PACES/HRS Expert Consensus Statement on the Recognition and
... Bradyarrhythmias may involve disorders of the sinus node, AV node, His–Purkinje system, or intra-atrial propagation. It has been estimated that approximately 50% of 20-year-olds with CHD will develop an atrial tachyarrhythmia during their lifetime.26 Table 3.1 summarizes atrial tachyarrhythmias typi ...
... Bradyarrhythmias may involve disorders of the sinus node, AV node, His–Purkinje system, or intra-atrial propagation. It has been estimated that approximately 50% of 20-year-olds with CHD will develop an atrial tachyarrhythmia during their lifetime.26 Table 3.1 summarizes atrial tachyarrhythmias typi ...
PACES/HRS Expert Consensus Statement on the Recognition and
... Bradyarrhythmias may involve disorders of the sinus node, AV node, His–Purkinje system, or intra-atrial propagation. It has been estimated that approximately 50% of 20-year-olds with CHD will develop an atrial tachyarrhythmia during their lifetime.26 Table 3.1 summarizes atrial tachyarrhythmias typi ...
... Bradyarrhythmias may involve disorders of the sinus node, AV node, His–Purkinje system, or intra-atrial propagation. It has been estimated that approximately 50% of 20-year-olds with CHD will develop an atrial tachyarrhythmia during their lifetime.26 Table 3.1 summarizes atrial tachyarrhythmias typi ...
Characterization of Atrial Repolarization Alternans and
... of interest had an elusive nature. This thesis describes the physiological motivation for this study, introduces the signal processing techniques developed to remove interferences and extract the parameters of interest, and proposes an interpretation of the results obtained. The present thesis is ai ...
... of interest had an elusive nature. This thesis describes the physiological motivation for this study, introduces the signal processing techniques developed to remove interferences and extract the parameters of interest, and proposes an interpretation of the results obtained. The present thesis is ai ...
Hemodynamic Monitoring in the CCU
... – Mitral regurgitation begins with the onset of ventricular systole (marked by the C wave in the PAOP waveform) and continues until the end of systole (marked by the peak of the V wave in the PAOP waveform). – The hallmark of acute mitral regurgitation is a giant “C-V” wave in the wedge pressure tra ...
... – Mitral regurgitation begins with the onset of ventricular systole (marked by the C wave in the PAOP waveform) and continues until the end of systole (marked by the peak of the V wave in the PAOP waveform). – The hallmark of acute mitral regurgitation is a giant “C-V” wave in the wedge pressure tra ...
Diagnosis and ablation of atypical atrial tachycardia and flutter
... successfully ablated with a single application of radiofrequency energy. In a series of 116 macroreentrant atrial tachycardias that started several days to weeks after circumferential pulmonary vein ablation for paroxysmal or persistent atrial fibrillation, the most common type was a perimitral tach ...
... successfully ablated with a single application of radiofrequency energy. In a series of 116 macroreentrant atrial tachycardias that started several days to weeks after circumferential pulmonary vein ablation for paroxysmal or persistent atrial fibrillation, the most common type was a perimitral tach ...
Hemodynamic Monitoring in the CCU
... – Mitral regurgitation begins with the onset of ventricular systole (marked by the C wave in the PAOP waveform) and continues until the end of systole (marked by the peak of the V wave in the PAOP waveform). – The hallmark of acute mitral regurgitation is a giant “C-V” wave in the wedge pressure tra ...
... – Mitral regurgitation begins with the onset of ventricular systole (marked by the C wave in the PAOP waveform) and continues until the end of systole (marked by the peak of the V wave in the PAOP waveform). – The hallmark of acute mitral regurgitation is a giant “C-V” wave in the wedge pressure tra ...
Haemodynamic evaluation of the first trimester fetus with special
... from the extremities); (iv) negative intrathoracic pressure during ‘inspiration’ (breathing-like movements have been recognized in fetuses as early as 11 weeks gestation); (v) peripheral resistance or afterload (in the fetus the placental circulation is located between the arterial and the venous sy ...
... from the extremities); (iv) negative intrathoracic pressure during ‘inspiration’ (breathing-like movements have been recognized in fetuses as early as 11 weeks gestation); (v) peripheral resistance or afterload (in the fetus the placental circulation is located between the arterial and the venous sy ...
