The thick left ventricular wall of the giraffe heart normalises wall
... such massive arterial pressures. We hypothesized that giraffe hearts have a small intraventricular cavity and a relatively thick ventricular wall, allowing for generation of high arterial pressures at normal left ventricular wall tension. In nine anaesthetized giraffes (495±38 kg), we determined in ...
... such massive arterial pressures. We hypothesized that giraffe hearts have a small intraventricular cavity and a relatively thick ventricular wall, allowing for generation of high arterial pressures at normal left ventricular wall tension. In nine anaesthetized giraffes (495±38 kg), we determined in ...
A Patient Guide To Electrophysiology Study And Catheter Ablation
... rhythms, or supraventricular tachycardias. For most supraventricular tachycardias, the success rate for catheter ablation is greater than 90% and can result in a permanent cure. For these reasons catheter ablation has become the first choice for treatment of many supraventricular arrhythmias, preven ...
... rhythms, or supraventricular tachycardias. For most supraventricular tachycardias, the success rate for catheter ablation is greater than 90% and can result in a permanent cure. For these reasons catheter ablation has become the first choice for treatment of many supraventricular arrhythmias, preven ...
21_ClickerQuestionsPRS
... c. The internal organization of the left ventricle resembles that of the right ventricle, which contains more prominent trabeculae carneae. d. There are two large papillary muscles, rather than three, which are associated with a moderator band. ...
... c. The internal organization of the left ventricle resembles that of the right ventricle, which contains more prominent trabeculae carneae. d. There are two large papillary muscles, rather than three, which are associated with a moderator band. ...
The prospective effect of lipoprotein (a) on new
... Prognostic impacts of Lp(a) in new AF with CHF To pre-existing CHF patients, new-onset AF were considered to be associated with poor prognosis. Wang et al examined 1,470 individuals in a Framingham Heart Study and demonstrated that new on-set AF increased mortality in CHF subjects [3]. In a new rece ...
... Prognostic impacts of Lp(a) in new AF with CHF To pre-existing CHF patients, new-onset AF were considered to be associated with poor prognosis. Wang et al examined 1,470 individuals in a Framingham Heart Study and demonstrated that new on-set AF increased mortality in CHF subjects [3]. In a new rece ...
Chapter 1: The cardiac pacemaker and conduction system develops
... the experimental data could also be interpreted as if precursor cells differentiate into either working myocardium or conduction system myocardium that subsequently further proliferates. This specification model, however, was considered unlikely, because earlier experiments revealed withdrawal of co ...
... the experimental data could also be interpreted as if precursor cells differentiate into either working myocardium or conduction system myocardium that subsequently further proliferates. This specification model, however, was considered unlikely, because earlier experiments revealed withdrawal of co ...
Automatic Heart Sound Signal Analysis with
... The continuous characterization of the heart function and its change in dynamics is an important clinical problem to detect critical variations and eventually improve the treatment of patients admitted with heart problems. A low-cost, noninvasive alternative to electrocardiography (ECG) is to descri ...
... The continuous characterization of the heart function and its change in dynamics is an important clinical problem to detect critical variations and eventually improve the treatment of patients admitted with heart problems. A low-cost, noninvasive alternative to electrocardiography (ECG) is to descri ...
Contraindications to vasoconstrictors in dentistry
... quantity of local anesthetic with vasoconstrictor can lead to significant increase in cardiac stroke volume and oxygen consumption. Regardless of the risk associated with an accidental intravenous injection, there is no certainty that such hemodynamic changes could not compromise the cardiovascular ...
... quantity of local anesthetic with vasoconstrictor can lead to significant increase in cardiac stroke volume and oxygen consumption. Regardless of the risk associated with an accidental intravenous injection, there is no certainty that such hemodynamic changes could not compromise the cardiovascular ...
University of Groningen Measuring physical fitness in persons
... Background As physical fitness is related to physical activity, it is important to gain insight into the physical activity levels of persons with Profound Intellectual and Multiple Disabilities (PIMD). Heart rate monitoring may be used as an indicator of activity levels, yet a correct method for dat ...
... Background As physical fitness is related to physical activity, it is important to gain insight into the physical activity levels of persons with Profound Intellectual and Multiple Disabilities (PIMD). Heart rate monitoring may be used as an indicator of activity levels, yet a correct method for dat ...
