{"Name":"Hyperkalemic periodic paralysis","DiseaseID__c":"GARD:0000195","id":195,"encodedName":"hyperkalemic-periodic-paralysis","IsDeleted":false,"Disease_Name_Full__c":"Hyperkalemic periodic paralysis","Xref_IDs__c":"304737009; C0238357; C123429; D020513; DOID:14451; MEDGEN:68665; MONDO:0008224; OMIM:170500; ORPHA:682","USA_Estimate__c":"5,000","No_of_Specialist_Tagsa__c":4,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"8,000 to 80,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":5,"Disease_Characteristics_Score__c":7,"No_of_Age_at_Onset__c":1,"Description_Source__c":"MONDO:0008224","Disease_Description__c":"A rare muscle disorder characterized by episodic attacks of muscle weakness associated with an increase in serum potassium concentration.","GARD_Name__c":"Hyperkalemic periodic paralysis","GARD_Synonym__c":"adynamia episodica hereditaria; adynamia episodica hereditaria with or without myotonia; familial hyperkalemic periodic paralysis; familial hyperkalemic periodic paralysis (disorder) [ambiguous]; familial hyperpp; gamstorp disease; gamstorp episodic adynamy; hyperkalemic periodic paralysis, type 2; hyperkalemic pp; hyperkpp; hyperpp; hypp; normokalemic periodic paralysis, potassium-sensitive; periodic hyperkalemic paralysis; periodic paralysis ii; primary hyperkalemic periodic paralysis; primary hyperpp","Curated_Disease_Description_Source__c":"GARD:0000195","Curated_Disease_Description__c":"Hyperkalemic periodic paralysis is a condition that causes episodes of extreme muscle weakness or paralysis, usually beginning in infancy or early childhood. Most often, these episodes involve a temporary inability to move muscles in the arms and legs. Episodes tend to increase in frequency until mid-adulthood, after which they occur less frequently in many people with the condition. Factors that can trigger attacks include rest after exercise, potassium-rich foods such as bananas and potatoes, stress, fatigue, alcohol, pregnancy, exposure to hot or cold temperatures, certain medications, and periods without food (fasting). Muscle strength usually returns to normal between attacks, although many affected people continue to experience mild stiffness (myotonia), particularly in muscles of the face and hands. Most people with hyperkalemic periodic paralysis have increased levels of potassium in their blood (hyperkalemia) during attacks. Hyperkalemia results when the weak or paralyzed muscles release potassium ions into the bloodstream. In other cases, attacks are associated with normal blood potassium levels (normokalemia). Ingesting potassium can trigger attacks in affected individuals, even if blood potassium levels do not go up.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"5,000","Age_at_Onset_Snippet_Text__c":"as a Child","SourceID__c":"ORPHA:682","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0008224","ORPHANET_ID__c":"ORPHA:682","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Parálisis periódica hiperpotasémica","Spanish_Description_Source__c":"ORPHA:682","Spanish_Description__c":"Es un trastorno muscular caracterizado por ataques episódicos de debilidad muscular asociados a un aumento de la concentración de potasio en suero.","Spanish_Disease_Name__c":"parálisis periódica hiperpotasémica","Spanish_GARD_Synonym__c":"adinamia episódica de gamstorp; adinamia episódica hereditaria; enfermedad de gamstorp; hiperkpp; hiperpp; hiperpp familiar; hiperpp primaria; hypp; parálisis periódica hipercaliémica; parálisis periódica hipercalémica; parálisis periódica hipercalémica primaria; pp hipercalémica","Category_Linearization__c":"ORPHA:98006","icd10_id__c":null,"mesh_id__c":null,"omim_id__c":null,"snomed_id__c":null,"umls_id__c":null,"GARD_Disease__c":[{"Curated_Disease_Description__c":"Hyperkalemic periodic paralysis is a condition that causes episodes of extreme muscle weakness or paralysis, usually beginning in infancy or early childhood. Most often, these episodes involve a temporary inability to move muscles in the arms and legs. Episodes tend to increase in frequency until mid-adulthood, after which they occur less frequently in many people with the condition. Factors that can trigger attacks include rest after exercise, potassium-rich foods such as bananas and potatoes, stress, fatigue, alcohol, pregnancy, exposure to hot or cold temperatures, certain medications, and periods without food (fasting). Muscle strength usually returns to normal between attacks, although many affected people continue to experience mild stiffness (myotonia), particularly in muscles of the face and hands. Most people with hyperkalemic periodic paralysis have increased levels of potassium in their blood (hyperkalemia) during attacks. Hyperkalemia results when the weak or paralyzed muscles release potassium ions into the bloodstream. In other cases, attacks are associated with normal blood potassium