Surgery for Atrial Fibrillation: Selecting the Procedure for the
... beats originating in the pulmonary veins15 has redirected the focus of interest to the pulmonary veins as the main target. Some years before the development of the Maze IV procedure, Queirós and colleagues developed a strategy aiming to surgically isolate only the pulmonary veins by means of radiofr ...
... beats originating in the pulmonary veins15 has redirected the focus of interest to the pulmonary veins as the main target. Some years before the development of the Maze IV procedure, Queirós and colleagues developed a strategy aiming to surgically isolate only the pulmonary veins by means of radiofr ...
Right ventricular reserve in a piglet model of chronic pulmonary hypertension
... 15–20 mL·kg−1 and a pulmonary end-expiratory pressure of 5 cmH2O (Servo 900; Siemens-Elema AB, Solna, Sweden). Inspired oxygen fraction was adjusted to obtain stable peripheral oxygen saturation up to 95% during all procedures. 13 2-month-old Large White piglets underwent a ligation of the left pulm ...
... 15–20 mL·kg−1 and a pulmonary end-expiratory pressure of 5 cmH2O (Servo 900; Siemens-Elema AB, Solna, Sweden). Inspired oxygen fraction was adjusted to obtain stable peripheral oxygen saturation up to 95% during all procedures. 13 2-month-old Large White piglets underwent a ligation of the left pulm ...
Recommendations for Cardiac Chamber Quantification by
... most echocardiographic parameters. However, this approach is fundamentally flawed. First, not all echocardiographic parameters are normally distributed (or Gaussian), even in a normal population. Second, even if a particular parameter is normally distributed in normal subjects, most echocardiographi ...
... most echocardiographic parameters. However, this approach is fundamentally flawed. First, not all echocardiographic parameters are normally distributed (or Gaussian), even in a normal population. Second, even if a particular parameter is normally distributed in normal subjects, most echocardiographi ...
ACCF/ASE/ACEP/ASNC/SCAI/SCCT/SCMR 2007 Appropriateness
... In an effort to respond to the need for the rational use of imaging services in the delivery of high quality care, the American College of Cardiology Foundation (ACCF) has undertaken a process to determine the appropriateness of cardiovascular imaging for selected patient indications. Appropriatenes ...
... In an effort to respond to the need for the rational use of imaging services in the delivery of high quality care, the American College of Cardiology Foundation (ACCF) has undertaken a process to determine the appropriateness of cardiovascular imaging for selected patient indications. Appropriatenes ...
Comprehensive assessment of biventricular function and aortic
... The elastic properties of the aorta were indexed by calculation29 – 31 of aortic distensibility (D), stiffness index (SI), and pressure– strain elastic modulus (Ep) as D ¼ 2(As – Ad)/[Ad (Ps 2 Pd)], SI ¼ ln(Ps / Pd) / (As – Ad)/Ad, and Ep ¼ (Ps – Pd)/[(As 2 Ad)/ Ad], respectively, where As, aortic d ...
... The elastic properties of the aorta were indexed by calculation29 – 31 of aortic distensibility (D), stiffness index (SI), and pressure– strain elastic modulus (Ep) as D ¼ 2(As – Ad)/[Ad (Ps 2 Pd)], SI ¼ ln(Ps / Pd) / (As – Ad)/Ad, and Ep ¼ (Ps – Pd)/[(As 2 Ad)/ Ad], respectively, where As, aortic d ...
Comprehensive assessment of biventricular function and aortic
... Introduction The haemodynamic load caused by long-term training involves both cardiac ventricular chambers, inducing an increase in ventricular diameters, wall thickness, and mass. These changes are usually described as ‘athlete’s heart’.1 – 3 Adaptations to exercise are dependent on the specific ty ...
... Introduction The haemodynamic load caused by long-term training involves both cardiac ventricular chambers, inducing an increase in ventricular diameters, wall thickness, and mass. These changes are usually described as ‘athlete’s heart’.1 – 3 Adaptations to exercise are dependent on the specific ty ...
Congenital Heart Defects – A Review
... great vessels which occurs during intrauterine development, irrespective of the age at presentation. Ventricular septal defect and coarctation of the aorta are typical examples of CHDs. In this chapter, a brief review of incidence, etiology and classification of CHD, and an overview of the most comm ...
