scholarly journals Electrophysiologic study in chronic Chagas' heart disease

1995 ◽  
Vol 113 (2) ◽  
pp. 841-850 ◽  
Author(s):  
Maurício Scanavacca ◽  
Eduardo Sosa
Keyword(s):  
Heart Disease ◽  
Cardiac Arrhythmias ◽  
Sinus Node ◽  
Atrioventricular Node ◽  
Invasive Procedure ◽  
Pharmacological Therapy ◽  
Diagnostic Methods ◽  
Electrophysiologic Study ◽  
Non Invasive ◽  
Chagas Heart Disease

Cardiac arrhythmias are common in chagasic patients. Electrophysiologic study is an invasive procedure for the investigation of sinus node function, atrioventricular node conduction and intraventricular (His-Purkinje) conduction and the mechanism of tachycardias. It is useful in elucidating syncope, dizziness and tachycardiac palpitations that remain unexplained by non-invasive diagnostic methods. It is fundamental in directing non-pharmacological therapy, especially in "sudden death" survivors. Chagasic patients may benefit from electrophysiologic study after a critical clinical evaluation.

Atrial premature beats

ESC CardioMed ◽  
2018 ◽  
pp. 2050-2052
Author(s):  
Tatjana Potpara
Keyword(s):  
Heart Disease ◽  
Sinus Node ◽  
Pulmonary Veins ◽  
Atrioventricular Node ◽  
Structural Heart Disease ◽  
Class Iii ◽  
P Waves ◽  
Asymptomatic Patients ◽  
Narrow Qrs Complex ◽  
Premature Beats

Atrial premature beats (APBs), also referred to as atrial or supraventricular extrasystoles, represent premature atrial depolarization occurring earlier than the next expected regular sinoatrial activation, usually from a site outside the sinus node. Premature depolarizations originating from the atrioventricular node or His bundle are termed atrioventricular junctional premature beats. In general, APBs occur in adults of any age, with or without structural heart disease. Increased atrial volume and/or pressure, or increased sympathetic tone are associated with increased frequency of APBs, while in individuals without structural heart disease APBs often originate from the pulmonary veins and may precipitate atrial fibrillation. Patients with APBs are often asymptomatic, or experience palpitations, dizziness, or even presyncope. Significant haemodynamic compromise due to APBs is uncommon. Physical examination may reveal pulse irregularity, and surface electrocardiograms (ECGs) usually show premature P waves which differ from the sinus P morphology, followed by a normal, shortened, or prolonged PR interval (depending on the APB site of origin) and narrow QRS complex. Ambulatory ECG (Holter) monitoring helps to establish the diagnosis when symptoms are sporadic or to quantify the frequency of APBs. Counselling and reassurance would suffice in most minimally symptomatic or asymptomatic patients with APBs, but any underlying cardiovascular disorder must be treated. Beta blockers or class III antiarrhythmic drugs (or class IC in patients without significant structural heart disease) can be used to attenuate symptoms or suppress the APBs facilitating other tachyarrhythmias. Catheter ablation could be considered in selected patients.

scholarly journals Cardiac Arrhythmias – Part III Narrow Complex Tachycardia

2005 ◽  
Vol 4 (2) ◽  
pp. 51-57
Author(s):  
DW Davies ◽  
◽  
MD O’Neill ◽  
Keyword(s):  
Atrial Fibrillation ◽  
Cardiac Arrhythmias ◽  
Sinus Tachycardia ◽  
Sinus Node ◽  
Atrioventricular Node ◽  
Supraventricular Arrhythmia ◽  
Common Causes ◽  
Atrioventricular Reciprocating Tachycardia ◽  
Narrow Complex Tachycardia ◽  
Wolff Parkinson White Syndrome

Narrow complex tachycardia usually refers to an abnormality of cardiac rhythm involving the tissues of the sinus node, atrial tissue, the atrioventricular node or an accessory atrioventricular communication. Although atrial fibrillation is the most common supraventricular arrhythmia, the term “supraventricular tachycardia” conventionally refers to the group of rhythm disturbances encompassing sinus tachycardia (appropriate and inappropriate), atrial tachycardia, atrial flutter, atrioventricular nodal reciprocating tachycardia (AVNRT) and atrioventricular reciprocating tachycardia (AVRT) including the Wolff Parkinson White syndrome (WPW). Atrial fibrillation is beyond the scope of this article which focuses on the diagnosis and acute management of the patient presenting with one of these common causes of a regular, narrow complex tachycardia.

scholarly journals Hypervagotonic binodal dysfunction in children. Features of the natural course

2015 ◽  
Vol 96 (4) ◽  
pp. 609-615
Author(s):  
E S Vasichkina ◽  
T K Kruchina ◽  
D S Lebedev ◽  
D F Egorov
Keyword(s):  
Atrioventricular Block ◽  
Clinical Course ◽  
Sinus Node ◽  
Atrioventricular Node ◽  
Heart Rhythm ◽  
Sinus Node Dysfunction ◽  
Electrophysiologic Study ◽  
Point Position ◽  
Conduction Disorders ◽  
Normal Heart Rate

