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12 ifssh scientific committee on pain syndromes (2012).pdf

IFSSH Scientific Committee on Pain Syndromes
Andrzej Zyluk (Poland)
Report submitted December 2012
Complex regional pain syndrome from hand surgeon perspective:
INTRODUCTION
Complex regional pain syndrome (CRPS, formerly reflex sympathetic dystrophy) is a
descriptive term for a complex of symptoms and signs, including pain at rest or at the
slightest movement, swelling, vasomotor instability (changes of colour, temperature and
sweating) and is accompanied by severe functional impairment of the affected hand or
whole extremity. It is usually caused by trauma or surgery and is characterized by
presence of these symptoms and signs which are more severe than would normally be
expected for the degree of trauma of the precipitating event (which can sometimes be
very minor) and extend beyond the area involved by the initial trauma. CRPS is not
confined to the hand and upper extremity. Involvement of the foot, knee and hip have
been described and generally (although very infrequently) it can occur anywhere in the
body. CRPS in upper extremity most commonly occurs after trauma or surgery, but it
can occur after a stroke, heart disease or spontaneously (Zyluk, 2004).
PATHOPHYSIOLOGY
There is lack of conclusive evidence, demonstrating the pathophysiological mechanisms
leading to development of CRPS. Several theories have been proposed, including
involvement of the sympathetic nervous system, abnormal inflammatory reaction,
sequelae of nerve injury, central sensitization, psychological disturbances and as a result
of inactivity.
The sympathetic theory had attracted wide popularity over several decades in the last
century, followed by coining the former name of the syndrome - reflex sympathetic
dystrophy (RSD). Several treatment modalities have been developed involving
sympathycolysis, such as stellate ganglion block and regional intravenous block with
guanethidine, some of them being very effective (Hannington-Kiff, 1974; Livingstone and
Atkins, 2002). This theory has been eventually questioned, because it did not explain
adequately all clinical aspects of the disease, however, involvement of the sympathetic
nervous system in the chronic stage of the CRPS seems to be justified.
An exaggerated inflammatory response to trauma as an underlying mechanism for
CRPS was postulated as early as in 1942 by Paul Sudeck and this theory has been
constructively developed by Goris and his group (Goris, 1987). The role of toxic free
oxygen and hydroxyl radicals in the development and maintaining an excessive
inflammatory response has been supposed and confirmed (Goris, 1987, Oyen et al.,
1993). An inflammatory process excellently explains all objective clinical findings in the
acute stage of CRPS, such as pain, swelling, redness, increased temperature and
impaired function of the extremity. Several studies showed effectiveness of treatment
utilising free radical scavengers, such as mannitol, corticosteroids, N-acetylcysteine and
dimethys sulfoxide (DMSO), particularly in the acute stage of the condition (Perez et al.,
2001; Perez et al., 2003; Zyluk 2008). Moreover, an inflammatory component does not
preclude a role of the sympathetic nervous system as a factor involved in the whole
spectrum of abnormalities in CRPS, particularly in the chronic stage.
The pathophysiological role for altered central processing has recently attracted
increasing popularity and received support from animal and human investigations. This
theory explains well the peculiar pain phenomena associated with CRPS such as pain
being disproportionate for the degree of trauma of the precipitating event, hyperpathia
and allodynia. The model of neuropathic pain is proposed in which ongoing nociceptive
afferent input form a peripheral focus dynamically maintains altered central processing
that accounts for allodynia, severe pain and other sensory and motor abnormalities
(Gracely et al., 1992). Brain imaging by functional MRI showed changes in brain
function in patients with chronic CRPS, thus giving support for altered central
processing theory.

CLINICAL SUB-TYPES
Classically CRPS is classified into two forms: Type 1 (formerly reflex sympathetic
dystrophy) and type 2 (formerly causalgia). CRPS type 1 comprises a majority of post-
traumatic cases, whereas CRPS type 2 diagnosis requires evidence of nerve damage as a
causative event (some authors suggest the need for objective, electrophysiological
confirmation of nerve involvement). The necessity of distinguishing these two forms has
been recently questioned, since in most cases nerve involvement cannot be definitively
excluded and both forms are clinically identical (Harden, 2010; Oaklander et al., 2006).
