Cardio day 2 Flashcards
What is a Normal Resting CO
5-6L/min
What is a Normal Resting Rate of the SA node
60-100bpm
What is the pacemaker of the heart
Sinoatrial Node (SA Node)
What is a Normal Resting Rate of the Atrioventricular Node (AV Node)
(40-60 bpm)
What is a Normal Resting Rate of the Purkinje Fibers
(20-40 bpm)
depolarization means
an electrical impulse that causes contraction of an area.
A refractory period is when
the heart cant pulse because it needs to repoloarize
What is (systole)
a sequence of atrial/ventricular CONTRACTION caused by cell DEPOLARIZATION
What is(diastole)
relaxation caused by repolarization (Return of the heart to its previous resting state, the relaxation of the myocardial muscle.)
How narrow should a QRS complex be
less than 100ms wide
What does the p wave show
contraction of the atria (don’t need much power to contract so hill is smaller) refilling of atria happen during QRS
What does the t wave show
repolarization (refilling) of the VENTRICLES
Each small square measured horizontally on an ECG represents_____ seconds in time.
0.04
Each small square measured vertically on an ECG represents the voltage, or amplitude, as __ mm of height.
1
To accurately review a rhythm strip you need a___second strip (measured by notches as top or bottom of strip)
six
IS PT IS HAVING A PROCEDURE ON A STEP DOWN UNIT, YOU SHOULD USE TELEMETRY OR A HARDWIRE MONITOR
USE HARDWIRE NOT TELEMETRY SINCE HARD WIRE IS USED DURING PROCEDURES
Difference Between Cardiac Monitoring and 12-Lead EKG
12 LEAD LOOKS AT ALL ASPECTS OF THE ELECTRICITY OF THE HEART, MORE LEADS THAN
Cardiac monitoring is continuous monitoring used for individuals who are in critical care, does not look at multiple aspects of the heart. If wonky might order an EKG
T/F: LEAD 2 SHOULD ALWAYS BE UPRIGHT AND POSITIVE
True
What are the 5 steps to Analyzing Cardiac Rhythms
Determine regularity (top of QRS to top of QRS). if they vary more than 0.12 seconds the rhythm is considered irregular
Calc HR: Multiply number of QRS complex by 10
Identify a P wave (size, shape, and position)
Measure P-R interval (must 5 or less boxes or Count the number of small squares and multiply by .04 seconds (normal .12-.20 sec))
Measure QRS complex
If the length between R’s in QRS complexes vary more than 0.12 seconds the rhythm is considered _________.
irregular
How do you calculate HR on a 6 second ECG strip
MULTIPLY NUMBER OF QRS COMPLEXES BY 10
IF A PR INTERVAL IS ABNORMALLY LONG IT COULD MEAN
THERE’S AN ISSUE WITH THE SA NODE (HEART BLOCKS)