Myofiber prestretch magnitude determines regional systolic function
... saline solution (6 M NaCl). Arterial and aortic pressures were monitored with fluid-filled gauges positioned in the right femoral artery and left subclavian artery, respectively. Lead II electrocardiogram was recorded, along with local bipolar electrograms from nonpaced LV electrodes. A custom epica ...
... saline solution (6 M NaCl). Arterial and aortic pressures were monitored with fluid-filled gauges positioned in the right femoral artery and left subclavian artery, respectively. Lead II electrocardiogram was recorded, along with local bipolar electrograms from nonpaced LV electrodes. A custom epica ...
contrast echocardiography
... When insonated, gas bubbles pulsate, with compression at the peak of the ultrasound wave and expansion at the nadir. Electron microscopy studies have eloquently demonstrated the extent of this volume pulsation with bubble radius changing by a factor of 20 or more. In an ultrasound beam with a freque ...
... When insonated, gas bubbles pulsate, with compression at the peak of the ultrasound wave and expansion at the nadir. Electron microscopy studies have eloquently demonstrated the extent of this volume pulsation with bubble radius changing by a factor of 20 or more. In an ultrasound beam with a freque ...
Print - Circulation
... wires attached to the right atrium. Before the first defibrillation attempt, atrial fibrillation was permitted to sustain for 5 minutes to demonstrate adequate stability. If atrial fibrillation spontaneously terminated in less than 5 minutes, t3-methacholine, 50 ,ug/250 mL normal saline, was applied ...
... wires attached to the right atrium. Before the first defibrillation attempt, atrial fibrillation was permitted to sustain for 5 minutes to demonstrate adequate stability. If atrial fibrillation spontaneously terminated in less than 5 minutes, t3-methacholine, 50 ,ug/250 mL normal saline, was applied ...
anatomy of the cardiovascular system
... ment of the second through the sixth ribs. Approximately two thirds of the heart’s mass is to the left of the midline of the body and one third to the right. Posteriorly the heart rests against the bodies of the fifth to the eighth thoracic vertebrae. Because of its placement between the sternum in ...
... ment of the second through the sixth ribs. Approximately two thirds of the heart’s mass is to the left of the midline of the body and one third to the right. Posteriorly the heart rests against the bodies of the fifth to the eighth thoracic vertebrae. Because of its placement between the sternum in ...
Cardiac MRI: Part 1, Cardiovascular Shunts
... important parameter that needs to be assessed in patients with unrestricted left-to-right shunts who are at risk of obstructive pulmonary vascular disease. Surgery is avoided in patients with high PVR because of increased perioperative mortality. This information is typically acquired using oximetry ...
... important parameter that needs to be assessed in patients with unrestricted left-to-right shunts who are at risk of obstructive pulmonary vascular disease. Surgery is avoided in patients with high PVR because of increased perioperative mortality. This information is typically acquired using oximetry ...
Tamponade and Pericardial Diseases
... autosomal recessive disorder, primarily found in the Finnish population that can lead to congestive heart failure in early adult life and is partially characterized by the development of constrictive pericarditis in some affected individuals. TEE findings of constrictive pericarditis will be discuss ...
... autosomal recessive disorder, primarily found in the Finnish population that can lead to congestive heart failure in early adult life and is partially characterized by the development of constrictive pericarditis in some affected individuals. TEE findings of constrictive pericarditis will be discuss ...
Cardiac sympathetic innervation via middle cervical and stellate
... channelopathies, including long QT syndrome and catecholaminergic polymorphic ventricular tachycardia, who have structurally normal hearts (4, 17, 38). In a small series of patients with structural heart disease, bilateral CSD has shown promise in reducing the burden of internal cardioverter defibri ...
... channelopathies, including long QT syndrome and catecholaminergic polymorphic ventricular tachycardia, who have structurally normal hearts (4, 17, 38). In a small series of patients with structural heart disease, bilateral CSD has shown promise in reducing the burden of internal cardioverter defibri ...
Effect of physical exercise on autonomic regulation of heart rate
... The aims of this study were to evaluate the autonomic regulation of heart rate (HR) during and after exercise, during aerobic training interventions and to study the association between autonomic regulation and the training response in healthy male subjects. HR variability assessment was used to stu ...
