94 The number of particles injected during a perfusion lung scan should be decreased for: （ ）
A: the elderly
B: those with a high risk of pulmonary embolus
C: patients with severe pulmonary hypertension
D: asthmatics
A: the elderly
B: those with a high risk of pulmonary embolus
C: patients with severe pulmonary hypertension
D: asthmatics
举一反三
- Differential cyanosis can be seen in ( ) A: Atrial septal defect with severe pulmonary hypertension B: Ventricular septal defect with severe pulmonary hypertension C: Severe Tetralogy of Fallot D: Severe pulmonary valve stenosis E: Unclosed patent ductus arteriosus with severe pulmonary hypertension
- A special procedure to examine the blood vessels of the lungs by X-ray is called( ). A: thoracocentesis B: pulmonary angiography C: a lung scan D: bronchoscopy
- Which of the following about ventilation/perfusion ratio is wrong? A: normal value in quiet state is 0.84 B: decreasing of ventilation/perfusion ratio means that the alveolar ineffective cavity increases C: ratio in pulmonary bottom is the smallest D: in pulmonary embolism, the ratio increases
- Patients with pulmonary ventilation dysfunction first develop CO2 retention and then hypoxia.
- Pulmonary alveoli are the main part of lung gas exchange and the functional unit of lung.