Likewise, the traditional, three-staged (acute, dystrophy, atrophy) evolution of CRPS has
been questioned and now two forms are distinguished in the course of the condition:
acute/early and chronic/late, which differ significantly with regard to symptomatology,
treatment requirements and prognosis (Bruehl et al. 2002; Żyluk 1998b). There is no
precise timing of passing from the acute to the chronic form, but it usually occurs within
3-6 months after onset of the condition, with the observation that any therapeutic
intervention may disturb this evolution. There is no definitive single test for confirming
or excluding CRPS and diagnosis relies on clinical examination with the requirement for
a sufficient number of symptoms and signs to be present (Handen et al., 2007; Harden,
2010). In the International Association for Study of the Pain (IASP) set of diagnostic
criteria, four categories of features are established, including sensory, vasomotor,
sudomotor/oedema and motor trophic (Table 1).
Based on our clinical experience, the following clinical sub-types of the condition may be
distinguished, differing significantly with respect to symptomatology, treatment
susceptibility, functional impairment and prognosis. This classification is not necessarily
consistent with that officially existing in the literature, but it is based on our twenty-
years clinical experience of diagnosing and treating more than 200 CRPS patients.
a. Acute (early) CRPS after fractures of the distal radius. This is a very specific and the most common form, characterized by mild to moderate clinical severity, typical symptomatology, relatively easy to treat when diagnosed early and having a good prognosis (Atkins et al., 1990; Goris et al., 2010; Żyluk, 1998a; Żyluk and Puchalski, 2008). It is believed that it can be recognized as early as 2 weeks after fracture, however this may lead to overdiagnosing, because early CRPS and the post-traumatic period display many similarities and may be interpreted in a different manner (Birklein et al., 2001; Field and Atkins, 1997). CRPS after distal radius fractures has a natural tendency to spontaneous resolution within the mid-term perspective (Żyluk, 1998a; Bickerstaff and Kanis, 1994). There is also a spectrum of patients presenting with mild, transient CRPS forms which - although meeting the criteria for diagnosis (i.e. IASP) at 1-2 months after fracture - are only moderately disturbing for patients and may be left untreated or by physiotherapy alone (Dijkstra et al., 2003; Goris et al., 2010; Żyluk, 1998b). After withdrawal of most CRPS symptoms and signs, patients can experience some “residual” complaints as long as one year, or more, after onset of the disease (Field and Atkins, 1997; Zyluk, 2001). CRPS after fractures of the distal radius involves mainly (90%) mid- or older age women, and relatively infrequently (less than 10%) progresses into the chronic stage. b. Acute (early) CRPS after surgery for hand diseases and injuries (carpal tunnel syndrome, Dupuytren’s contracture, trigger digits, hand fractures, tendon and nerve injuries) occurs much less frequently than after fractures of the distal radius (1-2%) and is characterised by similar, typical for early condition symptoms and signs, appearing usually within one month after trauma or surgery. This form is relatively easy to diagnose, because the patients are still under post-operative control. It is necessary to differentiate this form with occult infection spreading through the synovial sheaths of the palm proximally or distally, particularly after mini-invasive surgery. We were faced with such situations and sometimes the differential diagnosis may be difficult. Women are more frequently affected, but the difference is not as big as after fractures of the distal radius. As this form is usually diagnosed early, treatment is effective, the prognosis good and recovery may be expected within a reasonable time. Very infrequently this form progresses into chronic CRPS, unless overlooked or neglected. There is no information about the natural course of this subtype, but it is probably self-limiting, likewise after distal radius fractures. c. Chronic CRPS. As mentioned earlier, it occurs relatively infrequently. If not spontaneously withdrawn, overlooked or misdiagnosed, the acute form passes within 3-4 months into chronic CRPS, presenting with moderate pain in the hand, mild swelling, colder and pale skin, frequently hyperhydrosis, tenderness/hyperpathia but with prevailing finger stiffness, which gives the patients the greatest difficulties, impairs hand function and results in disability. Many of the CRPS symptoms and signs typical for the early stage may disappear, and these changes in the clinical picture may mean that the patient no longer meets the diagnostic criteria of CRPS. Obviously, it does not mean recovery, but evolution of the disease into the chronic stage. Diagnosis of the chronic form is relatively easy, but treatment is more difficult, sometimes challenging and the prognosis towards regaining normal hand function is doubtful. Unlike in acute CRPS, effective treatment is not available and even after stabilization of the disease and
partial withdrawal of most of the features the residual symptoms may be nasty and
functional impairment severe (reduced finger movements and grip strength).