Tumor Necrosis Factor-Alpha and Inflammation
... inflammation, and cell death. TNF-α is important in initiating and regulating the cytokine cascade during an inflammatory response. Most of the studies focused on the TNF-α as an immune mediator but its function in cardiac cells is not well defined. This review focuses on the role of TNF-α in acute ...
... inflammation, and cell death. TNF-α is important in initiating and regulating the cytokine cascade during an inflammatory response. Most of the studies focused on the TNF-α as an immune mediator but its function in cardiac cells is not well defined. This review focuses on the role of TNF-α in acute ...
Left ventricular volumes and hemodynamic responses to
... (same stroke volume with higher afterload) as a consequence of an increased EDV, i.e., increased preload, eliciting the Frank-Starling mechanism. The conclusion that ventricular performance, and not necessarily myocardial contractility, is increased during OCCL could also apply to the results from B ...
... (same stroke volume with higher afterload) as a consequence of an increased EDV, i.e., increased preload, eliciting the Frank-Starling mechanism. The conclusion that ventricular performance, and not necessarily myocardial contractility, is increased during OCCL could also apply to the results from B ...
Cardiopulmonary Physiology
... • Next is the electrocardiogram, a recording made at the skin surface, of the electrical events of the heart. It is a surface recording that ‘sums’ all of the action potentials of individual muscle fibers. The P wave corresponds to the electrical depolarization that takes place just before atrial co ...
... • Next is the electrocardiogram, a recording made at the skin surface, of the electrical events of the heart. It is a surface recording that ‘sums’ all of the action potentials of individual muscle fibers. The P wave corresponds to the electrical depolarization that takes place just before atrial co ...
Print this article - International Journal of Reproduction
... and affect the effectiveness of the heart such as pressure on the heart resulting tamponade effect. Conclusions: Cardiac changes due to the insistence by CDH can lead to changes position, anatomical and cardiac function. Keywords: CDH, Complication, Fetal heart INTRODUCTION Diaphragmatic hernia was ...
... and affect the effectiveness of the heart such as pressure on the heart resulting tamponade effect. Conclusions: Cardiac changes due to the insistence by CDH can lead to changes position, anatomical and cardiac function. Keywords: CDH, Complication, Fetal heart INTRODUCTION Diaphragmatic hernia was ...
Happy heart syndrome
... evolving evidence suggests that TTS is typically precipitated by episodes of severe negative stress such as grief, anger, or fear.2,3 These negative emotional triggers have led to the popular term ‘broken heart syndrome’.4 It is well known that emotional distress may result in an overstimulation of ...
... evolving evidence suggests that TTS is typically precipitated by episodes of severe negative stress such as grief, anger, or fear.2,3 These negative emotional triggers have led to the popular term ‘broken heart syndrome’.4 It is well known that emotional distress may result in an overstimulation of ...
An Automated External Defibrillator (AED) is a
... to when the defibrillation shock is delivered. On average it takes EMS teams an average of 6 to 12 minutes to arrive. That's why having an AED readily accessible wherever groups of people gather makes good preventative sense. Unfortunately not every emergency vehicle carries a defibrillator, the onl ...
... to when the defibrillation shock is delivered. On average it takes EMS teams an average of 6 to 12 minutes to arrive. That's why having an AED readily accessible wherever groups of people gather makes good preventative sense. Unfortunately not every emergency vehicle carries a defibrillator, the onl ...
Brugada - Masonic Medical Research Laboratory
... the inheritance of traits including disease. We have approximately 20,000 - 25,000 genes in our bodies that encode for proteins responsible for the function of our organs. An error in the genetic code can cause the proteins to malfunction, thus causing disease. Understanding disease at the genetic l ...
... the inheritance of traits including disease. We have approximately 20,000 - 25,000 genes in our bodies that encode for proteins responsible for the function of our organs. An error in the genetic code can cause the proteins to malfunction, thus causing disease. Understanding disease at the genetic l ...
View/Open - SUST Repository
... frequency of 25 to 45 Hz. It is soft when the heart rate is low, because the ventricles are well filled with blood and the leaflets of the AV valves float together before systole. The second sound lasts about 0.12 s, with a frequency of 50 Hz. It is loud and sharp when the diastolic pressure in the ...
... frequency of 25 to 45 Hz. It is soft when the heart rate is low, because the ventricles are well filled with blood and the leaflets of the AV valves float together before systole. The second sound lasts about 0.12 s, with a frequency of 50 Hz. It is loud and sharp when the diastolic pressure in the ...