levels (normokalemia). Ingesting potassium can trigger attacks in affected individuals, even if blood potassium levels do not go up.","Curated_Disease_Description_Source__c":"GARD:0000195","GARD_Synonym__c":"adynamia episodica hereditaria; adynamia episodica hereditaria with or without myotonia; familial hyperkalemic periodic paralysis; familial hyperkalemic periodic paralysis (disorder) [ambiguous]; familial hyperpp; gamstorp disease; gamstorp episodic adynamy; hyperkalemic periodic paralysis, type 2; hyperkalemic pp; hyperkpp; hyperpp; hypp; normokalemic periodic paralysis, potassium-sensitive; periodic hyperkalemic paralysis; periodic paralysis ii; primary hyperkalemic periodic paralysis; primary hyperpp","Name":"Hyperkalemic periodic paralysis","Curated_USA_Estimate__c":"5,000","estimateUsa":"5,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Periodic Paralysis Association","Website__c":"https://periodicparalysis.org/"},{"Account_Name__c":"Periodic Paralysis International","Website__c":"https://www.hkpp.org/"},{"Account_Name__c":"Muscular Dystrophy Association","Website__c":"https://www.mda.org"},{"Account_Name__c":"Muscular Dystrophy UK","Website__c":"https://www.musculardystrophyuk.org/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Genetics","Tag_Category__c":"Cause;Disease Category;Specialist","category_description":"Genetic diseases affect the DNA, or genetic instructions, which directs how tissues, organs, and body systems function.","curated_tag_name":"Genetic diseases"},{"Tag_Name__c":"Neurology","Tag_Category__c":"Disease Category;Specialist","category_description":"Neurological diseases affect the brain, spinal cord, cranial nerves, autonomic nerves, or other peripheral nerves.","curated_tag_name":"Neurological diseases"},{"Tag_Name__c":"Neuromuscular medicine","Tag_Category__c":"Specialist","curated_tag_name":"Neuromuscular medicine"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Childhood","Provided_By__c":"ORPHA:682"}],"Diagnosis__c":[{"Type__c":"GTR","Curie__c":"MEDGEN:C0238357"},{"Type__c":"GTR","Curie__c":"MEDGEN:C0268445"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0000195","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1496","Source__c":"Gene Review","Xref__c":"NBK1496"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C0238357","Source__c":"C0238357","Xref__c":"C0238357"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=304737009","Source__c":"C0238357; MONDO:0008224","Xref__c":"304737009"},{"URL__c":"https://www.orpha.net/en/disease/detail/682","Source__c":"MONDO:0008224","Xref__c":"ORPHA:682"},{"URL__c":"https://www.omim.org/entry/170500","Source__c":"C0238357; MONDO:0008224; ORPHA:682","Xref__c":"OMIM:170500"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=68665","Source__c":"C0238357","Xref__c":"MEDGEN:68665"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C020513","Source__c":"C0238357; MONDO:0008224","Xref__c":"D020513"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A14451","Source__c":"MONDO:0008224","Xref__c":"DOID:14451"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C123429","Source__c":"C0238357; MONDO:0008224","Xref__c":"C123429"},{"URL__c":"https://hpo.jax.org/browse/term/HP:0007215","Source__c":"C0238357","Xref__c":"HP:0007215"},{"URL__c":"https://medlineplus.gov/genetics/condition/hyperkalemic-periodic-paralysis","Source__c":"GARD:0000195","Xref__c":"https://medlineplus.gov/genetics/condition/hyperkalemic-periodic-paralysis"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0008224","Source__c":"GARD:0000195","Xref__c":"MONDO:0008224"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"SCN4A","GHR_URL__c":"https://medlineplus.gov/genetics/gene/scn4a","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Impaired feeding performance of an infant as manifested by difficulties such as weak and ineffective sucking, brief bursts of sucking, and falling asleep during sucking. There may be difficulties with chewing or maintaining attention.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008872","HPO_Name__c":"Feeding difficulties in infancy","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of an abnormality of cardiac function that is responsible for the failure of the heart to pump blood at a rate that is commensurate with the needs of the tissues or a state in which abnormally elevated filling pressures are required for the heart to do so. Heart failure is frequently related to a defect in myocardial contraction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001635","HPO_Synonym__c":"Cardiac failure; Cardiac failures; Cardiac insufficiency; CHF; Chronic heart failure; Heart failure","HPO_Name__c":"Congestive heart failure","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Ophthalmoplegia is a paralysis or weakness of one or more of the muscles that control eye movement.