Neurological signs may develop in a proportion of patients, such as hyperpathia,
allodynia, tremor and muscle spasms (Birklein et al., 2000; Verdugo and Ochoa, 2000).
d. Chronic, refractory CRPS. This is the rarest, most severe and peculiar subtype with
the poorest prognosis. It is not distinguished in the literature as a separate form, but -
for practical purposes – it should be (Zyluk, 2006). Typically it develops as a consequence
of trivial injuries (contusions, sprains, superficial wounds, skin infections, small
operations) but rather not after fractures of the distal radius or regular hand surgery.
This form involves exclusively (100%) young women. Recognized treatment modalities
and rehabilitation typically fail in these patients, but specific treatments, directed on the
disease such as “mirror therapy” may be useful. Patients suffering from this form of
CRPS display mild to moderate psychological disturbances and are susceptible to
depression, but it is difficult to distinguish whether it is a cause or a consequence of this
disabling, painful disease (Puchalski and Żyluk, 2005).
DIAGNOSIS
Diagnosing CRPS may be difficult for several reasons: (a) there is great variability in the
presence and severity of specific symptoms and signs; (b) the syndrome comprises a
broad spectrum of clinical forms, i.e. acute, chronic, causalgia, shoulder-hand syndrome
and sympathetically mediated pain. These forms differ with respect to the
symptomatology, treatment modalities and prognosis; and (c) the acute and chronic
forms are very different. Acute CRPS is characterised by pain at rest, swelling, redness,
increased temperature of the hand and reduction of movement because of the pain.
Chronic CRPS is characterised by pain, tenderness, hyperpathia/allodynia, pallor,
reduced temperature, hyperhydrosis and digital stiffness. The diagnosis of CRPS is
based on clinical grounds and the presence of a specified constellation of symptoms and
signs is required to make the decision. The presence of pain is considered obligatory to
the diagnosis. No specific test is known to confirm or exclude CRPS diagnosis and
imaging such as radiography, bone scintigraphy, CT and NMR have limited influence on
decision making (Marshall and Crisp, 2000; Żyluk, 1999). To date no formal,
standardised diagnostic criteria for CRPS have been widely accepted. The International
Association for the Study of Pain (IASP) criteria of diagnosis, both the original (Merskey
and Bogduk, 1994) and the modified forms (Table 1) (Harden et al., 2007; Harden, 2010)
have recently attracted increased popularity and are frequently used in scientific studies
Early diagnosis of CRPS and initiation of treatment appears beneficial, because early CRPS is relatively easy to treat, its prognosis is good and full recovery can be expected within a reasonable time. In contrast chronic CRPS is - in most cases - a disabling condition with a poor prognosis and limited treatment options. As early diagnosis of CRPS is extremely important, a practical protocol has been introduced in author’s institution. The following three conditions are necessary to consider CRPS as the most likely diagnosis: (1) presence of diffuse pain in the hand/extremity, spontaneous or at the slightest (2) functional impairment of the hand or extremity, and
(3) non-existence of any disease that might explain the problem.
Presence of all other symptoms and signs, their number and severity are of secondary
importance, because their occurrence is variable, dependent on many circumstances,
such as predisposing event, stage of the disease, received treatment or physiotherapy.
Therefore, when a patient presents with a painful and functionally impaired hand
following trauma or surgery, CRPS should be considered seriously, after exclusion of all
other possible conditions, such as, e.g. infection, acute arthritis, tendovaginitis, acute
carpal tunnel syndrome or neglect-like syndrome. The presence, absence and intensity of
secondary features, including swelling, vasomotor disturbances, sweating and trophic
changes as well as neurological symptoms are of minor importance, if there is no other
explanation for pain and impairment. No other examinations, such as biochemical tests,
imaging or electrodiagnostics are necessary for establishing the diagnosis which is
purely clinical.
