Sunao Tawara: Discoverer of the atrioventricular conduction system
... Willem Einthoven and his colleagues, the mechanism by which four cardiac chambers contract synchronously as a cohesive unit remained unknown. Two theories predominated: the myogenic theory and the neurogenic theory [1–4]. The discovery by Sunao Tawara of the atrioventricular (AV) conduction system, ...
... Willem Einthoven and his colleagues, the mechanism by which four cardiac chambers contract synchronously as a cohesive unit remained unknown. Two theories predominated: the myogenic theory and the neurogenic theory [1–4]. The discovery by Sunao Tawara of the atrioventricular (AV) conduction system, ...
Left Ventricular Hypertrophy Is Associated With Increased Infarct
... Methods and Results-—In this substudy of the DANAMI-3 trial, 764 patients underwent CMR. LVH was defined by CMR and considered present if LV mass exceeded 77 (men) and 67 g/m2 (women). One hundred seventy-eight patients (24%) had LVH. LVH was associated with a larger final infarct size (15% [interquar ...
... Methods and Results-—In this substudy of the DANAMI-3 trial, 764 patients underwent CMR. LVH was defined by CMR and considered present if LV mass exceeded 77 (men) and 67 g/m2 (women). One hundred seventy-eight patients (24%) had LVH. LVH was associated with a larger final infarct size (15% [interquar ...
Diastolic Dysfunction and Anaesthetic Implications Dr S Kumar MD
... There is no specific risk model for predicting perioperative risk in patients with HfpreEF. When planning surgical procedures in patients with stable HF, it is important to identify those patients that are unlikely to survive long enough to accrue benefit from the procedure. Data from studies descri ...
... There is no specific risk model for predicting perioperative risk in patients with HfpreEF. When planning surgical procedures in patients with stable HF, it is important to identify those patients that are unlikely to survive long enough to accrue benefit from the procedure. Data from studies descri ...
Estimation of left ventricular operating stiffness from - AJP
... suspended ventilation before cardiopulmonary bypass, during partial (1.5–2 l/min) cardiopulmonary bypass, and after surgery. Ventilation was suspended for at most 20–30 s at a time during which time data collection was performed. All patients had continuous routine oxygen saturation monitoring, and ...
... suspended ventilation before cardiopulmonary bypass, during partial (1.5–2 l/min) cardiopulmonary bypass, and after surgery. Ventilation was suspended for at most 20–30 s at a time during which time data collection was performed. All patients had continuous routine oxygen saturation monitoring, and ...
Increasing survival rate from commotio cordis
... conveyed the distinctly unfavorable impression that commotio cordis-related ventricular fibrillation was rarely reversible by cardiopulmonary resuscitation and life support (with a reported survival rate of only about 10%–15%).1,2,4 Also, one case report documented the failure to resuscitate a commo ...
... conveyed the distinctly unfavorable impression that commotio cordis-related ventricular fibrillation was rarely reversible by cardiopulmonary resuscitation and life support (with a reported survival rate of only about 10%–15%).1,2,4 Also, one case report documented the failure to resuscitate a commo ...
Patterns of muscular strain in the embryonic heart wall
... genetic state or molecular environment of these cells may not be the only mediators of this spatial pattern of withdrawal, that differences in physical parameters across the wall may directly affect cell proliferation (deAlmeida et al., 2007). Physical parameters that vary significantly with position ...
... genetic state or molecular environment of these cells may not be the only mediators of this spatial pattern of withdrawal, that differences in physical parameters across the wall may directly affect cell proliferation (deAlmeida et al., 2007). Physical parameters that vary significantly with position ...
Transmitral Flow Changes during DipyridamoleInduced lschemia*
... had to be excluded which precluded the ...
... had to be excluded which precluded the ...
Left Ventricular Diastolic Function in Patients With
... Pulmonary Unit (Dr. Ginns), Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA. ...
... Pulmonary Unit (Dr. Ginns), Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA. ...
Catheter Ablation for Atrial Fibrillation
... arrhythmia-free survival corresponding to an average actuarial event rate of 8.9% per year. Univariate predictors of recurrence were long-standing persistent AF (HR: 2.6, 95% CI: 1.1 to 6.0; p ⫽ 0.0319), presence of valvular heart disease (HR: 5.2, 95% CI: 1.8 to 15.2; p ⫽ 0.0026), and nonischemic d ...
