Thyrotoxic periodic paralysis (TPP) is a rare manifestation of hyperthyroidism characterized by muscle weakness and hypokalemia. All ethnicities can be affected, but TPP typically presents in men of Asian descent. The most common cause of TPP in thyrotoxicosis is Graves' disease. However, TPP can occur with any form of thyrotoxicosis. Up to our knowledge, very few cases ever reported the relationship between TPP and painless thyroiditis. We herein report a 25-yr-old Korean man who suffered from flaccid paralysis of the lower extremities and numbness of hands. The patient was subsequently diagnosed as having TPP associated with transient thyrotoxicosis due to painless thyroiditis. The paralytic attack did not recur after improving the thyroid function. Therefore, it is necessary that early diagnosis of TPP due to transient thyrotoxicosis is made to administer definite treatment and prevent recurrent paralysis.
Administration, Oral ; Adult ; Anti-Arrhythmia Agents/therapeutic use ; Humans ; Hypokalemic Periodic Paralysis/*diagnosis/drug therapy/etiology ; Male ; Organotechnetium Compounds/chemistry/diagnostic use ; Potassium Chloride/therapeutic use ; Propranolol/therapeutic use ; Radiopharmaceuticals/diagnostic use ; Thyroiditis/*complications/radiography/ultrasonography ; Thyrotoxicosis/*diagnosis/etiology

Due to the complicated pathogenesis of cardiac arrhythmia, the safe and effective therapeutic strategies for cardiac arrhythmia remain an urgent medical problems in the recent years. In this paper, we introduced the research practice of anti-arrhythmic agents targeting on potassium ion channel. The research progress of anti-arrhythmic agents in up-to-date literatures were also reviewed and prospected.
Amiodarone ; analogs & derivatives ; chemistry ; pharmacology ; therapeutic use ; Animals ; Anti-Arrhythmia Agents ; chemistry ; pharmacology ; therapeutic use ; Arrhythmias, Cardiac ; drug therapy ; physiopathology ; Humans ; Hydantoins ; Imidazolidines ; chemistry ; pharmacology ; therapeutic use ; Molecular Structure ; Piperazines ; chemistry ; pharmacology ; therapeutic use ; Potassium Channel Blockers ; pharmacology ; therapeutic use ; Potassium Channels ; drug effects

In order to explore the scientific connotation of "Fangzhengduiying (formula corresponding to pattern types)", "Qiyinliangxuzheng (Qi and Yin deficiency pattern)" of myocardial ischemia rat model and GC-TOF/MS based metabonomic method were used for comparing the effects of Sheng-mai injection, Salvia injection and propranolol in the present study. After data processing and pattern recognition, Sheng-mai injection showed better efficacy than the other two drugs in accordance with not only visual observation from PLS-DA scores plots but also the number of abnormal endogenous compounds restored to the normal level. Further studies showed that Sheng-mai injection could normalize the level of plasma endothelin-1, the index related to cardiovascular diseases and sleep disorders, which verified the results of metabonomics. Finally, the regulated metabolites and related metabolic pathways were analyzed, and it was supposed that the effects of Sheng-mai injection involved in the alternation of energy metabolism, lipid metabolism, amino acids metabolism, and so on. These findings provided scientific evidence to Shengmai "Fang" used for "Qi and Yin deficiency pattern" correspondingly, indicating that metabonomics has great potential in traditional Chinese medical research, which provides a novel approach and way to modernization of traditional Chinese medicine.
Animals ; Anti-Arrhythmia Agents ; pharmacology ; Drug Combinations ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; pharmacology ; Endothelin-1 ; blood ; Gas Chromatography-Mass Spectrometry ; methods ; Injections ; Male ; Medicine, Chinese Traditional ; Metabolomics ; methods ; Myocardial Ischemia ; blood ; metabolism ; pathology ; Panax ; chemistry ; Plants, Medicinal ; chemistry ; Propranolol ; pharmacology ; Qi ; Rats ; Rats, Sprague-Dawley ; Salvia ; chemistry ; Schisandraceae ; chemistry ; Yin Deficiency ; metabolism

OBJECTIVETo observe the effect of total flavonoids from Scutellaria amoena on the experimental arrhythmia.

METHODExperimental animals anesthetized with 10% chloral hydrate were evenly randomized into control group, positive control group, and low-dose, middle-dose and high-dose total flavonoids groups. The experimental arrhythmia ouabain-induced in guinea pigs and barium chloride or calcium chloride-induced in rats were observed and detected respectively. The result was converted into cumulative dosage of ouabain, in guinea pig model. In rat model, the duration of arrhythmia were detected.

