autoregulation


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Related to autoregulation: heterometric autoregulation

autoregulation

 [aw″to-reg″u-la´shun]
control of certain phenomena by factors inherent in a situation; specifically, (1) maintenance by an organ or tissue of a constant blood flow despite changes in arterial pressure, and (2) adjustment of blood flow through an organ in accordance with its metabolic needs.
heterometric autoregulation those intrinsic mechanisms controlling the strength of ventricular contractions that depend on the length of myocardial fibers at the end of diastole.
homeometric autoregulation those intrinsic mechanisms controlling the strength of ventricular contractions that are independent of the length of myocardial fibers at the end of diastole.

au·to·reg·u·la·tion

(aw'tō-reg'yū-lā'shŭn),
1. The tendency of the blood flow to an organ or part to remain at or return to the same level despite changes in the pressure in the artery that conveys blood to it.
2. In general, any biologic system equipped with inhibitory feedback systems such that a given change tends to be largely or completely counteracted; for example, baroreceptor reflexes form a basis for autoregulation of the systemic arterial blood pressure.

autoregulation

/au·to·reg·u·la·tion/ (-reg″u-la´shun)
1. the process occurring when some mechanism within a biological system detects and adjusts for changes within the system.
2. in circulatory physiology, the intrinsic tendency of an organ or tissue to maintain constant blood flow despite changes in arterial pressure, or the adjustment of blood flow through an organ in accordance with its metabolic needs.

heterometric autoregulation  intrinsic mechanisms controlling the strength of ventricular contractions that depend on the length of myocardial fibers at the end of diastole.
homeometric autoregulation 
1. intrinsic mechanisms controlling the strength of ventricular contractions that are independent of the length of myocardial fibers at the end of diastole.

autoregulation

Etymology: Gk, autos, self; L, regula, rule
an intrinsic capacity of organs to regulate their own blood flow or metabolic activity. The former process results from the contraction or relaxation of self-excitable smooth muscle, which causes the constriction or dilation of vessels. It allows organs to maintain constant blood flow and meet their metabolic needs despite variations in systemic arterial pressure.

autoregulation

A general term for a locally controlled feedback process—e.g., the regulation of a gene encoding a transcription factor by its own gene product.

au·to·reg·u·la·tion

(aw'tō-reg-yū-lā'shŭn)
1. The tendency of the blood flow to an organ or part to remain at or return to the same level despite changes in the pressure in the artery which conveys blood to it.
2. In general, any biologic system equipped with inhibitory feedback systems such that a given change tends to be largely or completely counteracted; e.g., baroreceptor reflexes form a basis for autoregulation of the systemic arterial blood pressure.

autoregulation

negative-feedback systems that counteract or inhibit change and maintain the status quo

autoregulation,

n 1. self-adjustment.
2. inherent capability to adjust one's own physiology. See also homeostasis and naturopathy.

autoregulation

control of certain phenomena by factors inherent in a situation; specifically, (1) maintenance by an organ or tissue of a constant blood flow despite changes in arterial pressure, and (2) adjustment of blood flow through an organ in accordance with its metabolic needs.

heterometric autoregulation
those intrinsic mechanisms controlling the strength of ventricular contractions that depend on the length of myocardial fibers at the end of diastole.
homeometric autoregulation
those intrinsic mechanisms controlling the strength of ventricular contractions that are independent of the length of myocardial fibers at the end of diastole.
References in periodicals archive ?
The lower blood pressure autoregulation threshold is 30 mm Hg or less.
Prostaglandin biosynthesis, transport, and signaling in corpus luteum: a basis for autoregulation of luteal function.
Since chronic hypertension shifts cerebral and renal perfusion autoregulation to a higher level, the brain and kidneys are prone to hypoperfusion with rapid decrease in blood pressure.
Propofol total intravenous anesthesia (TIVA) maintains cerebral blood flow autoregulation and is considered superior to inhalant agents as an anesthetic protocol for patients with intracranial lesions.
Impaired cerebral autoregulation and brain injury in newborns with hypoxicischemic encephalopathy treated with hypothermia.
2] This syndrome is a clinico-neuroimaging entity and is hypothesised to be related to impaired cerebral blood flow autoregulation that leads to either over- or under-perfusion of the brain.
It is considered that PRES is caused by the disorder of the autoregulation of the central nervous system vasculature.
Age, intracranial pressure, autoregulation, and outcome after brain trauma.
4) PRES occurs when endothelial dysfunction or failure of the cerebral autoregulation leads to cerebral edema, (5) and can cause seizures, headache, nausea, vomiting, altered mental status, and visual disturbances.
The CSF also serves a vital function in cerebral autoregulation of cerebral blood flow.

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