Print - Circulation Research
... study addresses the question of whether adenosine, produced in response to this stress, influences either the antigen-antibody-induced alterations in cardiac function or the release of histamine, which is known to be one of the important mediators of the anaphylactic reaction. Isolated hearts of pas ...
... study addresses the question of whether adenosine, produced in response to this stress, influences either the antigen-antibody-induced alterations in cardiac function or the release of histamine, which is known to be one of the important mediators of the anaphylactic reaction. Isolated hearts of pas ...
Systematic Review: Comparative Effectiveness of Radiofrequency
... achieved by delivering lesions immediately outside the ostia of the pulmonary veins or along a wider area in the left atrium encircling the veins. Additional lesion sets have been used to ablate nonpulmonary vein triggers of atrial fibrillation and to target atrial areas thought to be responsible fo ...
... achieved by delivering lesions immediately outside the ostia of the pulmonary veins or along a wider area in the left atrium encircling the veins. Additional lesion sets have been used to ablate nonpulmonary vein triggers of atrial fibrillation and to target atrial areas thought to be responsible fo ...
M elatonin: a novel protective agent against oxidative injury of the
... melatonin’s effects in this study were likely related to its antioxidant action, as a positive control Tan et al. [11] infused another free radical scavenger, i.e. vitamin C, in a separate group of hearts. At a concentration of 500 mM (i.e. up to 500 times the concentration of melatonin), ascorbate ...
... melatonin’s effects in this study were likely related to its antioxidant action, as a positive control Tan et al. [11] infused another free radical scavenger, i.e. vitamin C, in a separate group of hearts. At a concentration of 500 mM (i.e. up to 500 times the concentration of melatonin), ascorbate ...
Effectiveness of systematic screening for the detection of atrial
... One cluster randomised controlled trial met the inclusion criteria for this review. This study compared systematic screening (by invitation to have an electrocardiogram (ECG)) and opportunistic screening (pulse palpation during a general practitioner (GP) consultation for any reason followed by an E ...
... One cluster randomised controlled trial met the inclusion criteria for this review. This study compared systematic screening (by invitation to have an electrocardiogram (ECG)) and opportunistic screening (pulse palpation during a general practitioner (GP) consultation for any reason followed by an E ...
Factors Influencing Infarct Size Following
... The purpose of this study was the determination of whether hemodynamic and pharmacologic factors influence the extent and severity of myocardial necrosis produced by coronary occlusion. In 48 dogs, 10 to 14 epicardial leads were recorded on the anterior surface of the left ventricle in the distribut ...
... The purpose of this study was the determination of whether hemodynamic and pharmacologic factors influence the extent and severity of myocardial necrosis produced by coronary occlusion. In 48 dogs, 10 to 14 epicardial leads were recorded on the anterior surface of the left ventricle in the distribut ...
Cardiac Imaging: Part 2, Normal, Variant, and Anomalous
... the basal interventricular septum and the entire septum at the mid and apical levels. Like the RCA, the LAD artery is divided into three segments (Fig. 7). The proximal segment runs from the LAD origin to the origin of the first septal perforator. The middle segment runs from the first septal perfor ...
... the basal interventricular septum and the entire septum at the mid and apical levels. Like the RCA, the LAD artery is divided into three segments (Fig. 7). The proximal segment runs from the LAD origin to the origin of the first septal perforator. The middle segment runs from the first septal perfor ...
Professor Denis Noble CBE FRS FMedSci FRCP (Hon)
... Brown, R. H. and D. Noble (1972). "Effect of pH on ionic currents underlying pacemaker activity in cardiac Purkinje fibres." Journal of Physiology 224: 3839P. Hauswirth, O., D. Noble, et al. (1972). "The dependence of plateau currents in cardiac Purkinje fibres on the interval between action potenti ...
... Brown, R. H. and D. Noble (1972). "Effect of pH on ionic currents underlying pacemaker activity in cardiac Purkinje fibres." Journal of Physiology 224: 3839P. Hauswirth, O., D. Noble, et al. (1972). "The dependence of plateau currents in cardiac Purkinje fibres on the interval between action potenti ...
the operation and management of a case after left atrium
... and, after confirmation of the diagnosis by angiocardiography performed from the saphenous vein, six hours later on the same afternoon we immersed the patient in ice water for the second time and operated again, this time successfully. ...
... and, after confirmation of the diagnosis by angiocardiography performed from the saphenous vein, six hours later on the same afternoon we immersed the patient in ice water for the second time and operated again, this time successfully. ...
