quinidine has been researched along with Electrocardiogram QT Prolonged in 48 studies
| Timeframe | Studies, this research(%) | All Research% |
|---|---|---|
| pre-1990 | 7 (14.58) | 18.7374 |
| 1990's | 8 (16.67) | 18.2507 |
| 2000's | 22 (45.83) | 29.6817 |
| 2010's | 7 (14.58) | 24.3611 |
| 2020's | 4 (8.33) | 2.80 |
| Authors | Studies |
|---|---|
| Antzelevitch, C; Barajas-Martinez, H; Burashnikov, A; Cox, R; Demitrack, MA; Fossler, MJ; Kleiman, RB; Kowey, P; Kramer, M | 1 |
| Kawai, T; Kuninishi, Y; Muraki, Y; Nogawa, H | 1 |
| Bastogne, T; Champéroux, P; Fares, R; Le Guennec, JY; Richard, S; Thireau, J | 1 |
| Aguilar, M; Cadrin-Tourigny, J; Compagno, P; Daval, C; Dyrda, K; Ortmans, S; Rivard, L; Tadros, R | 1 |
| Marai, I; Rosso, R; Viskin, S | 1 |
| Bergenholm, L; Chappell, MJ; Collins, T; Evans, ND; Mettetal, J; Parkinson, J | 1 |
| Hamlin, RL; Kijtawornrat, A; Limprasutr, V; Meedech, P; Saengklub, N | 1 |
| Crumb, WJ; Johannesen, L; Mason, JW; Pueyo, E; Stockbridge, N; Strauss, DG; Vicente, J | 1 |
| Dautova, Y; Grace, AA; Huang, CL; Sabir, I; Zhang, Y | 1 |
| Braam, SR; Meyer, T; Mummery, CL; Passier, R; Tertoolen, L; van de Stolpe, A | 1 |
| Heist, EK; Ruskin, JN | 1 |
| Kingery, JR; Kovacs, RJ; Overholser, BR; Tisdale, JE; Wroblewski, HA | 1 |
| Benest, AV; Hancox, JC; Masters, JD; Milnes, JT; Ridley, JM; Witchel, HJ | 1 |
| El-Eraky, H; Thomas, SH | 1 |
| Ackerman, MJ; Jahangir, A; Makielski, JC; Munger, TM; Porter, CB; Rok, BA; Tester, DJ; Valdivia, CR | 1 |
| Gonser, B; Günther, E; Leisgen, C; Meyer, T | 1 |
| Antzelevitch, C; Bauersfeld, U; Borggrefe, M; Brugada, R; Cordeiro, J; Dumaine, R; Gaita, F; Giustetto, C; Hong, K; Schimpf, R; Wolpert, C | 1 |
| Moss, AJ; Schwartz, PJ | 1 |
| George, AL; Kannankeril, PJ; Murray, KT; Norris, KJ; Roden, DM; Whalen, SP | 1 |
| Abe, J; Hamada, Y; Harada, T; Hashimoto, K; Horii, I; Sawada, Y; Shiotani, M | 1 |
| Roden, DM | 1 |
| Moss, AJ | 1 |
| Colledge, WH; Goddard, CA; Grace, AA; Huang, CL; Stokoe, KS; Thomas, G | 1 |
| Arefayene, M; Cho, KH; Flockhart, DA; Kang, WK; Kim, DI; Kim, DS; Kim, KA; Shin, JG; Shon, JH; Woosley, RL; Yoon, YR | 1 |
| Dolgosheĭ, TS; Kokhkovski, AB; Liskovich, TG; Madeshkina, GA; Mironchik, EV; Tyshchenko, AD | 1 |
| Goddard, CA; Grace, AA; Huang, CL; Jones, VJ; Li, LM; Sabir, IN | 1 |
| Li, B; Ma, Y; Pu, J; Quan, X; Zhang, C; Zhao, G | 1 |
| Futterman, LG; Lemberg, L | 1 |
| Bauman, JL; Gallastegui, JL; O'Toole, MF; Oberg, KC | 1 |
| Karch, M; Plewan, A; Schmidt, G; Schmitt, C; Schömig, A | 1 |
| Antzelevitch, C; Burashnikov, A; Di Diego, J; Nesterenko, VV; Saffitz, J; Shimizu, W; Sicouri, S; Thomas, GP; Weissenburger, J; Yan, GX | 1 |
| Iga, T; Minematsu, T; Ohtani, H; Sato, H | 1 |
| De Clerck, F; Lu, HR; Mariën, R; Saels, A | 1 |
| Shivkumar, K | 1 |
| Gutierrez, J; Raviña, T | 1 |
| Martins, JB | 1 |
| Imai, R; Tamura, T; Yamamoto, K; Yamamoto, M | 1 |
