Superior Vena Cava Syndrome
... collateral venous network has enough time to expand in order to receive the circulating volume. For this reason, long-lasting, severe SVC obstruction can sometimes be found without significant related signs and symptoms [3,6]. ...
... collateral venous network has enough time to expand in order to receive the circulating volume. For this reason, long-lasting, severe SVC obstruction can sometimes be found without significant related signs and symptoms [3,6]. ...
The Mechanism of Adaptation of Left Atrial Stretch Congestive Heart
... under warm mineral oil, and desheathed. Slips of the vagus were cut centrally and placed upon bipolar platinumiridium recording electrodes. The neural activity was appropriately amplified and the fiber continuously split until a recording was obtained from a single unit. Each receptor was identified ...
... under warm mineral oil, and desheathed. Slips of the vagus were cut centrally and placed upon bipolar platinumiridium recording electrodes. The neural activity was appropriately amplified and the fiber continuously split until a recording was obtained from a single unit. Each receptor was identified ...
Left atrial function: pathophysiology, echocardiographic assessment
... Starling mechanism is also operative in the LA. LA output increases as atrial diameter increases, which contributes to maintaining a normal stroke volume.w4 Moreover, LA contractile function might decrease in the presence of severe LA dilation when the optimal FrankeStarling relationship is exceeded ...
... Starling mechanism is also operative in the LA. LA output increases as atrial diameter increases, which contributes to maintaining a normal stroke volume.w4 Moreover, LA contractile function might decrease in the presence of severe LA dilation when the optimal FrankeStarling relationship is exceeded ...
the size of the left atrium in patients with paroxysmal atrial fibrillation
... are various and include: left ventricular hypertrophy, myocardial ischemia, left ventricle impaired function and left atrial enlargement. The aim of the study was to determine the size of the left atrium in paroxysmal atrial fibrillation and arterial hypertension patients. The investigation comprise ...
... are various and include: left ventricular hypertrophy, myocardial ischemia, left ventricle impaired function and left atrial enlargement. The aim of the study was to determine the size of the left atrium in paroxysmal atrial fibrillation and arterial hypertension patients. The investigation comprise ...
Impact of Atrioventricular Compliance on Pulmonary Artery Pressure
... Background—The decay of the pressure gradient across a stenotic mitral valve is determined by the size of the orifice and net AV compliance (Cn). We have observed a group of symptomatic patients, usually in sinus rhythm, characterized by pulmonary hypertension (particularly during exercise) despite ...
... Background—The decay of the pressure gradient across a stenotic mitral valve is determined by the size of the orifice and net AV compliance (Cn). We have observed a group of symptomatic patients, usually in sinus rhythm, characterized by pulmonary hypertension (particularly during exercise) despite ...
Chapter 20 Heart
... contraction – parasympathetic impulses decrease heart rate. – Baroreceptors (pressure receptors) detect change in BP and send info to the cardiovascular center • located in the arch of the aorta and carotid arteries ...
... contraction – parasympathetic impulses decrease heart rate. – Baroreceptors (pressure receptors) detect change in BP and send info to the cardiovascular center • located in the arch of the aorta and carotid arteries ...
Atrial Size Independently Correlates with the Development of
... cm2 increase in left atrial area corresponded to a 44% increase in risk for the development of paroxysmal AF. The risk for development of paroxysmal AF in SSS patients was 8.6-fold when the left atrial area was > 24.1 cm2. Thus, this study found that the left atrial size was a clinical determinant o ...
... cm2 increase in left atrial area corresponded to a 44% increase in risk for the development of paroxysmal AF. The risk for development of paroxysmal AF in SSS patients was 8.6-fold when the left atrial area was > 24.1 cm2. Thus, this study found that the left atrial size was a clinical determinant o ...
Beta‐Blocker Use Is Associated With Impaired Left Atrial Function in
... Methods and Results-—We studied 212 subjects with hypertension and without heart failure or atrial fibrillation. LA strain was measured from cine steady-state free-precession cardiac MRI images using feature-tracking algorithms. In multivariable models adjusted for age, sex, race, body mass index, bl ...
... Methods and Results-—We studied 212 subjects with hypertension and without heart failure or atrial fibrillation. LA strain was measured from cine steady-state free-precession cardiac MRI images using feature-tracking algorithms. In multivariable models adjusted for age, sex, race, body mass index, bl ...
Simulation of the Frank-Starling Law of the Heart
... and valve flows) if either preload or afterload was increased. The simulated data agreed qualitatively, and quantitatively when experimental data are available, with data obtained on amphibian or on mammalian myocardium. In addition, the data obtained in these simulations improve our understanding o ...
... and valve flows) if either preload or afterload was increased. The simulated data agreed qualitatively, and quantitatively when experimental data are available, with data obtained on amphibian or on mammalian myocardium. In addition, the data obtained in these simulations improve our understanding o ...
catheter ablation reimbursement guide
... procedures regarding the appropriate medical strategies to minimize risk when using contrast media. The CryoAblation (Arctic Front Advance and Freezor MAX) family of catheters were not studied for safety of changes in anticoagulation therapy in patients with atrial fibrillation. This equipment shoul ...