... arrhythmia-free survival corresponding to an average actuarial event rate of 8.9% per year. Univariate predictors of recurrence were long-standing persistent AF (HR: 2.6, 95% CI: 1.1 to 6.0; p ⫽ 0.0319), presence of valvular heart disease (HR: 5.2, 95% CI: 1.8 to 15.2; p ⫽ 0.0026), and nonischemic d ...
Corrected Transposition of the Great Arteries
... • The evidence is strong that right ventricle should not remain in the systemic circulation as it does after a conventional repair • A combined arterial switch and Senning operation ( double switch operation ) is an option for patients with cc-TGA with two ventricles of adequate size for biventricul ...
... • The evidence is strong that right ventricle should not remain in the systemic circulation as it does after a conventional repair • A combined arterial switch and Senning operation ( double switch operation ) is an option for patients with cc-TGA with two ventricles of adequate size for biventricul ...
Impact of ejection on magnitude and time course of ventricular
... (LVP) throughout the cardiac cycle, with particular emphasis on revealing specific limitations in the time-varying elastance modelof ventricular dynamics. Studieswere performedin eight isolated canine hearts ejecting into a simulated windkesselafterload. LVP waves measured(LVP,) during ejection were ...
... (LVP) throughout the cardiac cycle, with particular emphasis on revealing specific limitations in the time-varying elastance modelof ventricular dynamics. Studieswere performedin eight isolated canine hearts ejecting into a simulated windkesselafterload. LVP waves measured(LVP,) during ejection were ...
Implantable Cardioverter
... Most people who use it do not have any daily concerns with living with ...
... Most people who use it do not have any daily concerns with living with ...
Torsade de pointes: the clinical considerations
... Torsade de pointes is a form of polymorphic ventricular tachycardia occurring in a setting of prolonged QT interval on surface electrocardiogram. Congenital causes of prolonged QT interval occur in individuals with genetic mutations in genes that control expression of potassium and sodium channels a ...
... Torsade de pointes is a form of polymorphic ventricular tachycardia occurring in a setting of prolonged QT interval on surface electrocardiogram. Congenital causes of prolonged QT interval occur in individuals with genetic mutations in genes that control expression of potassium and sodium channels a ...
Should rhythm control be preferred in younger atrial fibrillation
... However, treatment of AF remains one of the most difficult tasks of cardiology. For a decade, several studies have compared the strategy of maintenance of sinus rhythm, called rhythm control, with the strategy of heart rate control during AF and found that the rhythm control strategy was not superio ...
... However, treatment of AF remains one of the most difficult tasks of cardiology. For a decade, several studies have compared the strategy of maintenance of sinus rhythm, called rhythm control, with the strategy of heart rate control during AF and found that the rhythm control strategy was not superio ...
Diastolic Heart Failure — Abnormalities in Active
... The diastolic pressure–volume relation can be described by an exponential equation, P=AebV, where P is the left ventricular diastolic pressure, V is the left ventricular diastolic volume, and A and b are curvefitting constants used to quantify passive stiffness.4 We reasoned that the abnormally slow ...
... The diastolic pressure–volume relation can be described by an exponential equation, P=AebV, where P is the left ventricular diastolic pressure, V is the left ventricular diastolic volume, and A and b are curvefitting constants used to quantify passive stiffness.4 We reasoned that the abnormally slow ...
Nandrolone Plus Moderate Exercise Increases the Susceptibility to
... Where RR is R-R interval and f = 150 msec (16-18). The premature ventricular contraction (PVC), ventricular tachycardia (VT), and ventricular fibrillation (VF) were counted during the 15 minutes of the experiment, and the latency and duration of PVC, VT, and VF was measured in seconds. According to ...
... Where RR is R-R interval and f = 150 msec (16-18). The premature ventricular contraction (PVC), ventricular tachycardia (VT), and ventricular fibrillation (VF) were counted during the 15 minutes of the experiment, and the latency and duration of PVC, VT, and VF was measured in seconds. According to ...
Apical Right Ventricular Hypertrophic Cardiomyopathy—A Case
... gene) had been identified in these families. A family history is more common in patients with asymmetric septal hypertrophy than with apical hypertrophic cardiomyopathy. Morphologically apical HCM is divided into 3 types; pure focal, pure diffuse and mixed, of which pure focal is most common [4]. Ot ...
... gene) had been identified in these families. A family history is more common in patients with asymmetric septal hypertrophy than with apical hypertrophic cardiomyopathy. Morphologically apical HCM is divided into 3 types; pure focal, pure diffuse and mixed, of which pure focal is most common [4]. Ot ...
