Atrial Fibrillation in Children
... examination of messenger ribonucleic acid (mRNA) from human hearts show that sinoatrial and atrioventricular nodal cells have increased expression of hyperpolarization-activated cyclic nucleotide-gated channels, HCN4, (controlling If current) and decreased expression of Kir channel genes, especially ...
... examination of messenger ribonucleic acid (mRNA) from human hearts show that sinoatrial and atrioventricular nodal cells have increased expression of hyperpolarization-activated cyclic nucleotide-gated channels, HCN4, (controlling If current) and decreased expression of Kir channel genes, especially ...
Experimental Auricular Flutter
... injury between superior and inferior vena cava. In these latter experiments the administration of lanatoside C or g-strophanthin produced results similar to those seen in the denervated hearts. The number of experiments is not sufficient to allow any conclusions concerning the establishment of quant ...
... injury between superior and inferior vena cava. In these latter experiments the administration of lanatoside C or g-strophanthin produced results similar to those seen in the denervated hearts. The number of experiments is not sufficient to allow any conclusions concerning the establishment of quant ...
Surgical Treatment of Atrial Fibrillation Through Isolation of the Left
... this context, atrial fibrillation of a rheumatic nature continues to be an extremely important clinical problem. In patients with mitral valve disease and atrial fibrillation, surgical correction of valvular dysfunction does not usually result in a solution for arrhythmia, because the indices of rec ...
... this context, atrial fibrillation of a rheumatic nature continues to be an extremely important clinical problem. In patients with mitral valve disease and atrial fibrillation, surgical correction of valvular dysfunction does not usually result in a solution for arrhythmia, because the indices of rec ...
Atrial Size Independently Correlates with the Development of
... moderate or severe valve stenosis or regurgitation, valve repair or replacement, congenital heart disease, baseline abnormal ventricular wall motion related to ischemia, dilated cardiomyopathy and history of a previous myocardial infarction. Hence, the study population comprised 144 patients. The SS ...
... moderate or severe valve stenosis or regurgitation, valve repair or replacement, congenital heart disease, baseline abnormal ventricular wall motion related to ischemia, dilated cardiomyopathy and history of a previous myocardial infarction. Hence, the study population comprised 144 patients. The SS ...
Left Ventricular Assist Device as Destination Therapy
... Selecting the best candidates for LVAD DT involves optimizing the balance between patients who are “too sick” and patients who are “too well”. Extensive prognostic data is available from INTERMACS, the unique registry of LVAD recipients in the USA which is sponsored by the National Heart, Lung, and ...
... Selecting the best candidates for LVAD DT involves optimizing the balance between patients who are “too sick” and patients who are “too well”. Extensive prognostic data is available from INTERMACS, the unique registry of LVAD recipients in the USA which is sponsored by the National Heart, Lung, and ...
Percutaneous Left-Atrial Appendage Closure Devices
... and this met non-inferiority criteria with a confidence of >99%. Complications were more common in the Watchman group, with an estimated rate of 5.6%/year in the Watchman group compared to 3.6%/year in the warfarin group. In addition to this RCT, a number of case series have reported on outcomes on ...
... and this met non-inferiority criteria with a confidence of >99%. Complications were more common in the Watchman group, with an estimated rate of 5.6%/year in the Watchman group compared to 3.6%/year in the warfarin group. In addition to this RCT, a number of case series have reported on outcomes on ...
Temporary Pacing power point education
... • Undersensing: pacer not sensing all intrinsic activity so may misfire at inappropriate times • Oversensing: pacer sensing artifact as well as intrinsic activity so may not fire when necessary ...
... • Undersensing: pacer not sensing all intrinsic activity so may misfire at inappropriate times • Oversensing: pacer sensing artifact as well as intrinsic activity so may not fire when necessary ...
Longitudinal Strain Is a Marker of Microvascular Obstruction and
... Objectives: We assessed the value of speckle tracking imaging performed early after a first ST-segment elevation myocardial infarction (STEMI) in order to predict infarct size and functional recovery at 3-month follow-up. Methods: 44 patients with STEMI who underwent revascularization within 12 h of ...
... Objectives: We assessed the value of speckle tracking imaging performed early after a first ST-segment elevation myocardial infarction (STEMI) in order to predict infarct size and functional recovery at 3-month follow-up. Methods: 44 patients with STEMI who underwent revascularization within 12 h of ...
Techniques for ventricular repolarization instability
... polymorphic VT known as Torsades de Pointes (TdP) [28]. 3) Abnormalities of impulse conduction: Abnormal impulse conduction may lead to reentry, where a circuitous wavefront reexcites the same tissue indefinitely. Unidirectional conduction block and slow conduction are required for reentry to occur. ...
... polymorphic VT known as Torsades de Pointes (TdP) [28]. 3) Abnormalities of impulse conduction: Abnormal impulse conduction may lead to reentry, where a circuitous wavefront reexcites the same tissue indefinitely. Unidirectional conduction block and slow conduction are required for reentry to occur. ...
