The generation of pacemaking stimuli is called what?
The P wave represents what two actions in the heart?
The QRS represents what two actions of the heart?
1. Ventricular Depolarization
The T wave represents what action in the heart?
What two valves lie between the atria?
1. Mitral valve
2. Tricuspid valve
What level of heart muscle does the terminal end of the Purkinje Fibers lay?
Ventricular conduction is composed of Purkinje Fibers that use fast moving _____ ions for conduction.
What are the two phases of ventricular repolarization and what part of the EKG complex represents each phase?
1. ST segment - plateau phase
2. T wave - rapid phase
Ventricular Systole begins at the ___ and persists until the end of the ___ wave.
Ventricular Systole begins at the
and persists until the end of the
One little box on the EKG paper represents how many milliseconds?
One large box represents how many milliseconds on the EKG paper?
Patients with long QT syndrome are in danger of developing what?
Rapid Ventricular Rhythms
The release of free Calcium Ions into the interior of the myocytes produce mycardial ______.
The release of free Calcium Ions into the interior of the myocytes produce mycardial
Following depolarization, repolarization is due to the controlled outflow of ____ ions from the myocytes.
Following depolarization, repolarization is due to the controlled outflow of
ions from the myocytes
The smallest divisions of the EKG paper is how many MM squares?
Upward deflection on the EKG is described as _____.
Upward deflection on the EKG is described as
Leads I, II, and III are called what type of leads?
Dr. Wiliam Einthoven is known for what?
EKG placement leads, bipolar lead configuration
aVR, aVL, and aVF are known as ______ leads.
aVR, aVL, and aVF are known as
What neurotransmitter activates the heart's B1 adrenergic receptors?
Norepinephrine is the neurotransmitter that activates the heart's B1 adrenergic receptors.
Sinus bradycardia has a rate of <_____.
Sinus bradycardia has a rate of <
Junctional foci have an inherent rate of ___ to ___.
Junctional foci have an inherent rate of
Ventricular foci have an inherent rate of ___ to ___.
Ventricular foci have an inherent rate of
Merciful Syncope - Severe pain induces parasympathetic nervous system reflex and slows the SA node and lowers blood pressure
Neuro-Cardiogenic Syncope - prolonged standing stimulates sinus pacing but vasoconstriction fails
What is the normal PR interval?
The normal PR interval is <0.20 ms.
What is the normal QRS interval?
The normal QRS interval is < 0.12 ms.
If an impulse is moving towards a lead it will have a _________ deflection.
If an impulse is moving towards a lead it will have an
Phase II of the cardiac action potential is also known as?
Phase II of the cardiac action potential is also known as
Phase I of the cardiac action potential is known as?
Phase I of the cardiac action potential is known as
The left anterior descending artery supplies which wall of the heart?
The left anterior descending artery supplies the
wall of the heart.
The left circumflex artery suppplies which two walls of the heart?