CHAPTER 28 Three-Dimensional Echocardiographic Guidance of
... puncture with a good safety record,10 real time 3D TEE provides distinct advantages that may enhance both the safety of the puncture procedure and the success of the subsequent percutaneous intervention in the left heart. Among the several modalities of 3D TEE, biplane and 3D zoom imaging are part ...
... puncture with a good safety record,10 real time 3D TEE provides distinct advantages that may enhance both the safety of the puncture procedure and the success of the subsequent percutaneous intervention in the left heart. Among the several modalities of 3D TEE, biplane and 3D zoom imaging are part ...
ACC/AHA Guidelines for the Management of Patients With Acute
... one randomized trial to another impose some limitation on the generalizability of their findings. Likewise, in its efforts to reconcile conflicting data, the committee emphasized the importance of properly characterizing the population under study. Not all patients diagnosed with AMI are alike. For ...
... one randomized trial to another impose some limitation on the generalizability of their findings. Likewise, in its efforts to reconcile conflicting data, the committee emphasized the importance of properly characterizing the population under study. Not all patients diagnosed with AMI are alike. For ...
EACVI position paper:multimodality imaging in pericardial disease
... Transthoracic Doppler echocardiography is considered as the firstline imaging modality in almost all types of pericardial diseases because it is simple and quick to perform, widely available and safe.2 However, two-dimensional (2D) echocardiography has several weaknesses, mainly related to its depen ...
... Transthoracic Doppler echocardiography is considered as the firstline imaging modality in almost all types of pericardial diseases because it is simple and quick to perform, widely available and safe.2 However, two-dimensional (2D) echocardiography has several weaknesses, mainly related to its depen ...
i Screening and monitoring of stress using biofeedback equipment by
... Biofeedback equipment is intended to train conscious regulation of normally subconscious processes like autonomic nervous system activities. The manufacturers claim that measurements made with the equipment are accurate enough for research purposes, but these claims have not been vigorously tested. ...
... Biofeedback equipment is intended to train conscious regulation of normally subconscious processes like autonomic nervous system activities. The manufacturers claim that measurements made with the equipment are accurate enough for research purposes, but these claims have not been vigorously tested. ...
for Cardiopulmonary Resuscitation and Emergency Cardiovascular
... Kleinman et al Part 5: Adult BLS and CPR S415 potential cardiac arrest by dispatchers, with immediate provision of CPR instructions to the caller. • This Guidelines Update takes into consideration the ubiquitous presence of mobile phones that can allow the rescuer to activate the emergency res ...
... Kleinman et al Part 5: Adult BLS and CPR S415 potential cardiac arrest by dispatchers, with immediate provision of CPR instructions to the caller. • This Guidelines Update takes into consideration the ubiquitous presence of mobile phones that can allow the rescuer to activate the emergency res ...
PDF - Circulation
... After a minimum ventricular fibrillation of 10 seconds, defibrillation was attempted. The defibrillation threshold was determined as follows. The initial defibrillation setting was at a stored voltage of 300 V, which corresponded to an estimated energy delivery of approximately 3 J. Subsequent shock ...
... After a minimum ventricular fibrillation of 10 seconds, defibrillation was attempted. The defibrillation threshold was determined as follows. The initial defibrillation setting was at a stored voltage of 300 V, which corresponded to an estimated energy delivery of approximately 3 J. Subsequent shock ...
Coronary computed tomography angiography: a new wave of
... heart rhythm, coronary CTA in patients with markedly irregular heart rhythm, such as atrial fibrillation or frequent premature complexes, may not produce a good image quality. It is more certainly so if coronary CTA is performed using MDCT scanners that require a few rotations to ‘stitch’ up cardiac ...
... heart rhythm, coronary CTA in patients with markedly irregular heart rhythm, such as atrial fibrillation or frequent premature complexes, may not produce a good image quality. It is more certainly so if coronary CTA is performed using MDCT scanners that require a few rotations to ‘stitch’ up cardiac ...
Pulmonary regurgitation in congenital heart disease
... futher compromised by cardiomegaly predominantly occuring in the left chest (35). Previously reported restrictive lung defects in Tetralogy patients, may also be caused by cardiomegaly (36, 37). Although pulmonary regurgitant fraction is often used in clinical MRI reports and published papers as an ...