Diastolic Heart Failure: A Concise Review
... necessarily mean that SHF and DHF are part of a single continuum. There are significant differences between SHF and DHF that justify their separation into two different groups. There is no doubt that a normal EF does not necessarily indicate the presence of normal myocardial or even ventricular cont ...
... necessarily mean that SHF and DHF are part of a single continuum. There are significant differences between SHF and DHF that justify their separation into two different groups. There is no doubt that a normal EF does not necessarily indicate the presence of normal myocardial or even ventricular cont ...
Ventricular structure, function, and mechanics at high altitude
... Due to the unique arrangement of myofibers, cardiac form and function are intrinsically linked, as reflected in the cardiac mechanics (LV twist and rotation and ventricular strain) that underpin ventricular function. In response to altered physiological demand, ventricular mechanics acutely change ( ...
... Due to the unique arrangement of myofibers, cardiac form and function are intrinsically linked, as reflected in the cardiac mechanics (LV twist and rotation and ventricular strain) that underpin ventricular function. In response to altered physiological demand, ventricular mechanics acutely change ( ...
Plasma Bin1 Correlates With Heart Failure And Predicts
... The first patients presented with advanced disease, as early disease is usually asymptomatic. These patients were vulnerable to symptomatic arrhythmias originating from the right ventricle, as well as a higher risk of sudden cardiac death. The arrhythmias range from isolated premature ventricular be ...
... The first patients presented with advanced disease, as early disease is usually asymptomatic. These patients were vulnerable to symptomatic arrhythmias originating from the right ventricle, as well as a higher risk of sudden cardiac death. The arrhythmias range from isolated premature ventricular be ...
Fiber Types and Myosin Types in Human Atrial and Ventricular
... types within the human heart was made on the whole heart of two 16-year-old boys who died sudden violent deaths. Seventeen tissue samples, each about 1 cm long, were excised from different regions of the hearts immediately after death (Fig. 1). Four samples came from the right atrium and three from ...
... types within the human heart was made on the whole heart of two 16-year-old boys who died sudden violent deaths. Seventeen tissue samples, each about 1 cm long, were excised from different regions of the hearts immediately after death (Fig. 1). Four samples came from the right atrium and three from ...
PDF
... mainly through the activation of I KACh . Experimental studies also show that vagal stimulation increases the spatial dispersion in atrial refractoriness,25-28 as well as in APD. Both absolute APD/ERP shortening and increased APD/ERP heterogeneity facilitate reentry and tachyarrhythmia. Liu et al.27 ...
... mainly through the activation of I KACh . Experimental studies also show that vagal stimulation increases the spatial dispersion in atrial refractoriness,25-28 as well as in APD. Both absolute APD/ERP shortening and increased APD/ERP heterogeneity facilitate reentry and tachyarrhythmia. Liu et al.27 ...
Diagnostic Approach to Palpitations
... Figure 5. Sinus bradycardia. A “slurred upstroke” of the QRS, or delta wave, suggests Wolff-Parkinson-White syndrome. This finding is associated with paroxysmal atrial tachycardia and other supraventricular arrhythmias. ...
... Figure 5. Sinus bradycardia. A “slurred upstroke” of the QRS, or delta wave, suggests Wolff-Parkinson-White syndrome. This finding is associated with paroxysmal atrial tachycardia and other supraventricular arrhythmias. ...
Implantation Techniques of Leads for Left Ventricular
... Fig. 7. The TORQR (1) is inside the guiding delivery sheath (2), left panel. Both catheters are brought into the roof of the right atrium (upper arrow), where the guiding delivery sheath is kept and the TORQR is advanced to cannulate the coronary sinus (lower arrow), right panel. The guiding deliver ...
... Fig. 7. The TORQR (1) is inside the guiding delivery sheath (2), left panel. Both catheters are brought into the roof of the right atrium (upper arrow), where the guiding delivery sheath is kept and the TORQR is advanced to cannulate the coronary sinus (lower arrow), right panel. The guiding deliver ...
Role of Cardiac Myocyte CXCR4 Expression in Development and
... progenitor stem cells to the infarct zone heart, and cardiac myocyte survival during AMI and chronic heart failure. The SDF-1/CXCR4 axis has also been shown to be critical in cardiac development.9 –11 Although SDF-1/CXCR4 axis is a ...
... progenitor stem cells to the infarct zone heart, and cardiac myocyte survival during AMI and chronic heart failure. The SDF-1/CXCR4 axis has also been shown to be critical in cardiac development.9 –11 Although SDF-1/CXCR4 axis is a ...
Images and Case Reports in Heart Failure
... made to temporarily turn off the LVAD, after full systemic heparinization to an activated clotting time of greater than 300, which the patient tolerated hemodynamically. An arteriogram of the ascending aorta/arch was then performed, and the location of the distal anastomosis of the LVAD outflow graf ...
... made to temporarily turn off the LVAD, after full systemic heparinization to an activated clotting time of greater than 300, which the patient tolerated hemodynamically. An arteriogram of the ascending aorta/arch was then performed, and the location of the distal anastomosis of the LVAD outflow graf ...
atrial fibrillation
... frequency and intensity of symptoms, and decrease the risk of complications and death. Unfortunately, there is no conclusive evidence that the therapies available reduce the mortality rate associated with atrial fibrillation.50 However, treatment is appropriate for patients who are hemodynamically u ...