... great vessels which occurs during intrauterine development, irrespective of the age at presentation. Ventricular septal defect and coarctation of the aorta are typical examples of CHDs. In this chapter, a brief review of incidence, etiology and classification of CHD, and an overview of the most comm ...
The Anatomy and Function of the Semilunar Valves
... dictates the transition from the aortic root into the ascending aorta. The semilunar hinges then cross another defined “ring” known as the anatomic ventriculoarterial junction. This overall anatomic arrangement is described previously in Fig. 2.5, but can be readily observed when the aortic root is o ...
... dictates the transition from the aortic root into the ascending aorta. The semilunar hinges then cross another defined “ring” known as the anatomic ventriculoarterial junction. This overall anatomic arrangement is described previously in Fig. 2.5, but can be readily observed when the aortic root is o ...
Heart rate variability decreases with age - Core
... In Table 4, the age-related decrease in HRV for male subjects was greater and more rapid than that for female subjects (all measures). Using SDNN, SDANN and the SDNN index, HRV for male subjects began to decrease significantly before age 30. Using SDNN and SDANN, HRV for female subjects exhibited a ...
... In Table 4, the age-related decrease in HRV for male subjects was greater and more rapid than that for female subjects (all measures). Using SDNN, SDANN and the SDNN index, HRV for male subjects began to decrease significantly before age 30. Using SDNN and SDANN, HRV for female subjects exhibited a ...
Müllerleile, Cathrin Theis, Karsten Bock, Helge Servatius, Arian
... to indicate a statistically significant difference. On the basis of our clinical experience, we assumed a P value of 0.05 for α error and a P value of 0.15 for β error (β−1=0.85). With an expected rate of the arrhythmia-free survival of 0.6 (group B) and 0.3 (group A), we calculated a sample size of ...
... to indicate a statistically significant difference. On the basis of our clinical experience, we assumed a P value of 0.05 for α error and a P value of 0.15 for β error (β−1=0.85). With an expected rate of the arrhythmia-free survival of 0.6 (group B) and 0.3 (group A), we calculated a sample size of ...
Three-dimensional residual strain in midanterior canine left ventricle
... Fig. 1. Schematic diagram of method for defining structurally based coordinate systems used to study 3dimensional (3-D) residual strain. A: isolated heart in its intact unloaded state showing 5 surface markers used to define cardiac coordinates (x1, x2, x3 ) aligned with local circumferential (x1 ), ...
... Fig. 1. Schematic diagram of method for defining structurally based coordinate systems used to study 3dimensional (3-D) residual strain. A: isolated heart in its intact unloaded state showing 5 surface markers used to define cardiac coordinates (x1, x2, x3 ) aligned with local circumferential (x1 ), ...
Cardiac diastolic function and hypercapnic ventilatory responses in central sleep apnoea
... out-of-phase chest and abdominal movements, or snoring. A mixed apnoea was defined as absence of oronasal airflow associated with central followed by obstructive components. The apnoea/hypopnoea index (AHI) was defined as the total number of apnoeas and hypopnoeas divided by the total sleep time, an ...
... out-of-phase chest and abdominal movements, or snoring. A mixed apnoea was defined as absence of oronasal airflow associated with central followed by obstructive components. The apnoea/hypopnoea index (AHI) was defined as the total number of apnoeas and hypopnoeas divided by the total sleep time, an ...
Serum Magnesium in Patients with Acute Myocardial Infarction
... infarction, in comparison to healthy adult (control group). In this study, serum magnesium was estimated in clinically diagnosed case of acute myocardial infarction and healthy adult of both sexes and different age group as the control group. Maximum numbers of patients with myocardial infarction we ...
... infarction, in comparison to healthy adult (control group). In this study, serum magnesium was estimated in clinically diagnosed case of acute myocardial infarction and healthy adult of both sexes and different age group as the control group. Maximum numbers of patients with myocardial infarction we ...
Comparison of estimations versus measured resting oxygen
... reduction in the heart’s ability to circulate blood. Cardiac output during right heart catheterization is an important variable used in patient selection for advanced therapies, such as cardiac transplantation and left ventricular assist device implantation. It is common practice to utilize the Fick ...
... reduction in the heart’s ability to circulate blood. Cardiac output during right heart catheterization is an important variable used in patient selection for advanced therapies, such as cardiac transplantation and left ventricular assist device implantation. It is common practice to utilize the Fick ...
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.