Aim. To evaluate the clinical and electrophysiological picture of binodal disease in children, as well as studying the clinical course of this disease. Methods. To study the clinical and electrophysiological picture of autonomic binodal disease, 426 patients under 18 years old were examined; the average age was 15.35±2.43 years (3-17.9). Patient’s complaints, medical history were examined, ECG, 24-hour ECG, stress ECG (treadmill or bicycle test), echocardiography, transesophageal electrophysiologic study were performed. In the case of a combination with pathological signs of sinus node dysfunction and atrioventricular node conduction disorders with the normalization of all parameters after the atropine administration, hypervagotonic binodal dysfunction was diagnosed. To assess the clinical course of the disease, a group of 72 children was selected, who were monitored repeatedly. Mean follow-up duration was 33 months. Results. During the study period, sinus node dysfunction and atrioventricular blocks completely resolved in 14 (19.44%), seen as normal clinical picture with no complaints, normal heart rate, no signs of sinoatrial block or atrioventricular block, normalization of Wenckebach point position. Another 35 (48.62%) had only one node dysfunction resolved (either sinoatrial or atrioventricular - Wenckebach point position within the age normal values and/or atrioventricular block resolved). In 23 (31.94%) - deterioration of the sinus node and atrioventricular node dysfunction was observed. Conclusion. There are significant differences in the frequency characteristics of heart rhythm and electrophysiological parameters of sinus node function in children with a favorable clinical course of binodal disease and progressive course of the disease.

scholarly journals Magnetic resonance imaging in Chagas' heart disease

1995 ◽  
Vol 113 (2) ◽  
pp. 880-883 ◽  
Author(s):  
Roberto Kalil Filho ◽  
Cicero Piva de Albuquerque
Keyword(s):  
Magnetic Resonance Imaging ◽  
Heart Disease ◽  
Magnetic Resonance ◽  
Metabolic Status ◽  
Myocardial Tissue ◽  
Resonance Imaging ◽  
Promising Technique ◽  
Non Invasive ◽  
Chagas Heart Disease

Many important aspects of Chagas' heart disease can be successfully assessed using magnetic resonance imaging of the heart. It is possible to obtain with great detail the anatomic characterization of the cardiac chambers as well as important information of the functional or metabolic status of the heart. Magnetic resonance imaging after gadolinium infusion seems also a promising technique to obtain a better regional characterization of myocardial tissue, and may be important in the non-invasive diagnosis of active myocarditis in patients with Chagas' heart disease.

scholarly journals Cardiac Autonomic Control Mechanisms in the Pathogenesis of Chagas' Heart Disease

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Diego F. Dávila ◽  
Jose H. Donis ◽  
Gabriela Arata de Bellabarba ◽  
Vanesa Villarroel ◽  
Francisco Sanchez ◽  
...  
Keyword(s):  
Nervous System ◽  
Heart Disease ◽  
Autonomic Nervous System ◽  
Chagas Disease ◽  
Sinus Node ◽  
Myocardial Damage ◽  
Current Status ◽  
Control Mechanisms ◽  
Chagas Heart Disease ◽  
Adrenergic Blockers

Primary abnormalities of the autonomic nervous system had been postulated as the pathogenic mechanisms of myocardial damage, in patients with Chagas disease. However, recent investigations indicate that these abnormalities are secondary and amenable to treatment with beta-adrenergic blockers. Moreover, muscarinic cardiac autoantibodies appear to enhance parasympathetic activity on the sinus node. Therefore, the purpose of this paper is to analyze how knowledge on Chagas' disease evolved from being initially considered as a primary cardioneuromyopathy to the current status of a congestive cardiomyopathy of parasitic origin.

Electrophysiologic Study of the Conduction System in Normal Children

PEDIATRICS ◽  
1977 ◽  
Vol 60 (6) ◽  
pp. 858-863
Author(s):  
Nigel K. Roberts ◽  
Paul C. Gillette
Keyword(s):  
Recovery Time ◽  
Sinus Node ◽  
Atrioventricular Node ◽  
Conduction System ◽  
Cardiac Conduction ◽  
Purkinje Fiber ◽  
Normal Children ◽  
Electrophysiologic Study ◽  
His Bundle ◽  
The Mean

Values for cardiac conduction intervals obtained from normal children are reported so that the data will be available for comparison with patients who are suspected of having abnormalities. Sinus node recovery time correlated linearly with the resting PP interval. The mean intra-atnal conduction was considerably shorter in children (< 25 msec) than in adults (42 msec). The atrioventricular node had similar electrophysiologic properties in the child and adult. With aging, the His bundle to Purkinje fiber time increased significantly (P < .01).

scholarly journals Clinical predictors of inducible sustained ventricular tachycardia during electrophysiologic study in patients with chronic Chagas' heart disease

