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One case of type Ⅱglycogen storage disease with recurrent respiratory failure and left lateral ventricular hemorrhage Type II glycogen storage disease which is called acid maltase deficiency also known as Pompe disease is a kind of multi-organ involved autosomal recessive genetic disease characterized by lysosomal glycogen storage caused by acid maltase deficiency. The clinical manifestations of type II glycogen storage disease are diverse due to different clinical types. We now report one case of type II glycogen storage disease with recurrent respiratory failure and left lateral ventricular hemorrhage then review the relevant literatures in order to improve the understanding of clinicians for this disease. The Patient who was female and 36 years old then was admitted into the department of cardiology, affiliated Zhongda hospital, Southeast University on September 14, 2011 due to the chest tightness, palpitation for more than 5 months and exacerbation for half a month. The patient had the symptoms of chest tightness, palpitations after tiredness more than 5 months ago without chest pain, dizziness, amaurosis or sweating. The symptoms were not cared due to they could be alleviated after break, however, the symptoms recurred after tiredness several times to more than ten times every week. Half a month ago, the patient often felt chest tightness and palpitations aggravated then alleviated in several minutes without any obvious incentive. Cyanosis in lips and nails could be seen in 1 sleep without cough, sputum, fever, chest pain, nausea or vomiting so the patient went into our hospital for the further treatment. The past medical history: no history of bronchial asthma, hypertension, diabetes, hepatitis, tuberculosis or typhoid fever; no history of trauma or blood transfusion; no history of food or drug allergy; no hobbies of smoking or alcohol; no family genetic history; one surgical treatment in department of gynecology of our hospital for ovarian cyst eight years ago(no detail); cesarean section in department of obstetrics of our hospital four years ago. The physical examination at admission:T36.6℃, P120/min, R18/min, BP100/65mmHg, conscious, apathetic, bilateral pupils were equal and round about 4mm in diameter, conjunctival edema, cyanosis of lips, no neck resistance, trachea in the center, no jugular vein distention, no thyroid enlargement; no thoracic deformity, quiet lung breath sound, no moist and dry rales, apex beat 0.5cm inside the left mid-clavicular line at 5th intercostal, no significant expansion of the relative cardiac dullness, heart rate 120 / min, regular rhythm, no pathological murmurs at any auscultatory valve area; flat and soft abdomen, two scars about 5cm and 8cm at lower abdomen, whole abdominal tenderness, rebound tenderness, no significant palpation of enlarged liver and spleen under ribs, no percussion pain in liver and kidney district, bowel sounds normal, no edema in both lower limbs. The laboratory tests: blood RT: normal;D-dimer: 437μg / L; troponin, renal function, electrolytes were all normal; blood gas 2 analysis:pH:7.24, PaCO2: 102mmHg, PaO2: 50mmHg, HCO3-:47.3mmol/L,lactic acid:1.0mmol/L; heart ultrasonography was normal, ECG : sinus tachycardia. Chest CT : a little exudative lesions in lower lobe of left lung,old lesions in upper lobes of bilateral lungs, irregular slight high density shade at vascular gap, heart shadow slightly larger, suspicious limited thickening in pericardium,left pleural thickening ( Figure 1); Arterial blood gas analysis: type II respiratory failure, respiratory acidosis combined with metabolic alkalosis. The patient was transferred to the department of respiratory medicine on September 14, 2011. The physical examination showed low limb myodynamia, upper limbs level 4, lower limbs level 2, limb tendon reflex was not elicited. The laboratory tests: urine, stool, thyroid function, ESR, CRP, IgE, creatine kinase (CK), CK-MB, antinuclear antibodies, anti-Sm antibodies, anti-single-stranded DNA antibody and anti-neutrophil antibodies were all normal; 24-hour urine protein quantitative:0.32g/24h; blood triglycerides: 0.72mmol/L, total cholesterol: 