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Critical limb-threatening ischaemia and microvascular transformation: clinical implications
Santeri Tarvainen1,2, Galina Wirth1,2, Greta Juusola1,2
1Heart Center, Kuopio University Hospital, Puijonlaaksontie 2, 70210 Kuopio, Finland.
Critical limb-threatening ischaemia (CLTI) involves microvascular changes like capillary enlargement, worsening muscle function and tissue damage. These hypoxia-driven transformations are key to CLTI progression and treatment strategies.
Area of Science:
- Vascular Biology
- Ischaemic Disease Pathophysiology
- Microcirculation Research
Background:
- Clinical management of critical limb-threatening ischaemia (CLTI) primarily targets arterial occlusions.
- The role of microvascular pathology in CLTI progression remains under-specified and unutilized in treatment.
Purpose of the Study:
- To characterize the role of the microvasculature in the pathology of CLTI.
- To explore microvascular alterations and their impact on muscle outcomes in CLTI.
Main Methods:
- High-resolution imaging of CLTI patients (n=50) and muscle samples (n=40).
- Assessment of resting muscle blood flow and microvascular structure.
- Utilized a rabbit model of chronic low arterial pressure ischaemia with VEGF-A gene transfer.
Main Results:
- CLTI muscles showed decreased capillary transit time and capillary enlargement, not depleted blood flow.
- Observed myofibre atrophy, capillary detachment, and arterialization of microvasculature.
- CLTI-like capillary changes worsened muscle force and tissue outcome in rabbits.
Conclusions:
- CLTI involves progressive, hypoxia-driven microvascular transformation impacting blood flow and aggravating tissue damage.
- Hypoxia-driven capillary enlargement is critical for CLTI outcomes and warrants consideration in diagnostics and treatment.
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