Chapter 19: Heart and Neck Vessels Flashcards
Heart is located
between 2nd and 5th intercostal space, R border of sternum to L midclavicular line
Precordium
area on anterior chest overlying the heart and great vessels
Great vessels lie where?
bunched above the base of the heart
Pericardium
tough, fibrous, double walled sac that surrounds and protects the heart
Myocardium
muscular wall of the heart, does the pumping
Endocardium
thin layer of endothelial tissue that lines the inner surface of the heart chambers and valves
During diastole, AV valves
open during the hearts filling phase
During systole, AV valves
close to prevent regurgitation of blood back up into the atria
S1
occurs with the closure of AV valves and thus signals the beginning of systole.
S2
occurs with closure of the semilunar valves and signals the end of systole.
Where can you hear S1 heart sounds?
usually loudest at the apex, but heard throughout the precordium
Where can you hear S2 heart sounds?
loudest at the base, but heard throughout the pericordium
Extra heart sounds include
S3, S4, Murmurs
S3
some conditions create vibrations during ventricular filling, the vibrations are S3
S4
atria contract and push blood into a noncompliant ventricle which creates vibration that are heard as S4
Murmurs
- turbulent blood flow and collision currents against cardiac chambers and/or valves.
- gentle, blowing, swooshing sound that can be auscultated on the chest wall.
Cardiac output
equals the volume of blood in each systole (SV) times the number of beats per minute (rate)
Preload
blood filling in the ventricles
Afterload
push against force to contract
Neck Vessels include
carotid artery and external jugular
carotid artery
located between the trachea and sternomastoid muscle
jugular veins
internal and external jugular
internal jugular
lies deep and medial to the sternomastoid muscle
external jugular
superficial, lateral to the sternomastoid muscle, above the clavicle
Cultural and Genetic Considerations for Heart disease
increased incidence in African American population
Cultural and Genetic Considerations for HTN
African Americans highest incidence, also they develop HTN earlier in life and their average B/P’s are much higher.
Cultural and Genetic Considerations for Smoking
nicotine increases the risk of myocardial infarction and stroke by increasing the oxygen demand, but having a decrease in oxygen supply, changing lipid profiles and activating platelets and fibrinogen which are clot forming agents.
Cultural and Genetic Considerations for Cholesterol
whites, mexican americans and african americans - both male and female - highest groups of elevated LDLs which gradually contributes to thrombus formation in arteries and leads to MI’s and strokes