Pediatric Anesthesia ISSN 1155-5645 REVIEW ARTICLE McArdle’s disease (glycogen storage disease type V) and anesthesia – a case report and review of the literature Georg Bollig1,2 1 Department of Anesthesiology and Intensive Care, Palliative Medicine and Pain Therapy, HELIOS Klinikum Schleswig, Schleswig, Germany 2 Department of Surgical Sciences, Haukeland University Hospital, University of Bergen, Bergen, Norway Keywords general anesthesia; glycogen storage disease; glycogen storage disease type V; malignant hyperthermia; McArdles disease; perioperative complications Correspondence Georg Bollig, Department of Anesthesiology and Intensive Care, Palliative Medicine and Pain Therapy, HELIOS Klinikum Schleswig, Schleswig, Germany Email: [email protected] Summary McArdles disease (glycogen storage disease type v) is a rare condition in which energy-metabolism in the muscle is hampered. A case report is presented and the possible risk for perioperative complications including malignant hyperthermia is discussed. A checklist for the anesthesiological management of patients with McArdles disease is provided. A short overview of anesthesiological challenges and perioperative complications of other glycogen storage diseases is given. Section Editor: Barbara Brandom Accepted 3 March 2013 doi:10.1111/pan.12164 Introduction McArdle’s disease is a rare condition in which energy metabolism in the muscle is hampered. A case report will be presented, and the possible risk of perioperative problems including malignant hyperthermia is discussed. In addition, a brief overview of anesthesiological challenges and implications of glycogen storage diseases will be given. Case report A previously healthy young man aged 21 was scheduled for a septoplasty in general anesthesia in an ear, nose, and throat department of a German university hospital. The medical history included three operations with general anesthesia without any complications despite from nausea and vomiting. The patient has always been healthy but was known to be a bad sportsman. Consultations of a pediatrician and orthopedician because of bad condition and knee pain under exercise in early childhood came to the conclusion that the boy had poor condition and patella problems and that he needed more physical training. During the surgery, an episode with © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 tachycardia and hypotonia occurred. After the operation, the anesthesiologist informed the patient about the event and the fact that he had elevated liver enzymes (aspartate transaminase = AST, alanine transaminase = ALT, and lactate dehydrogenase = LDH). An overview of the patient’s anesthesiological history is given in Table 1. Laboratory tests for hepatitis and HIV had been undertaken without previous informed consent by the patient and were negative. No diagnosis was made, and the patient got the advice to take a control blood sample in a few months at the patient’s general practitioner. Control tests of the liver enzymes half a year later at the patient’s general practitioner showed an elevation of the liver enzymes. One year later, a control was undertaken and elevated liver enzymes were again reported. Therefore, the patient was admitted to a medical hospital ward and a liver biopsy was performed. The result of the liver biopsy was normal, and the patient received the diagnosis ‘unclear liver enzyme elevation’. Three years after the operation, a new control blood sample was taken with a broader range of laboratory tests on request of the patient who was concerned about his health status and started to worry about having an unknown and probably serious medical condition. The 817 McArdle’s disease and anesthesia G. Bollig Table 1 Overview of F.M.’s anesthesias Age at surgery Type of surgery Type of anesthesia Anesthetic agents and neuromuscular blockers used 5 13 Otoplasty Otoplasty General anesthesia General anesthesia Halothane? Unknown 19 21 Tonsillectomy Septoplasty General anesthesia General anesthesia 25 33 Muscle biopsy arm Osteochondroma left hand + bone graft 36 Muscle biopsy leg General anesthesia Spinal anesthesia + regional anesthesia (ax. Plexusan.) Regional anesthesia 38 Septoplasty Local anesthesia Problems Comments Inhalation induction postoperative nausea and vomiting Alfentanil, brevimytal, nitrous oxide Thiopentone, fentanyl, succinyl, alfentanil, isoflurane, halothane Local anesthesia Local anesthesia No problems No intraoperative problems No problems Tachycardia + hypotonia No problems No problems Local anesthesia No problems Local anesthesia No problems Use of tourniquet (upper arm) without problems In vitro contracture test (IVCT) result: malignant hyperthermia susceptible (MHS) Patients wish to use LA instead of general anesthesia as recommended by the surgeon patient F.M., born 1967, 183 cm, 80 kg; modified from (1) Heartrate/min Bloodpressure (mmHg) 0 30 70 110 76 116 164 204 120/85 130/170/180/- Lactate (mM) 0.8 0.8 1 0.8 Heart rate/min Workload (watt) Lactate (mM) Workload (watt) Workload (watt) blood sample showed elevated liver enzymes again and an elevated creatine kinase level >5000 U/l. This led to referral to a neurologist, a muscle biopsy, and exercise testing of the patient. Apart from poor condition and 818 Figure 1 Cycle ergometry of the patient F.M. (modified from (1)). knee pain under exercise, the medical history and clinical examination were normal. The patient had been working as paramedic and had observed that he was not as strong as his colleagues and that he sometimes © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 G. Bollig experienced muscle cramps in the arms and hands after carrying patients. A cycle exercise test revealed a high heart rate in relation to the workload and a lacking rise of lactate under exercise (Figure 1). In combination with a muscle biopsy and test for myophosphorylase activity in the muscle sample, the diagnosis of McArdle’s disease was confirmed. Later, a genetic test was performed. The patient was found to have the two mutations R50X (previously named R49X) and a previously unknown splice site mutation IVS10 (+1G-A) (1). Interestingly, in the case of this patient, a cycle ergometry with lactate testing has been used instead of the classic ischemic forearm test (1). Cycle ergometry is a safer test option for patients with McAd than the classic forearm test, which according to McArdle can lead to massive rhabdomyolysis and bears a risk of acute renal failure. There was no positive family history for McArdle’s disease in the patient’s family. The whole family (parents and three older sisters) was tested using cycle ergometry. One sister was diagnosed to have McAd and the patients’ father showed clinical symptoms of McAd but had a lactate elevation under exercise. Clinically this looked like a dominant transmission, but autosomal recessive transmission could be proved by genetic analysis later (1). At the age of 36 a muscle biopsy was taken in regional anesthesia and the result of an IVCT was that the patient was malignant hyperthermia susceptible (MHS). McArdle’s disease McArdle‘s disease (McAd) was named after Brian McArdle who first described the syndrome in 1951. It is also known as glycogen storage disease type V, myophosphorylase insufficiency, or myophosphorylase B deficiency. Muscle pain, early fatigue, and especially knee pain under exercise are the typical clinical signs of McAd. Usually, the pain disappears after resting for some minutes. Others signs are exercise intolerance during sport or physical activity, premature fatigue, myalgia, stiffness, cramps, and myoglobinuria (2,3). The cause of McAd is the lack of myophosphorylase (alpha-1,4-glucan orthophosphate glycosyl transferase). Glycogen breakdown in the muscle is usually initiated by the enzyme myophosphorylase, which removes 1,4glycosyl groups from the glycogen molecule with release of glucose-1-phosphate. Most patients with McArdle’s disease have no detectable myophosphorylase activity. McAd is an autosomal recessive disease although transmission appears to be autosomal dominant in some families (2–4). A positive family history can be found in 50% of the patients. The gene for myophosphorylase has been assigned to chromosome 11q13, and the most common mutation in Caucasians is R50X (5). © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 McArdle’s disease and anesthesia Just 4% of the cases are diagnosed before the age of ten, most patients (50%) are diagnosed between the age of 10 and 30 (2). The true incidence of McAd is unknown due to the benign character of the disease and the often late or missed diagnosis. The prevalence in the Dallas–Fort Worth area has been estimated to be 1 in 100 000 (6). Interestingly, the metabolic situation of patients with McAd is similar to the situation of marathon runners after depletion of glycogen depots. Therefore, McArdle’s disease has been called a ‘nature-experiment’ (1). The prognosis of McAd is good in general, although muscle wasting and weakness in late life have been described. There are some case reports with generalized weakness right after birth and death in childhood. Life expectancy in relation to cardiocirculatory diseases is normal (1). It is important for the patients to learn how to cope with the disease and how to avoid major muscle damage, which can lead to acute rhabdomyolysis and renal failure. The diagnosis of McAd is based on the clinical picture and description of the patient, the absence of increased lactate during the forearm ischemic exercise test or cycle ergometry, a low or absent myophosphorylase activity on histochemical or biochemical examination of a muscle biopsy and genetic testing (1–4,7). The most important