ecg Flashcards
What are the steps in evaluating an ECG rhythm strip?
Look at the rhythm to see if it is regular Estimate the atrial rate Look for the P waves Measure the QRS complex Look for the T waves Measure the PR interval Measure the QT interval and calculate the corrected QT interval Look at the ST Segment Determine the clinical significance
When looking at the P waves, what is one looking for?
Do all P waves have the same morphology?
Is there one and only one P wave associated with each QRS?
What is the normal range of the QRS complex?
120 milliseconds or less
What should one look for in the T waves?
Should have same morphology
Direction of T wave should be the same as the main vector of the QRS
Should be less than 5mm in amplitude in limb leads
Less than 15 in precordial leads
A QTc interval greater than how many milliseconds is considered prolonged?
460
What leads are provided by the 5-lead ECG?
I, II, II, aVR, aVL, aVF
V1
What leads are provided by the 12-lead ECG?
I, II, II, aVR, aVL, aVF
V1, V2, V3, V4, V5, V6,
What are some causes of bradycardia?
Vagal stimulation MI Hypoxia Medications Coronary artery disease Hypothryoidism Iatrogenic illness Inflammatory conditions
Signs and symptoms when sinus bradycardia effects cardiac output:
Dizziness or light-headedness Syncope Fatigue Shortness of Breath Confusion or memory problems
What is also called Mobitz type I or Wenckebach block?
Second Degree AV block Type 1
What is also called Mobitz type II
Second degree AV Block Type 2
How does first-degree AV block appear on ECG?
Normal P waves followed by QRS complex but PR interval exceeds 200 milliseconds
How does second-degree AV Block, Type I appear on ECG?
Ratio of P waves to QRS complexes is greater than 1:1
Each impulse is delayed a little more than the last until eventually one is completely blocked
How is the ECG for Second-degree AV block type II characterized?
Constant PR interval, but because impulses are intermittently blocked, there are more P waves than QRS complexes
How is Third-degree AV block characterized on ECG?
No electrical communication between atria and ventricles. No relationship between P waves and QRS complexes
