Filter by keywords:



Filtering documents. Please wait...

11/49. Radiofrequency ablation of symptomatic but benign ventricular arrhythmias.

    Two cases are presented where ablation of severely symptomatic ventricular arrhythmias not responding to medical therapy was accomplished with radiofrequency current application. After a routine programmed stimulation protocol, a quadripolar ablation catheter with a 4-mm tip was advanced percutaneously into the left ventricle in one case and into the right ventricle in the second case; and after precise pace mapping, the arrhythmogenic focus was successfully ablated using radiofrequency current. The postablation ambulatory recording revealed virtual eradication of ventricular ectopy in both cases. In conclusion, in severely symptomatic cases of "benign" ventricular arrhythmias, radiofrequency ablation offers an effective therapeutic alternative.
- - - - - - - - - -
ranking = 1
keywords = frequency
(Clic here for more details about this article)

12/49. Interpretation of cardiac pathophysiology from pressure waveform analysis: cardiac arrhythmias.

    Various arrhythmias can produce distorted pressure waveforms, which may be confused with benign physiologic events. Delay in the management of serious arrhythmias can be avoided by vigilant monitoring of systemic pressures.
- - - - - - - - - -
ranking = 124.0241695855
keywords = wave
(Clic here for more details about this article)

13/49. Improvement of ventricular arrhythmia by octreotide treatment in acromegalic cardiomyopathy.

    We report a case of acromegalic cardiomyopathy in a 46-year-old Japanese man with pituitary adenoma. Increased secretion of growth hormone and insulin-like growth factor I were detected. He had left ventricular hypertrophy, impaired cardiac function, and frequent ventricular premature complexes. After 2-month treatment with octreotide, a long-acting somatostatin analogue, levels of both hormones were decreased. At the same time, left ventricular hypertrophy (intraventricular septal thickness: 22.5 to 17.8 mm), cardiac function (ejection fraction: 38 to 50%), and frequency of ventricular premature complexes (17,249 to 2,882 beats a day) were improved. Transsphenoidal surgery was then safely performed. Treatment with octreotide is thought to have some effect on improvement of ventricular arrhythmia in acromegalic heart.
- - - - - - - - - -
ranking = 0.14285714285714
keywords = frequency
(Clic here for more details about this article)

14/49. Spontaneous onset of ventricular fibrillation in brugada syndrome with J wave and ST-segment elevation in the inferior leads.

    We report the case of a 52-year-old man with variant brugada syndrome who was successfully resuscitated from ventricular fibrillation (VF). Resting ECG showed J wave and ST-segment elevation in the inferior leads but no coved or saddleback ST-segment elevation in the right precordial leads. Pilsicainide infusion provoked coved-type ST-segment elevation in the right precordial leads and mild ST-segment elevation 80 ms after the J point in the inferior leads. During an emergency, 12-lead ECG showed that spontaneous onset of VF was preceded by left bundle branch block and superior axis-type ventricular extrasystoles. The present case provides additional information on the site of origin of VF in patients with brugada syndrome.
- - - - - - - - - -
ranking = 124.0241695855
keywords = wave
(Clic here for more details about this article)

15/49. Holter electrocardiogram monitoring in nephrotic patients during methylprednisolone pulse therapy.

    We assessed the effect of intravenous methylprednisolone pulse therapy (IMPT) on cardiac rhythm and electrolyte metabolism in patients with nephrotic syndrome. A total of 25 patients had valid evaluations with continuous ambulatory electrocardiograms, and 20 of these had simultaneous sodium and potassium clearances. No significant difference of frequency in complex ventricular arrhythmias (Lown's grades 3-5) between the control and the therapy period was observed; however, 4 patients showed complex ventricular arrhythmias including ventricular tachycardia (2 patients) during the course of therapy. Fractional excretion of potassium and serum potassium significantly increased from baseline after IMPT. Complex ventricular arrhythmias, sometimes leading to sudden death, might ensue from IMPT. These dysrhythmias may be related to an abrupt change in potassium reflux from the cell.
- - - - - - - - - -
ranking = 0.14285714285714
keywords = frequency
(Clic here for more details about this article)

16/49. Sinus parasystole.

    Sinus parasystole is the expression of a protected nondominant sinus pacemaker, which is totally independent of the dominant rhythm. Two forms of sinus parasystole are described: (1) an active form, where both the dominant and the parasystolic pacemakers are located within the sinus node and (2) a passive form, where the basic rhythm is ectopic and the sinus pacemaker is protected as a result of complete retrograde SA block. Three cases of sinus parasystole are analyzed. In the active form of the arrhythmia the parasystolic sinus P waves are identical to those of the basic sinus rhythm. The diagnosis is suggested by variably coupled premature sinus P waves occurring with mathematically related intervals. This relationship between the parasystolic intervals can not be precise whenever complicating factors such as modulation occur. The recognition of active sinus parasystole is difficult, since the parasystolic P waves do not differ from basic P waves, so that the pattern resembles that of sinus arrhythmia or sinus extrasystoles. The passive form of sinus parasystole is more easily recognized due to the clear-cut difference between the dominant ectopic atrial waves and the "parasystolic" sinus P waves, which manifest with variable coupling intervals and reflect mathematically related intervals in between.
- - - - - - - - - -
ranking = 148.82900350261
keywords = wave
(Clic here for more details about this article)

17/49. Double atrial parasystole showing intermittent trigeminy.

