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Jornal Vascular Brasileiro

Print version ISSN 1677-5449On-line version ISSN 1677-7301

Abstract

SILVA JUNIOR, João Antônio da et al. Tissue oxygen saturation assessment during claudication symptoms in patients with peripheral arterial disease. J. vasc. bras. [online]. 2015, vol.14, n.4, pp.311-318. ISSN 1677-5449.  http://dx.doi.org/10.1590/1677-5449.002115.

Background

The time at which claudication symptoms are reported is used to modulate exercise intensity in clinical treatment of patients with peripheral arterial disease, but tissue oxygenation values at that point are unknown.

Objective

To describe tissue oxygen supply measured using Near-Infrared Spectroscopy (NIRS) when patients report initial and maximum claudication symptoms during exercise tests.

Methods

Nine patients (eight men) aged 65.63 ± 6.02 years and previously diagnosed with peripheral arterial disease performed constant load exercise testing and incremental load exercise testing while tissue oxygenation levels were monitored by NIRS. Oxygen saturation values at the times at which each patient reported initial onset of claudication symptoms and maximum claudication symptoms were compared with values obtained during the arterial occlusion maneuver, using the 95% confidence interval of the difference.

Results

It was found that saturation values at the time of both initial and maximum claudication symptoms were statistically different from saturation during the arterial occlusion maneuver, but on the basis of percentage analysis they were similar from a clinical point of view.

Conclusions

Oxygen saturations at the time patients report initial and maximum claudication symptoms are very close to saturations during arterial occlusion. From a clinical perspective, subjective patient report of symptoms is an appropriate parameter on which to base exercise prescription.

Keywords : peripheral arterial disease; near-infrared spectroscopy; exercise test; intermittent claudication.

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