Vectorcardiographic evaluation of ventricular repolarization in
... cardiac death in humans. Ventricular repolarization (VR) is the most unstable phase in cardiac electrical activity and its regulation depends on the coordinated activity in multiple ion channels. Several physiological factors such as heart rate (HR), autonomic nervous system (ANS) activity, gender a ...
... cardiac death in humans. Ventricular repolarization (VR) is the most unstable phase in cardiac electrical activity and its regulation depends on the coordinated activity in multiple ion channels. Several physiological factors such as heart rate (HR), autonomic nervous system (ANS) activity, gender a ...
Exercise at the Extremes
... between physical activity and CVD (14–16), but none have proven causation because all such studies are observational. To date, there are no randomized clinical trials directly testing whether physical activity prevents CVD. Such a study would require an enormous sample size and study duration becaus ...
... between physical activity and CVD (14–16), but none have proven causation because all such studies are observational. To date, there are no randomized clinical trials directly testing whether physical activity prevents CVD. Such a study would require an enormous sample size and study duration becaus ...
Manganese Superoxide Dismutase: Guardian of the Heart
... Manganese superoxide dismutase (MnSOD) is an antioxidant enzyme located in the mitochondrial matrix and is responsible for protecting against the damaging effects of reactive oxygen species (ROS). Superoxide’s (O2.-) are the first oxidant produced by the metabolism of oxygen in the mitochondria of e ...
... Manganese superoxide dismutase (MnSOD) is an antioxidant enzyme located in the mitochondrial matrix and is responsible for protecting against the damaging effects of reactive oxygen species (ROS). Superoxide’s (O2.-) are the first oxidant produced by the metabolism of oxygen in the mitochondria of e ...
Premature Closure of the Mitral and Tricuspid Valves
... that when the ventricle reaches its capacity a rebound wave occurs and closes the mitral valve. The mechanisms causing PTC may differ from those causing PMC. The pericardium may play an important role in PTC since PTC was abolished or greatly reduced in one subject by a wide incision of the pericard ...
... that when the ventricle reaches its capacity a rebound wave occurs and closes the mitral valve. The mechanisms causing PTC may differ from those causing PMC. The pericardium may play an important role in PTC since PTC was abolished or greatly reduced in one subject by a wide incision of the pericard ...
Aortic valve sclerosis and cardiac calcification.
... an increased prevalence of severe obstructive coronary artery disease. It may serve as a useful echocardiographic marker for the presence of obstructive coronary artery disease, specially when associated with anginal symptoms. ...
... an increased prevalence of severe obstructive coronary artery disease. It may serve as a useful echocardiographic marker for the presence of obstructive coronary artery disease, specially when associated with anginal symptoms. ...
Role of ATP-Sensitive K` Channel on ECG ST Segment
... mg/kg sodium pentobarbital. Under artificial ventilation with room air supplemented with oxygen (3 to 5 L/min), the thorax was opened in the fifth intercostal space, the pericardium was opened, and a pericardial cradle was made to support the heart at an appropriate position. The sinus node was crus ...
... mg/kg sodium pentobarbital. Under artificial ventilation with room air supplemented with oxygen (3 to 5 L/min), the thorax was opened in the fifth intercostal space, the pericardium was opened, and a pericardial cradle was made to support the heart at an appropriate position. The sinus node was crus ...
The cardiovascular system of mammals
... understanding of their origin and their application. The basic model used for the cardiovascular system will be the same as employed earlier. However, instead of starting the discussion at the cardiac response level, the starting point will be the condition that blood pressure in mammals is independ ...
... understanding of their origin and their application. The basic model used for the cardiovascular system will be the same as employed earlier. However, instead of starting the discussion at the cardiac response level, the starting point will be the condition that blood pressure in mammals is independ ...
PDF - Circulation: Arrhythmia and Electrophysiology
... Mountain View, CA) was used to guide catheter positioning and monitor pulmonary venous flows (Figure 1C). The patient was placed under general anesthesia, using a propofol infusion, and was intubated for the procedure. A transbaffle puncture was performed, using fluoroscopy and contrast angiography ...
... Mountain View, CA) was used to guide catheter positioning and monitor pulmonary venous flows (Figure 1C). The patient was placed under general anesthesia, using a propofol infusion, and was intubated for the procedure. A transbaffle puncture was performed, using fluoroscopy and contrast angiography ...
Increased Efferent Cardiac Sympathetic Nerve Activity
... membranes for b1-AR and nitrocellulose for b2-AR Gs (guanine nucleotide binding protein stimulatory) and Gi (guanine nucleotide binding protein inhibitory regulatory), as described previously (34), which were subsequently probed with specific polyclonal antibodies against b1-AR (rabbit, 1:500 dilutio ...
... membranes for b1-AR and nitrocellulose for b2-AR Gs (guanine nucleotide binding protein stimulatory) and Gi (guanine nucleotide binding protein inhibitory regulatory), as described previously (34), which were subsequently probed with specific polyclonal antibodies against b1-AR (rabbit, 1:500 dilutio ...
