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09 CAC Cardiology

Chapter 29a The Paramedic William Chapleau

QuestionAnswer
3 layers of the blood vessel. Tunica intima, Tunica Media, Tunica Adventitia.
Frank-Starling mechanism. The more a cardiac muscle is stretched , the harder it will contract.
Action Potential Relationship between electrolytes (Sodium,Potassium,Calcium)
Action Potential change in electrolytes. Sodium moves IN, Potassium moves OUT, Calcium moves IN.
Portion of heart Right Coronary perfuses. Right Heart
Portion of heart Left Coronary perfuses. Left lateral wall and posterior portion of heart.
Location of Pressoreceptor and Chemoreceptors. Aortic Arch & Carotid Sinus of Carotid Arteries.
Sino-Atrial Node Located in right atrium. Intrinsic rate of 60-100.
Atrio-Ventricular Node Located in right atrium. Causes brief delay in impulse conduction so atria has time to contract and fill ventricles. Perfusion from right coronary.
Bundle of His Located in intraventricular septum. Intrinsic rate of 40-60.
Bundle Branches 1 on right side. 2-3 on left side.
Purkinje Fibers Last Pacemaker, Deep fiber network, intrinsic rate or 15-40.
Types of 3 leads Limb Leads, Augmented Leads, Precordial Leads.
Limb Leads Bipolar leads that represent the frontal plane activity.
Augmented Leads (AVL,AVR,AVF) Unipolar leads that allow for increased amplitude by 50% over limb leads.
Precordial Leads (V1,V2,V3,V4,V5,V6) Unipolar leads that look at horizontal plane of left ventricular.
Dr. Einthovens theory Left Arm is + or - , Right Arm is - , Left Leg is + ,
P Wave (Atrial Depolarization) 2.5mm in height less then .08 seconds
PR Interval (Conduction of impulses from Sinus through Atria through AV Junction) .12 - .20 seconds.
QRS (Ventricular Depolarization) .10 seconds or less.
First negative deflection from baseline before R Wave Q Wave
First positive Deflection, following Q if present. R Wave
Negative deflection following R Wave S Wave
ST Segment (Begining of Ventricular Repolarization) ST Segments elevated 1mm or more suspect for ventricular ischemia or injury.
T Wave (Ventricular Repolarization)
QT Interval (Total ventricular depolarization & repolarization) .40-.44 seconds. Prolonged QT can indicate potential life threatening dysrhythmias.
Small ECG Square .04 seconds , 1 mm
Large ECG Square .20 seconds , 5 mm
How many seconds in 15 Large Squares? 3 seconds
Ability to initiate an electrical impulse with out nervous system stimulation? Automaticity
Ability to recieve & respond to an electrical impulse? Excitability
Ability to contract when stimulated? Contractility
Strength of cardiac contraction? Inotropic
Influence on HR + chrontropic effect speed up HR Chronotropic
Pressure from flow of blood into Atria Preload
Movement of blood into ventricles w atria contraction Atrial Kick
Created by: SullenFF