... futher compromised by cardiomegaly predominantly occuring in the left chest (35). Previously reported restrictive lung defects in Tetralogy patients, may also be caused by cardiomegaly (36, 37). Although pulmonary regurgitant fraction is often used in clinical MRI reports and published papers as an ...
Prognosis of Adults With Borderline Left Ventricular Ejection Fraction
... From the aDepartment of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts; bBoston University’s and National Heart, Lung, and Blood Institute’s Framingham Heart Study, Framingham, Massachusetts; cDepartment of Mathematics and St ...
... From the aDepartment of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts; bBoston University’s and National Heart, Lung, and Blood Institute’s Framingham Heart Study, Framingham, Massachusetts; cDepartment of Mathematics and St ...
atrial fibrillation
... mortality and improve quality of life but despite the therapeutic options in use, atrial fibrillation is still widespread and it is a significant public health problem. Current information on the public health burden of atrial fibrillation, pathogenesis of the arrhythmia, risk factors that cause atr ...
... mortality and improve quality of life but despite the therapeutic options in use, atrial fibrillation is still widespread and it is a significant public health problem. Current information on the public health burden of atrial fibrillation, pathogenesis of the arrhythmia, risk factors that cause atr ...
2014 AHA/ACC/HRS Guideline for the Management of - GT
... 1.2. Organization of the Writing Committee ....................................................................................................................... 9 1.3. Document Review and Approval ..................................................................................................... ...
... 1.2. Organization of the Writing Committee ....................................................................................................................... 9 1.3. Document Review and Approval ..................................................................................................... ...
2014 AHA/ACC/HRS Guideline for the Management of - Med-IQ
... CM, Yancy CW, 2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation, Journal of the American College of Cardiology (2014), doi: 10.1016/j.jacc.2014.03.022. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers ...
... CM, Yancy CW, 2014 AHA/ACC/HRS Guideline for the Management of Patients With Atrial Fibrillation, Journal of the American College of Cardiology (2014), doi: 10.1016/j.jacc.2014.03.022. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers ...
Pacing mode selection in patients with sick sinus syndrome
... received the assigned pacemaker and lead(s). Another way to perform clinical trials in pacing mode selection is to use software randomisation, where all patients receive “universal” DDD pacemakers, which afterwards are programmed to the randomised pacing mode (47). Using software randomisation, it i ...
... received the assigned pacemaker and lead(s). Another way to perform clinical trials in pacing mode selection is to use software randomisation, where all patients receive “universal” DDD pacemakers, which afterwards are programmed to the randomised pacing mode (47). Using software randomisation, it i ...
Coronary Artery Anomalies on CT Angiography
... indirect signs (such as systolic compression) can also be seen using retrospectively-gated coronary CT through different phases of the cardiac cycle. This capability of CT may explain the higher prevalence of myocardial bridging reported on CT (26%) compared to conventional angiography (0.5% to 4.5% ...
... indirect signs (such as systolic compression) can also be seen using retrospectively-gated coronary CT through different phases of the cardiac cycle. This capability of CT may explain the higher prevalence of myocardial bridging reported on CT (26%) compared to conventional angiography (0.5% to 4.5% ...
Accepted Manuscript
... 1.2. Organization of the Writing Committee ....................................................................................................................... 9 1.3. Document Review and Approval ..................................................................................................... ...
... 1.2. Organization of the Writing Committee ....................................................................................................................... 9 1.3. Document Review and Approval ..................................................................................................... ...
Carrent issues of the aortic functional morphology
... point out aortic paraganglia. According to William J. Crause paraganglia are located in some vascular areas: the point of branching off of the left subclavian artery and the corner between the right common carotid artery and the right subclavian artery. Christopher Edwards and Donald Heath (1960) d ...
... point out aortic paraganglia. According to William J. Crause paraganglia are located in some vascular areas: the point of branching off of the left subclavian artery and the corner between the right common carotid artery and the right subclavian artery. Christopher Edwards and Donald Heath (1960) d ...
Electrocardiography
Electrocardiography (ECG or EKG*) is the process of recording the electrical activity of the heart over a period of time using electrodes placed on a patient's body. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle depolarizing during each heartbeat.In a conventional 12 lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles (""leads"") and is recorded over a period of time (usually 10 seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle. The graph of voltage versus time produced by this noninvasive medical procedure is referred to as an electrocardiogram (abbreviated ECG or EKG).During each heartbeat, a healthy heart will have an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads out through the atrium, passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of cardiac drugs, and the function of implanted pacemakers.