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Neuroimmunol Neuroinflammation 2016;3:170-172.10.20517/2347-8659.2015.49© 2016 Neuroimmunology and Neuroinflammation
Open AccessCase Report

Progressive muscle cramps with pain as atypical initial presentations of amyotrophic lateral sclerosis: a case report

Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.

Corresponding Author: Dr. Yan-Jiang Wang, Department of Neurology and Center for Clinical Neuroscience, Daping Hospital, The Third Military Medical University, Chongqing 400042, China. E-mail: yanjiang_wang@tmmu.edu.cn

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    Abstract

    Amyotrophic lateral sclerosis (ALS) is the most common form of motor neuron disease and is a progressive and devastating neurodegenerative disease that affects both lower and upper motor neurons. Muscle cramps, which are characterized by a sudden, painful, involuntary contraction of muscles, are not rare in ALS patients. However, muscle cramps do not normally present early in ALS and therefore not used for the initial diagnosis of ALS. In this paper the authors present a case of ALS with initial manifestation of progressive painful muscle cramps in the absence of muscle weakness. This case might help people to recognize atypical foremost presentations of ALS and therefore formulate effective therapies.

    Introduction

    Amyotrophic lateral sclerosis (ALS) is a rapidly progressive, fatal neurodegenerative disorder.[1,2] The worldwide incidence of ALS is around 1.7-2.3% per 100,000 population per year and the average age of onset is 61.8 and 49.8 for Western countries and China individually. The occurrence rate of men is higher than women.[3-6] The pathogenesis of motor neuron disease (MND) remains largely unclear, genetic factors and various exogenous risk factors are suggested to be associated with MND, including rural residency, alcohol consumption, smoking, toxic substance, glutamate metabolism disorder and aberrant autoimmunity.[4-6]

    Typical clinical presentations of ALS include asymmetric weakness of limbs (60-80%), bulbar symptoms (20%), respiratory muscle weakness (1-3%), generalized weakness in limbs and bulbar muscles (1-9%), axial onset with muscle weakness, muscle atrophy and fasciculations.[7,8] Muscle cramping with pain presents in 7-12% of ALS patients.[9] Muscle cramps, are not rare in ALS patients, but rarely act as initial symptom without muscle weakness of the ALS patients. Some studies reported that muscle cramps could appear during the early phase or prodromal phase of ALS, and muscle cramps could help in the early diagnosis of ALS.[10,11] In this paper we present a rare case with initial manifestation of progressive painful muscle cramps in the absence of obvious muscle weakness.

    Case report

    A 56-year-old Chinese woman presented with progressive limb muscle cramps with pain and walk difficulty for the last 7 months. She had no special medical history before. At the beginning, the muscle cramps started in her left lower limb, 4 months after the onset, muscle cramps were aggravated, and slowly progressed to her right lower limb and left upper limb in turn. Muscle cramps could be induced by touching her skin of limbs and chest. Muscle cramps frequently broke out during sleeping, and could be alleviated slightly by standing. Stiffness and weakness developed in the lower limbs for 4 months after symptom onset. Fasciculations, combined with tight feeling of the hips, was seen in both lower extremities and left upper limb. Then she had difficulty in walking, button-up her clothes and bradykinesia. There was no numbness and muscle atrophy of her tongue, face, hands and limbs. She had no complaints of dysphagia, dysarthria or dyspnea and history of alcohol drinking or cigarette smoking, no family history of neurological diseases.

