What is ventricular wall tension?
Ventricular wall tension is based on the thickness of the ventricular myocardium. The law of Laplace states that ventricular wall tension is proportional to ventricular radius and intraventricular pressure. Patients with coronary artery disease will have decreased blood and oxygen supply to the myocardium.
What is cardiac wall tension?
Introduction: Wall stress or wall tension is a conception derived from physics (Laplace’s law) and represents the systolic force or work per surface unit. It is the systolic force made by myocardial tissues. Stress increase indicates enlargement of the left ventricle or increase of intracavitary pressure.
What is systolic wall stress?
Left ventricular end-systolic wall stress (ESWS) or afterload as a measure of myocardial function is based on the principle that, for equilibrium to exist at any point of the cardiac cycle, the forces acting within the ventricular wall must exactly balance the force acting on the wall.
What is myocardial tension?
Myocardial wall tension or more correctly meridional wall stress (stress = tension divided by area) is one of the most critical determinants of MVO2 and is determined by the Laplace relation, i.e., depends on ventricular systolic pressure, ventricular radius, and is inversely related to ventricular wall thickness [2].
What is Laplace’s law?
Simply stated the Law of Laplace says that the tension in the walls of a container is dependent on both the pressure of the container’s contents and its radius. If the pressure in a vessel is increased, we expect the wall tension to increase.
Why does Wall tension increase with radius?
Why does wall tension increase with radius? If the upward part of the fluid pressure remains the same, then the downward component of the wall tension must remain the same. But if the curvature is less, then the total tension must be greater in order to get that same downward component of tension.
What is Laplace’s Law of the heart?
The Law of LaPlace describes the factors that determine left ventricular wall stress, which is a major determinant of myocardial oxygen demand. Enlarge. Left ventricular wall stress is the force acting against the myocardial cells. This is directly proportional to the left ventricular pressure and radius.
What is Laplace’s Law?
How do you measure wall tension?
Background: LaPlace’s law determines the wall tension of a tubular system by measuring the radius (r), wall thickness (w), and pressure gradient of a tubular structure: wall tension = pressure gradient x r/w.
What is the equation for Laplace’s law?
Laplace’s law as it applies to bubbles of unequal radius attached to a Y-tube. The pressure (P) in a bubble is equal to 4 times the surface tension (T) divided by the radius (r). As applied to the grape-like alveolus, where only the inner wall has a liquid surface exposed to gas, the formula is P = 2T/r.
What is myocardial wall?
The myocardium, or cardiac muscle, is the thickest section of the heart wall and contains cardiomyocytes, the contractile cells of the heart. As a type of muscle tissue, the myocardium is unique among all other muscle tissues in the human body.
What is myocardial wall stress?
What is the medical definition of an intramyocardial injection?
Medical Definition of intramyocardial. : situated within, occurring within, or administered by entering the myocardium an intramyocardial injection.
How is wall tension related to ventricular radius?
The LaPlace relationship says that wall tension (T) is proportional to the product of intraventricular pressure (P) and ventricular radius (r). Wall tension can be thought of as the tension generated by myocytes that results in a given intraventricular pressure at a particular ventricular radius.
What is the medical definition of muscular tension?
Medical Definition of tension. 1a : the act or action of stretching or the condition or degree of being stretched to stiffness muscular tension. b : stress sense 1b. 2a : either of two balancing forces causing or tending to cause extension. b : the stress resulting from the elongation of an elastic body.
What’s the best definition of tension for kids?
Kids Definition of tension. 1 : the act of straining or stretching : the condition of being strained or stretched I adjusted the strap’s tension. 3 : a state of unfriendliness There was tension between the two groups.