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Unformatted text preview: 9/3/2009 1 Abnormal Responses to Exercise Cardiovascular Diseases 10 fold increase in VO 2 max in sedentary man may only be 6 in cardiac patient (~ 6 METs) Diminished Q due to reduced SV and/or HR Exertional hypotension decreased contractile force of left ventricle Chronotropic impairment disease of SA or AV node SxS (angina, dyspnea, claudication, etc.) Medications may have significant effects on the exercise response Cardiac Disease and Exercise VO 2 = Q X a v O 2 difference Functional Capacity = HR x SV x a v O 2 diff HR = age, beta blockade, sick sinus SV = myocardial damage = contractility, aging Arterial O 2 anemia, smoking, COPD Venous O 2 = deconditioning, aging Coronary artery disease Peak METs = 6 9 SxS = angina, shortness of breath, ECG abnormalities (ST segment depression) Abnormal Responses: CVD (cont) Congestive heart failure Peak METs = 3 6 Poor ventricular function (reduced SV) leading to reduced Q SxS = dyspnea, blunted SBP responses, ECG abnormalities Abnormal Responses: Hypertension Exercise testing strongly recommended for this population. However, may need additional Dxpopulation....
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