The majority of hearts in which selective right or left atrial angiography shows no direct communication between one atrium and a ventricular chamber are considered to be examples of atresia of the right or left atrioventricular valves. Most patients presenting with the clinical features of tricuspid atresia have an absent right ...

Three cases of twins conjoined across the chest were examined. In one set, one twin showed right atrial isomerism and the other showed the usual atrial arrangement. The other two sets showed the usual atrial arrangement in both twins. The associated cardiac anomalies were diverse, ranging from atrioventricular septal defects to absent ...

We retrospectively studied the experience of our institution with isolated dysplasia of one or both atrio-ventricular valves in 22 newborn infants. All patients with associated cardiac malformations were excluded. Ten patients exhibited isolated tricuspid valve dysplasia. One patient had tricuspid valve dysplasia and a dysplastic pulmonary valve. In 10 patients, both ...

ObjectivesTo determine the characteristic morphological features of hearts with concordant ventriculoarterial connections and parallel arterial trunks, and to provide unequivocally a method to describe their anatomy.Design, methods and patientsThe entire cardiac database and cardiac pathological archive at the Hospital for Sick Children, Toronto, Ontario, Canada, was ...

Management of the ventricular septal defect at the time of the double switch operation can be challenging and deserves careful attention to the anatomic details of ventricular septal defect location, alignment with the appropriate subtended ventricles and their respective atrioventricular valves, and the disposition of the specialized conduction tissue. These anatomic details ...

This study was undertaken to evaluate the nature and pathogenesis of malformations of the atrioventricular canal in relation to normal cardiogenesis. Serial histologic sections of normal human embryos and fetuses were made, from which three-dimensional images were reconstructed to show the relationship between the developing heart and its surrounding structures, and the course ...

We describe a case of a preterm newborn with congenital complete atrioventricular block (CAVB), delivered for distress by cesarean section, and undergone, at 1295 grams of weight, to permanent pacemaker implantation. The pacemaker has been inserted between the upper left rectus abdominal muscle and the posterior rectus sheath and connected by two ...

We describe 76 patients in whom a double inlet atrioventricular connexion was guarded by a common atrioventricular valve. The atriums were connected to a dominant right ventricle in 42, to a left ventricle in 29 and to a solitary indeterminate ventricle in 5. The most common atrial arrangement was isomerism of the right atrial ...

Right atrial isomerism or left atrial isomerism is frequently diagnosed as situs ambiguous without further discrimination of the specific morbid anatomy. Thirty six cases of right atrial isomerism and seven cases of left atrial isomerism were collected from the records and pathological museum at the National Taiwan University Hospital. There was a necropsy report for 18 cases. In all patients one ...

A partial anomalous pulmonary venous connection (PAPVC) associated with partial atrioventricular septal defect (AVSD) is a rare combination. A 51-year-old man who experienced dyspnea on exertion was found to have a PAPVC with the middle portion of the superior vena cava and a comorbid partial AVSD. A patch diversion was successfully performed using an ...

The purpose of this study was to report 18 cases of criss-cross heart and to evaluate the utility of magnetic resonance imaging (MRI) for the determination of atrioventricular segmental situs and atrioventricular alignment in patients with criss-cross heart. From August 1999 to March 2007, 18 consecutive patients with criss-cross heart were studied using a ...

When inhalational induction is indicated, sevoflurane is the most popular choice in both children and adults. Higher inspired concentrations of sevoflurane can cause adverse cardiac arrhythmias that are seen to disappear once the agent is discontinued. We report the occurrence of isorhythmic atrioventricular dissociation and junctional rhythm with absent P ...

The sinus node generates the electrical impulse, which spreads rapidly over both atria, causing them to contract simultaneously. In the normal heart, a layer of connective tissue electrically insulates the atria and ventricles. The only pathway that crosses this plane is the atrioventricular conduction axis, through which the impulse reaches the ...

... with L1 syndrome can also have difficulty speaking (aphasia), seizures, and underdeveloped or absent tissue connecting the ...