2.47mmol/L, high density lipoprotein cholesterol:0.49mmol/L, low-density lipoprotein cholesterol: 1.42mmol/L; EMG: suspicious myogenic damage. Abdominal B ultrasound: the superoinferior diameter of left lobe in liver was 9.3cm, the anteroposterior diameter was 5.4cm, the oblique diameter of right lobe in liver was 17.2cm, shape regular, envelope smooth, the echo of parenchyma distributed uniformly; the length of spleen was 18.9cm, the splenic 3 thickness was 4.9cm, shape regular, the echo of parenchyma distributed uniformly, no obvious abnormal echo; hepatic vessels were clear, the diameter of portal vein was 1.6cm, no expansion of intrahepatic bile ducts; abdominal B ultrasound showed hepatomegaly, splenomegaly and widened portal vein; Lung function test: FEV1 was 25.8% of the predicted value, FVC was 25% of the predicted value, PEF% was 35.7% of the predicted value, FEV1/FVC ratio: 107.7%, diffusion capacity was normal; polysomnography showed alveolar hypopnea syndrome. The consultation with the neurologists considered the possibility of neuromuscular disease so muscle biopsy and further treatment in neurology was recommended. Due to the financial difficulties, the family members of patient refused and left the hospital voluntarily on September 22, 2011. On November 25, 2011, the patient was admitted into the department of cardiology once again due to chest tightness, palpitations for 7 months and exacerbation with edema in lower limbs for 10 days. The patient felt chest tightness and palpitations which were similar to the last occurring aggravated with paroxysmal nocturnal dyspnea and pitting edema in lower limbs. The physical examination at admission: T36.9℃, P124/min, R22/min, BP120/80mmHg, conscious, listlessness, cyanosis of lips, no neck resistance, quiet lung breath sounds, a little moist rales at bilateral bottom lungs, heart rate 124/min, regular rhythm, myodynamia of upper limbs level 4, myodynamia of lower limbs level 2, muscle tension is 4 normal, moderate pitting edema in bilateral lower limbs. The admission diagnosis: alveolar hypopnea syndrome, type II respiratory failure? chronic heart failure, heart function level Ⅳ. At 7:30 pm, November 25, 2011, the patient manifested confusion and coma with oxygen saturation declining progressively after the meal. The physical examination: BP130/90mmHg, P118/min, SaO2:80%, confusion, cyanosis on lips and cheeks, quiet lung breath sounds, moist rales at bilateral bottom lungs, heart rate 118/min, regular rhythm, moderate pitting edema in bilateral lower limbs. The emergent arterial blood gas analysis: PaCO2:145mmHg, PaO2:46mmHg. The consciousness of patient returned gradually with the oxygen saturation being maintained at 100% through endotracheal intubation and mechanical ventilation. The family of patient refused to transfer the patient to the ICU because of the financial difficulties. At 5:30 am, November 26, 2011, the arterial oxygen saturation of patient dropped to 85%. The physical examination: T:39℃, P120/min, SaO2:85% BP60/30mmHg, blurred mind, quiet lung breath sounds, moist rales at bilateral bottom lungs, heart rate 120/min, regular rhythm, moderate pitting edema in lower limbs. The emergent arterial blood gas analysis:PaCO2:106mmHg,PaO2:58mmHg;blood BNP:68pg/ml;Bedside echocardiography: moderate amount of pericardial effusion. The blood pressure was elevated to 120/90mmHg gradually then the oxygen 5 saturation was maintained at 95% to 100% through the repeated sputum suctioning, dopamine pumping and metaraminol intravenous injection. blood RT: 14.3 × 109/L, N: 89%, CRP: 124mg/L. On November 27, 2011, the body temperature of patient returned to normal after the patient having received the amoxicillin sulbactam sodium and levofloxacin therapy. Reexamination of blood gas analysis: pH7.42, PaCO2:44mmHg, PaO2:75mmHg. On December 2, 2011, tracheotomy was implemented. On December 6, 2011, the consultation with the expert from Nanjing Brain Hospital considered myasthenia gravis and mitochondrial myopathy possible then suggested to detect blood acetylcholine receptor antibodies, thymic tumor antibodies and muscle biopsy (refused by the patient' s family) as well as to give diagnostic treatment