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000597","HPO_Synonym__c":"Extraocular muscle palsy; Extraocular muscle paralysis; Weakness of extraocular eye movement; Weakness of muscles controlling eye movement","HPO_Name__c":"Ophthalmoparesis","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002093","HPO_Synonym__c":"Respiratory impairment","HPO_Name__c":"Respiratory insufficiency","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal sensations such as tingling, pricking, or numbness of the skin with no apparent physical cause.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003401","HPO_Synonym__c":"Paresthesias; Pins and needles feeling; Tingling","HPO_Name__c":"Paresthesia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Recurrent episodes of muscle flaccidity, a type of paralysis in which a muscle becomes soft and yields to passive stretching.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003752","HPO_Name__c":"Episodic flaccid weakness","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormally increased potassium concentration in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002153","HPO_Synonym__c":"Increased circulating potassium concentration","HPO_Name__c":"Hyperkalemia","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A disorder of muscle unrelated to impairment of innervation or neuromuscular junction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003198","HPO_Synonym__c":"Muscle tissue disease; Myopathic changes","HPO_Name__c":"Myopathy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal increase in muscle size and mass not due to training.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003712","HPO_Synonym__c":"Hypertrophic muscles; Increased skeletal muscle cells; Muscle hypertrophy; Muscular hypertrophy","HPO_Name__c":"Skeletal muscle hypertrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormally decreased potassium concentration in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002900","HPO_Synonym__c":"Low blood potassium levels","HPO_Name__c":"Hypokalemia","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001276","HPO_Synonym__c":"Hypertonicity; Increased muscle tone","HPO_Name__c":"Hypertonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An involuntary and painless delay in the relaxation of skeletal muscle following contraction or electrical stimulation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002486","HPO_Synonym__c":"Delayed relaxation of muscle fibers after contraction","HPO_Name__c":"Myotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Malignant hyperthermia is characterized by a rapid increase in temperature to 39-42 degrees C. Malignant hyperthermia may occur in response to either inhalational anesthetics such as halothane, to muscle relaxants such as succinylcholine, or to exercise.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002047","HPO_Name__c":"Malignant hyperthermia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The term gait disturbance can refer to any disruption of the ability to walk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001288","HPO_Synonym__c":"Abnormal gait; Abnormal walk; Difficulty in walking; Gait abnormalities; Gait difficulties; Gait disturbances; Impaired gait; Walking disability","HPO_Name__c":"Gait disturbance","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Diminution of tendon reflexes, which is an invariable sign of peripheral nerve disease.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001315","HPO_Synonym__c":"Absent or decreased deep tendon reflexes; Decreased deep tendon reflexes; Decreased tendon reflexes; Decreased to absent deep tendon reflexes; Decreased/absent deep tendon reflexes; Depressed tendon reflexes; Diminished deep tendon reflexes; Diminished or absent deep tendon reflexes; Diminished or absent tendon reflexes; Hypoactive to absent deep tendon reflexes; Impaired tendon reflexes; Reduced/absent deep tendon reflexes; Weak or absent deep tendon reflexes","HPO_Name__c":"Reduced tendon reflexes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Involuntary fecal soiling in adults and children who have usually already been toilet trained.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002607","HPO_Synonym__c":"Anal incontinence; Fecal incontinence; Loss of bowel control","HPO_Name__c":"Bowel incontinence","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormal results of investigations using electromyography (EMG).