Electrocardiography ; Humans ; Tachycardia, Sinus/diagnosis*

Since inappropriate sinus tachycardia (IST) occurs due to various reasons, it can be diagnosed after exclusion of all causes and diseases that may result in sinus tachycardia. In particular, it is important to differentiate postural orthostatic tachycardia syndrome (POTS), and a multidisciplinary approach is necessary for differentiating psychiatric events. In addition, whether the clinical symptoms coincide with tachycardia events should be checked before treatment. β-adrenergic blocker is the most effective drug, and exercise training is recommended for controlling clinical symptoms. Furthermore, discontinuation of smoking and alcohol consumption, and decrease in caffeine intake may be useful. Recently, ivabradine has been found effective, and catheter ablation can be considered in cases of drug refractory IST presenting with clinical symptoms.
Alcohol Drinking ; Arrhythmias, Cardiac ; Caffeine ; Catheter Ablation ; Postural Orthostatic Tachycardia Syndrome ; Smoke ; Smoking ; Tachycardia ; Tachycardia, Sinus*

Tachycardia rarely consists of an ictal symptomatology associated with autonomic symptoms such as sialorrhea, even if it commonly precedes or combines with a limbic aura of complex partial seizure. A 14-year-old boy with recurrent palpitation, chest discomfort, and sialorrhea suffered from a pure autonomic seizure presenting as sinus tachycardia with a neural origin, which had been misdiagnosed as paroxysmal supraventricular tachycardia without improvement by cardiac medication. The right mesial temporal origin was revealed by video CCTV-EEG with the profile of the heart rate during ictus.
Adolescent ; Epilepsy ; Heart Rate ; Humans ; Male ; Seizures* ; Sialorrhea ; Tachycardia ; Tachycardia, Sinus* ; Tachycardia, Supraventricular ; Temporal Lobe ; Thorax

Pacemaker-mediated tachycardia(PMT) is a circus movement tachycardia that can occur in patients with dual chamber pacemaker with atrial sensing(VDD or DDD), when a ventricular depolarization, either spontaneous or paced, causes retrograde activation of the atrium. Recently, a number of pacemaker manufactures have incorporated in their devices a variety of relatively complex algorithms to prevent PMT. Despite these measures, PMT may still occur because of inappropriate programming or unpredictable variations of ventriculoatrial conduction. We report one case of PMT in a 78-year-old male who received DDD type pacemaker due to sick sinus syndrome. In this case, PMT was disappeared after reprogramming parameters of pacemaker and the application of PMT protection algorithm.
Aged ; Dichlorodiphenyldichloroethane ; Humans ; Male ; Sick Sinus Syndrome ; Tachycardia*

Electrocardiograms were observed in 168 patients with typhoid fever and were analyzed according to the duration of illness and hemoglobin level. The following results were obtained. 1) 124 patients out of 168 patients showed abnormal electrocardiographic findings. 2) The most prevalent abnormal findings were observed during third to fourth week of illness. 3) The lower the hemoglobin level, the higher frequency of electrocardiographic abnormalities were found. 4) Among the electrocardiographic disorders, sinus tachycardia was the most common finding and it was found in 60 cases(35.7%). The major abnormalities were ST-T change, low QRS voltage, prolongation of Q-T interval and prolongation of P-R interval: the over all incidence of these were 26.8%, 15.5%, 13.7% and 9.55 respectively. In addition to the major abnormalities, incomplete right bundle branch block (5.4%), premature ventricular contractions(3.0%) and abnormal Q wave(1.2%) were observed.
Bundle-Branch Block ; Electrocardiography* ; Humans ; Incidence ; Tachycardia, Sinus ; Typhoid Fever*

Sinus tachycardia is an accelerated rhythm in which the rate of impulses arising from the sinoatrial node is elevated. Uncontrolled sinus tachycardia may result in a poor prognosis, particularly in patients with cardiovascular disease, because of a hemodynamic disturbance arising from the tachycardia itself. When sinus tachycardia is specifically triggered by anemia, shock, or fever, it is referred to as physiological sinus tachycardia. Physiological sinus tachycardia should resolve with correction of the underlying cause. Inappropriate sinus tachycardia (IST) is unexplained by physiological demand. Palpitation is the most frequent symptom in IST patients. Even though treatment of IST has insufficient efficacy and a relatively high recurrence rate, several treatment strategies such as use of a β-blocker, ivabradine, and radiofrequency catheter ablation can be used for IST patients.
Anemia ; Arrhythmia, Sinus ; Cardiovascular Diseases ; Catheter Ablation ; Fever ; Hemodynamics ; Humans ; Prognosis ; Recurrence ; Shock ; Sinoatrial Node ; Tachycardia* ; Tachycardia, Sinus

Permanent junctional reciprocating tachycardia (PJRT) is an infrequent form of reentrant supraventricular tachycardia. This tachycardia usually occurs in children and young adults and may be associated with tachycardiainduced cardiomyopathy. It is virtually incessant, at a rate ranging from 120 to 250 beats/minute. The characteristic electrocardiogram shows inverted P waves in the inferior leads with a long RP interval (RP greater than PR) during tachycardia. During tachycardia, the cardiac impulse conducts antegradely through the atrioventricular node and His-Purkinje system, returning retrogradely through the slowly conducting accessory pathway. The location of the accessory pathway is usually, but not always, near the ostium of the coronary sinus. Since the advent of radiofrequency catheter ablation (RFCA), several reports have emphasized the usefulness of RFCA for the treatment of PJRT. We report a case of PJRT in a 33-year-old male, successfully treated with RFCA.
Adult ; Atrioventricular Node ; Cardiomyopathies ; Catheter Ablation* ; Child ; Coronary Sinus ; Electrocardiography ; Humans ; Male ; Tachycardia ; Tachycardia, Reciprocating* ; Tachycardia, Supraventricular ; Young Adult

Williams syndrome is a progressive and multisystemic disorder. We experienced one case of Willams syndrome which was characterized by elfin facies, mental retardation, diffuse aortic hypoplasia, mitral regurgitation and chronic nonparoxysmal sinus tachycardia. The tachycardia has been managing with beta-blocker successfully. We presented a case of unusual form of Williams syndrome with a reivew of literatures.
Facies ; Intellectual Disability ; Mitral Valve Insufficiency ; Tachycardia ; Tachycardia, Sinus ; Williams Syndrome*

Adolescent ; Atrial Appendage ; Diagnostic Errors ; Female ; Humans ; Tachycardia, Ectopic Atrial ; diagnosis ; Tachycardia, Sinus ; diagnosis

Supraventricular tachycardia (SVT) refers to a heterogeneous group of arrhythmias localized within the upper part of the heart (the His bundle or above). In general, the term SVT does not include atrial fibrillation. Common forms of SVT include atrioventricular nodal reentrant tachycardia, atrioventricular reentrant tachycardia, focal atrial tachycardia, and atrial flutter. Other, less common arrhythmias also fall under the category of SVT, including inappropriate sinus tachycardia and junctional reentrant/ectopic tachycardia. Paroxysmal supraventricular tachycardia refers to AVNRT and AVRT. SVTs can be identified and classified by clinical manifestation/physical examination, ECG, and/or electrophysiologic analysis.
Arrhythmias, Cardiac ; Atrial Fibrillation ; Atrial Flutter ; Bundle of His ; Diagnosis, Differential* ; Electrocardiography ; Heart ; Tachycardia ; Tachycardia, Atrioventricular Nodal Reentry ; Tachycardia, Sinus ; Tachycardia, Supraventricular*