of neostigmine. On December 14, 2011, the patient was transferred to the NICU of neurology. The patient said she began to appear weak lower limbs especially in the proximal since teenage after further questioning of her medical history; the physical examination: weakness in the psoas major muscle, flaccid paralysis in the proximal lower limbs, no limb tendon reflexes; the diagnosis of myasthenia gravis was not supported due to the acetylcholine receptor antibody test was negative and neostigmine therapy was ineffective. On December 16, 2011, lumbar puncture: color of cerebrospinal fluid was brown, pressure of cerebrospinal fluid was 6 160mmH2O(normal range:80mmH2O~180mmH2O), cerebrospinal fluid biochemistry: chlorine:113.5mmol/L(normal range:120mmol/L~ 130mmol/L), glucose 5mmol/L (normal range:2.5mmol/L ~ 4.5mmol/L), protein:1200mg/L(normal range:200mg~400mg/L); (normal range:10mg/L ~ 40mg/L); IgG29.4mg/L, routine test: red blood cell count 280 × 106/L ( no red blood cells in normal cerebrospinal fluid ), white blood cell count 10 × 106/L (normal range: 0 ~8 × 106/L); the pathological report of cerebrospinal fluid: increase of red blood cell count, large amounts of phagocytic cells of red blood cells and hemosiderin phagocytic cells were seen (Figure 2), chronic Guillain-Barre syndrome? central nervous system hemorrhage. On December 20, 2011, muscle biopsy: the left vastus lateralis muscle was lean, dark red and not obvious of muscle bundle in the anterolateral incision of left lateral middle femur. Two muscle bundles about 1 × 2 cm size of vastus lateralis were removed out for pathological examination. Head CT on December 21, 2011 showed a small amount of high density shade at the bottom corner of left lateral ventricle with fluid-fluid level (Figure 3) so central nervous system hemorrhage was diagnosed although the patient had no headache, nausea, vomiting and pathological signs. The family members of patient refused to have head MRI and cerebral angiography because of the financial difficulties. Chest CT scan: right pleural effusion, a little inflammation at bilateral lower lungs; enlarged 7 heart shadow, pericardial effusion; limited thickening of bilateral pleura. On December 26, 2011, the pathological report of muscle biopsy showed (Figure 4): large amounts of fibrous fat metaplasia in the striated muscle tissue, muscle fiber atrophy and muscle fiber hypertrophy in part of fibers, extensive vacuolar degeneration of muscle fibers, large amounts of basophilic material in the majority of vacuoles, positive PAS staining deposition of basophilic material which disappeared after salivary amylase digestion in type I and type II fibers were showed through special staining and immunohistochemistry(Figure 5). The clinical pathological diagnosis: type II glycogen storage disease. The patient had fever, elevated hemogram and bilateral lung pneumonia in the chest CT during hospitalization in the NICU. The body temperature of patient gradually returned to normal after she had received the piperacillin tazobactam and other anti-infective drugs. Turning over, patting back and coughing were encouraged then airway management, intermittent ventilator-assisted breathing and respiratory muscles exercise with balloon-assisted ventilation were strengthened for the patient. The patient was relatively stable in the condition and discharged with balloon-assisted ventilation through the incision on trachea to maintain the ventilatory function of respiratory muscles after the above treatment on February 28, 2012. Discussion Glycogen is a highly branched polymer of glucose connected by alpha-1, 4 8 and α-1, 6 glycosidic bonds with the majority of glucose connected by alpha-1, 4 glycosidic bond (93% ) and the branch points connected by α-1, 6 glycosidic bond(7%). Glycogen is mainly stored in cytoplasm and lysosomes as insoluble particles in liver (liver glycogen) and muscle (muscle glycogen) combining with enzymes involved in glycogen metabolism. Glycogen storage disease which had 11 known clinical types in which type II glycogen storage disease is due to acid maltase encoding gene mutation (chromosomal localization at 17q25 .2-q25 .3) with more than 40 kinds of gene