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lab exam 2 > Lab 5- EKG after MI > Flashcards

Lab 5- EKG after MI Flashcards

1
Q

purpose of stress test

A

determine heart rate that challenges the cardiovascular system and does not yet cause signs or symptoms, including EKG changes

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2
Q

APMHR

A

age predicted maximum heart rate

220- age

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3
Q

target heart rate (THR) range

A

70% to 85%

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4
Q

THR for stopping stress test

A

85%

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5
Q

how is THR on stress test determined with Pt on beta blockers

A

scale of perceived exertion

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6
Q

how is THR on stress test determined for Pt with heart disease

A

given an ischemic threshold

prescribed intensity determined by onset of signs and symptoms

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7
Q

functions of stress test (3)

A
  1. clearance for strenuous exercise
  2. determine exercise for Pt recovering of heart surgery
  3. diagnose latent heart disease
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8
Q

what if Pt is on certain medication before stress test

A

taken off drugs one or two weeks prior

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9
Q

ST changes

A

elevation or depression in the ST segment

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10
Q

most important cause of ST segment changes

A

myocardial ischemia or infarction

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11
Q

causes of ST depression (5)

A 
NSTEMI
digoxin
right bundle branch block 
right ventricular hypertrophy
secondary changes to infarction
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12
Q

causes of ST elevation (6)

A 
acute MI
angina
pericarditis
left bundle branch block
left ventricular hypertrophy 
secondary changes to infarction
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13
Q

amt of oxygen body uses while resting

A

3.5 ml O2/min/kg

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14
Q

METs

A

metabolic equivalent approximate resting energy expenditure

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15
Q

how is a persons heart stressed (3)

A

treadmill- most common
drugs- for Pts who can’t exercise
bike

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16
Q

drugs used to stress heart (3)

A

dobutamine
persantine
adenosine

17
Q

how is Pts heart assessed during stress test (6)

A 
scale of perceived exertion
EKG
signs and symptoms
unanticipated events
echocardiogram 
MUGA scan
18
Q

3 types of EKGs

A

graded-exercise stress test with EKG
graded-exercise stress test with stress echocardiogram
thallium stress with EKG and MUGA imagine

19
Q

if BP reaches ___ then stress test should be stopped

A

250/150

20
Q

Borg’s rating of perceived exertion scale

A

measures perceived exertion

21
Q

Borg’s dyspnea scale

A

scale to measure difficulty breathing

22
Q

average stroke volume

A

70 ml/beat

23
Q

does estimated cardiac output over or under estimate

A

underestimate

24
Q

ST depression present on EKG without ST elevation

A

myocardial ischemia/injury

25
Q

ST depression present on EKG along with ST elevation

A

reciprocal changes

26
Q

how often do you measure BP during stress test

A

3 minutes

27
Q

how often do you measure HR during stress test

A

1 minute

28
Q

3 I’s

A

ischemia- ST depression
injury- ST elevation
infarct- Q wave

lab exam 2 (8 decks)

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