... procedures regarding the appropriate medical strategies to minimize risk when using contrast media. The CryoAblation (Arctic Front Advance and Freezor MAX) family of catheters were not studied for safety of changes in anticoagulation therapy in patients with atrial fibrillation. This equipment shoul ...
Normalization of the EKG in patients with right bundle branch block
... One day before admission she had an episode of near syncope without any prodromal complaints. She had history of hypertension with an irregular control to the out patient clinic. The oral medicine was amlodipine (Norvask) 5 mg daily. Risk factor for coronary artery disease was hypertension, menopaus ...
... One day before admission she had an episode of near syncope without any prodromal complaints. She had history of hypertension with an irregular control to the out patient clinic. The oral medicine was amlodipine (Norvask) 5 mg daily. Risk factor for coronary artery disease was hypertension, menopaus ...
Percutaneous Left-Atrial Appendage Closure Devices For Stroke
... Left Atrial Appendage Versus Warfarin Therapy for Prevention of Stroke in Patients with Atrial Fibrillation (PROTECT-AF) randomized controlled trial (RCT). The device underwent 3 panel reviews before it was approved by the FDA through the premarket approval (PMA) process on March 13, 2015.4 This dev ...
... Left Atrial Appendage Versus Warfarin Therapy for Prevention of Stroke in Patients with Atrial Fibrillation (PROTECT-AF) randomized controlled trial (RCT). The device underwent 3 panel reviews before it was approved by the FDA through the premarket approval (PMA) process on March 13, 2015.4 This dev ...
Role of Inflammation in Initiation and Perpetuation of Atrial
... Inflammation has emerged as being strongly associated with AF initiation and perpetuation, including being implicated as a possible causal factor. Its role needs further elucidation to assist with the optimal prevention and treatment of AF using an individualized strategy. In the present review arti ...
... Inflammation has emerged as being strongly associated with AF initiation and perpetuation, including being implicated as a possible causal factor. Its role needs further elucidation to assist with the optimal prevention and treatment of AF using an individualized strategy. In the present review arti ...
Paroxysmal Supraventricular Tachycardia
... 20-50 msec without changing the tachycardia. Some irregularity of cycle length should have been noted during the scanning interval. Furthermore, in the presence of premature capture of the low right atrium by as much as 100 msec (fig. 3B), it seems very unlikely that the impulse would not have alter ...
... 20-50 msec without changing the tachycardia. Some irregularity of cycle length should have been noted during the scanning interval. Furthermore, in the presence of premature capture of the low right atrium by as much as 100 msec (fig. 3B), it seems very unlikely that the impulse would not have alter ...
Dextrocardia with Situs Inversus, Atrio
... and situs inversus in 23% of the cases [4]. Another study reported dextrocardia to be associated with situs solitus in 64%, situs inversus in 27%, and situs ambiguous in 9% [2]. In our case report, the patient was incidentally found to have dextrocardia, situs inversus, concordant atrio-ventricular ...
... and situs inversus in 23% of the cases [4]. Another study reported dextrocardia to be associated with situs solitus in 64%, situs inversus in 27%, and situs ambiguous in 9% [2]. In our case report, the patient was incidentally found to have dextrocardia, situs inversus, concordant atrio-ventricular ...
Reoperation for Tricuspid Regurgitation after Total Correction of
... right ventricular outflow tract and branch pulmonary arteries.5,6) Reoperation for recurrent or residual intracardiac defects following initial correction of TOF yields excellent hemodynamic and functional results over both short- and long-term follow-up.7-9) Oechslin and coworkers7) reported no per ...
... right ventricular outflow tract and branch pulmonary arteries.5,6) Reoperation for recurrent or residual intracardiac defects following initial correction of TOF yields excellent hemodynamic and functional results over both short- and long-term follow-up.7-9) Oechslin and coworkers7) reported no per ...
WATCHMAN® Left Atrial Appendage Closure Device
... blood flow within the atria can be slower than normal. This change in blood flow may also cause blood clots to form. During atrial fibrillation, most blood clots that originate in the heart develop in the left atrial appendage, which is a pouch-like structure that is part of the left atrium. ...
... blood flow within the atria can be slower than normal. This change in blood flow may also cause blood clots to form. During atrial fibrillation, most blood clots that originate in the heart develop in the left atrial appendage, which is a pouch-like structure that is part of the left atrium. ...
Indications, Results and Mortality of Pulmonary Artery Banding
... pulmonary artery pressure. In patients with cardiac defects that produce left-to-right shunting, this restriction of PBF reduces the shunt volume and consequently improves both systemic pressure and cardiac output. A reduction of PBF also decreases the total blood volume returning to the left ventri ...
... pulmonary artery pressure. In patients with cardiac defects that produce left-to-right shunting, this restriction of PBF reduces the shunt volume and consequently improves both systemic pressure and cardiac output. A reduction of PBF also decreases the total blood volume returning to the left ventri ...
Atrial Arrhythmias After Single-Ring Isolation of the Posterior Left
... procedure were electrically cardioverted to restore sinus rhythm. The previously isolated region within the ring was mapped to identify where the earliest activation was entering the PLA or pulmonary veins as described above. These areas were ablated, and if ablation resulted in isolation of the PLA ...
