Biomedical subjects

Lluís Mont

Publications and source records attributed to Lluís Mont.

22 records · Page 2Linked to original sources

PubMed2002

Inappropriate tachycardia detection by a biventricular implantable cardioverter defibrillator.

This case describes "double counting" of intrinsic conduction due to the combination of intraventricular conduction delay and the merging of the electrograms from the right and left ventricle (coronary sinus) leads in a biventricular cardioverter defibrillator. This situation prompted asymptomatic antitachycardia pacing. Lengthening of AV conduction by betablocker solved the problem.

Adrenergic beta-Antagonists↗

PubMed2002

Accessory pathway localization by QRS polarity in children with Wolff-Parkinson-White syndrome.

INTRODUCTIONS: Location of the accessory pathway (AP) in Wolff-Parkinson-White (WPW) syndrome can be determined accurately by the QRS polarity on resting ECG. These ECG characteristics may be different in children, and no algorithm has yet been tested. METHODS AND RESULTS: A total of 153 resting ECGs of symptomatic children with WPW syndrome were retrospectively analyzed. The anatomic AP location had been established fluoroscopically at eight possible sites during radiofrequency catheter ablation. Two independent observers predicted AP location on blinded ECGs with a QRS polarity algorithm for adults using leads II, III, aVL, V1, and V2. Subsequently, the QRS polarity for all individual ECG leads was evaluated and a new algorithm for children was devised. With the adult algorithm, the observers correctly predicted only 55% to 58% of AP locations. The septal and right-sided pathways often were inseparable, and mid-septal and parahisian pathways were missed. In the new children's algorithm, left lateral, left posteroseptal, and posteroseptal pathways shared a positive or intermediate QRS polarity on V1, with the left lateral pathway separated by a positive QRS polarity on lead III. Negative QRS polarity on lead V1 and positive QRS polarity on lead V3 were shared by right posteroseptal, mid-septal, parahisian, and anteroseptal pathways, with the latter two having a positive QRS polarity on lead aVF. Right lateral pathways had negative QRS polarity on lead V1 and negative or intermediate QRS polarity on lead V3. Overall accuracy for these five regions was 90%. CONCLUSION: AP characterization by QRS polarity in children with WPW syndrome is more diverse than in adults and requires other ECG leads to establish five AP regions.

Adolescent↗

PubMedDate not supplied

[Radiofrequency ablation of late ventricular tachycardia in patients with corrected Tetralogy of Fallot].

We present the cases of two patients with surgical repaired Tetralogy of Fallot and late ventricular tachycardia. In one patient, the ventricular tachycardia had a right bundle branch block pattern, and in the other, a left bundle branch block pattern. In both patients a macroreentrant circuit in the right ventricular outflow tract was documented; radiofrequency ablation was effective in both cases. This suggests that the morphology of the ventricular tachycardia in these patients could depend of the direction of the circuit into the right ventricular outflow tract and that mapping of this zone allows to localize the appropriate site for effective ablation.

Adult↗

PubMedDate not supplied

[Current concepts on sudden death].

Sudden death is defined as the death occurring less than one hour before the onset of the patient's symptoms. It is a severe condition considered a public health issue in several countries and in ours, it accounts for 33 000 to 53 000 annual deaths mainly related to ischemic heart disease. The main cause of sudden death are severe ventricular arrhythmias, but determining what patients are at risk for such an episode is complex, that is why risk stratification is usually a low cost-effective intervention. In the present study, we describe different sudden death risk-stratification strategies. Different sudden death treatment strategies regarding general population have different success rates in different countries, nevertheless, among select high risk populations; the best therapy currently available is the automatic implantable cardioverter-defibrillator. We also discuss other treatment options. In Mexico it is deemed necessary to do an important effort for the early detection, prevention and treatment of sudden death in order to limit the consequences of this problem.

Clinical Trials as Topic↗