    Physical examination revealed a normal body figure, well-oriented in place, time and person, with no unconsciousness. Cranial nerve examination revealed no abnormalities. Examination of limbs revealed spastic rigidity in both lower limbs, with 4/5 muscle power in both lower limbs, 4/5 muscle power in left upper limb, and 4/5 to 5/5 muscle power in right upper limb. There was no atrophy of the limbs, trunk and lingual muscles. Sensations and cerebellar examinations were unremarkable. Deep tendon reflexes in the 4 limbs were asymmetrical that left limbs were hyperactive and right limbs brisk. Hoffman’s reflexes and patellar clonus were negative. Left ankle clonus was positive. Babinski’s signs were presented in both sides. For laboratory examinations, blood cell count, urine analyses, liver function, renal function, muscle enzymes (creatine kinase, creatine kinase-MB, aspartate aminotransferase, lactate dehydrogenase, hydroxybutyrate dehydrogenase), serum vitamin B12, autoantibodies and tumor biomarkers were normal. Intracranial pressure and cerebral spinal fluid analysis were normal. Brain and spine magnetic resonance imaging (MRI) suggest Arnold-Chiari malformation type I [Figure 1A], which was not explainable for the symptoms and abnormalities of physical examinations. Spine MRI revealed slight prominence of intervertebral disks and no abnormality was observed in the whole spinal cord [Figure 1A]. Electromyography (EMG) showed neurogenic changes in the left biceps brachii, the left thenar muscles and bilateral gastrocnemius [Figure 1B-D]. Evoked potentials examination showed prolonged latency period in the left side of the visual evoked potential and event-related potential-P300. Motor evoked potential, somatosensoroy evoked potential and brainstem auditory evoked potential, nerve conduction, ambulatory electroencephalogram and electrocardiogram were normal.

    Figure 1. Brain and spine image and electromyography of the ALS case. (A) Brain MRI suggests Arnold-Chiari malformation type I (arrow). Spine MRI reveals slight prominence of intervertebral disks at C4/5, C6/7 and L4/5-L5/S1, and no abnormality was observed in the whole spinal cord. (B-D) Electromyography showed denervation potentials in the left biceps brachii (B), the left thenar muscle (C) and right gastrocnemius (D). ALS: amyotrophic lateral sclerosis; MRI: magnetic resonance imaging

    According to the revised 2,000 criteria,[12] the patient was diagnosed with clinically probable ALS, which was confirmed by other hospitals in Beijing. The oral administration of diazepam and baclofen was initiated; muscle cramps were relieved a bit. The patient did periodic follow-ups in our outpatient clinics, but her symptoms did not improve with the use of the muscle-relaxants prescribed.

    Discussion

    ALS has many varied manifestations as first symptoms, which are vital to help for early diagnosis, and understand the natural course the disease progression.[13] Atypical presentations include cramps and fasciculations in the absence of muscle weakness,[14] frontal-temporal dementia,[15] weight loss[16] and cardiovascular consequences.[17] Clinical characteristics of our case include the progression of muscular painful cramps with upper neurons signs, limb weakness with lower motor neuron signs and electrodiagnostic (EMG/nerve conduction velocity) evidence of denervation. Besides MNDs, other etiology of muscle cramps includes metabolic disorders, electrolyte disturbances, medications, etc.[14] Our patient had no special medical history and laboratory examinations which support the other disease. As to pathophysiology, the muscle cramps may arise from spontaneous discharges of the motor nerves, this may origin at neuronal level and then transferred through the nerve trunks to the muscular fibers or it may begin at nerve trunks level by activation of abnormal cholinergic receptors that function as trigger points.[18] The neurodegeration in ALS might be caused by a complicated interaction of glutamate excitotoxicity, generation of free radicals, superoxide dismutase 1 enzymes, resulting in impaired axonal structure or transport defects.[2,14] A "dying-forward" process is proposed to explain these clinical characteristics.[19]

    Hitherto, there is no disease-modifying therapeutics for ALS. The main managements for patients with ALS are the symptomatic treatments, including muscle relaxants, anticonvulsants for cramps, fasciculations and spasticity, physiotherapy for weakness or disability, and ventilator support for dyspnea,[2,14] These treatments can alleviate symptoms, improve the quality of life and increase the life expectancy.

    In conclusion, our case presents a rare initial manifestation of progressive painful muscle cramps in the absence of muscle weakness. It helps to improve our early recognition of the atypical initial presentations of ALS, and formulate effective symptomatic therapies to improve the life quality and survival of the patients.

    Financial support and sponsorship

    Nil.

    Conflicts of interest

    There are no conflicts of interest.

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    Cite This Article

    Liu CH, Zhu C, Zeng F, Yang H, Wang YJ. Progressive muscle cramps with pain as atypical initial presentations of amyotrophic lateral sclerosis: a case report. Neuroimmunol Neuroinflammation 2016;3:170-172. http://dx.doi.org/10.20517/2347-8659.2015.49

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