... frequency and intensity of symptoms, and decrease the risk of complications and death. Unfortunately, there is no conclusive evidence that the therapies available reduce the mortality rate associated with atrial fibrillation.50 However, treatment is appropriate for patients who are hemodynamically u ...
Parasympathetic control of the heart. I. An interventriculo
... the ready differentiation of neuronal cytoplasm, nuclei, and axons from other tissue elements within the heart. Nuclear labeling of retrogradely labeled neurons with diamidino yellow was also readily observed with this optical system but was confirmed by using a UV optical filter that visualizes dia ...
... the ready differentiation of neuronal cytoplasm, nuclei, and axons from other tissue elements within the heart. Nuclear labeling of retrogradely labeled neurons with diamidino yellow was also readily observed with this optical system but was confirmed by using a UV optical filter that visualizes dia ...
Print - Circulation Research
... myocardium with 4-0 suture. Proper functioning of the occluder was confirmed by noting cyanosis of the distal myocardium and cessation of effective contraction after inflation of the balloon and hyperemia and resumption of contraction after deflation. An 18-gauge Tygon catheter was inserted into the ...
... myocardium with 4-0 suture. Proper functioning of the occluder was confirmed by noting cyanosis of the distal myocardium and cessation of effective contraction after inflation of the balloon and hyperemia and resumption of contraction after deflation. An 18-gauge Tygon catheter was inserted into the ...
Independence of Myocardial Oxygen Consumption from Pressure
... total mechanical energy generated by each ventricular contraction, of which external mechanical work is the effective stroke work output of the ventricular pump, and the potential energy is the remaining part unused for the pumping. The P-V trajectory during diastole divides PVA into these two parts ...
... total mechanical energy generated by each ventricular contraction, of which external mechanical work is the effective stroke work output of the ventricular pump, and the potential energy is the remaining part unused for the pumping. The P-V trajectory during diastole divides PVA into these two parts ...
Left Atrial Volume Combined With Atrial Pump Function
... Abstract—Identifying patients at high risk for the occurrence of atrial fibrillation is one means by which subsequent thromboembolic complications may be prevented. Left atrial enlargement is associated with progression of atrial remodeling, which is a substrate for atrial fibrillation, but impaired ...
... Abstract—Identifying patients at high risk for the occurrence of atrial fibrillation is one means by which subsequent thromboembolic complications may be prevented. Left atrial enlargement is associated with progression of atrial remodeling, which is a substrate for atrial fibrillation, but impaired ...
In-Hospital Pediatric Cardiac Arrest
... Cardiac arrests are reported in 2% to 6% of all children admitted to PICUs [1,2,18] and in approximately 4% to 6% of children admitted to a cardiac PICU after cardiac surgery [10,19]. The most common causes of in-hospital cardiac arrests are respiratory failure (asphyxia) and circulatory shock (isch ...
... Cardiac arrests are reported in 2% to 6% of all children admitted to PICUs [1,2,18] and in approximately 4% to 6% of children admitted to a cardiac PICU after cardiac surgery [10,19]. The most common causes of in-hospital cardiac arrests are respiratory failure (asphyxia) and circulatory shock (isch ...
Lone Atrial Fibrillation: Risk Factors, Triggers And Ablation
... increased aortic stiffness) had higher recurrence rates. The causes of this aortic stiffness, except for hypertension, are not completely clear.46 Chen et al observed an association between increased carotid intima-media thickness and arterial stiffness with LAF. Arterial stiffness was found to be h ...
... increased aortic stiffness) had higher recurrence rates. The causes of this aortic stiffness, except for hypertension, are not completely clear.46 Chen et al observed an association between increased carotid intima-media thickness and arterial stiffness with LAF. Arterial stiffness was found to be h ...
Ventricular fibrillation
Ventricular fibrillation (V-fib or VF) is a condition in which there is uncoordinated contraction of the cardiac muscle of the ventricles in the heart, making them quiver rather than contract properly. Ventricular fibrillation is the most commonly identified arrhythmia in cardiac arrest patients. While there is some activity, the lay person is usually unable to detect it by palpating (feeling) the major pulse points of the carotid and femoral arteries. Such an arrhythmia is only confirmed by electrocardiography. Ventricular fibrillation is a medical emergency that requires prompt Advanced Life Support interventions. If this arrhythmia continues for more than a few seconds, it will likely degenerate further into asystole (""flatline""). This condition results in cardiogenic shock and cessation of effective blood circulation. As a consequence, sudden cardiac death (SCD) will result in a matter of minutes. If the patient is not revived after a sufficient period (within roughly 5 minutes at room temperature), the patient could sustain irreversible brain damage and possibly become brain-dead, due to the effects of cerebral hypoxia. On the other hand, death often occurs if sinus rhythm is not restored within 90 seconds of the onset of VF, especially if it has degenerated further into asystole.