On the basis of our collective experience we have reviewed the disposition of the cardiac conduction tissues as they might be observed by the surgeon in both normal and abnormal hearts. The sinus node lies subepicardially in the terminal sulcus; because of its variable blood supply the entire superior cavoatrial junction is a potential danger area. There are no morphologically discrete tracts ...

Nov 30, 2010 ... Demonstrating the fact (often connected with a Galileo hypothesis) that, absent air resistance, objects will accelerate toward the ground at ...

of the heart (ventricular septal defect) Correcting a blood vessel that connects the aorta of the heart to the pulmonary artery (ductus arteriosis) Enlarging the flow from the...

Fetal cardiac anatomy was studied by ultrasound in 96 pregnancies between 16 and 24 weeks' gestation. Sequential approach was used to identify all venous, atrioventricular and ventriculoarterial connections as well as intracardiac anatomy. A standard CSE was performed after birth in all patients to confirm the normal heart anatomy. Aortic arch, pulmonary ...

The purpose of this study was to quantitate the uncertainty inherent in the electrophysiologic mapping of ventricular preexcitation as seen in Wolff-Parkinson-White syndrome. An ink-coated needle electrode was constructed to serve as a point source of unipolar stimulation along the atrioventricular junction. Activation times for 11 ventricular mapping sites at the ...

A 52-year-old woman presented with left ventricular (LV) dysfunction and incessant narrow complex tachycardia. Electrocardiogram and clinical picture were suggestive of a permanent form of junctional reciprocating tachycardia, but electrophysiology study showed the tachycardia to be a fast-slow form of atrioventricular nodal reentrant tachycardia (AVNRT). Slow pathway ablation ...

We report that the dominant human missense mutations G303E and G296S in GATA4, a cardiac-specific transcription factor gene, cause atrioventricular septal defects and valve abnormalities by disrupting a signaling cascade involved in endocardial cushion development. These GATA4 missense mutations, but not a mutation causing secundum atrial septal defects (S52F), demonstrated ...

We report that the dominant human missense mutations G303E and G296S in GATA4, a cardiac-specific transcription factor gene, cause atrioventricular septal defects and valve abnormalities by disrupting a signaling cascade involved in endocardial cushion development. These GATA4 missense mutations, but not a mutation causing secundum atrial septal defects (S52F), demonstrated ...

A 7-month-old boy with heterotaxy syndrome had partial atrioventricular septal defect and interrupted inferior vena cava with hemiazygos continuation to a left superior vena cava. The left side of the common atrium receiving all the venous drainage was in connection with the left ventricle and the aorta. The small atrium and the proximity of the pulmonary ...

The results are reported of a study of 83 necropsied hearts with atresia of the right atrioventricular orifice. It is emphasised that right atrial or atrioventricular orificial atresia is a better term to describe this anomaly than "tricuspid atresia". Use of the latter term can be confusing when the morphologically tricuspid valve is located beneath the ...

SummaryIn this study, we examined the tissue-specific expression of two electroneutral Na/HCO₃ cotransporter (NBCn1) variants that differ from each other by the presence of the N-terminal 123 amino acids (cassette II). A rat Northern blot with the probe to nucleotides encoding cassette II detected a 9 kb NBCn1 mRNA strongly in the heart and weakly in skeletal muscles, but ...

Defects originating from the atrioventricular canal region are part of a wide spectrum of congenital cardiovascular malformations that frequently affect newborns. These defects include partial or complete atrioventricular septal defects, atrioventricular valve defects, and arrhythmias, such as atrioventricular ...

A 63 year old man with complete atrioventricular block was diagnosed as having Fabry's disease. A short PR interval is a common electrocardiographic finding in Fabry's disease, but complete atrioventricular block is a very rare complication. Necropsy indicated that lipid accumulation in the atrioventricular conduction system was the ...

Dual atrioventricular nodal physiology has been reported. Atrioventricular nodal reentrant tachycardia is the most common supraventricular tachycardia associated with dual atrioventricular nodal physiology. We present a case of dual atrioventricular nodal physiology in a 12-year-old Italian boy. PMID:19135745

... a spacious coelom consisting of dorsal and ventral sinuses with expansive connections between each at urosome ganglia, ... absent. Coelom spacious, consisting of dorsal and ventral sinuses with expansive ...