mutation patterns up to now can be led to by lysosomal or non-lysosomal glycogen metabolic enzymes deficiency[1]. *Due to acid maltase deficiency, the inhibited glycogenolysis induces glycogen deposition in the lysosomes of muscle fibers to cause lysosomal hyperplasia, destruction and release of abnormal lysosomal enzymes which lead to a series of subcellular structural damage. Type II glycogen storage disease includes three clinical types: infantile, juvenile and adult, among them the latter two are collectively known as late onset type with the incidence rate of about 1/40,000[2]. The main clinical manifestations of infantile onset: low muscle tension, general weakness, feeding difficulties, prominent respiratory muscle weakness, macroglossia, hepatomegaly and cardiac hypertrophy within 1.6 to 2.0 months after birth. The majority of this type usually die within 2 years with the average life expectancy for about 6.0 to 8.7 months due to the 9 rapid progression of disease. This type involves spinal cord, brain stem and cerebral cortex with the clinical manifestation of malignant hyperthermia. The main clinical manifestations of juvenile onset: motor developmental delay, progressive limb-girdle muscle weakness, respiratory related muscle weakness, respiratory failure and gastrocnemius hypertrophy before 10 years old. This type usually die at 20 to 30 years old due to respiratory failure with slow progression. The main clinical manifestations of adult onset: slowly progressive proximal muscular weakness mainly involving pelvic girdle muscles, limb girdle muscular dystrophy or polymyositis, lowered or no tendon reflexes, scapular and peroneal muscular weakness, face tongue muscular weakness, asymmetric muscular weakness, macroglossia (8% ~ 10%), involvement of respiratory muscles at age of 30 to 40 years old. The involved skeletal muscles of late onset type are mainly in limb-girdle muscles, para-spinal muscles and proximal limbs usually more in lower limbs than in upper limbs and rare in brain dominating muscles[3]. Late onset type often have some slight muscle involvement symptoms at the early age[4] consistent with the manifestation of this patient. The serum CK of three clinical types all can be elevated especially in the infantile type (up to 10 times of normal). EMG mainly shows myogenic damage as well as neurogenic changes such as myotonic discharge and fibrillation potentials[5].The severity degree of the disease depends on the residual acid α-glucosidase 10 enzyme activity determined by the gene mutation. Enzyme activity of the infantile is completely absent or remnant of 1% less than normal while the residual enzyme activity of late onset type is usually not more than 30% of normal. The one whose enzyme activity is more than 40% of normal will not have onset[2]. The diagnosis of this disease is mainly based on histochemical staining, electron microscopy examination and gene mutation analysis of muscle biopsy. Muscle histopathology: typical basophilic vacuole in which periodic acid Schiff staining and acid phosphatase staining are positive in a large amount of muscle fibers especially the type II fiber can be seen through light microscope. Glycogen lake among myofibril and a lot of autophagy vacuoles can be seen through electron microscope. Disease-causing mutation in genetic testing is not essential for the diagnosis of Pompe disease but mainly for family screening and genetic counseling. The main differential diagnosis: muscular dystrophy, polymyositis, spinal muscular atrophy, acute Guillain-Barre syndrome and other metabolic myopathies such as lipid metabolism disorders myopathy and mitochondrial myopathy. The support of cardiopulmonary function, rehabilitation training, low sugar high protein or branched chain amino acid diet in clinic at present can not prevent the progression of this disease due to the disease lacks of specific treatment. In recent years, enzyme replacement therapy (ERT) 11 such as recombinant human acid α-glucosidase enzyme (rhGAA) can obviously improve cardiac and skeletal muscle function of patients with infantile type so as to significantly extend their life in clinical trials bringing new hope for Pompe patients[6], however, the