laboratory investigation is creatine kinase, and hypercreatine kinase-emia can be the only sign of McArdle’s disease in childhood (8). The differential diagnosis includes metabolic myopathies such as mitochondrial myopathy, glycogen storage myopathy, and impaired fatty acid and organic acid metabolism; endocrine myopathies such as thyroid myopathy; preclinical stage or carrier for muscular dystrophy; congenital myopathies; inflammatory myopathies; and MH (9). No specific treatment for the enzyme deficiency of patients with McAd has been found yet. Different treatment options have been shown to reduce symptoms or to enhance the ability for physical activity in patients with McAd. These are, for example, a low-dose oral creatine (10) and ingestion of oral sucrose immediately prior to exercise (11). In some case reports, a possible benefit of the beta-2-sympathomimetics isoproterenol and clenbuterol has been described (1,12). Other treatment options described in the literature are supplementation with vitamin B6 and coenzyme Q 10 (1). Moderate physical activity with aerobic conditioning is recommended by several authors (1,13,14). It has been shown that mostly aerobic activity does not lead to an increase in the creatine kinase level. Instead, moderate cycling or hiking led to a decrease in the creatine kinase in one case report (1). 819 McArdle’s disease and anesthesia Anesthesiological challenges and clinical problems in McArdle’s disease In general, patients with McAd have the potential of perioperative complications, such as hypoglycemia, rhabdomyolysis, myoglobinuria, acute renal failure, postoperative fatigue, and possibly malignant hyperthermia. Rhabdomyolysis, myoglobinuria, and acute renal failure Rhabdomyolysis, myoglobinuria, and acute renal failure have been described in McAd. Myoglobinuria occurs in 50% of the patients with McArdle’s disease, and in 27%, acute renal failure has been described following rhabdomyolysis after episodes of strenuous or vigorous exercise (2). Some case reports of acute renal failure as complication of McAd can be found in the literature. Massive rhabdomyolysis and myoglobinuria have been described after a diagnostic ischemic work test using a tourniquet (15). Acute renal failure has been reported after carrying a TV (16), after a swimming competition (17), and after an asthmatic attack (18). One patient died after multiple epileptic seizures and acute renal failure (19). McArdle’s disease and malignant hyperthermia Some neuromuscular diseases probably have a higher risk of developing malignant hyperthermia (MH) when anesthetized with known triggering substances (20). The in vitro contracture test (IVCT) for MH has been recommended to examine all patients with exercise-induced rhabdomyolysis in addition to a muscle biopsy to establish a histological/histochemical diagnosis (21). There is strong evidence for an association of MH with some diseases as central core and multiminicore myopathies, King–Denborough syndrome, and Brody myopathy (22). An overview over different ‘unusual’ diseases and the risk of MH has been given by Davis and Brandom (23). For most neuromuscular diseases including McAd, an association with MH could not be verified, and to our current knowledge, there is only a weak evidence for an association of McAd with MH (23). In a review and retrospective study of eight McArdle patients with 23 general anesthesias, two of the three patients tested had a positive IVCT and should according to the general definition be classified as MH susceptible (MHS). Only one of these patients who received succinylcholine, a ‘possible reaction to isoflurane’, was suspected. However, the patient did not suffer from a fulminant reaction, the condition was 820 G. Bollig normalized after general treatment of hypotension and did not reoccur when halothane was used instead of isoflurane after normalization of the blood pressure (24). It was concluded that it was unlikely that this episode was an atypical form of MH. The case of this patient and his medical history is described in detail above. There are two existing case reports that discuss a possible connection of McAd and MH (25,26). In one case, the family of a 6-year-old boy with McAd had a family history of MH (25). The other case report was a noncardiogenic pulmonary edema and rhabdomyolysis reported after protamine administration in a 2-year-old boy with McAd operated for Fallot’s tetralogy (26). MH was suspected intraoperatively because of rhabdomyolysis during general anesthesia with halothane. This assumption could not be confirmed, as there was no muscle rigidity or rise in PaCO2 or body temperature. So far, no conclusive evidence has shown a relation of McAd with MH. It has been stated that the in vitro contracture test is less specific in patients with concomitant myopathies (27). Probably, the muscles