... The aims of this study were to evaluate the autonomic regulation of heart rate (HR) during and after exercise, during aerobic training interventions and to study the association between autonomic regulation and the training response in healthy male subjects. HR variability assessment was used to stu ...
Left Ventricular Assist Device as Destination Therapy
... medical management (4). This trial was performed using a pulsatile HeartMate I (HMI) (Thoratec Corporation, Pleasanton, California) device. This was later approved by the Food and Drug Administration (FDA) for DT and subsequently covered by Medicare in 2003. Later, a continuous flow HeartMate II (HM ...
... medical management (4). This trial was performed using a pulsatile HeartMate I (HMI) (Thoratec Corporation, Pleasanton, California) device. This was later approved by the Food and Drug Administration (FDA) for DT and subsequently covered by Medicare in 2003. Later, a continuous flow HeartMate II (HM ...
Pericardial Disease - Society of Cardiovascular Anesthesiologists
... and will vary with the respiratory cycle demonstrating pressures of approximately –6 mm Hg at end inspiration and –3 mm Hg at end expiration (NB – as measured by a fluid filled, non-balloon tipped catheter). It is the lowering of intrathoracic and pericardial pressure during inspiration that permits ...
... and will vary with the respiratory cycle demonstrating pressures of approximately –6 mm Hg at end inspiration and –3 mm Hg at end expiration (NB – as measured by a fluid filled, non-balloon tipped catheter). It is the lowering of intrathoracic and pericardial pressure during inspiration that permits ...
Branches of this artery as I said when it reaches to
... the right coronary artery over here the heart in this case of this picture is straight forward it isn’t in claim so you will see the left and the right one &this is circumflex & this LAD artery (left anterior descending artery ),and that the right coronary artery & this is the marginal artery ,obser ...
... the right coronary artery over here the heart in this case of this picture is straight forward it isn’t in claim so you will see the left and the right one &this is circumflex & this LAD artery (left anterior descending artery ),and that the right coronary artery & this is the marginal artery ,obser ...
Atrium-Selective Sodium Channel Block as a Strategy
... Methods and Results—Whole-cell patch clamp techniques were used to evaluate inactivation of peak sodium channel current (INa) in myocytes isolated from canine atria and ventricles. The electrophysiological effects of therapeutic concentrations of ranolazine (1 to 10 mol/L) and lidocaine (2.1 to 21 ...
... Methods and Results—Whole-cell patch clamp techniques were used to evaluate inactivation of peak sodium channel current (INa) in myocytes isolated from canine atria and ventricles. The electrophysiological effects of therapeutic concentrations of ranolazine (1 to 10 mol/L) and lidocaine (2.1 to 21 ...
Ventricular Fibrillation and the Use of Automated
... energy delivered by some AEDs showed that for patients younger than 10 years, the 8 VF rhythms were identified correctly, as were the 10 nonshockable rhythms. AED ENERGY AND WAVEFORM SAFETY AND EFFICACY Defibrillation involves delivery of current through the chest and to the heart to depolarize myoc ...
... energy delivered by some AEDs showed that for patients younger than 10 years, the 8 VF rhythms were identified correctly, as were the 10 nonshockable rhythms. AED ENERGY AND WAVEFORM SAFETY AND EFFICACY Defibrillation involves delivery of current through the chest and to the heart to depolarize myoc ...
Heart and Vascular System Practice Questions
... 19. A precapillary sphincter muscle controls the flow of blood from A. capillary to venule. B. arteriole to capillary. C. artery to arteriole. D. capillary to arteriole. 20. If excessive fluid retention increases blood volume, blood pressure is likely to A. decrease. B. be unaffected. C. increase. D ...
... 19. A precapillary sphincter muscle controls the flow of blood from A. capillary to venule. B. arteriole to capillary. C. artery to arteriole. D. capillary to arteriole. 20. If excessive fluid retention increases blood volume, blood pressure is likely to A. decrease. B. be unaffected. C. increase. D ...