TREATMENT
CRPS is a syndrome of an uncertain prognosis, hence it was reported that a majority of
early forms tend to spontaneous resolution within one year or earlier (Bickerstaff and
Kanis, 1994; Zyluk, 1998a). Progression to the chronic stage is uncommon, but if it
occurs, significantly worsens the prognosis, although does not preclude success of the
treatment (Perez et al., 2003). Treatment of CRPS, when commenced early, results in
recovery in 80-90% of the cases, including relief of the pain and restitution of the
function of the hand. Treatment of chronic forms is much more difficult and usually at
this stage a control of the pain is considered a success, but function of the affected hand
remains poor. The rate of recovery in chronic CRPS is about 20% (Zyluk and Puchalski,
Various treatment methods have been used for CRPS, including those showed in Table 2. The most commonly treatment modalities reported in the literature include sympathetic interruptions, calcitonin and various form of physiotherapy (Bickerstaff and Kanis, 1991; Livingstone and Atkins, 2002). The effectiveness of these treatments is not definitively proven and they are used in different stages of the syndrome. Early forms of CRPS are commonly treated with physiotherapy, calcitonin and free radical scavengers (Bickerstaff and Kanis, 1991; Goris, 1985; Zyluk and Puchalski, 2008). At this stage, one may expect a significant reduction of pain within 1 month and improvement of finger movement after 1-2 months of outpatient treatment. The rate of recovery is reported up to 90%, although, complete restoration of hand function is rarely achieved earlier than after 1 year from the onset of the disease. In the chronic form of the CRPS the treatment is much more difficult and recovery rate does not exceed 20% (Zyluk and Puchalski, 2008). Treatment of CRPS by free radical scavengers has been introduced by Goris (1985). This therapy is based on the assumption that CRPS is caused by an exaggerated inflammatory response to trauma, mediated by an overproduction of toxic oxygen and hydroxyl free radicals (Goris et al., 1987; Oyen et al., 1993). Several substances were used including topical dimethyl sulfoxide (DMSO), mannitol and N-acetylcysteine, all of them having propriety to neutralize toxic free radicals. A combination of mannitol and steroid, dexamethasone in an original method intended for early CRPS, which has been introduced in author’s institution (Zyluk and Puchalski, 2008). ‘SZCZECIN’ TREATMENT PROTOCOL FOR EARLY CRPS
Our institutional treatment protocol for acute CRPS includes administration of 10% mannitol, 250 ml twice a day by intravenous infusion, combined with dexamethasone 8 mg a day, injected intravenously in a bolus. In the course of the treatment, no particular physiotherapy is applied, except encouraging the patients to elevate the hand and to move the fingers in the painless range of motion, both passively and actively. Patients are motivated to profit by analgesic and anti-oedema effect of the drugs to achieve full finger flexion at 1 week. One can call it a psychological feedback done by the medical staff, although it was not conducted according to clearly designed protocol. An important element of this therapy is an in-patient regime. The majority of CRPS patients, even with short lasting disease, were frightened and tired because of experienced progression of complaints and disability after trauma, in spite of improvement. Usually this anxiety was exacerbated by unawareness of the nature of these complaints and ineffective outpatient treatment. An admission to the hospital, explaining why and how the syndrome develops and assurance of the possibility of recovery are important, positive psychological stimuli augmenting the effectiveness of the drug therapy, and motivating the patient to better compliance in reaching the assumed aim of the therapy. Another important element of our protocol is making the diagnosis as early as possible, to prevent progression to the florid, fully-symptomatic form (see above institutional diagnostic criteria for early CRPS). Even the diagnosis of the “incipient” CRPS Type 1 is made in patients who complain of pain, swelling and reduction of finger movement as early as 1-2 weeks after trauma or surgery. These patients are immediately given treatment with our protocol what allowed us to prevent effectively the progression of the disease in many cases. Until now, almost 100 patients suffering from acute CRPS have been treated according to this protocol, with permanent improvement obtained in 95% of them (Zyluk In contrast, we have failed to work out a reliable, effective treatment for chronic CRPS. Attempts have been made with use of regional intravenous steroid blocks, with moderate outcomes, but no permanent functional