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003457","HPO_Synonym__c":"Abnormal electromyography finding; Abnormal EMG; Electromyogram abnormal; EMG abnormalities","HPO_Name__c":"EMG abnormality","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Procedure_EMG"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An elevation of the level of the enzyme creatine kinase (also known as creatine phosphokinase (CK; EC 2.7.3.2) in the blood. CK levels can be elevated in a number of clinical disorders such as myocardial infarction, rhabdomyolysis, and muscular dystrophy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003236","HPO_Synonym__c":"Elevated blood creatine phosphokinase; Elevated circulating creatine phosphokinase; Elevated creatine kinase; Elevated serum CPK; Elevated serum creatine kinase; Elevated serum creatine phosphokinase; High serum creatine kinase; Increased CPK; Increased creatine kinase; Increased creatine phosphokinase; Increased serum CK; Increased serum creatine kinase; Increased serum creatine phosphokinase","HPO_Name__c":"Elevated circulating creatine kinase concentration","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of skeletal muscular atrophy (which is also known as amyotrophy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003202","HPO_Synonym__c":"Amyotrophy; Amyotrophy involving the extremities; Muscle atrophy; Muscle atrophy, neurogenic; Muscle degeneration; Muscle hypotrophy; Muscle wasting; Muscular atrophy; Neurogenic muscle atrophy; Neurogenic muscle atrophy, especially in the lower limbs; Neurogenic muscular atrophy","HPO_Name__c":"Skeletal muscle atrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Fasciculations are observed as small, local, involuntary muscle contractions (twitching) visible under the skin. Fasciculations result from increased irritability of an axon (which in turn is often a manifestation of disease of a motor neuron). This leads to sporadic discharges of all the muscle fibers controlled by the axon in isolation from other motor units.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002380","HPO_Synonym__c":"Fasciculation; Muscle fasciculation; Muscle twitch","HPO_Name__c":"Fasciculations","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Episodes of muscle weakness associated with elevated levels of potassium in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007215","HPO_Synonym__c":"Hyperkalemic periodic paralysis","HPO_Name__c":"Periodic hyperkalemic paralysis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Cerebral palsy describes a group of permanent disorders of the development of movement and posture, causing activity limitation, that are attributed to nonprogressive disturbances that occurred in the developing fetal or infant brain. The motor disorders of cerebral palsy are often accompanied by disturbances of sensation, perception, cognition, communication, and behavior, by epilepsy, and by secondary musculoskeletal problems.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100021","HPO_Synonym__c":"Cerebral paralysis; CP","HPO_Name__c":"Cerebral palsy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Pain in muscle.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003326","HPO_Synonym__c":"Muscle ache; Muscle pain","HPO_Name__c":"Myalgia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Any cardiac rhythm other than the normal sinus rhythm. Such a rhythm may be either of sinus or ectopic origin and either regular or irregular. An arrhythmia may be due to a disturbance in impulse formation or conduction or both.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011675","HPO_Synonym__c":"Abnormal heart rate; Arrhythmias; Cardiac arrhythmia; Cardiac arrhythmias; Cardiac rhythm disturbances; Heart rhythm disorders; Irregular heart beat; Irregular heartbeat","HPO_Name__c":"Arrhythmia","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormally decreased sodium concentration in the blood.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002902","HPO_Synonym__c":"Low blood sodium levels","HPO_Name__c":"Hyponatremia","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An unpleasant sensation characterized by physical discomfort (such as pricking, throbbing, or aching) localized to the chest.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100749","HPO_Synonym__c":"Chest pain; Thoracic pain","HPO_Name__c":"Chest pain","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:682","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001371","HPO_Synonym__c":"Flexed joint that cannot be straightened; Flexion contractures; Flexion contractures of joints","HPO_Name__c":"Flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Neuromuscular medicine","Pediatrics"]},"synonyms":["adynamia episodica hereditaria"," adynamia episodica hereditaria with or without myotonia"," familial hyperkalemic periodic paralysis"," familial hyperkalemic periodic paralysis (disorder) [ambiguous]"," familial hyperpp"," gamstorp disease"," gamstorp episodic adynamy"," hyperkalemic periodic paralysis, type 2"," hyperkalemic pp"," hyperkpp"," hyperpp"," hypp"," normokalemic periodic paralysis, potassium-sensitive"," periodic hyperkalemic paralysis"," periodic paralysis ii"," primary hyperkalemic periodic paralysis"," primary hyperpp"]}