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Sports-Related Flow Limitations in the Iliac Arteries in Endurance Athletes

Aetiology, Diagnosis, Treatment and Future Developments

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Abstract

Approximately one in five top-level cyclists will develop sports-related flow limitations in the iliac arteries. These flow limitations may be caused by a vascular lumen narrowing due to endofibrotic thickening of the intima and/or by kinking of the vessels. In some athletes, extreme vessel length contributes to this kinking. Endofibrotic thickening is a result of a repetitive vessel damage due to haemodynamic and mechanical stress. Atherosclerotic intimal thickening is seldom encountered in these young athletes. This type of sports-related flow limitation shows no relationship with the classical risk factors for atherosclerosis like smoking, hypercholesterolaemia or family predisposition for arterial diseases.

The patient’s history is paramount for diagnosis. If an athlete reports typical claudication-like complaints in a leg at maximal effort, which disappear quickly at rest, approximately two out of three will have a flow limitation in the iliac artery. In current (sports) medical practice, this diagnosis is often missed, since a vascular cause is not expected in this healthy athletic population. Even if suspected, the routinely available diagnostic tests often appear insufficient. Definite diagnosis can be made by a combination of the patient’s history and special designed tests consisting of a maximal cycle ergometer test with ankle blood pressure measurements and/or an echo-Doppler examination with provocative manoeuvres like hip flexion and exercise.

Conservative treatment consists of diminishing or even completely stopping the provocative sports activity. If conservative treatment is insufficient or deemed unacceptable, surgical treatment might be considered. As surgery needs to be tailored to the underlying lesions, a detailed analysis before surgery is necessary. Standard clinical tests, used for visualising atherosclerotic diseases, are inadequate to identify and quantify the causes of flow limitations. Echo-Doppler examination and magnetic resonance angiography with both flexed and extended hips have been proven to be adequate tools. In particular, overprojection and eccentric location of the lesions seriously limit the usefulness of a two-dimensional technique like digital subtraction angiography.

In the early stages, when kinking has not yet led to intimal thickening or excessive lengthening, simple surgical release of the iliac artery is effective. However, for patients with excessive vessel lengths or extensive endofibrotic thickening, a vascular reconstruction may be necessary. A major drawback of these interventions is that long-term effects and complications are unknown.

As both the diagnostic methods and the treatments for this type of flow limitation differ substantially from routine vascular procedures, these patients should be examined in specialised research centres with appropriate diagnostic tools and medical experience.

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Acknowledgements

The authors are not aware of any conflict of interest that is directly relevant to the contents of this review. No sources of funding were used to assist in the preparation of this review.

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Authors and Affiliations

  1. Department of Surgery, Maxima Medical Centre, Veldhoven, The Netherlands

    Mart H. M. Bender

  2. Department of Sportsmedicine, Maxima Medical Centre, PO Box 7777, 5500 MB, Veldhoven, The Netherlands

    Goof Schep & Adwin R. Hoogeveen

  3. Department of Sports Medicine, University Medical Centre, Utrecht, The Netherlands

    Wouter R. de Vries

  4. Department of Applied Physics, University of Technology, Eindhoven, The Netherlands

    Pieter F. F. Wijn

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  1. Mart H. M. Bender
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Correspondence to Goof Schep.

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Bender, M.H.M., Schep, G., de Vries, W.R. et al. Sports-Related Flow Limitations in the Iliac Arteries in Endurance Athletes. Sports Med 34, 427–442 (2004). https://doi.org/10.2165/00007256-200434070-00002

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