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John Greenwood takes a broad view on pulmonary hypertension and explores the heart-lung interactions that occur in this disease process. Pulmonary hypertension commonly occurs when managing a patient with an acute critical illness. Pulmonary hypertension has a devastating impact on cardiac function. Whilst we recognise the disease itself, we don't recognise the ‘upstream’ effects. John explains how it is these effects that may be causing the patient to crash. John, in this talk, helps you to understand the clinical heart-lung interactions affected by pulmonary hypertension and the effect on the right ventricle. He educates you on identifying patients at high risk for pulmonary hypertension, and finally he discusses critical management strategies for patients with pulmonary hypertension. In the ICU, causes of acute pulmonary hypertension are evident daily.  Microcirculatory of the lung has a strong impact on what the pulmonary pressures are. Therefore, conditions such as pneumonia, ARDS and pulmonary oedema wi