| Brown, AM; Ficker, E; Obejero-Paz, CA; Zhao, S | 1 |
| Lazzara, R | 1 |
| Inoue, H; Sugimoto, T | 1 |
| Lemery, R; Nattel, S; Ranger, S; Roy, D; Talajic, M | 1 |
| Denes, P; Ezri, MD; Fields, CD | 1 |
| Inoue, H; Mashima, S; Matsuo, H; Murakawa, Y; Nozaki, A; Sugimoto, T; Toda, I | 1 |
| Primm, RK; Roden, DM; Woosley, RL | 1 |
| Landow, L | 1 |
| Coumel, P; Lucet, V | 1 |
| Garson, A | 1 |
| Gardner, MJ; Josephson, ME; McCarthy, DM | 1 |
6 review(s) available for quinidine and Electrocardiogram QT Prolonged
| Article | Year |
|---|---|
Pharmacotherapy in inherited and acquired ventricular arrhythmia in structurally normal adult hearts.
Topics: Adrenergic beta-Antagonists; Anti-Arrhythmia Agents; Arrhythmias, Cardiac; Brugada Syndrome; Genetic Association Studies; Humans; Long QT Syndrome; Quinidine; Tachycardia, Ventricular | 2019 |
Drug-induced arrhythmia.
Topics: Antipsychotic Agents; Arrhythmias, Cardiac; Drug Interactions; Histamine Antagonists; Humans; Injections, Intravenous; Long QT Syndrome; Quinidine; Sodium Channel Blockers; Substance-Related Disorders; Syncope | 2010 |
25th anniversary of the International Long-QT Syndrome Registry: an ongoing quest to uncover the secrets of long-QT syndrome.
Topics: Death, Sudden, Cardiac; Emotions; ERG1 Potassium Channel; Ether-A-Go-Go Potassium Channels; Forecasting; Genotype; Humans; KCNQ Potassium Channels; KCNQ1 Potassium Channel; Long QT Syndrome; Muscle Proteins; NAV1.5 Voltage-Gated Sodium Channel; Potassium Channels, Voltage-Gated; Quinidine; Registries; Risk Factors; Sodium Channels | 2005 |
Long QT syndrome: reduced repolarization reserve and the genetic link.
Topics: Anti-Arrhythmia Agents; Disease Susceptibility; Female; Genotype; Histamine H1 Antagonists; Humans; Long QT Syndrome; Male; Polymorphism, Genetic; Quinidine; Risk Factors; Terfenadine; Torsades de Pointes | 2006 |
The M cell: its contribution to the ECG and to normal and abnormal electrical function of the heart.
Topics: Action Potentials; Animals; Electrocardiography; Enzyme Inhibitors; Heart Rate; Heart Ventricles; Humans; Ion Channels; Long QT Syndrome; Myocardium; Patch-Clamp Techniques; Quinidine; Torsades de Pointes | 1999 |
Mechanistic and clinical aspects of acquired long QT syndromes.
Topics: Action Potentials; Atrial Fibrillation; Electrocardiography; Humans; Long QT Syndrome; Procainamide; Quinidine | 1992 |
5 trial(s) available for quinidine and Electrocardiogram QT Prolonged
| Article | Year |
|---|---|
Predicting QRS and PR interval prolongations in humans using nonclinical data.
Topics: Animals; Anti-Arrhythmia Agents; Azabicyclo Compounds; Carbamates; Dogs; Drug Evaluation, Preclinical; Electrocardiography; Flecainide; Guinea Pigs; Heart; Heart Rate; Humans; Long QT Syndrome; Male; Models, Biological; Quinidine; Verapamil | 2017 |
Comprehensive T wave morphology assessment in a randomized clinical study of dofetilide, quinidine, ranolazine, and verapamil.
