Figures
- Figure 1
Anteroposterior chest radiograph of the patient at presentation in the emergency department.
- Figure 2
High-resolution CT chest sections of the patient at presentation in the emergency department. a) Bilateral lung fields show multiple areas of patchy conslidation and ground-glass opacities (left >right) with volume loss on left side. Few areas of fibroatlectatic and fibrobronchiectatic changes also seen in right middle and lower lobes. b) A section at a lower level than in (a) showing similar changes as described earlier in both lung fields.
- Figure 3
West lung zones showing the gravity-dependent blood flow through the lungs.
- Figure 4
Flowchart on the workup of platypnoea and orthodeoxia in our patient. V′/Q′: ventilation/perfusion mismatch; 2D ECHO: two-dimensional echocardiography; CTPA: computerised tomography pulmonary angiogram; HRCT: high-resolution CT scan.
- Figure 5
Chest radiograph posteroanterior view of the patient before discharge.
- Figure 6
Lung ultrasound images of the patient in the a) recumbent and b) sitting position showing an increase in B-profile when sitting.
- Figure 7
A flowchart explaining the mechanism of platypnoea–orthodeoxia in our patient. TB: tuberculosis.
Tables
- Table 1
ABG parameters of the patient in the sitting and recumbent position
Parameters Sitting position, room air# Recumbent position, room air¶ pH 7.477 7.402 PaCO2 23.2 mmHg 23.7 mmHg PaO2 50.5 mmHg 60.6 mmHg SaO2 83.3% 90.2% HCO3− 17.3 mmol·L−1 17.1 mmol·L−1 Alveolar–arterial gradient 70.2 mmHg 59.5 mmHg PaCO2: arterial carbon dioxide tension; SaO2: arterial oxygen saturation; HCO3−: bicarbonate ion concentration; SpO2: oxygen saturation measured by pulse oximeter; FIO2: inspiratory oxygen fraction. #: SpO2 84%, heart rate 113 beats per min, PaO2/FIO2 240; ¶: SpO2 93%, heart rate 79 beats per min, PaO2/FIO2 314.
