Does pulmonary venous congestion leads to increased pulmonary artery pressure?
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"Pulmonary Hypertension"[MeSH Terms] AND "left ventricular dysfunction"
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pulmonary venous congestion elevated pulmonary artery pressure pathophysiology left heart disease
Yes. Pulmonary venous congestion can raise pulmonary artery pressure, especially when it is due to elevated left-sided heart filling pressure, such as left ventricular failure or mitral valve disease.
Mechanism:
- Increased left atrial pressure is transmitted backward into pulmonary veins and capillaries.
- This causes pulmonary venous hypertension and congestion, sometimes pulmonary edema.
- The elevated downstream pressure increases pulmonary artery pressure, producing post-capillary pulmonary hypertension.
- If persistent, pulmonary vasoconstriction and vascular remodeling can raise pulmonary vascular resistance too, causing a combined post- and pre-capillary form.
So the usual sequence is:
Left heart pressure elevation -> pulmonary venous congestion -> increased pulmonary venous/capillary pressure -> increased pulmonary artery pressure.
This is distinct from primary pulmonary arterial hypertension, where the main problem is in the pulmonary arterioles rather than backward transmission from the left heart. The medical text notes that lowering pulmonary venous pressure in this setting also lowers pulmonary arterial pressure (Goldman-Cecil Medicine, p. block 9, lines 3661-3670). Current diagnostic descriptions likewise classify left-heart-related post-capillary pulmonary hypertension as mean pulmonary artery pressure >20 mmHg with wedge pressure >15 mmHg, as summarized by the Merck Manual.
What is meant by cephalisation of pulmonary vessels in acute pulmonary edema
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chest radiograph pulmonary venous cephalization upper lobe vascular redistribution heart failure
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"Pulmonary Edema"[MeSH Terms] AND radiography
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cephalization pulmonary vessels chest x ray pulmonary edema definition
Cephalisation means redistribution of pulmonary blood flow toward the upper lobes on an erect chest X-ray.
Normally, because of gravity, lower-lobe vessels are more prominent than upper-lobe vessels. With raised left atrial and pulmonary venous pressure, the upper-lobe pulmonary veins become distended, so the upper-zone vessels look equal to or larger than the lower-zone vessels.
In acute cardiogenic pulmonary edema, it reflects pulmonary venous hypertension from left-sided heart failure. It is an early radiographic sign of congestion, often preceding interstitial edema findings such as Kerley B lines and then alveolar edema.
In short:
Cephalisation = prominent upper-lobe pulmonary vessels due to raised pulmonary venous pressure.
Cephalisation = prominent upper-lobe pulmonary vessels due to raised pulmonary venous pressure.
The term is also called upper-lobe venous diversion. Merck's chest X-ray description describes it as upper-lobe pulmonary vessels becoming more prominent. Harrison’s lists bilateral cephalisation alongside septal and peribronchial thickening as typical of cardiogenic pulmonary edema (Harrison’s Principles of Internal Medicine 22E, block 33, lines 103-106).
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