Editorials Original Articles - Circulation: Arrhythmia and
... Esteban W. Rivarola, MD, PhD; Denise Hachul, MD, PhD; Tan Wu, MD; Cristiano Pisani, MD; Carina Hardy, MD; Fabrizio Raimundi, BS; Sissy Melo, MD, PhD; Francisco Darrieux, MD, PhD; Mauricio Scanavacca, MD, PhD · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ...
... Esteban W. Rivarola, MD, PhD; Denise Hachul, MD, PhD; Tan Wu, MD; Cristiano Pisani, MD; Carina Hardy, MD; Fabrizio Raimundi, BS; Sissy Melo, MD, PhD; Francisco Darrieux, MD, PhD; Mauricio Scanavacca, MD, PhD · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ...
Libby: Braunwald`s Heart Disease: A Textbook of Cardiovascular
... ventricle. Volume overload can produce a somewhat different pattern, including tall upright T waves and sometimes narrow (less than 30 milliseconds) but deep (0.2 mV or greater) Q waves in leads facing the left side of the septum (see Fig. 12-20 ). The diagnostic value of these changes in predicting ...
... ventricle. Volume overload can produce a somewhat different pattern, including tall upright T waves and sometimes narrow (less than 30 milliseconds) but deep (0.2 mV or greater) Q waves in leads facing the left side of the septum (see Fig. 12-20 ). The diagnostic value of these changes in predicting ...
Noninvasive Evaluation of Myocardial Ischemia and Left
... The general aim of this thesis was, following the path of the ischemic cascade, to evaluate the feasibility of some new non-invasive techniques for the detection of myocardial ischemia, the extent of infarcted myocardium, and for the quantification of systolic left ventricular function. Reduced long ...
... The general aim of this thesis was, following the path of the ischemic cascade, to evaluate the feasibility of some new non-invasive techniques for the detection of myocardial ischemia, the extent of infarcted myocardium, and for the quantification of systolic left ventricular function. Reduced long ...
Syncope in congestive heart failure
... A major limitation of the ICD-based analysis is the use of appropriate ICD therapies as a measure of outcome. Many ventricular tachycardia episodes terminate spontaneously without event. Therefore, ICD shocks may not be a reliable surrogate for sudden cardiac death [20, 21]. A recent post hoc analys ...
... A major limitation of the ICD-based analysis is the use of appropriate ICD therapies as a measure of outcome. Many ventricular tachycardia episodes terminate spontaneously without event. Therefore, ICD shocks may not be a reliable surrogate for sudden cardiac death [20, 21]. A recent post hoc analys ...
Transmural heterogeneity of diffusion anisotropy in the - AJP
... Whereas the smooth shape and image contrast of the LV epicardial boundary make it relatively easy to delineate, the presence of the papillary muscle and trabeculations has been a significant source of variation in manual definition of the endocardial boundary (7, 25, 47). For the present study, the ...
... Whereas the smooth shape and image contrast of the LV epicardial boundary make it relatively easy to delineate, the presence of the papillary muscle and trabeculations has been a significant source of variation in manual definition of the endocardial boundary (7, 25, 47). For the present study, the ...
Early right ventricular fibrosis and reduction in - AJP
... DMD is characterized by a relentless downward trajectory (15, 53). This decline in cardiac function can be slowed using steroids and standard heart failure treatments (40, 56), but there remains no effective specific therapy for DMD, and inevitably these patients die of respiratory and/or cardiac co ...
... DMD is characterized by a relentless downward trajectory (15, 53). This decline in cardiac function can be slowed using steroids and standard heart failure treatments (40, 56), but there remains no effective specific therapy for DMD, and inevitably these patients die of respiratory and/or cardiac co ...
Herz Significance of Late Gadolinium Enhancement in
... imaging [22]. However, due to its higher spatial resolution LGE-CMR is clearly superior to SPECT in the detection of small subendocardial infarctions (sensitivity of 92% for LGE-CMR vs. 28% for SPECT) [53]. Occasionally, it may be challenging to distinguish such small subendocardial hyperenhancement ...
... imaging [22]. However, due to its higher spatial resolution LGE-CMR is clearly superior to SPECT in the detection of small subendocardial infarctions (sensitivity of 92% for LGE-CMR vs. 28% for SPECT) [53]. Occasionally, it may be challenging to distinguish such small subendocardial hyperenhancement ...
PDF - Circulation
... first shock. Of note, the shape of the curve between percent success and the defibrillation threshold ratio depended on the particular electrodes used. This suggests that in addition to surface area of electrodes, the efficiency of a particular electrode system may also be important in determining t ...
... first shock. Of note, the shape of the curve between percent success and the defibrillation threshold ratio depended on the particular electrodes used. This suggests that in addition to surface area of electrodes, the efficiency of a particular electrode system may also be important in determining t ...