91410 - Priority Health
... ventricular fibrillation, and a small percentage of sudden infant death syndrome. Approximately five (5) million people in the United States have heart failure and over 550,000 are diagnosed annually for the first time. Heart failure is the primary reason for 12 to 15 million-office visits each year ...
... ventricular fibrillation, and a small percentage of sudden infant death syndrome. Approximately five (5) million people in the United States have heart failure and over 550,000 are diagnosed annually for the first time. Heart failure is the primary reason for 12 to 15 million-office visits each year ...
Comprehensive multilevel in vivo and in vitro analysis of heart rate
... and heart failure, as well as in noncardiac conditions, including diabetic autonomic neuropathy, stroke, sepsis and cancer34,35. Low HRV has been identified as an independent predictor of high risk for sudden and non-sudden cardiac deaths36–39. In many of the specified conditions, the mechanisms und ...
... and heart failure, as well as in noncardiac conditions, including diabetic autonomic neuropathy, stroke, sepsis and cancer34,35. Low HRV has been identified as an independent predictor of high risk for sudden and non-sudden cardiac deaths36–39. In many of the specified conditions, the mechanisms und ...
App For Improving Heart Rate Monitor Based Endurance
... minutes with sonification. Every time the heart rate monitor sends a packet, the heart rate is logged in a database along with its timestamp. From this data the amount of time spent outside of the given zones is extracted and the different tests are compared to each other. More precisely the app doe ...
... minutes with sonification. Every time the heart rate monitor sends a packet, the heart rate is logged in a database along with its timestamp. From this data the amount of time spent outside of the given zones is extracted and the different tests are compared to each other. More precisely the app doe ...
A1984RY18900001
... order to foster research in myocardial infarction. The original proposal, with Charles Sanders as the principal investigator, included a request to study the syndrome of cardiogenic shock. This portion of the proposal was written by J.B. Caulfield, who had described the ultrastructure of ischemic my ...
... order to foster research in myocardial infarction. The original proposal, with Charles Sanders as the principal investigator, included a request to study the syndrome of cardiogenic shock. This portion of the proposal was written by J.B. Caulfield, who had described the ultrastructure of ischemic my ...
Circulation and the design of cardiovascular (CV
... control, hemostasis). This first lecture will introduce the cardiovascular (CV) topic and discuss the heart as a pump. ! The sections for this lecture are:! Introduction to the CV system ...
... control, hemostasis). This first lecture will introduce the cardiovascular (CV) topic and discuss the heart as a pump. ! The sections for this lecture are:! Introduction to the CV system ...
DEVELOPING A MODEL THREE-DIMENSIONAL ANIMATION OF
... goal of this thesis was to develop a technique for easily altering 3D animations using 2D methods. To reflect current research, two-dimensional animation methods can be employed to quickly build or update the 3D animation. This technique allows researchers to use the same model to visualize multiple ...
... goal of this thesis was to develop a technique for easily altering 3D animations using 2D methods. To reflect current research, two-dimensional animation methods can be employed to quickly build or update the 3D animation. This technique allows researchers to use the same model to visualize multiple ...
Acute Myocardial Infarction/Complications
... presence and extent of inducible ischemia in patients who have not had coronary angiography and do not have high-risk clinical features for which coronary angiography would be warranted (LOE: B). Echocardiography is reasonable to clarify the diagnosis of STEMI and allow risk stratification of patien ...
... presence and extent of inducible ischemia in patients who have not had coronary angiography and do not have high-risk clinical features for which coronary angiography would be warranted (LOE: B). Echocardiography is reasonable to clarify the diagnosis of STEMI and allow risk stratification of patien ...
Academic paper: Reversing Heart Failure: Diastolic Recoil in a
... CHF is classified as either systolic dysfunction (failure of the ventricles to adequately eject blood) CHF or diastolic dysfunction CHF. Diastolic dysfunction—or failure of the ventricles to properly fill—is the sole cause of CHF for 40-60% [2] of the nearly 5 million Americans suffering from the di ...
... CHF is classified as either systolic dysfunction (failure of the ventricles to adequately eject blood) CHF or diastolic dysfunction CHF. Diastolic dysfunction—or failure of the ventricles to properly fill—is the sole cause of CHF for 40-60% [2] of the nearly 5 million Americans suffering from the di ...
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.