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Hypoxic ventilatory response and carotid endarterectomy
R G Vanmaele1, W A De Backer, M J Willemen
1Division of Vascular Surgery, Antwerp University Hospital, Edegem, Belgium.
European Journal of Vascular Surgery
|May 1, 1992
Summary
Carotid endarterectomy did not abolish hypoxic ventilatory responsiveness when carotid bodies were preserved. Atherosclerosis, not surgery, may impair chemoreceptor function.
Area of Science:
- Cardiovascular Surgery
- Respiratory Physiology
- Neuroscience
Background:
- Carotid endarterectomy (CEA) is a surgical procedure to remove plaque from carotid arteries.
- Previous reports suggest CEA abolishes hypoxic ventilatory responsiveness, potentially due to carotid body damage.
- The carotid bodies are crucial chemoreceptors sensing blood oxygen levels.
Purpose of the Study:
- To investigate the effect of CEA on hypoxic ventilatory responsiveness in patients with preserved carotid bodies.
- To assess if CEA impacts chemoreceptor activity as measured by ventilatory response to hypoxia.
Main Methods:
- Studied six patients undergoing bilateral carotid endarterectomy with careful preservation of carotid bodies and innervation.
- Measured hypoxic ventilatory responsiveness (chemoreceptor activity) pre- and post-surgery.
Main Results:
- Five patients had weak or absent hypoxic response pre-surgery.
- Four of these patients showed a significant increase in responsiveness post-CEA.
- No loss of chemoreceptor function was observed in patients with preserved carotid bodies.
Conclusions:
- Bilateral carotid endarterectomy with preserved carotid bodies does not abolish hypoxic ventilatory responsiveness.
- Reduced hypoxic sensitivity pre-surgery may be linked to atherosclerosis impairing carotid body blood supply.
- Further research is needed to confirm the hypothesis on atherosclerosis-induced sensor dysfunction.