Lab 5- EKG after MI Flashcards
(28 cards)
purpose of stress test
determine heart rate that challenges the cardiovascular system and does not yet cause signs or symptoms, including EKG changes
APMHR
age predicted maximum heart rate
220- age
target heart rate (THR) range
70% to 85%
THR for stopping stress test
85%
how is THR on stress test determined with Pt on beta blockers
scale of perceived exertion
how is THR on stress test determined for Pt with heart disease
given an ischemic threshold
prescribed intensity determined by onset of signs and symptoms
functions of stress test (3)
- clearance for strenuous exercise
- determine exercise for Pt recovering of heart surgery
- diagnose latent heart disease
what if Pt is on certain medication before stress test
taken off drugs one or two weeks prior
ST changes
elevation or depression in the ST segment
most important cause of ST segment changes
myocardial ischemia or infarction
causes of ST depression (5)
NSTEMI digoxin right bundle branch block right ventricular hypertrophy secondary changes to infarction
causes of ST elevation (6)
acute MI angina pericarditis left bundle branch block left ventricular hypertrophy secondary changes to infarction
amt of oxygen body uses while resting
3.5 ml O2/min/kg
METs
metabolic equivalent approximate resting energy expenditure
how is a persons heart stressed (3)
treadmill- most common
drugs- for Pts who can’t exercise
bike
drugs used to stress heart (3)
dobutamine
persantine
adenosine
how is Pts heart assessed during stress test (6)
scale of perceived exertion EKG signs and symptoms unanticipated events echocardiogram MUGA scan
3 types of EKGs
graded-exercise stress test with EKG
graded-exercise stress test with stress echocardiogram
thallium stress with EKG and MUGA imagine
if BP reaches ___ then stress test should be stopped
250/150
Borg’s rating of perceived exertion scale
measures perceived exertion
Borg’s dyspnea scale
scale to measure difficulty breathing
average stroke volume
70 ml/beat
does estimated cardiac output over or under estimate
underestimate
ST depression present on EKG without ST elevation
myocardial ischemia/injury