Topics: Adult; Calcium Channel Blockers; Cross-Over Studies; Electrocardiography; ERG1 Potassium Channel; Ether-A-Go-Go Potassium Channels; Female; Heart; Humans; Long QT Syndrome; Male; Phenethylamines; Quinidine; Ranolazine; Sodium Channel Blockers; Sulfonamides; Verapamil | 2015 |
Effects of sex on the pharmacokinetic and pharmacodynamic properties of quinidine.
Topics: Administration, Oral; Adolescent; Adult; Anti-Arrhythmia Agents; Electrocardiography; Female; Heart Rate; Humans; Long QT Syndrome; Male; Middle Aged; Quinidine; Sex Characteristics; Torsades de Pointes | 2003 |
Further insights into the effect of quinidine in short QT syndrome caused by a mutation in HERG.
Topics: Adolescent; Adult; Anti-Arrhythmia Agents; Cell Line; Dose-Response Relationship, Drug; Electrocardiography; ERG1 Potassium Channel; Ether-A-Go-Go Potassium Channels; Female; Heart Rate; Humans; Ion Channel Gating; Kidney; Long QT Syndrome; Male; Membrane Potentials; Mutation; Potassium Channels, Voltage-Gated; Quinidine | 2005 |
Possible interethnic differences in quinidine-induced QT prolongation between healthy Caucasian and Korean subjects.
Topics: Adult; Anti-Arrhythmia Agents; Asian People; Female; Humans; Long QT Syndrome; Male; Quinidine; White People | 2007 |
37 other study(ies) available for quinidine and Electrocardiogram QT Prolonged
| Article | Year |
|---|---|
Intracellular uptake of agents that block the hERG channel can confound the assessment of QT interval prolongation and arrhythmic risk.
Topics: Analgesics, Opioid; Animals; Arrhythmias, Cardiac; Cell Line; Cricetulus; ERG1 Potassium Channel; Humans; Inhibitory Concentration 50; Long QT Syndrome; Membrane Transport Modulators; Quinidine; Spiro Compounds; Thiophenes; Tissue Distribution; Voltage-Gated Sodium Channel Blockers | 2021 |
Pharmacological characterisation of electrocardiogram J-T
Topics: Animals; DNA-Binding Proteins; Electrocardiography; Flecainide; Guinea Pigs; Long QT Syndrome; Nifedipine; Quinidine; Quinine; Ranolazine; Sotalol; Torsades de Pointes; Verapamil | 2022 |
Contribution of haemodynamic side effects and associated autonomic reflexes to ventricular arrhythmias triggering by torsadogenic hERG blocking drugs.
Topics: Animals; Arrhythmias, Cardiac; Dogs; Drug-Related Side Effects and Adverse Reactions; Electrocardiography; Ether-A-Go-Go Potassium Channels; Heart Rate; Long QT Syndrome; Moxifloxacin; Quinidine; Reflex; Torsades de Pointes | 2022 |
Long QT Syndrome and Torsade de Pointes Ultimately Treated With Quinidine: Introducing the Concept of Pseudo-Torsade de Pointes.
Topics: Adrenergic alpha-Antagonists; Adult; Diagnosis, Differential; Electrocardiography; Female; Humans; Long QT Syndrome; Quinidine; Radiofrequency Ablation; Torsades de Pointes; Treatment Outcome | 2021 |
Characteristics of electromechanical window in anesthetized rabbit models of short QT and long QT syndromes.
Topics: Anesthesia; Animals; Arrhythmias, Cardiac; Benzopyrans; Biomarkers; Biomarkers, Pharmacological; Cromakalim; Disease Models, Animal; Electrocardiography; Isoflurane; Long QT Syndrome; Phenethylamines; Pinacidil; Quinidine; Rabbits; Risk; Sulfonamides; Systole; Torsades de Pointes; Ventricular Pressure | 2017 |
Atrial arrhythmogenesis in wild-type and Scn5a+/delta murine hearts modelling LQT3 syndrome.
Topics: Animals; Anti-Arrhythmia Agents; Atrial Fibrillation; Disease Models, Animal; Flecainide; Heart Rate; Humans; Long QT Syndrome; Mice; Mice, Transgenic; NAV1.5 Voltage-Gated Sodium Channel; Quinidine; Sodium Channels; Treatment Outcome | 2009 |
Prediction of drug-induced cardiotoxicity using human embryonic stem cell-derived cardiomyocytes.
