CECS is a condition in which increased pressure within a closed anatomical space (Intra-compartment Pressure ICP), compromises the circulation and the function of the tissues within that space. There are 4 compartments in the leg (Fig.1.0.), 4 compartments in the arm and 9 compartments in the foot. CECS of the legs is more common.
Figure.1. Cross sectional anatomy (from left – right): leg, foot and forearm.
Clinical picture: The patient typically presents with pain and tightness on exercise, which is only relieved by variable period of rest, usually few minutes. When pain occurs they have to stop. They can usually differentiate between symptom of tightness and cramp. In some cases they may experience reversible transient paraesthesia and numbness. It is usually bilateral and commonly affects the anterior compartment but can occur in the deep posterior compartment. Superficial posterior and peroneal compartments are very rarely affected. There are however, large variation when the foot and forearm are involved.
Pathophysiology: It is postulated that increase in ICP in CECS may occur for 3 main reasons:
(1) Stiff fascia,
(2) Large muscle or,
(3) Small compartment.
Qvarfordt et al (1983) and Styf et al (1987) measured intramuscular pressure and muscle blood flow during exercise. They summarised that the intramuscular pressure was significantly increased at rest and during and after exercise as compared with normal subjects. Biopsies of the anterior tibial muscles showed increased water content, which may explain the elevated pressures. Muscle blood flow during exercise as measured by the xenon-133 clearance technique was decreased, and muscle lactate concentration was increased in the anterior tibial muscles. Fasciotomy relieved pain and normalised intramuscular pressure, muscle blood flow, and skeletal muscle metabolism.
Investigation: Gold standard investigation is dynamic intra-compartment pressure (DICP) test which should generate information on maximum, mean, relaxation and resting pressure, together with a pressure tracing for on the spot interpretation and evaluation.
Treatment: Surgery – Superficial fasciotomy or fasciectomy. Choosing the right surgeon is vital. Keep away from surgeon who operated in the middle 2 legs below.
DYNAMIC INTRA-COMPARTMENT PRESSURE MEASUREMENT (DICPM) FOR CHRONIC EXERTIONAL COMPARTMENT SYNDROME (CECS)
Currently there are 2 main methods of assessing intra-compartment pressure (ICP) in a muscle compartment:
short and not entirely suitable for observation of ICP change during exercise.
There has been criticism of this method1 and further blog in Clinical Journal of Sports Medicinel2 (http://cjsmblog.com/category/general-interest/page/2/
This system allows for monitoring of pressure in multiple compartments (maximum 4) at the same time and with long leads, allows patient to jog on the spot (Fig.4.) for 60 seconds (maximum, mean and relaxation pressures) with 30 seconds rest (Fig.5.) (resting pressure). The system is versatile enough to allow exercise in the activity (Fig.6A&B.) that brings on the symptoms. This is critical as ICP increase is often exercise specific3. The tracing is crucial as it allows assessment of the catheter, whether it is blocked, kinked, not in the compartment or, has slipped and sitting under the skin. It also allows for the assessment of 4 separate variables of ICP i.e. maximum pressure, mean pressure, relaxation pressure and the resting pressure.
Unfortunately at the moment other systems that are widely used do not give this comprehensive information and relies very much on display of mean pressure in digital format. The DICPM investigation takes around 1 hour to perform.
Systematic Review and Recommendations for Intracompartmental Pressure Monitoring in Diagnosing Chronic Exertional Compartment Syndrome of the Leg. Clin J Sport Med 22(4): 356-370.
Chronic exertional compartment syndrome – the case for the trace. Guest blog by Drs Nat Padhiar & Osama Aweid
July 17, 2012
In our view, looking at intra-compartment pressure for the diagnosis of chronic exertional compartment syndrome (CECS) without visualising a pressure tracing is like trying to interpret an ECG without the ECG tracing. How do you know what is wrong with the cardiac muscle? We are not for one minute suggesting that the two conditions are the same, but would like to put forward an argument for intra-compartmental pressure (ICP) testing using a pressure tracing as a very useful and more objective tool in making a diagnosis of CECS.
A pressure tracing can provide the following data which can be very useful.
(1) It allows an opportunity to check whether the catheter is in the right compartment and that the catheter is patent by squeezing the compartment that is being investigated (Fig.7.)
(2) One can measure maximum, mean, relaxation and resting pressures (Fig.8.)
(3) It can detect blockage at tip of the catheter, from wave form changes.
(4) It can detect whether the catheter has slipped and sitting under the skin, from wave form changes.
(5) It can detect whether it is part or fully in the blood vessel, from wave form changes.
(6) In some patients, the increase in ICP is exercise specific. ICP with tracing allows for comparison between different exercises at the time of testing. (Fig.9.)
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