
Increased Fluids and sodium
Use of Anti-embolism stocking to prevent pooling of blood in the lower extremities.
What is a Sinus Arrythmia?
Sinus Node Creates irregular rhythm (atrial & ventricular)
Rate Increase on Inspiration Decreases on Expiration
What is the usual treatment for Sinus Arrythmias?
Not usually trated because rarely causes any significant hemodynamic effect.