Intracranial Pressure

Intracranial pressure (ICP) is the pressure inside the skull and thus in the brain tissue and cerebrospinal fluid (CSF). The body has various mechanisms by which it keeps the ICP stable, with CSF pressures varying by about 1 mmHg in normal adults through shifts in production and absorption of CSF. CSF pressure has been shown to be influenced by abrupt changes in intrathoracic pressure during coughing (intraabdominal pressure), valsalva (Queckenstedt's maneuver), and communication with the vasculature (venous and arterial systems). ICP is measured in millimeters of mercury (mmHg) and, at rest, is normally 7–15 mmHg for a supine adult, and becomes negative (averaging −10 mmHg) in the vertical position. Changes in ICP are attributed to volume changes in one or more of the constituents contained in the cranium.

Intracranial hypertension, commonly abbreviated IH, IICP or raised ICP, is elevation of the pressure in the cranium. ICP is normally 7–15 mm Hg; at 20–25 mm Hg, the upper limit of normal, treatment to reduce ICP may be needed.

Read more about Intracranial Pressure:  The Monro-Kellie Hypothesis, Increased ICP, Low ICP

Other articles related to "intracranial pressure, pressure, intracranial":

Cushing Reflex - Differential Diagnosis
... brain, there is always a likelihood that raised intracranial pressure may occur ... As first postulated by Harvey Cushing, raised intracranial pressure is the primary cause of the Cushing reflex ... Furthermore, continued moderate increases in cranial pressure allows for the Cushing reflex to occur ...
Cushing Reflex - History - Experimental Setup and Results
... to similarly test the effects of brain pressure on sinus pressure, cerebrospinal fluid pressure, arterial and venous blood pressure ... Intracranial pressure was raised by filling an intracranial, soft, rubber bag with mercury ... Cushing recorded the intracranial pressure along with blood pressure, pulse rate, and respiratory rate simultaneously ...
Brain Herniation
... Brain herniation is a deadly side effect of very high intracranial pressure that occurs when a part of the brain is squeezed across structures within ... Herniation can be caused by a number of factors that cause a mass effect and increase intracranial pressure (ICP) these include traumatic brain injury, intracranial hemorrhage, or brain tumor ... In such cases local pressure is increased at the place where the herniation occurs, but this pressure is not transmitted to the rest of the brain ...
Cerebral Perfusion Pressure - Definitions - By Intracranial Pressure
... An alternative definition of CPP is where MAP is mean arterial pressure ICP is intracranial pressure This definition may be more appropriate if considering the circulatory system in the brain as a Starling resistor ... specifically, the cerebral perfusion pressure can be defined as either (if ICP is higher than JVP) orL (if JVP is higher than ICP) ... Physiologically, increased intracranial pressure (ICP) causes decreased blood perfusion of brain cells by mainly two mechanisms Increased ICP constitutes an ...
Intracranial Pressure - Low ICP
... It is also possible for the intracranial pressure to drop below normal levels, though increased intracranial pressure is a far more common (and far more serious) sign ... are often the same, leading many medical experts to believe that it is the change in pressure rather than the pressure itself causing the above symptoms ... Spontaneous intracranial hypotension may occur as a result of an occult leak of CSF into another body cavity ...

Famous quotes containing the word pressure:

    Much of the pressure contemporary parents feel with respect to dressing children in designer clothes, teaching young children academics, and giving them instruction in sports derives directly from our need to use our children to impress others with our economic surplus. We find “good” rather than real reasons for letting our children go along with the crowd.
    David Elkind (20th century)