recovery achieved. Patients having signs of sympathetic hyperactivity and responding positively to intravenous phentolamine (relief of pain, warming of the affected hand) received regional, intravenous sympathetic blocks with good results for several weeks, but not permanently. For chronic CRPS patients we also regularly use an anticonvulsant - gabapentin and an antidepressant - amitrypyline as a supportive therapy, which alleviate pain and is well tolerated by the patients. Some of them had implanted spinal cord stimulators (in neurosurgical department), but its effectiveness is rather modest. Fortunately, patients with chronic condition suffer less from pain, but more from stiffness and partial disability of the hand. They usually adapt well to reduced dexterity of the hand and their functioning in daily living is typically As it was mentioned earlier, the results of treatment of early CRPS are satisfactory, however, resolution of the acute problem does not always restore normal function. Pain related to the weather, reduction of finger flexion and extension, weakness of the hand, cold intolerance and numbness of the fingers can persist over the years and can impair function of the hand and/or be the source of considerable discomfort to the patients. Therefore, the term “recovery from CRPS”, particularly in chronic disease not always means return to normality (Żyluk, 2001) . PREVENTION
There are no specific measures which are known to prevent CRPS after trauma of surgery. It was suggested that careful operative technique, knowledge of anatomy, avoidance of nerve traction and proper postoperative care can reduce of CRPS after operations. It is also a common belief that early mobilization and prompt physiotherapy prevent the development of CRPS after fractures. Therefore, operative treatment of fractures would result in reduction of the risk of CRPS. However, although these factors are (in general) important determinants of the effectiveness of the treatment, their relationship to CRPS has not been scientifically confirmed. Reduction of CRPS incidence has been shown in patients after fracture of the distal radius by a two-months administration of oral vitamin C, but this beneficial effect has not been confirmed by other studies (Zollinger et al., 1998). In patients with a history of CRPS, a new injury or operation to that (or contralateral) extremity is known to increase the risk of a recurrence. Therefore, specific measures are recommended such as avoiding a tourniquet at the operation, pharmacological prevention by mannitol, calcitonin, steroids or vitamin C. However, the necessity of use of these measures has been questioned in some studies, showing that risk of a new episode of the condition in patients who recovered from CRPS is minimal (Zyluk, 2004). In this paper we present some impressions and thoughts about CRPS which we have found useful in our proceedings with CRPS patients. Most hand surgeons, have been, or (sooner or later) will be faced with this problem. We believe that the information presented may support hand surgeons in resolving their diagnostic dilemmas associated with CRPS. REFERENCES
Atkins RM, Duckworth T, Kanis JA. Features of algodystrophy after Colles fracture. J
Bone Joint Surg 1990; 72B: 105-10.
Bickerstaff DR and Kanis JA. The use of nasal calcitonin in the treatment of post-traumatic algodystrophy. Brit J Rheumatol 1991; 30: 291-4. Bickerstaff DR, Kanis JA. Algodystrophy: an under-recognized complication of minor trauma. Brit J Rheumatol 1994; 33: 240-8. Birklein F, Riedl B, Siewke N et al. Neurological findings in complex regional pain syndromes – analysis of 145 cases. Acta Neurol Scand 2000; 101: 262-9. Birklein F, Kunzel W, Siewke N. Despite similarities there are significant differences between acute limb trauma and complex regional pain syndrome I (CRPS I). Pain 2001, 93: 165-71. Bruehl S, Harden RN, Galer B et al. Complex regional pain syndrome: are three distinct subtypes and sequential stages of the syndrome? Pain 2002; 95: 119-24. Field J and Atkins RM. Algodystrophy is an early complication of Colles fracture. What are the implications? J Hand Surg 1997; 22B: 178-82. Field J, Warwick D, Bannister GC. Features of algodystrophy ten years after Colles’ fracture. J Hand Surg 1992,17B: 318-20. Goris RJ, van Dongen LM, Winters HA. Are toxic oxygen radicals involved in the pathogenesis of reflex sympathetic dystrophy? Free Rad Res Comm 1987; 3: 13-18. Goris RJ. Treatment of reflex sympathetic dystrophy with hydroxyl radical scavengers. Unfallchirurg 1985; 88: 330-2. Gracely RH, Lynch SA, Bennet GJ. Painful neuropathy: altered central processing maintained dynamically by peripheral input. Pain 1992; 51: 175-194. Hannington-Kiff JG. Intravenous regional sympathetic block with guanethidine. Lancet 1974; 326: 1019-20. Harden N, Bruehl S, Stanton-Hicks M et al. Proposed new diagnostic criteria for complex regional pain syndrome. Pain Med 2007; 8: 326-31. Harden N. Objectification of the diagnostic criteria for CRPS. Pain Med 2010; 11: 1212-15. Livingstone JA, Atkins RM. Intravenous regional guanethidine blockade in the treatment of post-traumatic complex regional pain syndrome type 1 (algodystrophy) of the hand. J Bone Joint Surg 2002; 84B: 380-386. Marshall AT and Crisp AJ. Reflex sympathetic dystrophy. Rheumatology 2000; 39: 692-5. Merskey H and Bogduk N. Classification of chronic pain: descriptions of chronic pain syndromes and definition of pain terms. 