Flow of electrical current of the Hearth

Were current begins

The site where electrical current originates in the heart, known as the sinoatrial (SA) node, acts as the primary pacemaker, initiating and regulating the heartbeat.

2nd stop of current

is the atrioventricular (AV) node, which receives impulses from the SA node and delays them briefly before sending them to the ventricles.

Also called the “gate keeper”

Where does current go after SA node?

The Bundle of HIS is a collection of heart muscle fibers that conduct impulses from the AV node to the ventricles, allowing for coordinated contraction.

Last stop of current

is the Purkinje fibers, which spread throughout the ventricles, facilitating their contraction in response to the electrical impulse.

Saying to remember order of Current

“Some Angry Bunnies Punch”

P wave

Atrial Depolarization
contraction of the Two atriums

QRS Complex

Ventricular Depolarization

contraction of the two ventricles
“Looks like a big ass V”

T wave

Ventricular Repolarization

"aka ventricular relaxing”

Where is Atrium repolarization"?

Hidden behind the QRS bc it is “louder”

PR Interval Time

0.12 to 0.20 seconds

QRS Duration Time

0.06 to 0.12 seconds

Fibrillation means:

Rapid, irregular and uncoordinated quivering of the muscle fibers. Can be atrial or ventricular.

Leads to ineffective blood pumping

Arrhythmia means:

Irregular Heartbeat

Tachyarrhythmia

Fast, irreglar rhythm

Depolarization leads to

Contraction

Repolarization leads to

Relaxation

P-R Segment

Follows the P wave

Demonstrates the delay the AV node creates

P-R Interval

Starts at beginning of P wave and Extends to the beginning of the QRS Complex

Demonstrates time it takes for electrical signal to go form atria to AV node

S-T Segment

Represents completion of ventricular depolarization dn the beginning of the ventricular depolarization

Should be flat as fuck (isoelectric)=cells are resting

Q-T Interval

Starts at the beginning of the QRS complex, and ends after T Wave

Represents the time it takes for electrical signals to cause the ventricles to contract and then rest

Long P-R Intervals could means

Heart Block