RESULThold dosage of ventricular premature heat (VP) and ventricular fibrillation( VF) ouabain-induced in guinea pigs was markedly elevated, and the duration of ventricular tachycardia (VT) barium chloride-induced and VF calcium chloride-induced in rats was postponed by total flavonoids from S. amoena.

CONCLUSIONTotal flavonoids from S. amoena has obvious protective effect on drug-induced arrhythmia.

Animals ; Anti-Arrhythmia Agents ; administration & dosage ; Arrhythmias, Cardiac ; drug therapy ; Disease Models, Animal ; Female ; Flavonoids ; administration & dosage ; Guinea Pigs ; Humans ; Male ; Plant Extracts ; administration & dosage ; Rats ; Rats, Sprague-Dawley ; Scutellaria ; chemistry

OBJECTIVETo investigate the effect of ethyl acetate extract from Chrysanthemum Morifolium Ramat (CME) on experimental arrhythmia induced by ischemia/reperfusion or aconitine in rats and to explore its underlying mechanisms.

METHODSArrhythmia model in intact rat was induced by aconitine (30 microg/kg body weight, i.v.). In isolated Langendorff perfused rat hearts, regional ischemia and reperfusion was induced by ligation and release of left anterior descending artery. The ventricular fibrillation threshold (VFT), effective refractory period (ERP), and diastolic excitation threshold (DET) in the isolated heart were measured. The action potentials of papillary muscle in rat right ventricle were recorded by conventional glass microelectrode technique.

RESULTSCompared with control group CME significantly decreased the number and duration of ventricular tachycardia (VT); delayed the occurrence of ventricular premature beats (VPB) and VT induced by aconitine. Arrhythmia score of the CME group was lower than that in aconitine-treated group. CME markedly prolonged the ERP and increased the VFT in the isolated perfused rat hearts during ischemia and reperfusion. CME prolonged action potential duration at 50% and 90% repolarization of the right ventricular papillary muscles and decreased the maximal rate of rise of the action potential upstroke, but did not affect the resting potential, amplitude of action potential.

CONCLUSIONCME can reduce myocardial vulnerability and exerts its antiarrhythmic effects induced by aconitine or ischemia/reperfusion, which may be related to its prolongation of action potential duration and effective refractory period that enhance the electrophysiological stability of myocardiaium.

Acetates ; chemistry ; Action Potentials ; drug effects ; Animals ; Anti-Arrhythmia Agents ; isolation & purification ; pharmacology ; Arrhythmias, Cardiac ; chemically induced ; physiopathology ; Chrysanthemum ; chemistry ; Drugs, Chinese Herbal ; pharmacology ; In Vitro Techniques ; Male ; Rats ; Rats, Sprague-Dawley ; Refractory Period, Electrophysiological ; drug effects

Human ether-a-go-go-related gene (HERG) encodes the rapid component of the cardiac delayed rectifier K+ current, which has an important effect on both proarrhythmia and antiarrhythmia. To investigate the effect of sophocarpine (SC) on HERG channel stably expressing in human embryonic kidney-293 (HEK293) cells, whole-cell patch-clamp technique was used to record HERG current and kinetic curves. As the result, it was found that SC inhibited HERG current in a concentration-dependent manner (10, 30, 100, and 300 micromol x L(-1)). At 0 mV, 10, 30, 100, and 300 micromol x L(-1) SC respectively inhibited IHERG by Istep ( 10.7 +/- 2.8)% , (11.3 +/- 5.5)% , (47.0 +/- 2.3)% and (53.7 +/- 2.5)% , and Itail (1.1 +/- 3.0)%, (17.1 +/- 3.3)%, (32.7 +/- 1.9)% (P < 0.05, n = 12) and (56.0 +/- 2.4)% (P < 0.05, n = 13). The time constants of inactivation, recovery from inactivation and onset of inactivation were accelerated. SC did not change other channel kinetics (activation and deactivation). It is concluded that SC inhibited the transfected HERG channels by influencing the inactivation state, which is the probable anti-arrhythmic mechanism.
Alkaloids ; pharmacology ; Anti-Arrhythmia Agents ; pharmacology ; Cell Line ; Dose-Response Relationship, Drug ; Ether-A-Go-Go Potassium Channels ; antagonists & inhibitors ; metabolism ; physiology ; Humans ; Kidney ; cytology ; Kinetics ; Membrane Potentials ; drug effects ; Patch-Clamp Techniques ; Plants, Medicinal ; chemistry ; Sophora ; chemistry

