Cardiovascular calculations: Peter is wearing a cardiovascular monitoring device
ID: 3476030 • Letter: C
Question
Cardiovascular calculations: Peter is wearing a cardiovascular monitoring device during his rowing competition. He is at the 1000 meter mark (halfway through), and his device is reading the following data: PARAMETER Systolic pressure (aorta) Diastolic pressure (aorta) R-R interval Left ventricular EDV Left ventricular ESV Mean pulmonary artery pressure Right atrial pressure Left atrial pressure O2 consumption (whole body) O2 content of systemic arterial blood O2 content of pulmonary arterial blood VALUE 170 mm Hg 80 mm Hg 470 msec 180 mL 50 mL 21 mmHg 3 mm Hg 6 mmHg 1500 mL/min 0.20 mL O2/mL blood 0.11 mL O2/mL bloodExplanation / Answer
1. TPR is the resistance offered by blood vessels against the ejection of blood from the ventricles. It is dependent on CARDIAC OUTPUT and ARTERIAL PRESSURE.
2. MAP= TPR * CO.
3. From the given data, MAP = 110mmHg ( MAP = 1/3( SBP-DBP)+ DBP and CARDIAC OUTPUT = 16.6L/ min ( O2 consumed / O2 pulmonary vein - O2 pulmonary artery ).
Thus MAP= TPR* CO
Or TPR = MAP/CO
TPR= 110/16.6
TPR= 6.63
4. While watching TV at home TPR would have been comparatively lower as both MAP and CO would have been on the lower side.