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Hypothyroidism with True Myotonia

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Hypothyroidism with True Myotonia J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.41.11.1013 on 1 November 1978. Downloaded from Journal ofNeurology, Neurosurgery, and Psychiatry, 1978, 41, 1013-1015 Short report Hypothyroidism with true myotonia G. S. VENABLES, D. BATES, AND D. A. SHAW From the Department of Neurology, Royal Victoria Infirmary, Newcastle upon Tyne SUMMARY A patient with subclinical hypothyroidism who presented with true myotonia is described. There was no evidence that either he or members of his family had dystrophia myotonica or myotonia congenita. Treatment with thyroxine resolved his symptoms completely. There are two recognised circumstances in which had occasional cramping pains in the forearms myotonia is seen in thyroid disease (Pearce and and legs, and after a hiccough he was aware of the Aziz, 1969). Firstly, clinical pseudomyotonia in- slow relaxation of his abdominal muscles. Direct volving slow contraction and relaxation of the questioning elicited no symptoms of hypo- muscles is seen in severe hypothyroidism and is thyroidism or other disease. There was no family by guest. Protected copyright. one of the features of the Hoffmann syndrome. history of muscle, endocrine, or autoimmune Secondly, hypothyroidism may reveal true myo- disease. tonia in patients who suffer from dystrophia myotonica (Brumlik and Maier, 1972) or myotonia EXAMINATION congenita (Jarcho and Tyler, 1958). Pseudomyo- On examination he was a well-built man without tonia and myotonia are readily distinguishable by evident stigmata of hypothyroidism. He had a electromyography (Waldsterm et al., 1958). Except smooth, non-tender goitre of moderate size with- in the setting of dystrophia myotonica or myotonia out audible bruit. He was in sinus rhythm at 92 congenita, true myotonia has not been recognised beats per minute, and his blood pressure was as a feature of hypothyroidism. We now report a 140/80 mmHg. All his limb muscles were bulky patient with subclinical hypothyroidism (Evered and woody, and there was obvious clinical myo- et al., 1973) who had true myotonia, proven tonia on attempted relaxation of the grip of both electromyographically, and who showed complete hands. However, there was no percussion myotonia resolution after treatment with thyroxine. There or myoedema, and his muscle stretch reflex time was no evidence, either clinically or on electro- was not prolonged. No fasciculation was observed. myography, of myotonia in his family. Muscle power and co-ordination were normal, and sensation was intact in all modalities. Case report LABORATORY INVESTIGATIONS A 42 year old driver presented in March 1976 with Serum creatine kinase was 330 U/l (0-50 U/l), disabling muscle stiffness. During the winter of serum thyroxine 13 nmol/l (60-150 nmol/l), http://jnnp.bmj.com/ 1974-75, while working out of doors on night thyopac-3 136 (92-117), free thyroxine index less shift, he developed episodes of muscle stiffness than 10 (50-160), thyroid stimulating hormone particularly at the beginning of movement. These 25.4 mU/l. Thyroid cytoplasmic and gastric resolved by early spring of that year but recurred parietal cell antibodies were present. Thyroid in January 1976, and progressed to such an ex- tanned red cell antibody titre was greater than tent that by March he was unable to work. He 1/10000 and thyroid microsomal antibody titre complained that he could not initiate walking was 1/1600. Electromyography showed an increase after though several steps his movements became in insertional and spontaneous activity in both the on September 26, 2021 easier. Hand movements, particularly grip, were left deltoid and abductor pollicis brevis muscles. difficult, and he noticed slowness in relaxation. He In the deltoid "bizarre high frequency discharges" (Simpson, 1969), formerly called "pseudomyotonic Address for correspondence and reprint requests: Professor D. Shaw, Department of Neurology, Royal Victoria Infirmary, Newcastle potentials," were recorded. Furthermore, true upon Tyne, NE1 4LP. myotonic discharges were seen clearly (Figure). Accepted 9 June 1978 Muscle biopsy of the right deltoid was normal. 