Topics: Animals; Cell Line; Drug Evaluation, Preclinical; Drug-Related Side Effects and Adverse Reactions; Electrophysiology; Embryonic Stem Cells; Humans; Lidocaine; Long QT Syndrome; Mice; Myocytes, Cardiac; Patch-Clamp Techniques; Quinidine; Sotalol | 2010 |
High risk of QT interval prolongation and torsades de pointes associated with intravenous quinidine used for treatment of resistant malaria or babesiosis.
Topics: Adolescent; Adult; Aged; Antimalarials; Arrhythmias, Cardiac; Babesiosis; Female; Heart; Heart Rate; Humans; Long QT Syndrome; Malaria; Male; Middle Aged; Quinidine; Risk Factors; Torsades de Pointes | 2012 |
Characterisation of recombinant HERG K+ channel blockade by the Class Ia antiarrhythmic drug procainamide.
Topics: Anti-Arrhythmia Agents; Cation Transport Proteins; Cell Line; Cell Membrane; Disopyramide; DNA-Binding Proteins; Electrophysiology; ERG1 Potassium Channel; Ether-A-Go-Go Potassium Channels; Humans; Inhibitory Concentration 50; Long QT Syndrome; Membrane Potentials; Patch-Clamp Techniques; Potassium Channels; Potassium Channels, Voltage-Gated; Procainamide; Quinidine; Time Factors; Trans-Activators; Transcriptional Regulator ERG | 2003 |
A trafficking defective, Brugada syndrome-causing SCN5A mutation rescued by drugs.
Topics: Adolescent; Animals; Arrhythmias, Cardiac; Cell Line; Humans; Long QT Syndrome; Male; Mexiletine; Mutation, Missense; Myocardium; NAV1.5 Voltage-Gated Sodium Channel; Patch-Clamp Techniques; Pedigree; Quinidine; Sodium Channel Blockers; Sodium Channels; Transfection | 2004 |
QT-screen: high-throughput cardiac safety pharmacology by extracellular electrophysiology on primary cardiac myocytes.
Topics: Action Potentials; Animals; Cardiovascular Agents; Cells, Cultured; Chick Embryo; Dose-Response Relationship, Drug; Drug Evaluation, Preclinical; Electrophysiology; Extracellular Fluid; Long QT Syndrome; Myocytes, Cardiac; Quinidine | 2004 |
Genetic susceptibility to acquired long QT syndrome: pharmacologic challenge in first-degree relatives.
Topics: Anti-Arrhythmia Agents; Electrocardiography; Female; Genetic Predisposition to Disease; Humans; Long QT Syndrome; Male; Middle Aged; Quinidine | 2005 |
Practical application of guinea pig telemetry system for QT evaluation.
Topics: Animals; Anti-Arrhythmia Agents; Antipsychotic Agents; Bepridil; Cisapride; Disease Models, Animal; Electrocardiography; Guinea Pigs; Haloperidol; Heart; Humans; Injections, Intravenous; Long QT Syndrome; Male; Nifedipine; Pimozide; Piperidines; Pyridines; Quinidine; Reproducibility of Results; Telemetry; Terfenadine; Thioridazine | 2005 |
Drug-induced QT prolongation: an update.
Topics: Electrocardiography; Fluoroquinolones; Humans; Long QT Syndrome; Quinidine; Terfenadine | 2006 |
Effects of flecainide and quinidine on arrhythmogenic properties of Scn5a+/Delta murine hearts modelling long QT syndrome 3.
Topics: Action Potentials; Animals; Anti-Arrhythmia Agents; Disease Models, Animal; Electric Stimulation; Electrocardiography; Electrophysiology; Female; Flecainide; Heart; Heart Conduction System; In Vitro Techniques; Long QT Syndrome; Male; Mice; Mice, Transgenic; NAV1.5 Voltage-Gated Sodium Channel; Quinidine; Sodium Channels | 2007 |
[Long QT syndrome induced by cordaron and quinidine].
Topics: Amiodarone; Anemia, Hemolytic; Anti-Arrhythmia Agents; Female; Humans; Hypertension; Long QT Syndrome; Middle Aged; Myocardial Ischemia; Quinidine; Torsades de Pointes; Ventricular Fibrillation | 2007 |
Criteria for arrhythmogenicity in genetically-modified Langendorff-perfused murine hearts modelling the congenital long QT syndrome type 3 and the Brugada syndrome.
