What are the five steps of calculating a heart rhythm? - Precise Answer -Step 1: Calculate rate.
-Step 2: Determine regularity.
-Step 3: Assess the P waves.
-Step 4: Determine PR interval.
-Step 5: Determine QRS duration.
Schematic representation of a normal ECG. - Precise Answer
What is...
What are the five steps of calculating a heart rhythm? - Precise Answer ✔✔-Step 1: Calculate rate.
-Step 2: Determine regularity.
-Step 3: Assess the P waves.
-Step 4: Determine PR interval.
-Step 5: Determine QRS duration.
Schematic representation of a normal ECG. - Precise Answer ✔✔
What is the first option for calculating heart rate? - Precise Answer ✔✔Count the number of R waves in
a 6 second rhythm strip, then multiply by 10.
What is the second option for calculating heart rate? - Precise Answer ✔✔-Find a R wave that lands on
or next to a bold line.
-Count the number of large boxes to the next R wave. If the second R wave is 1 large box away the rate
is 300, 2 boxes - 150, 3 boxes - 100, 4 boxes - 75, etc.
What is the sequence of heart rates to memorize? - Precise Answer ✔✔300 - 150 - 100 - 75 - 60 - 50
How do you determine regularity of an ECG? - Precise Answer ✔✔Look at the R-R distances. If they are
equidistant, the ECG is regular.
What is a P wave? - Precise Answer ✔✔During normal atrial depolarization, the main electrical vector is
directed from the SA node towards the AV node, and spreads from the right atrium to the left atrium.
This turns into the P wave on the ECG.
What questions do you ask to assess the P waves (4)? - Precise Answer ✔✔-Are there P waves?
-Do the P waves all look alike?
-Do the P waves occur at a regular rate?
, -Is there one P wave before each QRS?
What is the normal P-R interval? - Precise Answer ✔✔0.12 - 0.20 seconds
(3 - 5 boxes)
What is the normal QRS interval? - Precise Answer ✔✔0.04 - 0.12 seconds
(1 - 3 boxes)
What are the normal rhythm parameters of a normal sinus rhythm? - Precise Answer ✔✔-Rate 60 - 100
bpm
-Regularity regular
-P waves normal
-PR interval 0.12 - 0.20 s
-QRS duration 0.04 - 0.12 s
Any deviation from normal sinus rhythm can be what (3)? - Precise Answer ✔✔-Sinus tachycardia
-Sinus bradycardia
-Arrhythmia
Arrhythmias arise from problems in what (4)? - Precise Answer ✔✔-Sinus node
-Atrial cells
-AV junction
-Ventricular cells
What is the sequence of normal impulse conduction (5)? - Precise Answer ✔✔-Sinoatrial node
-AV node
-Bundle of His
-Bundle branches
-Purkinje fibers
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