of patients with McAd are more susceptible to muscle cramps and that this is a nonspecific reaction. It could be the case that these ‘MH-like reactions’ are based on pathophysiological mechanisms similar to but still different from MH (27). Probably, patients with McArdle’s disease are more susceptible to skeletal muscle injury in situations when energy sources are scarce or a very high energy demand occurs. Probably, a positive IVCT test result in McArdle’s disease could just be a reaction of a muscle running out of fuel. Muscle cramps or rhabdomyolysis and myoglobinuria do occur in patients with McArdle’s disease as reaction to different causes and have a risk of developing renal failure due to rhabdomyolysis. Therefore, muscle ischemia as, for example, caused by tourniquets should be avoided and shivering prevented (24). Anesthesiological challenges and clinical problems in other glycogen storage diseases Information on McArdle’s disease and the other glycogen storage diseases can easily be obtained from the Internet (http://mcardlesdisease.org, download 26.10.2012, http:// www.agsd.org.uk/Home/Welcome/tabid/1394/Default.as px, download 26.10.2012, http://www.pompe-portal.de, download 29.10.2012). Glycogen storage diseases can be divided into two groups: muscle glycogenoses and liver glycogenoses. There are just a few reports in the literature about glycogen storage diseases and anesthesia. A literature search in PubMed/MEDLINE led to a number of 0 articles about glycogen storage diseases and © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 G. Bollig McArdle’s disease and anesthesia Table 2 Overview over glycogen storage diseases Type of glycogen storage disease Enzyme defect Inheritance Organs involved Glycogen synthase deficiency Type I Von Gierke disease Glucose-6phosphatase deficiency Autosomal recessive Liver, kidney Type II Pompe disease Acid maltase deficiency Autosomal recessive Muscle, heart, liver Hypotonia, muscle weakness (progressive), affection of proximal and respiratory muscle, cardiac enlargement and failure 17 Type III Cori disease Debrancher enzyme deficiency Autosomal recessive Liver, muscle, heart Growth retardation, muscle weakness (liver cirrhosis can occur) 3 Type IV Andersen disease Type V McArdle’s disease Branching enzyme deficiency Myophosphorylase deficiency Autosomal recessive Autosomal recessive Liver, kidney, heart, muscle Skeletal muscle Mild hypoglycemia 0 Type VI Hers disease Type VII Tarui disease Liver phosphorylase deficiency Phosphofructokinase deficiency Autosomal recessive Autosomal recessive Liver Mild hypoglycemia 0 Rhabdomyolysis, myoglobinuria, acute renal failure, weak association with MH, some cases tested MHS with IVCT (see discussion in the text and Table 3) No reports found Skeletal muscle 0 No reports found Type VIII Phosphorylase b kinase deficiency Phosphoglycerate kinase deficiency Phosphoglycerate mutase deficiency X-linked recessive Liver, brain Muscle pain and fatigue on exercise. Muscle cramps and tenderness. Ataxia, spasms, brain degeneration 0 No reports found X-linked recessive Autosomal recessive Liver Mild hypoglycemia 0 No reports found Liver, muscle Exercise intolerance, muscle pain 0 No reports found Type X Fasting hypoglycemia, tiredness, looking pale, vomiting, muscle cramps Growth retardation, hypoglycemia Exercise intolerance muscle cramps and muscle pain, myoglobinuria on strenuous exercise 0 Anesthesiological challenges (reference no.) Type 0 Type IX Liver Clinical symptoms PubMed articles on anesthesia (n =) 14 12 No reports found Hypoglycemia, metabolic acidosis, acute pancreatitis after propofol administration (28–30) Respiratory insufficiency, cardiomyopathy, arrhythmias, ventricular fibrillation ! Avoid propofol and sevoflurane. Ketamine recommended for induction. Enzyme replacement therapy possible (31–33) Hypoglycemia, muscle weakness, cardiomyopathy (34,35) No reports found Information provided in this table is based on (2,5,24–38) and http://mcardlesdisease.org, http://www.agsd.org.uk/Home/Welcome/tabid/1394/ Default.aspx, http://www.pompe-portal.de © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 821 McArdle’s disease and anesthesia anesthesia for type 0, IX, and X, 12 articles on glycogen storage disease type V (McArdle’s disease) up to 17 articles on glycogen storage disease type II (Pompe disease). Table 2 provides a brief overview over the different glycogen storage diseases and possible anesthesiological challenges. What should we do when giving anesthesia to patients with McArdle’s disease or myopathies with a possible association with MH? There is only weak support from the scientific literature for a connection between McAd and MH but there is controversy and uncertainty. As long as it remains unclear what a positive result of an IVCT means in patients with myopathies, it may be wise to