Electrophysiology through the heart
Known as the natural pacemaker of the heart, this structure initiates the electrical impulse.
What is the Sinoatrial (SA) node?
What is the rate of normal sinus rhythm?
What is 60-100 bpm?
Is Atrial Fibrillation regular or irregular?
What is irregular?
What ECG component represents atrial depolarization and are typically round and upright?
What are P waves?
Name 1 cause of Sinus Tachycardia?
What is... increased O2 demands...
exercise; increased temp; infection; hypovolemia, dehydration; hypoxia; CHF, acute MI; sympathetic stimulation -> stress, fight or flight
This electrical gateway delays the impulse from the atria to the ventricles to allow the heart chambers to fill.
What is the Atrioventricular (AV) node?
What is the rate of A-fib RVR?
What is a rate of >100 bmp?
What ECG component represents ventricular depolarization?
What are qRs complexes?
Name 1 cause of Sinus Bradycardia.
What is...
athletes; increased vagal tone; medication -->calcium channel blockers, digitalis, beta blockers; Diseased SA node; hypothermia
This is the intrinsic firing rate (in beats per minute) of the SA node in a resting adult.
What is 60-100 bpm?
What ECG component represent ventricular repolrization?
What are T waves?
Name 1 risk factor that puts someone at higher risk to develop Atrial Fibrillation.
What is...
advance age; HTN; underlying heart disease (MI, valve problems, cardiomyopathy and heart surgery); alcohol use; sleep apnea; family hx; obesity; diabetes; thyroid problems; asthma.
This bundle of specialized fibers carries the electrical impulse down the interventricular septum.
What is Bundle of His (or AV bundle)?
Name 1 cause of a PAC?
What is...
CHF; MI or Injury; PE; Hypokalemia; Excessive use of Caffeine, Alcohol, Tobacco
These rapidly conducting, terminal fibers branch out from the bundle branches to distribute the electrical impulse directly to the ventricle muscle cells.
What are Purkinje Fibers?
The normal duration of a PR interval in normal sinus rhythm
What is 0.12-0.20 seconds?
In a junctional rhythm what ECG component can be missing, upside down, buried or after the QRS?
What is P wave?
What type of shock is delivered to a patient in pulseless ventricular fibrillation?
What is defibrillation?