Basic Cardiac Rhythms - UT Health : The University of Toledo
... Are P waves present? Are P waves occurring regularly? Is there one P wave present for every QRS complex present? Are the P waves smooth, rounded, and upright in appearance, or are they ...
... Are P waves present? Are P waves occurring regularly? Is there one P wave present for every QRS complex present? Are the P waves smooth, rounded, and upright in appearance, or are they ...
Molecular Mechanisms of Myocardial Remodeling
... of continuous therapy. Such a long-term treatment also reverses CR by decreasing ventricular mass and volume. There was also an increase in the sphericity index, which indicates that the ventricle recovers its ellipticity. III. PHENOTYPIC CHANGES IN MYOCYTES Because of the development in molecular a ...
... of continuous therapy. Such a long-term treatment also reverses CR by decreasing ventricular mass and volume. There was also an increase in the sphericity index, which indicates that the ventricle recovers its ellipticity. III. PHENOTYPIC CHANGES IN MYOCYTES Because of the development in molecular a ...
Relation of Ultrastructure to Function in the Intact Heart: Sarcomere
... preparation was perfused with fixative through the previously cannulated left coronary artery, employing glutaraldehyde, 6.25%, in phosphate buffer, pH 7.6. Previous studies have shown that this fixative does not change resting muscle tension9 and does not significantly alter filament dimensions or ...
... preparation was perfused with fixative through the previously cannulated left coronary artery, employing glutaraldehyde, 6.25%, in phosphate buffer, pH 7.6. Previous studies have shown that this fixative does not change resting muscle tension9 and does not significantly alter filament dimensions or ...
Spotlight on atrial fibrillation—the `complete arrhythmia`
... between pulse curves in clinical delirium cordis and those in dogs with induced auricular fibrillation [6]. Fredericq demonstrated the role of AF in causing the associated irregularity in ventricular contraction by cutting the bundle of His, after which the atria continued to fibrillate but the vent ...
... between pulse curves in clinical delirium cordis and those in dogs with induced auricular fibrillation [6]. Fredericq demonstrated the role of AF in causing the associated irregularity in ventricular contraction by cutting the bundle of His, after which the atria continued to fibrillate but the vent ...
What`s new in diagnosis and therapy of atrial fibrillation?
... bursts. The atria are driven into AF by these foci, but there is only small if any atrial remodelling, so that AF stops spontaneously after a short time. Consequently, the electrical isolation of the PV, first described by Haissaguerre et al. [6], remains the cornerstone of all ablation approaches f ...
... bursts. The atria are driven into AF by these foci, but there is only small if any atrial remodelling, so that AF stops spontaneously after a short time. Consequently, the electrical isolation of the PV, first described by Haissaguerre et al. [6], remains the cornerstone of all ablation approaches f ...
Visualization and quantification of myocardial mass at risk using
... method was evaluated in the porcine model of myocardial ischemia using a novel contrast agent. Methods: Three-dimensional echocardiography was performed in eight open-chested pigs before, during and after left anterior descending (six animals) or circumflex (two animals) coronary artery occlusion. T ...
... method was evaluated in the porcine model of myocardial ischemia using a novel contrast agent. Methods: Three-dimensional echocardiography was performed in eight open-chested pigs before, during and after left anterior descending (six animals) or circumflex (two animals) coronary artery occlusion. T ...
Flecainide: Current status and perspectives in arrhythmia
... rapidly without any significant interactions with food or antacid. Its bioavailability is around 90%, indicating no significant first pass effect through the liver. In normal subjects, plasma peak levels are reached after 2-3 h and steady state levels within 3-5 d. The half-life of flecainide ranges ...
... rapidly without any significant interactions with food or antacid. Its bioavailability is around 90%, indicating no significant first pass effect through the liver. In normal subjects, plasma peak levels are reached after 2-3 h and steady state levels within 3-5 d. The half-life of flecainide ranges ...
Right Ventricular Dilatation on Bedside Echocardiography
... (moderate to high pretest probability) or confirmed pulmonary embolism. Participants had bedside echocardiography evaluating for right ventricular dilatation (defined as right ventricular to left ventricular ratio greater than 1:1) and right ventricular dysfunction (right ventricular hypokinesis, para ...
... (moderate to high pretest probability) or confirmed pulmonary embolism. Participants had bedside echocardiography evaluating for right ventricular dilatation (defined as right ventricular to left ventricular ratio greater than 1:1) and right ventricular dysfunction (right ventricular hypokinesis, para ...
Interpreting AV (Heart) Blocks: Breaking Down the Mystery 2 Contact Hours
... 2. Identify basic components of an ECG strip. 3. Describe the causes of atrioventricular heart blocks. 4. Distinguish between the degrees of heart blocks by identifying rhythm strips. ...