The Fontan circulation: who controls cardiac output?
... Lévy et al. w46, 47x demonstrated abnormal histology with thickened distal pulmonary vessels in all patients with a Fontan circulation who had pulmonary pressures over 18 mmHg mean and in 51% of those with low pulmonary pressures; endothelin upregulation was identified in those with a failed circui ...
... Lévy et al. w46, 47x demonstrated abnormal histology with thickened distal pulmonary vessels in all patients with a Fontan circulation who had pulmonary pressures over 18 mmHg mean and in 51% of those with low pulmonary pressures; endothelin upregulation was identified in those with a failed circui ...
Cardiogenic Shock
... advances in treating this condition, nearly 50% of patients with cardiogenic shock still do not survive to hospital discharge. In a strict sense, cardiogenic shock develops as a result of the failure of the heart in its function as a pump, resulting in inadequate cardiac output. This failure is most ...
... advances in treating this condition, nearly 50% of patients with cardiogenic shock still do not survive to hospital discharge. In a strict sense, cardiogenic shock develops as a result of the failure of the heart in its function as a pump, resulting in inadequate cardiac output. This failure is most ...
Images and Case Reports in Arrhythmia and Electrophysiology
... as it was coaxial with the transseptal sheath and thus required minimal equipment adjustment in additional planes. We think that integration of 3D TEE with this transseptal technique can be applied as an alternative method of left atrial access in other situations such as deployment of the Watchman ...
... as it was coaxial with the transseptal sheath and thus required minimal equipment adjustment in additional planes. We think that integration of 3D TEE with this transseptal technique can be applied as an alternative method of left atrial access in other situations such as deployment of the Watchman ...
Aortic stenosis: Who should undergo surgery, transcatheter valve
... also be helpful when there is discordance between clinical findings and echocardiography. Reprinted from American College of Cardiology; American Heart Association Task Force on Practice Guidelines (Writing Committee to revise the 1998 guidelines for the management of patients with valvular heart di ...
... also be helpful when there is discordance between clinical findings and echocardiography. Reprinted from American College of Cardiology; American Heart Association Task Force on Practice Guidelines (Writing Committee to revise the 1998 guidelines for the management of patients with valvular heart di ...
USING BALLISTOCARDIOGRAPHY TO EVALUATE CARDIAC
... oxygen consumption, or VO2max, is a product of cardiac output (total amount of blood released from the left ventricle per minute) and arteriovenous oxygen difference (AVO2). VO2max can easily be tested and provides a measurement of both circulatory and respiratory capacity (Cunningham, Telford, & Sw ...
... oxygen consumption, or VO2max, is a product of cardiac output (total amount of blood released from the left ventricle per minute) and arteriovenous oxygen difference (AVO2). VO2max can easily be tested and provides a measurement of both circulatory and respiratory capacity (Cunningham, Telford, & Sw ...
ASE 2017 - ASE Scientific Sessions
... potentially unsuited for a lifetime as the systemic pumping chamber), arrhythmias, and a small but important prevalence of obstruction of the systemic and/or pulmonary venous pathways.14-17 In 1975, Jatene et al.18 performed the first successful ASO. Although not a true anatomical ‘‘correction,’’ th ...
... potentially unsuited for a lifetime as the systemic pumping chamber), arrhythmias, and a small but important prevalence of obstruction of the systemic and/or pulmonary venous pathways.14-17 In 1975, Jatene et al.18 performed the first successful ASO. Although not a true anatomical ‘‘correction,’’ th ...
The thesis
... resulting increasing in atrial pressures. These hydro-hemodynamic changes can lead to increases in systemic and pulmonary venous pressures, consequent tachycardia, reduced ejection fraction and can even reduce coronary blood flow 4. ...
... resulting increasing in atrial pressures. These hydro-hemodynamic changes can lead to increases in systemic and pulmonary venous pressures, consequent tachycardia, reduced ejection fraction and can even reduce coronary blood flow 4. ...
Slow and deep respiration suppresses steady
... muscle sympathetic nerve activity in patients with CHF (15, 37). However, it remains unclear whether slow and deep respiration suppresses steady-state MSNA in patients with the high sympathetic tone as in CHF. Respiratory influences on the neural activity have some time lag and vary depending on the ...
... muscle sympathetic nerve activity in patients with CHF (15, 37). However, it remains unclear whether slow and deep respiration suppresses steady-state MSNA in patients with the high sympathetic tone as in CHF. Respiratory influences on the neural activity have some time lag and vary depending on the ...
Electrocardiography - Frank`s Hospital Workshop
... pair is known as a lead. Each lead is said to look at the heart from a different angle. Different types of ECGs can be referred to by the number of leads that are recorded, for example 3-lead, 5-lead or 12-lead ECGs (sometimes simply "a 12-lead"). A 12-lead ECG is one in which 12 different electrica ...