Vilniaus Universitetas
... Conduction system of the human heart is a specialized myogenic tissue that generates and transmits bioelectrical impulse. This impulse produces synchronical excitation and contraction of the distinct part of the myocardium. Components of the conduction system are found in all parts of the human hear ...
... Conduction system of the human heart is a specialized myogenic tissue that generates and transmits bioelectrical impulse. This impulse produces synchronical excitation and contraction of the distinct part of the myocardium. Components of the conduction system are found in all parts of the human hear ...
Heart Rate Variability During Waking and Sleep in Healthy Males
... ECG electrodes included two chest electrodes below the left and right clavicles, respectively, and one electrode on the side below the subject's lowest left rib. Experimental Protocol Polysomnography and ECG recordings were performed during one night in the sleep laboratory, and included a one-hour ...
... ECG electrodes included two chest electrodes below the left and right clavicles, respectively, and one electrode on the side below the subject's lowest left rib. Experimental Protocol Polysomnography and ECG recordings were performed during one night in the sleep laboratory, and included a one-hour ...
Role of Echocardiography in the Diagnosis of Constrictive Pericarditis
... cardial calcification is dependent on the underlying cause of CP and is less commonly encountered in developing nations as the incidence of tuberculous pericarditis has declined. A recent series of 136 patients reported radiographic evidence of pericardial calcification in approximately one third of p ...
... cardial calcification is dependent on the underlying cause of CP and is less commonly encountered in developing nations as the incidence of tuberculous pericarditis has declined. A recent series of 136 patients reported radiographic evidence of pericardial calcification in approximately one third of p ...
Print this article
... artery arises from the pulmonary artery usually from the left posterior facing sinus. Among the ALCAPAs, isolated origin of left anterior descending artery from the pulmonary artery [ALADPA] is extremely rare. In fetal life, since both pulmonary artery and coronary arteries are having same pressures ...
... artery arises from the pulmonary artery usually from the left posterior facing sinus. Among the ALCAPAs, isolated origin of left anterior descending artery from the pulmonary artery [ALADPA] is extremely rare. In fetal life, since both pulmonary artery and coronary arteries are having same pressures ...
Study of the cholinergic system in the heart and its potential
... The heart is one of the most frequently studied tissues. While at first sight its function seems simple, in deeper view it is a complicated and still relatively undiscovered organ. Moreover, cardiovascular diseases are one of the most often causes of death in human in middle age. Thus, new informati ...
... The heart is one of the most frequently studied tissues. While at first sight its function seems simple, in deeper view it is a complicated and still relatively undiscovered organ. Moreover, cardiovascular diseases are one of the most often causes of death in human in middle age. Thus, new informati ...
Correlation of Atrial Natriuretic Peptide and Cyclic
... reported earlier, the interassay CV was 12.2% (8). The assays of atrial natriuretic peptide and cGMP plasma concentrations were performed independently in two different laboratories without knowing the donor's health status or ventricular function. Patients and controls A total of 50 individuals, co ...
... reported earlier, the interassay CV was 12.2% (8). The assays of atrial natriuretic peptide and cGMP plasma concentrations were performed independently in two different laboratories without knowing the donor's health status or ventricular function. Patients and controls A total of 50 individuals, co ...
anomalous pulmonary venous drainage - Heart
... collect 100 reported cases; of these, 36 per cent had complete, and 64 per cent partial anomalous drainage, and among the latter, the right lung was involved in two-thirds of the cases, and an atrial septal defect was present in over half of those about which there was definite information. Instance ...
... collect 100 reported cases; of these, 36 per cent had complete, and 64 per cent partial anomalous drainage, and among the latter, the right lung was involved in two-thirds of the cases, and an atrial septal defect was present in over half of those about which there was definite information. Instance ...
as PDF
... inwardly rectifying Cl- channels have never been further characterized. Instead, a later study found that substitution of extracellular Cl- with larger anions including isethionate, glutamate, acetate, and aspartate, reduced the amplitude of If without changing the reversal potential and substitutio ...
... inwardly rectifying Cl- channels have never been further characterized. Instead, a later study found that substitution of extracellular Cl- with larger anions including isethionate, glutamate, acetate, and aspartate, reduced the amplitude of If without changing the reversal potential and substitutio ...
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.