Because HERG potassium channel has important effects on both proarrhythmia and antiarrhythmia, we use immunofluorescence and Western blotting methods to detect the expression of HERG channel of HERG-HEK cells in different concentrations of matrine, oxymatrine and resveratrol. The findings showed that both matrine (1 micromol x L(-1) ) and oxymatrine ( 1micromol x L (-1) ) increased HERG channel expression ( n = 5, P < 0. 05 ) , while matrine (100 micromol x L(-1) ) decreased HERG channel expression ( n = 5, P < 0. 05), resveratrol didn't affect HERG channel expression. In conclusion, different concentrations of matrine and oxymatrine affect HERG channel expression, while there is no relationship between resveratrol and HERG channel expression. It provides a theoretical support for the safety and mechanism of anti-arrhythmic drugs.
Alkaloids ; pharmacology ; Anti-Arrhythmia Agents ; pharmacology ; Blotting, Western ; Cell Line ; Dose-Response Relationship, Drug ; ERG1 Potassium Channel ; Ether-A-Go-Go Potassium Channels ; genetics ; metabolism ; physiology ; Fluorescent Antibody Technique ; Humans ; Membrane Potentials ; drug effects ; Patch-Clamp Techniques ; Plants, Medicinal ; chemistry ; Quinolizines ; pharmacology ; Sophora ; chemistry ; Stilbenes ; pharmacology

Rapidly activating component of delayed rectifier potassium current (I(Kr)) plays a key role in the repolarization phase of cardiac action potential. Human ether-a-go-go-related gene (HERG) encodes the alpha subunit of this potassium channel. Mutations of HERG gene induce genetic long QT syndrome (LQTS). Furthermore, I(Kr)/HERG is the target of some drugs which may cause cardiac QT interval prolongation. Some other drugs with different chemical structures also may block the channel and prolong QT interval, which even developed into acquired arrhythmias. This review summarized the recent progress of structure, gating mechanisms and functions of I(Kr)/HERG channel, I(Kr)/HERG related arrhythmias, interaction between K+ channel and drugs, and strategies of grading-up the I(Kr)/HERG target.
Anti-Arrhythmia Agents ; adverse effects ; pharmacology ; therapeutic use ; Arrhythmias, Cardiac ; drug therapy ; metabolism ; Ether-A-Go-Go Potassium Channels ; antagonists & inhibitors ; chemistry ; genetics ; metabolism ; Humans ; Ion Channel Gating ; Long QT Syndrome ; drug therapy ; etiology ; genetics ; metabolism ; Mutation ; Potassium Channel Blockers ; pharmacology

OBJECTIVETo study the plasma concentration-time curve, pharmacokinetic parameters and bioavilability of oxymatrine-phospholipid complex and to compare with oxymatrine in rats.

METHODRats were given oxymatrine-phospholipid 100 mg x kg(-1). Blood samples were collected at different times after oral administration. The internal standard was cimetidine. Protein in plasma was precipitated with merhanol and centrifuged at high speed. The supernatant was directly injected and assayed by CE method. The running buffer was 0.04 mol x L(-1) Tris-10 mmol x L(-1) sodium phosphate monobasic-40% isopropanol pH to 7.6 with phosphoric acid. The wavelength of detection was 205 nm.

RESULTThe AUC of oxymatrine and oxymatrine-phospholipid complex were 4.52 mg x mL(-1) x h(-1) and 6.21 mg x mL(-1) x h(-1), respectively. The oxymatrine-phospholipid bioavailability enhanced 1.4 times.

CONCLUSIONIt is concluded that after oral administration of oxymatrine-phospholipid complex in rats the bioavailability of oxymatrine is increased greatly. This is mainly due to an obvious improvement of the lipophilic property of oxymatrine-phospholipid complex compared with oxymatrine material and an increase in gastrointestinal absorption.

Administration, Oral ; Alkaloids ; administration & dosage ; chemistry ; pharmacokinetics ; Animals ; Anti-Arrhythmia Agents ; administration & dosage ; chemistry ; pharmacokinetics ; Area Under Curve ; Biological Availability ; Male ; Phospholipids ; chemistry ; Plants, Medicinal ; chemistry ; Quinolizines ; administration & dosage ; chemistry ; pharmacokinetics ; Rats ; Rats, Wistar ; Sophora ; chemistry

The treatment of roasted liquorice decoction on the disease cause and pathogenesis, pharmacology study and the clinical study were analyzed. roasted liquorice decoction can replenishing yin and supplementing blood, activating yang and returning pulse and its antiarrhythmic effect may involve in influencing action potential of myocardial, inhabiting platelet activate and protecting endothelial cells.
Action Potentials ; drug effects ; Animals ; Anti-Arrhythmia Agents ; pharmacology ; therapeutic use ; Arrhythmias, Cardiac ; drug therapy ; physiopathology ; Drug Combinations ; Drugs, Chinese Herbal ; isolation & purification ; pharmacology ; therapeutic use ; Glycyrrhiza ; chemistry ; Humans ; Plants, Medicinal ; chemistry ; Ventricular Premature Complexes ; drug therapy ; enzymology ; physiopathology