... vector tissue absent. Ventral, dorsal, and lateral coelomic sinuses present, with intersegmental connections between dorsal and lateral sinuses. External morphology (based on 44 individuals fixed in ......

Until recently the method of solution of inverse problems for continuous media were limited to the particular case where the velocity varies with depth and a horizontal gradient is absent. In connection with the development of seismic surveying for ore, a...

...postoperative scars, absent or poorly functioning parts or organs, will not be considered service connected unless the disease...aggravated by service. (2) Due regard will be given the places, types, and circumstances of service and particular...

By means of a complex technique some structural and blood supply peculiarities of the valve apparatus have been studied in 118 hearts of 8 representatives of domestic (Anser domesticus, Anas domestica) and wild (Cygnus olor, Cygnus sygnus, Chenopsis atrata, Anser anser, Anas platyrhynchos, Anas strepera) waterfowls. The investigations have demonstrated that in all the waterfowl studied the right ...

The atrioventricular (AV) node allows ante- and retrograde conduction between atria and ventricles. It is commonly assumed that these AV nodal conduction properties go hand in hand. However, ante- and retrograde AV conduction can be completely independent from each other in individual patients. We report about a patient with permanent AV block III degrees requiring ...

We present a technology for the accurate and fast geo-location of medical data and the creation of central data archives, specifically designed for the development of disease risk maps and of other functions for modern epidemiology and surveillance. A WEBGIS system is configured as an Internet web service integrated with connectivity to a Geographical Information System (GIS). ...

In patients with pre-excitation, a short PR interval and a delta wave are not always clearly seen, particularly if the pre-excitation is mild. Absent septal Q waves have been used as additional evidence suggestive of pre-excitation. The purpose of the present study was to determine the incidence of normalization of septal Q waves after successful ablation of a manifest ...

There is a wide spectrum of changes in the resting electrocardiograms of athletes. We here present a case of third-degree atrioventricular block in an asymptomatic young athlete. PMID:2026992

We present a case of atrioventricular node reentrant tachycardia that displays spontaneously alternating antegrade and retrograde conduction via 1:2 manners. PMID:21410718

AVNRT; AtrioVentricular Nodal Reentrant Tachycardia; SVT; Supraventricular Tachycardia; Heart Disease

... Cells in the sinus node pacemaker, atrial wall, atrioventricular node, atrioventricular bundle, false tendons, and ventricular wall were impaled with ...

... rhythm (arrhythmia) called an atrioventricular (AV) block. P waves show that the top of the heart received electrical activity. Each P wave is usually followed by the tall (QRS) waves. ...

This report presents 2 cases of atrioventricular junctional rhythm with Wenckebach phenomenon, one was nonparoxysmal junctional tachycardia with both retrograde and antegrade Wenckebach phenomenon and the other paroxysmal junctional tachycardia with anteg...

Atrioventricular canal defect Basics In-Depth Multimedia Resources Definition Symptoms Causes Risk factors Complications Preparing for your appointment Tests and diagnosis ...

The purpose of this study was to determine the effects of resting vagal tone on accessory atrioventricular (AV) connections. Atropine (0.04 mg/kg) was administered to 13 patients with the Wolff-Parkinson-White syndrome and was found to have the following effects on the accessory AV connection: the anterograde block cycle length ...

BACKGROUND--Reentrant tachycardias associated with Mahaim pathways are rare but potentially troublesome. Various electrophysiological substrates have been postulated and catheter ablation at several sites has been described. OBJECTIVE--To assess the efficacy and feasibility of targeting discrete Mahaim potentials recorded on the tricuspid annulus for the delivery of radiofrequency energy in the ...

Cardiac rhythm abnormalities, including ventricular arrhythmia, atrial fibrillation and atrioventricular block, have been observed during the acute stage of dengue haemorrhagic fever. Atrioventricular or complete heart block can be fatal and may require a temporary pacemaker. We report a ten-year-old girl who presented with dengue haemorrhagic fever with ...