Key result
In isolated rabbit abdominal aortas with 50% stenosis, the lowest minimum wall PO2 was 11.6±0.8 kPa at 1 mm downstream, and the fastest O2 disappearance rate was -4.1±0.6 kPa/min at 1 mm upstream.
In a rabbit model of aortic stenosis, oxygen partial pressure and metabolism vary axially, with the lowest PO2 found just downstream of the stenosis and the highest oxygen consumption just upstream.
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Regional PO2 gradients in stenotic vessels remain hypothesis-generating in animal models; human validation required before clinical relevance.
Buerk et al. (2003) studied Aortic stenosis (experimental). Saline perfusion in vitro vs. Different axial locations along the segment was evaluated on Minimum tissue PO2 and O2 disappearance rates (dPO2/dt) axially along the segment. In isolated rabbit abdominal aortas with 50% stenosis, the lowest minimum wall PO2 was 11.6±0.8 kPa at 1 mm downstream, and the fastest O2 disappearance rate was -4.1±0.6 kPa/min at 1 mm upstream.
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