Topics: Action Potentials; Animals; Anti-Arrhythmia Agents; Brugada Syndrome; Cardiac Pacing, Artificial; Disease Models, Animal; Electrocardiography; Endocardium; Flecainide; Heart Rate; Long QT Syndrome; Mice; Mice, Transgenic; Models, Cardiovascular; NAV1.5 Voltage-Gated Sodium Channel; Perfusion; Pericardium; Quinidine; Sodium Channels; Time Factors | 2008 |
Effect of calcium-channel antagonist on repolarization heterogeneity of ventricular myocardium in an in vitro rabbit model of long QT syndrome.
Topics: Action Potentials; Animals; Anti-Arrhythmia Agents; Calcium Channel Blockers; Female; Heart Ventricles; In Vitro Techniques; Long QT Syndrome; Male; Myocardium; Quinidine; Rabbits; Tachycardia, Ventricular; Verapamil | 2007 |
The long QT syndrome: when syncope is common to the young and the elderly.
Topics: Age of Onset; Aged; Anti-Arrhythmia Agents; Bradycardia; Child; Clinical Protocols; Female; Heart; Humans; Ion Channel Gating; Long QT Syndrome; Male; Quinidine; Stellate Ganglion; Syncope; Torsades de Pointes; Water-Electrolyte Imbalance | 1995 |
"Late" proarrhythmia due to quinidine.
Topics: Aged; Aged, 80 and over; Atrial Fibrillation; Bradycardia; Drug Combinations; Electrocardiography; Female; Humans; Hypokalemia; Long QT Syndrome; Male; Middle Aged; Quinidine; Sick Sinus Syndrome; Time Factors; Torsades de Pointes | 1994 |
[Torsade de pointes tachycardia during administration of quinidine and verapamil in atrial fibrillation].
Topics: Aged; Anti-Arrhythmia Agents; Atrial Fibrillation; Drug Combinations; Electrocardiography; Fatal Outcome; Female; Heart Arrest; Humans; Long QT Syndrome; Quinidine; Torsades de Pointes; Verapamil | 1997 |
Pharmacokinetic/pharmacodynamic analysis of tacrolimus-induced QT prolongation in guinea pigs.
Topics: Animals; Guinea Pigs; Humans; Immunosuppressive Agents; Long QT Syndrome; Male; Quinidine; Tacrolimus | 1999 |
Are there sex-specific differences in ventricular repolarization or in drug-induced early afterdepolarizations in isolated rabbit purkinje fibers?
Topics: Action Potentials; Animals; Anti-Arrhythmia Agents; Electric Stimulation; Female; Isotonic Solutions; Long QT Syndrome; Male; Purkinje Fibers; Quinidine; Rabbits; Sex Factors; Solvents; Stimulation, Chemical; Ventricular Function | 2000 |
Images in cardiovascular medicine. Labile repolarization from "cell to bedside".
Topics: Anti-Arrhythmia Agents; Antiemetics; Electric Countershock; Female; Humans; Long QT Syndrome; Middle Aged; Prochlorperazine; Quinidine; Recurrence; Retreatment; Torsades de Pointes | 2000 |
Amiodarone-induced AV block and ventricular standstill. A forme fruste of an idiopathic long QT syndrome.
Topics: Aged; Amiodarone; Anti-Arrhythmia Agents; Drug Therapy, Combination; Electrocardiography; Electrophysiology; Female; Heart Block; Humans; Long QT Syndrome; Quinidine; Time Factors; Vasodilator Agents | 2000 |
How do I prolong QT? Let me count the ways.
Topics: Adrenergic alpha-Antagonists; Adrenergic beta-Antagonists; Anti-Arrhythmia Agents; Diet, Sodium-Restricted; Humans; Long QT Syndrome; Quinidine; Receptors, Adrenergic, beta | 2001 |
Acute canine model for drug-induced Torsades de Pointes in drug safety evaluation-influences of anesthesia and validation with quinidine and astemizole.
Topics: Acute Disease; Anesthesia; Anesthetics, Inhalation; Animals; Astemizole; Atrioventricular Node; Catheter Ablation; Disease Models, Animal; Dogs; Dose-Response Relationship, Drug; Drug Evaluation, Preclinical; Electric Stimulation; Electrocardiography; Female; Halothane; Heart Block; Isoflurane; Long QT Syndrome; Male; Pentobarbital; Quinidine; Sensitivity and Specificity; Torsades de Pointes | 2001 |
The binding site for channel blockers that rescue misprocessed human long QT syndrome type 2 ether-a-gogo-related gene (HERG) mutations.