2015 ◽  
Vol 9 ◽  
pp. 85-88 ◽  
Author(s):  
Augusto Cardinalli-Neto ◽  
Adalberto M. Lorga-Filho ◽  
Elissandro F. Silva ◽  
Renata P. Lima ◽  
Eduardo Palmegiani ◽  
...  
Keyword(s):  
Heart Disease ◽  
Ventricular Tachycardia ◽  
Sustained Ventricular Tachycardia ◽  
Clinical Predictors ◽  
Electrophysiologic Study ◽  
Chagas Heart Disease

scholarly journals Heart ultrasound in COVID-19

2020 ◽  
Vol 26 (3) ◽  
pp. 270-276
Author(s):  
O. N. Dzhioeva ◽  
O. M. Drapkina
Keyword(s):  
Heart Disease ◽  
Cardiac Arrhythmias ◽  
Myocardial Injury ◽  
Cardiovascular Complications ◽  
Diagnostic Methods ◽  
Suspected Infection ◽  
Heart Damage ◽  
Acute Myocardial Injury ◽  
Diagnostic Role ◽  
Coronavirus Infection

Given the risk of cardiovascular complications in COVID-19, including exacerbation of pre-existing heart disease, acute myocardial injury, and drug-related cardiac arrhythmias, echocardiography (ECHO) is one of the main diagnostic methods for examining patients with suspected infection or confirmed disease. The article presents the main statements regarding transthoracic ECHO during a pandemic. The main issues related to the FOCUS ECHO are described, as it may play important diagnostic role in case of suspected myocarditis, which can be one of the manifestations of heart damage of coronavirus infection.

The Utility of Non-invasive Tests for Detection of Previous Proximal-vein Thrombosis

1995 ◽  
Vol 73 (04) ◽  
pp. 592-596 ◽  
Author(s):  
Sabina Villalta ◽  
Paolo Prandoni ◽  
Alberto Cogo ◽  
Paola Bagatella ◽  
Andrea Piccioli ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
Femoral Vein ◽  
Clinical Score ◽  
Diagnostic Methods ◽  
Popliteal Vein ◽  
Venous Reflux ◽  
Study Objective ◽  
Vein Thrombosis ◽  
Non Invasive ◽  
The Common

SummaryBackground. Despite the availability of several diagnostic methods for the detection of deep-vein thrombosis (DVT), the identification of previous episodes of DVT remains a diagnostic challenge.Study objective. To assess the reliability of a combination of a standardized clinical score with three non-invasive tests: compression ultrasonography (CUS), Doppler ultrasound (DUS), and photoplethysmography (PPG), in determining the presence or the absence of previous proximal DVT.Methods. One hundred consecutive unselected outpatients were identified, who had undergone contrast venography six to nine years previously because of the clinical suspicion of DVT (confirmed in 43). They were blindly reinvestigated by a panel of trained operators unaware of venography results. They underwent a clinical evaluation of the lower limb, by applying a standardized score to five symptoms and six signs (grading each item from 0 to 3); a PPG test to determine the venous refilling time; a DUS test to determine the venous reflux separately in the common femoral and the popliteal vein; and a CUS test to determine vein compressibility in the same regions.Results. An abnormal CUS test and/or the demonstration of venous reflux in the popliteal region and/or a high clinical score (≥ 8) identified twenty-four of the 43 (56%) DVT + patients with a specificity of 89%. The combination of normal CUS with the absence of venous reflux in both the common femoral and popliteal vein and a low clinical score excluded previous thrombosis in 45 (79%) of the 57 DVT- patients (negative predictive value, 78%). Abnormal venous reflux in the isolated common femoral vein did not reliably predict the presence or absence of previous DVT. However, this occurred in only 13 (13%) patients. The PPG determination of venous refilling time did not improve the results obtained with the other tests.Conclusions. The combination of a standardized clinical evaluation with the results of CUS and DUS can reliably diagnose or exclude previous proximal-vein thrombosis in almost 90% of patients with previous episodes of suspected DVT.

Diagnosis of helicobacter pylori infection: problems and prospects

2020 ◽  
pp. 54-59
Author(s):  
A. S. Molostova ◽  
N. S. Gladyshev ◽  
A. V. Svarval ◽  
R. S. Ferman ◽  
A. B. Karasyova ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Urease Activity ◽  
Diagnostic Methods ◽  
Study Group ◽  
Biochemical Method ◽  
Antimicrobial Drugs ◽  
Non Invasive ◽  
Number Of Patients ◽  
Pcr Method ◽  
Positive Results

(HP) infection was performed using invasive and non-invasive methods. The study group consisted of 95 patients with dyspepsia. HP infection was detected in 47 patients (49.4 %). The expediency of using a set of diagnostic methods for detecting HP (PCR, immunochromatographic, bacteriological and method for determining urease activity) is proved. Most often (100 %) in patients HP infection was detected in biopsies using the PCR method. Somewhat less frequently it was detected when examining biopsies with an invasive biochemical method (AMA RUT Reader) (82 %) and fecal immunochromatographic method (83 %). Despite the fact that helicobacteriosis was detected bacteriologically in a small number of patients (24 %), this method is of particular value, since it allows you to assess the sensitivity to antimicrobial drugs and probiotics, and does not give false positive results.

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