ECG Analysis & Interpretation Guide 2025: Steps, Examples & Tips

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ECG Analysis: Rhythm Recognition (Relias)

where is the heart located in the chest? .....ANSWER.....between

the lungs in the mediastinum

where is majority of the heart located .....ANSWER.....left of the

midline

what is the outer layer of the pericardium called

.....ANSWER.....fibrous pericadium

what are the layers of the heart and their functions?

.....ANSWER.....fibrous pericardium

parietal layer(serous)

pericardial cavity

visceral/epicardium(serous)

what is the role of the fibrous peridcardium .....ANSWER.....limits

the motion of the heart and prevents over distention when the

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heart contracts, anchors the heart in the mediastinum, protects the

heart

how many layers does the serous pericardium have and what

does it do ? .....ANSWER.....two layers, helps lubricate the heart

to reduce friction between layers

what are the two layers of the serous pericardium?

.....ANSWER.....parietal layer and visceral layer, or epicardium

what is the space between the parietal layer and visceral layer

called? .....ANSWER.....the pericardial cavity

what major components run down the heart within the

epicardium? .....ANSWER.....the left and right coronary arteries

what can be found within the pericardial space

.....ANSWER.....15 to 50 ml of pericardial fluid

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what is significant about the myocardium(middle layer)

.....ANSWER.....comprised of involuntary striated muscle, it is this

layer that contracts to pump blood

what can be found in the endocardium(inner most layer of the

heart) .....ANSWER.....Purkinje Fibers

what is the role of the Purkinje Fibers found in the endocardium?

.....ANSWER.....depolarize surrounding cells to initiate a

contraction in the heart

how does the endocardial endothelial tissue play a vital role in

maintaining cardiac function? .....ANSWER.....releases compounds

such as endothelin and nitrous oxide that influence cardiac

conduction, contraction, rhythm, and metabolism

what is endothelin .....ANSWER.....a peptide, or small protein that

constricts blood vessels and raises blood pressure

what is the role of the right atrium of the heart?

.....ANSWER.....receive deoxygenated blood from peripheral and