Topics: Anti-Arrhythmia Agents; Astemizole; Benzimidazoles; Binding Sites; Blotting, Western; Cation Transport Proteins; Cell Line; Cell Membrane; Cisapride; DNA-Binding Proteins; Dose-Response Relationship, Drug; Electrophysiology; ERG1 Potassium Channel; Ether-A-Go-Go Potassium Channels; Gastrointestinal Agents; Histamine H1 Antagonists; Humans; Inhibitory Concentration 50; Ions; Long QT Syndrome; Models, Chemical; Mutagenesis, Site-Directed; Mutation; Patch-Clamp Techniques; Piperidines; Potassium Channels; Potassium Channels, Voltage-Gated; Protein Folding; Pyridines; Quaternary Ammonium Compounds; Quinidine; Structure-Activity Relationship; Trans-Activators; Transcriptional Regulator ERG | 2002 |
Torsades de pointes and ventricular fibrillation in a canine model of quinidine-induced QT prolongation.
Topics: Animals; Bretylium Tosylate; Cardiac Pacing, Artificial; Dogs; Female; Heart Conduction System; Isoproterenol; Lidocaine; Long QT Syndrome; Male; Models, Cardiovascular; Quinidine; Torsades de Pointes; Ventricular Fibrillation | 1992 |
Erythromycin-induced long QT syndrome: concordance with quinidine and underlying cellular electrophysiologic mechanism.
Topics: Action Potentials; Aged; Animals; Arrhythmias, Cardiac; Dogs; Electrocardiography; Erythromycin; Humans; In Vitro Techniques; Long QT Syndrome; Male; Purkinje Fibers; Quinidine; Tachycardia | 1990 |
"Quinidine syncope" without lengthening of Q-Tc interval in the presence of left bundle branch block. Role of programmed ventricular stimulation studies.
Topics: Aged; Arrhythmias, Cardiac; Bundle-Branch Block; Cardiac Pacing, Artificial; Electrocardiography; Electrophysiology; Female; Humans; Long QT Syndrome; Quinidine; Syncope; Tachycardia | 1988 |
Epicardial activation patterns of torsade de pointes in canine hearts with quinidine-induced long QT interval but without myocardial infarction.
Topics: Animals; Arrhythmias, Cardiac; Dogs; Electric Countershock; Electric Stimulation; Electrocardiography; Female; Heart Ventricles; Long QT Syndrome; Male; Quinidine; Tachycardia | 1986 |
Incidence and clinical features of the quinidine-associated long QT syndrome: implications for patient care.
Topics: Adolescent; Adult; Aged; Arrhythmias, Cardiac; Digoxin; Electrocardiography; Female; Heart Ventricles; Humans; Long QT Syndrome; Male; Middle Aged; Potassium; Quinidine; Tachycardia | 1986 |
Do not discontinue antiarrhythmic drugs preoperatively.
Topics: Anti-Arrhythmia Agents; Electrocardiography; Humans; Long QT Syndrome; Preoperative Care; Quinidine; Tachycardia | 1986 |
[Torsade de pointes syndromes. Variations and limits].
Topics: Adult; Autonomic Nervous System; Bradycardia; Child; Electrocardiography; Female; Humans; Long QT Syndrome; Male; Physical Exertion; Quinidine; Tachycardia; Water-Electrolyte Imbalance | 1986 |
Medicolegal problems in the management of cardiac arrhythmias in children.
Topics: Arrhythmias, Cardiac; Child; Child, Preschool; Humans; Infant, Newborn; Long QT Syndrome; Malpractice; Quinidine; Sick Sinus Syndrome; Tachycardia, Supraventricular; Verapamil | 1987 |
Effect of myocardial ischemia and type I antiarrhythmic drug therapy on exercise QT intervals.
Topics: Anti-Arrhythmia Agents; Coronary Disease; Disopyramide; Electrocardiography; Exercise Test; Heart Conduction System; Humans; Long QT Syndrome; Male; Middle Aged; Procainamide; Quinidine | 1985 |