Friday, February 21, 2014
Spinal Nerve Function : Online Medical Help
Spinal Nerve Function
The term spinal nerve generally refers to a mixed spinal nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. Humans have 31 left-right pairs of spinal nerves, each roughly corresponding to a segment of the vertebral column: 8 cervical spinal nerve pairs (C1-C8), 12 thoracic pairs (T1-T12), 5 lumbar pairs (L1-L5), 5 sacral pairs (S1-S5), and 1 coccygeal pair. The spinal nerves are part of theperipheral nervous system (PNS).
Saturday, February 1, 2014
Normal Blood Gases : Arterial Blood Gases : Online Medical Help
Arterial Blood Gases
Normal Blood Gases |
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Arterial | Venous | |
pH | 7.35 - 7.45 | 7.32 - 7.42 |
Not a gas, but a measurement of acidity or alkalinity, based on the hydrogen (H+) ions present. The pH of a solution is equal to the negative log of the hydrogen ion concentration in that solution: pH = - log [H+]. | ||
PaO2 | 80 to 100 mm Hg. | 28 - 48 mm Hg |
The partial pressure of oxygen that is dissolved in
arterial blood. New Born – Acceptable range 40-70 mm Hg. Elderly: Subtract 1 mm Hg from the minimal 80 mm Hg level for every year over 60 years of age: 80 - (age- 60) (Note: up to age 90) |
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HCO3 | 22 to 26 mEq/liter (21–28 mEq/L) |
19 to 25 mEq/liter |
The calculated value of the amount of bicarbonate in the bloodstream. Not a blood gas but the anion of carbonic acid. | ||
PaCO2 | 35-45 mm Hg | 38-52 mm Hg |
The amount of carbon dioxide dissolved in arterial blood. Measured. Partial pressure of arterial CO2. (Note: Large A= alveolor CO2). CO2 is called a “volatile acid” because it can combine reversibly with H2O to yield a strongly acidic H+ ion and a weak basic bicarbonate ion (HCO3 -) according to the following equation: CO2 + H2O <--- --> H+ + HCO3 | ||
B.E. | –2 to +2 mEq/liter Other sources: normal reference range is between -5 to +3. |
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The base excess indicates the amount of excess or
insufficient level of bicarbonate in the system.
(A negative base excess indicates a base deficit in the blood.) A
negative base excess is equivalent to an acid excess. A value outside of
the normal range (-2 to +2 mEq) suggests a metabolic cause for the
abnormality. Calculated value. The base excess is
defined as the amount of H+ ions that would be required to return the pH
of the blood to 7.35 if the pCO2 were adjusted to normal. It can be estimated by the equation: Base excess = 0.93 (HCO3 - 24.4 + 14.8(pH - 7.4)) Alternatively: Base excess = 0.93×HCO3 + 13.77×pH - 124.58 A base excess > +3 = metabolic alkalosis a base excess < -3 = metabolic acidosis |
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SaO2 | 95% to 100% | 50 - 70% |
The arterial oxygen saturation. |
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