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The conduction system consists of specialized heart muscle cells, situated within the myocardium. [3] There is a skeleton of fibrous tissue that surrounds the conduction system which can be seen on an ECG. Dysfunction of the conduction system can cause irregular heart rhythms including rhythms that are too fast or too slow.
An increase in sympathetic stimulation to the heart increases contractility and heart rate. An increase in contractility tends to increase stroke volume and thus a secondary increase in preload. An increase in preload results in an increased force of contraction by Starling's law of the heart; this does not require a change in contractility.
What Causes Heart Disease? The causes of heart disease depend on the type you have. For instance, unhealthy lifestyle habits can contribute to the plaque buildup that leads to coronary artery disease.
The main pathophysiology of heart failure is a reduction in the efficiency of the heart muscle, through damage or overloading. As such, it can be caused by a wide number of conditions, including myocardial infarction (in which the heart muscle is starved of oxygen and dies), hypertension (which increases the force of contraction needed to pump blood) and cardiac amyloidosis (in which misfolded ...
Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; myocardium structure; the electrical conduction system of the heart; the cardiac cycle and cardiac output and how these interact and depend on one another.
Premature ventricular contractions may be associated with underlying heart disease, and certain characteristics are therefore elicited routinely: the presence of signs of heart disease or a known history of heart disease (e.g. previous myocardial infarction), as well as heart disease or sudden cardiac death in close relatives.
“Nearly half of all U.S. adults have some form of cardiovascular disease, and it remains the leading cause of death,” she says. ... heart disease. It’s “very common,” says Suzanne ...
Feline hypertrophic cardiomyopathy (HCM) is the most common heart disease in domestic cats; [69] [70] [71] the disease process and genetics are believed to be similar to the disease in humans. [72] In Maine Coon cats, HCM has been confirmed as an autosomal dominant inherited trait. [73] Numerous cat breeds have HCM as a problem in the breed. [74]