... pair is known as a lead. Each lead is said to look at the heart from a different angle. Different types of ECGs can be referred to by the number of leads that are recorded, for example 3-lead, 5-lead or 12-lead ECGs (sometimes simply "a 12-lead"). A 12-lead ECG is one in which 12 different electrica ...
Integrative Physiology
... fibrotic lesions in the left ventricular outflow tract area; arrowheads, right ventricular wall lesions. *Left ventricular lumen, filled with blood (not perfused). Scale bar: 1 mm. B and C, Higher magnification views of the lesion shown in B/C box of panel A stained with trichrome (B) and H&E (C). A ...
... fibrotic lesions in the left ventricular outflow tract area; arrowheads, right ventricular wall lesions. *Left ventricular lumen, filled with blood (not perfused). Scale bar: 1 mm. B and C, Higher magnification views of the lesion shown in B/C box of panel A stained with trichrome (B) and H&E (C). A ...
Coronary Angioplasty in Australia 1999
... via the skin (percutaneously). The catheter is threaded through the circulation back towards the heart and into the coronary arteries to the area of the vessel obstruction. The balloon is then inflated to disrupt the plaque and restore a wider passage for blood flow. PTCA avoids the major trauma of ...
... via the skin (percutaneously). The catheter is threaded through the circulation back towards the heart and into the coronary arteries to the area of the vessel obstruction. The balloon is then inflated to disrupt the plaque and restore a wider passage for blood flow. PTCA avoids the major trauma of ...
Cardiology - Stiftung KinderHerz
... and RVEF were found in an adult population that included patients with congenital heart disease [10]. Eyskens et al. [11] showed elevated RV systolic velocities in patients with ASDs and dilated RVs before percutaneous closure of the defect, which normalized within 24 hours after closure. Quantitati ...
... and RVEF were found in an adult population that included patients with congenital heart disease [10]. Eyskens et al. [11] showed elevated RV systolic velocities in patients with ASDs and dilated RVs before percutaneous closure of the defect, which normalized within 24 hours after closure. Quantitati ...
Blood Flow Velocity for Transcatheter Aortic Valve Implantation
... system, including a hot wire anemometer, will be mounted on the tip of a standard nonsensorized catheter commonly used in clinical T.A.V.I. procedures; said catheter will also mount an electro-magnetic tracking sensor, so that its position can be tracked in real time and therefore used to localize t ...
... system, including a hot wire anemometer, will be mounted on the tip of a standard nonsensorized catheter commonly used in clinical T.A.V.I. procedures; said catheter will also mount an electro-magnetic tracking sensor, so that its position can be tracked in real time and therefore used to localize t ...
Reservoir and conduit function of right atrium: impact on - AJP
... have demonstrated that pathologically altered left atrial conduit-to-reservoir function is an important determinant of left heart function and can profoundly affect cardiac performance (2, 4, 14 –17, 30, 33, 34, 38), but studies examining right atrial (RA) reservoir and conduit function are limited. ...
... have demonstrated that pathologically altered left atrial conduit-to-reservoir function is an important determinant of left heart function and can profoundly affect cardiac performance (2, 4, 14 –17, 30, 33, 34, 38), but studies examining right atrial (RA) reservoir and conduit function are limited. ...
Is treating cardiac hypertrophy salutary or
... hypertrophy is initially compensatory, the continued presence of hypertrophy leads to dilated cardiomyopathy, heart failure, ischemic heart disease, and sudden death (22, 23). The LV diastolic and systolic dysfunction and subsequent development of congestive heart failure start from hypertrophic rem ...
... hypertrophy is initially compensatory, the continued presence of hypertrophy leads to dilated cardiomyopathy, heart failure, ischemic heart disease, and sudden death (22, 23). The LV diastolic and systolic dysfunction and subsequent development of congestive heart failure start from hypertrophic rem ...
Surendranath R. Veeram Reddy and Harinder R. Singh 2010;31;e1 DOI: 10.1542/pir.31-1-e1
... knees up to their abdomens after feeding, pallor, diaphoresis, and circulatory shock. These babies often are misdiagnosed as having colic. Children who have a history of cardiac surgery and heart transplantation also are susceptible to myocardial ischemia and may present with chest pain as the initi ...
... knees up to their abdomens after feeding, pallor, diaphoresis, and circulatory shock. These babies often are misdiagnosed as having colic. Children who have a history of cardiac surgery and heart transplantation also are susceptible to myocardial ischemia and may present with chest pain as the initi ...
Cardiac surgery
Cardiovascular (heart) surgery is surgery on the heart or great vessels performed by cardiac surgeons. Frequently, it is done to treat complications of ischemic heart disease (for example, coronary artery bypass grafting), correct congenital heart disease, or treat valvular heart disease from various causes including endocarditis, rheumatic heart disease and atherosclerosis. It also includes heart transplantation.