Hypertensive cardiomyopathy: A clinical approach and literature
... variables). Cuspidi et al[14] also reported that concentric LV hypertrophy is not the most frequent geometric pattern and is less commonly seen than is eccentric hypertrophy in the hypertensive subjects. Indeed, the geometric pattern of LVH affects the prognosis[30]. Patients without an increase in ...
... variables). Cuspidi et al[14] also reported that concentric LV hypertrophy is not the most frequent geometric pattern and is less commonly seen than is eccentric hypertrophy in the hypertensive subjects. Indeed, the geometric pattern of LVH affects the prognosis[30]. Patients without an increase in ...
Differential Effects of Antihypertensive Treatment on Left Ventricular
... These effects were independent of other factors associated with diastolic dysfunction including the BPlowering effect of the drug and LVMI. Differences in E/E= between the 2 treatment regimens could be accounted for by differences in heart rate, but this did not explain the differences in E= or BNP. ...
... These effects were independent of other factors associated with diastolic dysfunction including the BPlowering effect of the drug and LVMI. Differences in E/E= between the 2 treatment regimens could be accounted for by differences in heart rate, but this did not explain the differences in E= or BNP. ...
WIDE QRS TACHYCARDIA DR ANKUR
... QR (but not a QS) complex. • Presence indicates a scar in myocardium usually caused by myocardial infarction. • QR complexes during VT are present in approximately 40% of VTs after myocardial infarction. ...
... QR (but not a QS) complex. • Presence indicates a scar in myocardium usually caused by myocardial infarction. • QR complexes during VT are present in approximately 40% of VTs after myocardial infarction. ...
Steeper restitution slopes across right ventricular endocardium in
... Heart Circ Physiol 292: H1262–H1268, 2007. First published November 10, 2006; doi:10.1152/ajpheart.00913.2006.—Steep action potential duration (APD) restitution slopes (⬎1) and spatial APD restitution heterogeneity provide the substrate for ventricular fibrillation in computational models and experi ...
... Heart Circ Physiol 292: H1262–H1268, 2007. First published November 10, 2006; doi:10.1152/ajpheart.00913.2006.—Steep action potential duration (APD) restitution slopes (⬎1) and spatial APD restitution heterogeneity provide the substrate for ventricular fibrillation in computational models and experi ...
Comparative Ultrastructural Morphometry Of The Relationship
... Comparative ultrastructural morphometry shows that area of myofibrils covered by SR in left ventricular myocytes is 54% in the insect-eating bat (Pipistrellus pipistrellus), 40% in the nonhibernating hamster and 32% in the hamster in hibernating conditions. Similarly, the area of T-tubules covered b ...
... Comparative ultrastructural morphometry shows that area of myofibrils covered by SR in left ventricular myocytes is 54% in the insect-eating bat (Pipistrellus pipistrellus), 40% in the nonhibernating hamster and 32% in the hamster in hibernating conditions. Similarly, the area of T-tubules covered b ...
Linköping University Post Print Computer-assisted determination of left ventricular endocardial borders reduces
... (LVEF) and wall thickness are strong predictors for survival in most types of cardiac diseases. These measurements have important implications for therapy. The optimal timing for valve surgery and supportive surgery for heart failure such as ventricular restraint, ventricular restoration and left ve ...
... (LVEF) and wall thickness are strong predictors for survival in most types of cardiac diseases. These measurements have important implications for therapy. The optimal timing for valve surgery and supportive surgery for heart failure such as ventricular restraint, ventricular restoration and left ve ...
Green tea extract catechin improves internal cardiac muscle
... Background: Diastolic dysfunction refers to an impaired relaxation and an abnormality in a heart’s filling during diastole while left ventricular systolic function is preserved. Diastolic dysfunction is commonly observed in patients with primary hypertension, diabetes and cardiomyopathies such as hy ...
... Background: Diastolic dysfunction refers to an impaired relaxation and an abnormality in a heart’s filling during diastole while left ventricular systolic function is preserved. Diastolic dysfunction is commonly observed in patients with primary hypertension, diabetes and cardiomyopathies such as hy ...
Fine-tuning ECG Parameters Technique for Precise Abnormalities Detection
... work, including the most famous philosophies used to analyses the parameters of the ECG, and incremental learning algorithms utilized to classify arrhythmias. A. Analysis of the Parameter Computational Problem Some of the most descriptors of the QRS complex morphology are developed using pattern rec ...
... work, including the most famous philosophies used to analyses the parameters of the ECG, and incremental learning algorithms utilized to classify arrhythmias. A. Analysis of the Parameter Computational Problem Some of the most descriptors of the QRS complex morphology are developed using pattern rec ...
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.