Assessing Cardiac Function Flashcards
(48 cards)
why is maintaining cardiac function important?
- circulation
- blood pressure
- perfusion of vital organs and adaptability to change to emotions/stress
The hearts function as a pump
- regulates HR and rhythm
- Chambers and valves/structures
- contraction (regularity and strength)
what does MET stand for
Metabolic equivalent of Task
what is MET measure of
a physiological measure expressing the energy cost of physical activity
1MET =
1Kcal/kg/h
The reference metabolic rate is set by convention to
3.5 ml O2·kg−1·min−1
what is the average expenditure of energy at rest?
3.5 ml O2·kg−1·min−1
1MET
resting
2MET
Eat, move and go to the toilet
4MET
light house work
still a dangerous group dot be in if its the max
10MET
safe level, good functional level - can do light sport
stress testing includes
treadmill and bicycle egonometer
stress testing is putting the body under
physiological stress - moving/excersising
how would you test for ischaemia
- exercise using the treadmill stress test
what would you test before heart surgery to work out how healthy/fit a person is?
ECG leads, cardiopulmonary testing, testing gases/saturationin the blood, total energy used during the activity
- try and get the patient to 5MET
what is the excersise treadmill test looking for
looking for any abnormalities, CHD with the ECG
where do you put the ECG leads?
over the main coronary arteries
what would you see on the ECG when the patient is starting to struggle and want to stop exercising?
the STZ wave drops down
what are you looking for on the ECG of the
- looking for changes at the peak of exercise
- T wave inversion
(V2 and V3 leaders have inversion of the T wave)
T wave inversion is typical of
impairment of the blood vessels in the heart
what would some of us with the healthy people in the low risk group have with the treadmill test
false positive tests - this test should be carried out on people who have chest pains etc - more of a discriminator then
what test would have low false positives?
coronary angiogram
If patient is UNLIKELY to have disease to start with, an abnormal test has greater chance of being a
false positive
- influences pre-test probability of CAD on post test probability of CAD
what other factor influence pre-test probability of CAD
age sex and symptoms
