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Lecture 1

NURS 364 Lecture Notes - Lecture 1: Pulmonary Valve, Left Coronary Artery, Right Coronary Artery


Department
Nursing
Course Code
NURS 364
Professor
Deborah Van Kuiken
Lecture
1

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Alteration in Cardiovascular Systems
NURS 364 - Pathophysiology
Circulatory System
Heart
Located in the mediastinum
Right heart
Pumps blood through the lungs
Pulmonary Circulation
Left heart
Pumps blood through the various systems
Systemic Circulation
Cardiac Cycle
Conduction System of the Heart
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Automaticity--- Sa node starts impulse travels through atrium to Av node then goes into
ventricles spreads to tissue around two ventricles and spreads around heart. Ventricles
have some automaticity also but at a much slower rate
Cardiac Cycle
Diastole---- heart is filling muscle relaxed and blood comes into body from vena cava filling heart
or from pulmn art to left heart. Herat fills up then all valves shut… muscle contracts- builds
pressure then the Atrial valve and pulmonic valve open and the blood all leaves
Pulmonic and Aortic Valves closure
S2 heart sound
Isovolumetric relaxation (ventricles)
AV valves open & Ventricular filling occurs
Atrial contraction “atrial kick”
Coronary perfusion occurs at this phase of the cardiac cycle
Diastolic time is inversely proportional to heart rate
Preload
Amount of blood found in the ventricles at the end of diastolemeasure of volume
important because of another factor:force of contraction is related to preload better
preload= better contraction
Left Ventricular End Diastolic Pressure/Volume (LVEDP)
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Cardiac Cycle
Frank Starling Law of the heart
The greater the stretch (within physiologic limit) the greater strength of contraction
The greater the preload the greater the stretch & force of contraction and thus, the
greater the stroke volume
Factors that affect preload (LVEDP)
Venous return
Blood volume
Cardiac Cycle
Systole
Begins after closure of AV valves
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