avoid MHtrigger substances as far as possible. There is no definite answer whether inhaled induction can be recommend based on the present state of scientific knowledge. Therefore, inhaled induction cannot be recommended as a safe option for patients with McArdle’s disease so far (39). In contrast to this conclusion, Benca and Hogan (40) suggested that inhaled induction of anesthesia with sevoflurane or desflurane may be an option to place an IV catheter in patients with ‘rare enzyme defects’ (like McArdle’s disease). According to Litman and Rosenberg, there is still uncertainty about recommendations which patient groups do need a nontriggering technique and ‘…even the most authoritative MH experts were not sure and could not agree!’ (22). Until it has been proven that a positive IVCT in McAd is nonspecific and that there is no risk of MH at all, one should treat patients with McArdle’s disease as patients with the risk of developing MH or at least MH-like syndromes. Anesthesia for patients with McArdle’s disease should therefore avoid MH-trigger substances and consider the recommendations shown in Table 3, if not otherwise contraindicated (24). A similar strategy has been recommended by Choleva (41). On the other hand, there probably is an exception from this rule and a place for inhalation induction in children who suffer from myopathies with a weak association with MH, as McArdle’s disease, if there is no possibility to place an IV catheter in the starting phase of general anesthesia. From the author’s point of view, this could be acceptable but a nontriggering technique should be preferred for safety reasons whenever possible. As Davis and Brandom (23) as well as Veyckemans (42) have stated before that there is a need for a better definition of risk and more clinical data including an International Register for Anesthesia in children and adults with myopathies. This could lead to evidence-based recommendations for anesthesia in this patient group in the future. 822 G. Bollig Table 3 Checklist for the anesthesiological management of patients with McArdle’s disease A. For all patients with McArdle’s disease: Pre- and postoperative laboratory investigations: Creatine kinase, lactate dehydrogenase, transaminases, creatinine Glucose infusion can ensure availability of energy substrates Avoid the use of tourniquets (ischemia can lead to muscle damage) Avoid shivering (which can lead to muscle damage) Forced diuresis can be used to prevent renal failure in patients with myoglobinuria and high CK B. For all patients with McArdle’s disease who are malignant hyperthermia susceptible (=MHS) or not tested negative with the in vitro contracture test Loco/regional anesthesia if possible (and accepted by the patient) No prophylactic dantrolene Make sure that dantrolene is immediately available if needed Monitoring with ECG, blood pressure, SaO2 and PETCO2 The combination of capnography and low-flow anesthesia can help to detect a rise in CO2 at an early stage Consider if high risk to use central venous and arterial catheterization, with frequent blood gas analysis Consider 24-hour postoperative supervision in an intensive care unit Do not use MH-trigger substances as: depolarizing muscle relaxants of type succinylcholine All volatile anesthetics including halothane, enflurane, isoflurane, sevoflurane, desflurane ’Safe’ drugs can be used for MH-susceptible patients: Nitrous oxide Xenon Intravenous anesthetics, such as barbiturates, propofol, etomidate Benzodiazepines Opioids All nondepolarizing muscle relaxants Anticholinesterases and parasympatholytica Local anesthetics (ester and amide type) Catecholamines (if indicated) ’Safe’ drugs that can be used for MH-susceptible patients (but can cause sympathetic stimulation and/or a rise in body temperature) Ketamine Atropine Neuroleptika (butyrophenone and phenothiazine type) C. Be aware of clinical signs of MH: Increased oxygen consumption Rise in blood pressure Tachycardia Rise in ETCO2 Tachypnea during spontaneous ventilation Rise of temperature >2°C D. Measures in case of suspicious of intraoperative MH crisis: Treat as malignant hyperthermia according to present guidelines Stop all potential trigger substances 100% oxygen/normoventilation Finish/stop surgery as soon as possible Infusion of dantrolene 2.5 mg/kg i.v. initially can be repeated Other measures according to the clinical situation (buffer, betablockade, cooling, diuretics, etc.) Laboratory investigations: CK, lactate, myoglobin in serum and urine, glucose in serum, transaminases, and creatinine. © 2013 John Wiley & Sons Ltd Pediatric Anesthesia 23 (2013) 817–823 G. Bollig McArdle’s disease and anesthesia Acknowledgments Conflict of interest This research was carried out without funding. No conflicts of interest declared. References 1 Bollig G. 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