Lab 8 Flashcards

1
Q

What can be used to measure more sensitive measurements to changes in cardirespiratory function

A

Cardiac and hemodynamic (blood pressure) assessments

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2
Q

What are 4 common measurements for gradex exercise test (GXT) assessments

A

Cardiac-electric condudction through 12-lead ECGs, ratings of percieved exertion (RPE), oxygen consumption, and blood pressure

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3
Q

What percent of Americans have high blood pressure

A

~1/3

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4
Q

Why can high blood pressure have deadly consequences

A

Due to added pressure within vasculature and on organs like the heart, brain, and kidneys

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5
Q

What is pulse pressure

A

The difference between diastolic and systolic pressures (sBP-dBP)

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6
Q

Why do blood pressures rise steadily with age

A

Due to arterial stiffness and plaque buildup

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7
Q

What is the breakdown of blood pressure categories

A

Normal: <120 / <80
Elevated: 120-129 / <80
Hypertension I: 130-139 / 80-89
Hypertension II: 140+ / 90+
Hypertension Crisis: 180+ / 120+

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8
Q

What does MAP determine

A

The rate of blood flow through vasculature

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9
Q

What is the equation for MAP

A

MAP = dBP + 1/3PP
or
MAP = dBP + 1/3 (sBP - dBP)
or
MAP = Q * TPR

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10
Q

Why do MAP calculations lose accuracy during exercise compared to at rest

A

Because the heart is in diastole for about 2/3 of the time during rest, but contracting (in systole) for longer when exercising

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11
Q

Why does blood pressure mainly rise during exercise

A

Due to the increase in cardiac output which increases systolic pressure without really changing diastolic pressure

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12
Q

What effect does aerobic exercise training have on BP

A

It decreases resting and submaximal BP by decreasing HR and vascular tone (TPR)

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13
Q

How does BP change at maximal exercise

A

Diastolic pressure may change while systolic and MAP don’t really change

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14
Q

What are 6 reasons to perform a GXT

A

Evaluate cardiorespiratory fitness in healthy and diseased populations, extend medical history and physical, evaluating exertional discomfort, evaluating presense of hidden coronary artery disease, stratifying risk in pts with known CVD, and prescribing exercise

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15
Q

What are subjects separated into groups based on for GXTs

A

Age, known disease, and risk factors

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16
Q

How does risk factor play into GXT exams

A

Low risk don’t need a medical exam or physician, moderate risk should get a medical exam first, and high risk should have both a medical exam first and have a physician present

17
Q

What is the procedure for GXT exams

A

Risk screening, record resting HR and BP, start test at given work rate, stop at predetermined point, point of volitional exhaustion, or when chest pain or breathlessness occur

18
Q

What are some general signs for stopping a GXT exam

A

1) Onset of angia/angia-like symptoms
2) Drop in sBP >10mmHg despite work load increase
3) Exsessive rise in BP (sBP > 250, dBP >115)
4) Shortness of breath, wheezing, or claudication
5) Signs of poor perfusion (light headed, confused, cyanotic, etc.)
6) Failure of HR to increase with increased intensity
7) Noticeable change in heart rhythm
8) Subject requests to stop
9) Physical or verbal manifestations of severe fatigue
10) Failure of testing equipment

19
Q

When do many cardiovascular or physiological abnormalities present

A

When the body is stressed

20
Q

What does an electrocardiogram (ECG) indicate

A

The hearts ability to function normally under increased myocardial oxygen demand

21
Q

What is the most common sign of myocardial ischemia during a GXT

A

ST segment depression

22
Q

What are the 5 characteristics of a normal/good prognosis during a GXT

A

1) Achieve > 80% predicted HRR
2) SBP increases 5-10 mmHg/MET
3) HR recovery = 12 bpm decrease in HR in 1 min
4) 3-min post-exercise sBP = <90% max sBP
5) Normal cardiac rhythms

23
Q

What are the 5 characteristics of a abnormal/poor prognosis during a GXT

A

1) Achieve < 80% predicted HRR
2) Slow increase or sudden decrease in sBP
3) sBP >250 or increases >140 from rest
4) dBP increases >10 mmHg
5) Dysrhythmias, ST elevations/depressions

24
Q

What speed will subjects use on the treadmill for GXT in lab 8

A

One that ellicits 70% HR max

25
Q

What is the balke treadmill protocall for GXT tests in lab 8

A

1) Start at speed that ilicits 70% HR max
2) Increase treadmill grade 2% every 2 mins (if subject gets to 10%, increase speed by 1mph/2mins)
3) Record HR every min
4) Record BP and RPE every 2nd min
5) 12-lead ECG recorded during the last 10 secs of each stage

26
Q

How does a sBP of 120 compared to 140 change risk

A

Decreases risk of heart attack, heart failure, and stroke by 30% and risk of death by 25%