Answer Happy

The table below shows data from three patients (1, 2 and 3) who were admitted to a Johannesburg hospital (Patm= 620 mm Hg). Blood samples were obtained and a basic spirometry test was performed for each patient. Patients Normal rangel predicted 1 N 3 values Partial pressure of arterial oxygen (PaO2) (mm Hg) 77 53 59 68-83 Partial pressure of arterial carbon dioxide (PaCO2) 35 36 43 33-37 (mm Hg) Arterio-venous difference in O2 content ((a-v) 02) (mlO2.4-'blood) 22 45 40 30-50 FEV1/FVC 0.85 0.90 0.61 20.7 14 - 20 | 2 22 Respiratory rate (breaths.min-1) Lung compliance (l.mm Hg-1) 12-15 1.90 0.29 2.50 1.80
10 1 point DO TE The hypoxia in patient 1 is most likely caused by decreased ability of the tissues to utilize oxygen. an obstructive lung disease. o . decreased haemoglobin concentration. exposure to high altitude. 11 1 point PE Patient 2's flow volume loop is most likely to show O an increased peak expiratory flow rate. a decreased residual volume. O a a decreased forced vital capacity. an increased total lung capacity.
12 1 point Do PS The partial pressure of oxygen (PaO2) in patient 3 is most likely caused by impaired alveolar gaseous exchange. fibrosis of the lung tissue. decreased ability of the tissues to utilize oxygen. decreased saturation of haemoglobin with oxygen. 13 1 point to PE The respiratory rate of patient 3 is most likely due to the effects of carbon dioxide (CO2) on the central chemoreceptors. hydrogen ions (H) on the carotid chemoreceptors. oxygen (O2) on the central chemoreceptors. bicarbonate ions (HCO3-) on the carotid chemoreceptors.