... 2. Identify basic components of an ECG strip. 3. Describe the causes of atrioventricular heart blocks. 4. Distinguish between the degrees of heart blocks by identifying rhythm strips. ...
clinical value of unipolar chest and limb leads
... main initial deflection to be recorded in health. When the impulse reaches the surface ofthe ventricle, a negative charge is reflected to the surface of the body, and a negative downward deflection, called the intrinsic deflection by Lewis, occurs. Whether or not this downward deflection is prolonge ...
... main initial deflection to be recorded in health. When the impulse reaches the surface ofthe ventricle, a negative charge is reflected to the surface of the body, and a negative downward deflection, called the intrinsic deflection by Lewis, occurs. Whether or not this downward deflection is prolonge ...
Echocardiographic diastolic parameters and risk of atrial
... standardized training of echo technicians and readers, periodic technician observation by a trained echocardiographer, blind duplicate readings to establish interreader and intrareader measurement variabilities, periodic reader review sessions, phantom studies on the ultrasound equipment, and qualit ...
... standardized training of echo technicians and readers, periodic technician observation by a trained echocardiographer, blind duplicate readings to establish interreader and intrareader measurement variabilities, periodic reader review sessions, phantom studies on the ultrasound equipment, and qualit ...
Myocardial Infarct Size-Limiting Effect of Chronic
... previously ischemic tissue was indicated by changes of the ECG, transient decrease of blood pressure and appearance of reperfusion arrhythmias. Analysis of arrhythmias The incidence and severity of ischemic arrhythmias during prolonged ischemic insult were assessed according to the Lambeth Conventio ...
... previously ischemic tissue was indicated by changes of the ECG, transient decrease of blood pressure and appearance of reperfusion arrhythmias. Analysis of arrhythmias The incidence and severity of ischemic arrhythmias during prolonged ischemic insult were assessed according to the Lambeth Conventio ...
Temporary epicardial pacing after cardiac surgery
... to detect, and it may be necessary to inspect a variety of leads. Extracardiac, high frequency interference may become problematic, in which case the monitor can be returned to its usual mode after pacing diagnostics have occurred. Electrical pacemaker output does not necessarily equate to mechanica ...
... to detect, and it may be necessary to inspect a variety of leads. Extracardiac, high frequency interference may become problematic, in which case the monitor can be returned to its usual mode after pacing diagnostics have occurred. Electrical pacemaker output does not necessarily equate to mechanica ...
Multimodal functional cardiac MRI in creatine kinase
... However, cardiac output and LV ejection fraction remained normal in these mice (15). Furthermore, when CK⫺/⫺ mice were examined 4 wk after the induction of myocardial infarction (MI), no evidence of adverse LV remodeling was seen (15). Therefore, the aim of the current study was to determine whether ...
... However, cardiac output and LV ejection fraction remained normal in these mice (15). Furthermore, when CK⫺/⫺ mice were examined 4 wk after the induction of myocardial infarction (MI), no evidence of adverse LV remodeling was seen (15). Therefore, the aim of the current study was to determine whether ...
Intramyocardial Analysis of Regional Systolic and Diastolic Function
... consistent in mesocardium. In diastole, there was a decrease in maximal MV in all layers, being more pronounced in endocardium and mesocardium. Diastolic mean MVG was shown to be different between control and ischemic groups (–0.2 ± 0.05 vs –0.10 ± 0.04, P < .06). A significant decrease of the maxim ...
... consistent in mesocardium. In diastole, there was a decrease in maximal MV in all layers, being more pronounced in endocardium and mesocardium. Diastolic mean MVG was shown to be different between control and ischemic groups (–0.2 ± 0.05 vs –0.10 ± 0.04, P < .06). A significant decrease of the maxim ...
Arrythmia 411
... • No atrial activity conducts to the ventricles • AV dissociation is present. The atria and ventricles are controlled by independent pacemakers. • Ventricular focus is usually located just below the site of block. • Higher sites are more stable with a more faster escape rate. Tehran Arrhythmia Cente ...
... • No atrial activity conducts to the ventricles • AV dissociation is present. The atria and ventricles are controlled by independent pacemakers. • Ventricular focus is usually located just below the site of block. • Higher sites are more stable with a more faster escape rate. Tehran Arrhythmia Cente ...
Acute Respiratory Acidosis Decreases Left Ventricular Contractility
... and Vmy~ocdium were determined as the slope and intercept of the best-fit line relating known balloon volume and Dap x Dlong xDgf. The assumption made in this postmortem calibration that the principle axes of deformation of the left ventricle are identical during contraction of the heart in life com ...
... and Vmy~ocdium were determined as the slope and intercept of the best-fit line relating known balloon volume and Dap x Dlong xDgf. The assumption made in this postmortem calibration that the principle axes of deformation of the left ventricle are identical during contraction of the heart in life com ...
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.