treatment of this enzyme is ineffective for glycogen deposition in central nervous system due to it can not pass blood-brain barrier[7]. GAA transgenic therapy shows its potential application prospect[8-10]. The head CT scan of the patient on December 21, 2011 showing the left lateral ventricular hemorrhage is considered to result from the disease involving the cerebral vessels. The literatures show: there were several case reports of late onset Pompe disease with cerebrovascular lesions [11] such as basilar artery aneurysm and expansionary artery disease with the common clinical manifestations of cerebral hemorrhage, subarachnoid hemorrhage or cerebral infarction, transient ischemic attack, cerebral edema and hydrocephalus. Pathological study of the stroke patients died of this disease found there was significant vacuolar degeneration caused by glycogen storage in the smooth muscle cells of cerebral vascular walls[12]. The lumbar puncture report of the patient on December 16, 2011 showing the cerebrospinal fluid protein concentration was significantly increased and the majority of the cells was red blood cells while white blood cells were slightly increased is considered to result from the intraventricular hemorrhage rather than Guillain-Barre syndrome. Why the 12 patient did not have headache or other positive pathological signs may be associated with the less bleeding volume. In conclusion, type II glycogen storage disease has certain characteristics but lacks of specificity and notably involves respiratory muscles and trunk muscles similar to polymyositis and muscular dystrophy in the clinical. The disease is often suspected when serum muscle enzymes are elevated or even normal and definitely diagnosed with muscle pathological examination. Head CT, MRI, cerebral angiography and cerebrospinal fluid examination are helpful for the diagnosis of type II glycogen storage disease with cerebrovascular lesions. 13 Reference [1] Martiniuk F,Mehler M,Tzall S,et al. Sequence of the cDNA and 5'-flanking region for human acid alpha-glucosidase, detection of an intron in the 5' untranslated leader sequence, definition of 18-bp polymorphisms, and differences with previous cDNA and amino acid sequences. DNA Cell Biol,1990,9(2):85-94. [2] van der Ploeg AT,Reuser AJ. Pompe's disease. Lancet,2008,11;372(9646):1342-1353. [3] Barnes D,Hughes RA,Spencer GT,et al. Adult-onset acid maltase deficiency with prominent bulbar involvement and ptosis.J R Soc Med,1993,86(1):50. [4] Laforêt P,Nicolino M,Eymard PB,et al. Juvenile and adult-onset acid maltase deficiency in France: genotype-phenotype correlation. Neurology,2000,55(8):1122-1128. [5] Katzin LW,Amato AA.Pompe disease: a review of the current diagnosis and treatment recommendations in the era of enzyme replacement therapy. J Clin Neuromuscul Dis,2008,9(4):421-431. [6] Schoser B,Hill V,Raben N,et al. Therapeutic approaches in glycogen storage disease type II/Pompe Disease. Neurotherapeutics,2008,5(4):569-578. [7] Lacaná E,Yao LP,Pariser AR,et al. The role of immune tolerance induction in restoration of the efficacy of ERT in Pompe disease. Am J Med Genet C Semin Med Genet,2012,160(1):30-39. [8] Bali DS,Goldstein JL,Banugaria S,et al.Predicting cross-reactive immunological material (CRIM) status in Pompe disease using GAAmutations: lessons learned from 10 years of clinical laboratory testing experience.Am J Med Genet C Semin Med Genet,2012,160(1):40-49. [9] Messinger YH,Mendelsohn NJ,Rhead W,et al.Successful immune tolerance induction to enzyme replacement therapy in CRIM-negative infantile Pompe disease. Genet Med,2012,14(1):135-142. 14 [10] Muraoka T,Murao K,Imachi H,et al.Novel mutations in the gene encoding acid α-1,4-glucosidase in a patient with late-onset glycogen storage disease type II (Pompe disease) with impaired intelligence. Intern Med,2011;50(24):2987-2991. [11] Laforêt P,Petiot P,Nicolino M,et al. Dilative arteriopathy and basilar artery dolichoectasia complicating late-onset Pompe disease. Neurology,2008,70(22):2063-2066. [12] Scriver CR, Beaudet AL, Sly WS, et a1.The metabolic and molecular basic of inherited disease.New York:McGraw-Hill,2001:1521-1551. 15 Fig 1 Fig 2 16 Fig 3 Fig 4 17 Fig 5 18