CORONARY CIRCULATION

Question 1

HOW MUCH OF THE CARDIAC OUTPUT DOES THE CORONARY CIRCULATION RECEIVE

Answer 1

5%

Question 2

What does the right coronary artery divide into ?

Answer 2

• right marginal

- posterior interventricular

Question 3

what does the left coronary artery divide into?

Answer 3

• anterior interventricular artery

- circunflex

Question 4

how is the systole and diastole in coronary circulation

Answer 4

opposite to the rest of the body due to systolic muscle contraction
VERY IMP IN LEFT VENTRICLE

Question 5

WHYS IS THE CHANGE IN SYSTOLE AND DIASTOLE IMP IN THE SUBENDOCARDIAL AREA?

Answer 5

RISK OF ISCHEMIA

Question 6

REGULATION OF CORONARY BLOOD FLOW

Answer 6

metabolism: if o2 needed then there is an increase of coronary blood flow (vasodilatation)
Autonomous sytem :
symp: β1 receptor- increase of metabolism
also α 1 (vasoconstriction ) but lesss
parasympathetic: no real role

Question 7

Coronary blood flow values

Answer 7

normal: 60-70 ml/100 gr

Question 8

how many times can the coronary blood blow increase?

Answer 8

flow can increase up to 5 times

Question 9

what is the option to increase the o2?

Answer 9

the only option is to increase coronary blood flow

Question 10

coronary flow reserve

Answer 10

capacity to increase flow

normally auto regulated

Question 11

factors that coronary blood flow reserve depends on ?

Answer 11

• width of epicardial vessels

- adequate vasodilatation of smaller arteries

Question 12

CARDIAC VENOUS RETURN: divisions of the coronary sinus

Answer 12

vena coronaria mayor
vena post del ventriculo izq
vena coronaria media
vena coronaria menor

Question 13

thebesian veins

Answer 13

veins that transports blood from coronary circulation right into the chambers