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15 Cards in this Set
- Front
- Back
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what measurements are involved cardiopulmonary exercise testing?
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O2 uptake VO2
CO2 output VCO2 minute ventilation VE 12 lead ECG blood pressure arterial blood gas pulse oximetry (% Hb sat with O2) |
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what is the relationship between oxygen uptake and work rate relationship?
what is the numerical value of the slope? what is it independent of? what is it dependent on? |
-VO2, VCO2, and VE increases as work rate increases
-the increase in VO2 is linear with increased work rate -delta Vo2/Delta WR is about 8.5 to 11 mL/min/watt and is -independet of sex, age, or height -amount of O2 taken up is determined by any cardiovascular or pulmonary dz. |
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what is the lactate threshold or anaerobic threshold?
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point at which respiration switches to anaerobic
-onset of metabolic acidosis by an increase in lactic acid from hypoxia of the exercising mm. -can be estimated when CO2 uptake takes off away from 02 uptake -the curves of O2 uptake and Co2 output should run together up until AT is reached at which point CO2 takes off |
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how is max hear rate calculates?
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max heart rate=220-age
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what is the heart rate reserve?
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difference bet. age predicted max heart rate and max heart rate achieved
-normally at max exercise there is little or no HRR |
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what is O2 pulse?
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-amount of O2 used by mm/heart beat
-capacity of heart to deliver O2/heart beat |
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what is the blood pressure response?
what is the contraindication to CPET ass. with BP? |
-in working mm there is intense vasovilation
-nonworking mm. are vasoconstricted from increases in sympathetic nerve activity -net result is fall in SVR but systolic BP rises with increases in O2 uptake -if BP falls as exercise intensity increases CPET should be terminated immediately |
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what is ventilation?
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decreased ventilation should not be the reason for decreased stress tolerance
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breathing (ventilatory) reserve
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used to determine if there is a ventilatory limitation to exercise
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what is increases are normal part of exercise physiology?
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VO2 increases
HR increases SV increases CO increases Minute ventilation increases O2 mm extraction increases |
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hoe is a cardiopulomary dz diagnosed using exercise stress testing?
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peak VO2 not reached->low AT=heart dz, PAD, PVD, anemia, chronic metabolic acidosis
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why would you perform CPET?
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-to identify mechanism of exercise limitations
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what sets a CPET apart from a regular cardiac stress test
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standard cardiac exercise stress tests identify ischemic heart dz and cannot define underlying pathophysiology in pts w/ exercise intolerance if nonischemic origin
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what are some absolute contraindications to CPET?
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acute febrile illness
acute EKG changes unstable angina 3rd degree HB uncontrolled CHF suspecting dissecting aneurism DVT/PE myocaditits/pericarditis pul edema uncontrolled HTN uncontrolled asthma Ao stenosis respiratory failure electrolyte imbalance uncontrolled metabolic dz O2 <85 on room temo |
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**what are some indications for CPET?**
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evaluation of unexplained dyspnea
evaluation of exercise intolerance prospective pt for cariac or pulmonary rehab |