    Atrial parasystole arising from two different ectopic atrial foci, namely, double atrial parasystole, showed intermittent trigeminy due to 3:1 exit block, in which both the ectopic atrial rates were around the sinus rate. Atrial trigeminy showing positive P waves in leads II and III continued, then intermittent atrial parasystole with negative P waves in leads II and III took over. The double atrial parasystole was considered to be interspersed with reentrant atrial beats. Other possible mechanisms to cause a disruptive influence on the trigeminy of the atrial parasystole with positive P waves in leads II and III are: (a) concealed intraatrial reentry with resetting by the sinus impulse; and (b) delayed capture by the impulse of the third preceding sinus beat, and the subsequent 3:1 exit block. On the other hand, the atrial parasystole with negative P waves in leads II and III tended to show long interectopic intervals, in which some of the parasystolic beats exhibited a coupling to the third preceding sinus beat. This suggested prompt resetting by the sinus impulse and the ensuing 3:1 exit block.
- - - - - - - - - -
ranking = 99.219335668404
keywords = wave
(Clic here for more details about this article)

18/49. Two cases of bi-ventricular dysplasia associated with ventricular tachycardia and familial occurrence of sudden death.

    Two strikingly similar patients with arrhythmogenic right ventricular dysplasia which severely impaired not only the right ventricle but also the left ventricle are described in association with familial occurrence of sudden death. A 49-year-old man experienced syncope which was due to ventricular tachycardia. electrocardiography revealed a first degree atrioventricular block, incomplete right bundle-branch block, T wave inversions in leads II, III, a VF and V1 to V5, and multiformal ventricular extrasystoles. echocardiography and ventricular cineangiography showed not only the right ventricular dilatation with an aneurysm in the right ventricular apex, inflow and outflow tracts, but also mild dilatation of the left ventricle with left ventricular apical and posterior aneurysms. radionuclide angiography also disclosed dysfunction of both ventricles, especially during exercise. His family history revealed that 3 members of his family died of sudden deaths. A 56-year-old woman experienced syncope secondary to ventricular tachycardia, with left bundle-branch block. electrocardiography showed complete right bundle-branch block, left axis deviation, and T wave inversions in leads V1 to V4. echocardiography and ventricular cineangiography revealed not only marked right ventricular dilatation with the "triangle of dysplasia", but also a left ventricular aneurysm in the apex and posterior portion. Her elder brother died of a sudden death, and electrocardiograms of 2 members of her family showed ventricular extrasystoles and T wave inversions. These 2 cases may well be termed "familial bi-ventricular dysplasia".
- - - - - - - - - -
ranking = 74.414501751303
keywords = wave
(Clic here for more details about this article)

19/49. Differential diagnosis of rhythm disturbances induced by endocardial pacing.

    Rhythm disturbances induced by endocardial pacing were studied in 15 patients. Atrial extrasystoles were found in 8, ventricular extrasystoles in 5, ventricular tachycardia in 1 and ventricular fibrillation in 1 patient. In all cases, an implanted pacemaker EKS-222 was used working in VVI regime. The connection of the above-mentioned rhythm disturbances with pacing is deduced from the stability of the coupling interval with the earlier induced complex, and from the presence of a negative P wave in standard leads II and III. A reliable criterion is in the authors' view, the disappearance of rhythm disturbances after the implanted pacemaker has been switched off.
- - - - - - - - - -
ranking = 24.804833917101
keywords = wave
(Clic here for more details about this article)

20/49. Paroxysmal supraventricular tachycardia initiated by a swallowing-induced premature atrial beat.

    We report a unique patient in whom electrophysiologic studies elucidated the mechanism of a rare form of swallowing-induced atrioventricular reentrant tachycardia, and for whom successful surgical ablation of an accessory pathway abolished intractable episodes of palpitation. A 64-year-old man was incapacitated by frequent attacks of palpitation following swallowing. Electrocardiograms documented paroxysmal supraventricular tachycardias initiated by a premature atrial beat or beats following swallowing. During electrophysiologic studies swallowing consistently induced premature atrial beats which in turn initiated a sustained atrioventricular reentrant tachycardia incorporating a retrogradely conducting left-sided concealed accessory pathway. The atrial activation sequence related to the premature atrial beats and the morphology of the premature P waves suggested that premature atrial beats originated in the right atrium. The mechanism of induction of premature atrial beats following swallowing remains obscure in our patient. Antiarrythmic drugs failed to prevent induction of sustained tachycardias during sequential electrophysiologic studies. The patient underwent successful surgical ablation of the accessory pathway and is free from palpitation 15 months after the surgery.
- - - - - - - - - -
ranking = 24.804833917101
keywords = wave
(Clic here for more details about this article)
<- Previous || Next ->


Leave a message about 'Cardiac Complexes, Premature'


We do not evaluate or guarantee the accuracy of any content in this site. Click here for the full disclaimer.