2nd ed. IASP Press. Seattle 1994: 40-43. Oaklander AL., Rismiller JG, Gelman LB et al. Evidence of focal small-fiber axonal degeneration in complex regional pain syndrome-I (reflex sympathetic dystrophy). Pain 2006; 120: 235-43. Oyen WJ, Arnts IE, Claessen RA et al. Reflex sympathetic dystrophy of the hand: an excessive inflammatory response? Pain 1993; 55: 51-157. Perez RS, Kwakkei G, Zuurmond WW, de Lange JJ. Treatment of reflex sympathetic dystrophy (CRPS Type 1): a research synthesis of 21 randomized clinical trials. J Pain Symptom Manag 2001; 21: 511-526. Perez RS, Zuurmond WW, Bezemer PD, et al. The treatment of complex regional pain syndrome type I with free radical scavengers: a randomized controlled study. Pain 2003; 102: 297-307. Puchalski and Zyluk. Complex regional pain syndrome type 1 after fractures of the distal radius: a prospective study of the role of psychological factors. J Hand Surg 2005, 30B: 574-80. Veldman PH, Reynen HM, Arntz IE, et al. Signs and symptoms of reflex sympathetic dystrophy: prospective study of 829 patients. Lancet 1993; 342: 1012-16. Verdugo RJ and Ochoa JL. Abnormal movements in complex regional pain syndrome: asessment of their nature. Muscle Nerve 2000; 23: 198-205. Zollinger PE, Tuinebreier WE, Kreis RW, et al. Effect of vitamin C on frequency of reflex sympathetic dystrophy in wrist fractures: a randomised trial. Lancet 1998; 354: 2025-8. Żyluk A. The natural history of post-traumatic reflex sympathetic dystrophy. J Hand Surg 1998 (a), 23B: 20-23. Zyluk A. Three-staged evolution of post-traumatic algodystrophy. Chir Narz Ruchu Ortop Po. 1998(b); 63: 479-86 (English abstract). Zyluk A. The usefulness of quantitative evaluation of three-phase bone scintigraphy in the diagnosis of post-traumatic reflex sympathetic dystrophy. J Hand Surg 1999; 24B: 16-21. Zyluk A. The sequelae of reflex sympathetic dystrophy. J Hand Surg 2001; 26B: 151-54. Zyluk A. Complex regional pain syndrome type I. Risk factors, prevention and risk of recurrence. J Hand Surg 2004; 29B: 334-7. Żyluk A.Chronic, refractory algodystrophy. Chir Narz Ruchu Ortop Pol 2006; 71: 439-446. (English abstract). Zyluk A and Puchalski P. Treatment of early complex regional pain syndrome type 1 by a combination of mannitol and dexamethasone. J Hand Surg 2008, 33E: 130-6. Table 1. Modified IASP criteria of diagnosis for CRPS
(Harden et al. 2007; Harden, 2010)
Presence of continuing pain, disproportionate to any inciting event
Must report at least one symptom in each of the four categories (*)
Temperature asymmetry and/or skin colour changes and/or skin colour asymmetry Oedema and/or sweating changes and/or sweating asymmetry Decreased range of motion and/or motor dysfunction (weakness, tremor, dystonia) and/or trophic changes (skin, hair, nails) Must display at least one sign at time of evaluation in two or more of the
following categories
Hyperalgesia (to pinprick) and/or allodynia (to light touch, temperature sensation, deep somatic pressure and/or joint movement) Temperature asymmetry (>1OC) and/or skin colour changes and/or skin colour asymmetry Oedema and/or sweating changes and/or sweating asymmetry Decreased range of motion and/or motor dysfunction (weakness, tremor, dystonia) and/or trophic changes (skin, hair, nails) There is no other diagnosis that better explains the symptoms and signs
(*) In each of four categories is a condition for research purposes. For clinical purposes a report of at least one symptom in three of the four categories is enough to meet this Table 2. Methods used in the treatment of CRPS Type 1
Free radical scavengers (mannitol, dimethyl sulfoxide, N-acetylcysteine) Regional intravenous sympathetic blocks (with guanethidine, bretylium, ketanserin) Sympathetic ganglia blocks (i.e. stellate ganglion block) Systemic sympathycolysis (fentolamin, fenoksybenzamine, buflomedil) Epidural administration of analgesics and other drugs (i.e. clonidine, baclofen) Continuous epidural anaesthesia with bupivacaine Continuous brachial plexus blocks with bupivacaine Transdermal, electric nerve stimulation (TENS)

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