Anaesthesia Coffee Break Gravitational effects on the lung, Wests Zones and a performance tip for the viva exam!
Oct 10, 2021
Discover how gravity impacts lung function, including ventilation patterns and gas exchange. The discussion reveals the significance of West's Zones in understanding pulmonary blood flow. Hear tips for tackling viva exams, blending self-care with academic strategies. Learn how exercise enhances pulmonary function and the role of proning in optimizing gas exchange, especially in critical care. The hosts break down complex concepts into approachable insights, making it easier to grasp the nuances of respiratory physiology.
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Use The Final Week Strategically
- In the last week before the exam, prioritise self-care and avoid overexposure to vulnerabilities.
- Communicate to practice partners that you want confidence-building questions so you can rehearse success.
Gravity Creates Apex-Baseline Differences
- Gravity makes apical alveoli larger and less compliant at FRC while basal alveoli are smaller but more compliant.
- Blood flow falls more steeply than ventilation from base to apex, so V/Q is higher at the apex.
High Apical PO2 Has Little Global Impact
- Apex has higher PO2 and lower PCO2 and higher pH than the base (example PO2 apex ~132 mmHg, base ~89 mmHg).
- High apical PO2 contributes little to overall oxygen delivery because apical blood flow is low.