... procedure were electrically cardioverted to restore sinus rhythm. The previously isolated region within the ring was mapped to identify where the earliest activation was entering the PLA or pulmonary veins as described above. These areas were ablated, and if ablation resulted in isolation of the PLA ...
New Insights into Mechanisms of Atrial Fibrillation
... The cardiac autonomic nervous system can be divided into extrinsic and intrinsic components (Ardell 1994). The extrinsic part consists of brain nuclei and chains of ganglia along the spinal cord with axons terminating in the heart. The intrinsic component is composed of a network formed of axons and ...
... The cardiac autonomic nervous system can be divided into extrinsic and intrinsic components (Ardell 1994). The extrinsic part consists of brain nuclei and chains of ganglia along the spinal cord with axons terminating in the heart. The intrinsic component is composed of a network formed of axons and ...
Using a human cardiovascular-respiratory model to characterize
... equalize to diastolic right atrial (RA) and right ventricular (RV) pressures, and at higher levels of effusion to diastolic left atrial (LA) and left ventricular (LV) pressures. Heightened pericardial pressure may lead to partial chamber collapse for a portion of the cardiac cycle [1,2] wherein PPER ...
... equalize to diastolic right atrial (RA) and right ventricular (RV) pressures, and at higher levels of effusion to diastolic left atrial (LA) and left ventricular (LV) pressures. Heightened pericardial pressure may lead to partial chamber collapse for a portion of the cardiac cycle [1,2] wherein PPER ...
8 Heart Murmurs Part II
... low-frequency diastolic murmur. The murmur will sound quite similar to the diastolic rumble of mitral stenosis and is best heard at the apex. This is called the Austin Flint murmur (4,22–26). That the Austin Flint murmur is a sign of severe aortic regurgitation can in fact be proven by improving for ...
... low-frequency diastolic murmur. The murmur will sound quite similar to the diastolic rumble of mitral stenosis and is best heard at the apex. This is called the Austin Flint murmur (4,22–26). That the Austin Flint murmur is a sign of severe aortic regurgitation can in fact be proven by improving for ...
Diagnosis and ablation of atypical atrial tachycardia and flutter
... veins, atrial tachycardias are unusual, occurring in only 1% to 2% of patients.1– 4 In contrast, when pulmonary vein isolation is achieved by a wide area ablation or when the left atrium is targeted directly with ablation lines or by ablation of complex, fractionated atrial electrograms, left atrial ...
... veins, atrial tachycardias are unusual, occurring in only 1% to 2% of patients.1– 4 In contrast, when pulmonary vein isolation is achieved by a wide area ablation or when the left atrium is targeted directly with ablation lines or by ablation of complex, fractionated atrial electrograms, left atrial ...
Congenital Aneurysms of the Aortic Sinuses with
... seen that tricular septal defect, but there right aortic sinus and the right went into complete heartblock treated with Isuprel with good arrest on his 19th post-operative of all defects. ...
... seen that tricular septal defect, but there right aortic sinus and the right went into complete heartblock treated with Isuprel with good arrest on his 19th post-operative of all defects. ...
X35129134
... and frequency domain features of ECG signals can be extracted using Digital Signal Processing (DSP) techniques and these help to detect cardiac abnormalities. It has been seen that if there is fibrillation present in the ECG then this is indicated by the presence of distinct peaks in the range of 3 ...
... and frequency domain features of ECG signals can be extracted using Digital Signal Processing (DSP) techniques and these help to detect cardiac abnormalities. It has been seen that if there is fibrillation present in the ECG then this is indicated by the presence of distinct peaks in the range of 3 ...
Atrial septal defect
Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Normally, the atria are separated by a dividing wall, the interatrial septum. If this septum is defective or absent, then oxygen-rich blood can flow directly from the left side of the heart to mix with the oxygen-poor blood in the right side of the heart, or vice versa. This can lead to lower-than-normal oxygen levels in the arterial blood that supplies the brain, organs, and tissues. However, an ASD may not produce noticeable signs or symptoms, especially if the defect is small.A ""shunt"" is the presence of a net flow of blood through the defect, either from left to right or right to left. The amount of shunting present, if any, determines the hemodynamic significance of the ASD. A ""right-to-left-shunt"" typically poses the more dangerous scenario.During development of the fetus, the interatrial septum develops to separate the left and right atria. However, a hole in the septum called the foramen ovale, allows blood from the right atrium to enter the left atrium during fetal development. This opening allows blood to bypass the nonfunctional fetal lungs while the fetus obtains its oxygen from the placenta. A layer of tissue called the septum primum acts as a valve over the foramen ovale during fetal development. After birth, the pressure in the right side of the heart drops as the lungs open and begin working, causing the foramen ovale to close entirely. In approximately 25% of adults, the foramen ovale does not entirely seal. In these cases, any elevation of the pressure in the pulmonary circulatory system (due to pulmonary hypertension, temporarily while coughing, etc.) can cause the foramen ovale to remain open. This is known as a patent foramen ovale (PFO), which is a type of atrial septal defect.