1013 J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.41.11.1013 on 1 November 1978. Downloaded from 1014 G. S. Venables, D. Bates, and D. A. Shaw 2mV loom s L ITFTII' 7- III I--, I, L 11 .ii" i I w i 1-i-L iA JA p rl -1, r I iF I Figure Initial electromyogram to show bizarre high frequency discharge (upper tracing) and true myotonic potential (lower tracing). by guest. Protected copyright. FAMILY STUDIES (Graig and Ross, 1963; Pearce et al., 1964). Pearce The patient had three children all of whom were and Aziz (1969) described fibre hypertrophy, focal clinically normal and had normal serum creatine necrosis, and deposition of mucopolysaccharide kinase, thyroxine, and thyroid stimulating hor- on muscle biopsy. Waldsterm et al. (1958) demon- mone levels. Serum thyroid antibodies were absent, strated "bizarre high frequency discharges" on and electromyography was normal. electromyography in such patients, but subse- quently Wilson and Walton (1959) reported the PROGRESS absence of both the characteristic after-discharge The patient was treated with L-thyroxine but after of myotonia and bizarre insertional discharges dur- one month showed no improvement, and had ing contraction. The constellation of features quite profound stiffness and muscle pain. After a described above, when encountered in athyreotic further four weeks there was a striking improve- cretins, has been named the Debre-Semelaigne- ment. He no longer experienced muscle stiffness Kocher syndrome (Debre and Semelaigne, 1935). or cramps, and had lost 12 kg in weight. At the When encountered in hypothyroid adults it is time his serum creatine kinase was 43 U/I, usually referred to as the Hoffman syndrome, and thyroxine 108 nmol/l, and thyroid stimulating it resolves with replacement therapy. We doubt hormone 5 mU/l. The electromyogram no longer whether this distinction now serves any useful contained myotonic potentials or "bizarre high purpose since the two syndromes are identical. frequency discharges." We emphasise that we are only considering myotonia in association with hypothyroidism. http://jnnp.bmj.com/ Discussion There are other neuromuscular syndromes occur- ring with hypothyroidism, and these have been The syndrome of muscular hypertrophy associated reviewed elsewhere (Wilson and Walton, 1959; with delayed muscle relaxation was first described Astrom et al., 1961; Sahay et al., 1965; Norris and in athyreotic cretins by Kocher (1892), and later Panner, 1966; Pearce and Aziz, 1969; Golding, by Hoffmann (1897) in an adult who had under- 1970; Takamori et al., 1972). The main purpose gone thyroidectomy. Hoffman differentiated the of the present report is to discuss the occurrence impaired relaxation of grip seen in his patient, of true myotonia together with pseudomyotonia on September 26, 2021 now referred to as pseudomyotonia, from true in a patient with Hoffmann's syndrome. To date, myotonia by its failure to improve after several the finding of true myotonia in the presence of contractions. Subsequently percussion myoedema hypothyroidism has been restricted to patients was described in Hoffman type patients (Wilson with dystrophia myotonica or myotonia congenita. and Walton, 1959) and later authors recorded In these patients, unlike those with classical elevation of serum creatine kinase in such patients Hoffmann's syndrome, there is improvement in J Neurol Neurosurg Psychiatry: first published as 10.1136/jnnp.41.11.1013 on 1 November 1978. Downloaded from Hypothyroidism with true myotonia 1015 the ability to relax after several attempts, a Graig, F. A., and Ross, G. (1963). Serum creatine myotonic discharge on electromyography, and phosphokinase in thyroid disease. Metabolism, usually a positive family history. Treatment with Clinical and Experimental, 12, 57-59. L-thyroxine may help to improve symptoms but Hoffmann, J. (1897). (Cited Wilson and Walton, true myotonic potentials persist and herald the 1959). Weitere Beitrag zur Lehre von der Tetanie. Deutsche Zeitschrift fur Nevenheilkunde (Berlin), reappearance of the underlying neuromuscular 9, 278-290. disorder. Jarcho, B. W., and Tyler, F. H. (1958). Myxedema Unlike those cases of dystrophia myotonica pseudomyotonia and myotonia congenita. Archives referred to above, our patient's symptoms resolved of Internal Medicine, 102, 357-366. fully with thyroxine, and his electromyogram re- Kocher, T. (1892). (Cited Norris and Panner, 1966.) turned to normal. The other members of his family Zur Verhutung der Cretinismus und Cretinoider are normal, and we have found no evidence that he Zustande nache neuen Forschungen. Deutsche has dystrophia myotonia or myotonia congenita. Zeitschrift fur Chirurgie (Berlin), 26, 556-626. We, therefore, believe that he demonstrates that Norris, F. H., and Panner, B. J. (1966). Hypothyroid true myotonia can occur solely as a result of myopathy. A rchives of Neurology (Chicago), 14, hypothyroidism. 574-589. Pearce, J. M. S., Pennington, R. J., and Walton, J. N. We would like to thank Professor A. Latner for (1964). Serum enzyme studies in disease. Journal of the biochemical estimations, Dr T. Bird for assay Neurology, Neurosurgery, and Psychiatry, 27, 96- of serum autoantibodies, Dr D. Barwick and Dr 99. Pearce, J. M. S., and Aziz, H. (1969). The neuro- P. Fawcett for the electromyography, Dr P. myopathy of hypothyroidism. Some new observations. by guest. Protected copyright. Hudgson for the
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