noun. overcrowding; clogging: severe traffic congestion. an excessive or abnormal accumulation of blood or other fluid in a body part or blood vessel: pulmonary congestion.
What is the difference between hyperemia and congestion?
Hyperemia is an active process that is part of acute inflammation, whereas congestion is the passive process resulting from decreased outflow of venous blood, as occurs in congestive heart failure (Fig. 9-56).
Why is congestion passive?
Passive congestion is due either to high blood pressure in the capillaries, caused by a cardiac disorder, or to relaxation of the blood capillaries followed by blood seepage.
What is hyperemia pathology?
Hyperemia occurs when excess blood builds up inside the vascular system, which is the system of blood vessels in the body. When excess blood occurs outside the vascular system, due to a broken blood vessel or injury, this is known as hemorrhage. The buildup of blood may present as a red, warm, painful, swollen area.
What is road congestion?
In the transportation realm, congestion usually relates to an excess of vehicles on a portion of roadway at a particular time resulting in speeds that are slowersometimes much slowerthan normal or free flow speeds. Congestion often means stopped or stop-and-go traffic.
What is congestion in skin?
Congestion is the build-up of dead skin cells, sweat, impurities, and sebum in the pores. As this debris builds up, if it’s unable to leave the skin it becomes trapped and leads to blackheads, uneven skin texture and a dull appearance.
What causes active hyperemia and active hyperemia?
Active hyperemia is caused by an increased flow of blood into your organs. It usually happens when organs need more blood than usual. Your blood vessels widen to increase the supply of blood flowing in.
What is passive congestion?
Medical Definition of passive congestion : congestion caused by obstruction to the return flow of venous blood. called also passive hyperemia.
What is the difference between active and reactive hyperemia?
Reactive hyperemia is the blood flow re- sponse to blood flow occlusion, whereas active hyperemia is the blood flow response to increased tissue metabolic activity.
What is acute pulmonary congestion?
Pulmonary congestion is defined as accumulation of fluid in the lungs, resulting in impaired gas exchange and arterial hypoxemia. It occurs sequentially, first developing in the hilar region of the lungs, followed by filling of the interstitial space and finally, in its most severe form, by alveolar flooding.
What is central vascular congestion?
Vascular congestion is the engorgement of an entity, such as the blood vessels of the erectile tissues, with blood. It is known to occur with deep venous thrombosis (DVT).
What is bilateral basal congestion?
Basal congestion: This is gravity dependent accumulation of fluid in the lungs and alveoli are filled with fluid. Fuzzy full hilum: Represents enlarged pulmonary veins and fluid around them. Bilateral pleural effusions. Due to increased hydrostatic pressures.
What is tissue congestion?
Definition. A finding indicating the presence of increased blood volume in the vascular lumen. [ from NCI]
What is inflammatory hyperemia?
Redness and heat in inflammation is caused by extra blood flow and volume, called inflammatory hyperemia. In animal research, hyperemia predicted sites of experimentally induced cancer.
What is pulp hyperemia?
There are two forms of pulp hyperemia: arterial and venous. When the. pulp in a tooth is disturbed as in case of thermal shock, the vasodilators bring. about dilatation of the capillaries which by their expansion cause pressure on. the nerves and pain follows.
What is congestion in transportation?
Congestion occurs when the amount of traffic exceeds the design capacity, which is commonly the place during the morning and the afternoon peak hours. An issue relates to the level of capacity that should be provided considering the daily distribution of traffic.
What causes road congestion?
Congestion occurs when traffic on the road is delayed due to the presence of other vehicles. … Congestion is a result of an imbalance of the travel demand and the transport system supply. The demand results from the concentration of travel in space and time.
How is congestion measured?
Congestion Measures can be subdivided into Mobility Measures and Reliability Measures. These are the five most common measures for mobility: Volume-to-Capacity Ratio (V/C Ratio): the volume divided by capacity. … Percent of Congested Travel: the congested vehicle-miles of travel divided by total vehicle-miles of travel.
What causes skin congestion?
Congested skin is often more prone to acne and clogged pores. It can be caused by dead skin cell buildup, exposure to irritants, or even an allergic reaction to makeup.
What are signs of congestion in skin?
If your skin is congested, you might notice bumpiness underneath the skin, blackheads, small whiteheads, breakouts and a general dull appearance.
How can I decongest my skin?
6 Ways To Unclog Your Pores For Good, According To Dermatologists
- Use salicylic acid. …
- Mask with charcoal or clay once a week. …
- Invest in a comedone extractor. …
- Use retinol in your routine. …
- Indulge in a weekly pore strip. …
- Opt for in-office acne facials.
Is hyperemia an active process?
Hyperemia is an active process that is part of acute inflammation, whereas congestion is the passive process resulting from decreased outflow of venous blood, as occurs in congestive heart failure (Fig.
Which of the following is an example of active hyperemia?
An example of active hyperemia is the increase in blood flow that accompanies muscle contraction, which is also called exercise or functional hyperemia in skeletal muscle.
What is myogenic autoregulation?
The myogenic theory of autoregulation states that an intrinsic property of the blood vessel, or more specifically, vascular smooth muscle, regulates vascular tone in response to changes in intraluminal pressure.
What is parenchymal congestion?
Passive hepatic congestion is caused by stasis of blood within the liver parenchyma due to compromise of hepatic venous drainage.
What is acute hepatic congestion?
Acute Hepatic Congestion is an acute consequence of right heart failure. Initially, congestion affects the areas surrounding the terminal hepatic venule where blood usually exits the classically-conceived hepatic lobule] or in Zone III of the acinus-model of the hepatic lobule (See: Hepatic Histology).
What is Cardiohepatic?
The term cardiohepatic syndrome covers a complex series of interactions between the heart and the liver. It can be divided into five types, according to which organ presents the primary damage, and the time of its establishment. Specifically, type 1 cardiohepatic syndrome is characterized by acute heart failure.
What is hyperaemia and its causes?
Hyperemia is the increase of blood to your organs. There are two types of hyperemia. The causes of hyperemia include exercise, digestion, fever, hot flashes, injury and infection, heart failure, and thrombosis. Hyperemia is the increase of blood to your organs.
What is blood flow autoregulation?
Autoregulation is the intrinsic capacity of resistance vessels in end organs, such as heart, kidney, and brain, to dilate and constrict in response to dynamic perfusion pressure changes, maintaining blood flow relatively constant (Figure).
What is the physiological significance of reactive hyperemia?
Reactive hyperaemia, a sub-category of arterial hyperaemia, is the transient increase in organ blood flow that occurs following a brief period of ischaemia. Following ischaemia there will be a shortage of oxygen and a build-up of metabolic waste.