Cardio Summary Flashcards
Main arteries of the Heart?
Left main coronary Art. which gives rise to LAD and Left circumflex Art.
RAD = right anterior descending and acute marginal Art.
Cardiac output=
MAP=
Pulse pressure=
CO = SV + HR
MAP = 2/3*Diastolic + 1/3 Systolic
Pulse pressure = Systolic - Diastolic
What causes an increased or decreased Pulse pressure
Increase is commonly due to:
Aortic regurgitation
Arteriosclerosis
Decrease is commonly due to:
HF
Aortic stenosis
What is the relationship between.
Increase SV and Contractility, Preload, Afterload, Catacholamines?
An increase SV can be due to: increase in Pre load Decrease in Afterload Increased Contractile force Catacholamines
Preload is dependant on?
and is reduced with what sort of drug?
Preload is dependant on BV and Venous tone
It is reduced with Venodilators
Afterload is dependant on?
and is reduced with what sort of drug?
Afterload is determined by LV size and MAP
Reduced with Vasodilators
An increase in EDV means what for contractile force?
Increase contractiltiy
A 1/2 in radius = what for resistance?
increase by 16 times
Order of Ion movements during depol in ventricular myocytes?
Na –> Ca –> K –> Na
What is responsible for the slow depol in AV/ SA nodes?
Funny channels leaking Na into the cell to give rise to its spontaneous depol
Where are Baroreceptors found?
Aortic Arch and Carotid sinus
Where are Chemoreceptors found?
Aortic Arch and Carotid Body
What Nerve is used by Aortic arch receptors?
Vagus Nerve
What nerve is used by the carotid body and sinus receptors?
Glossopharyngeal
Differnce between Peripheral and central chemoreceptors?
Peripheral detects, CO2, pH, O2
Central Detects, Co2, pH
