isotonic


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isotonic

 [i″so-ton´ik]
1. of equal tension.
2. denoting a solution in which body cells can be bathed without net flow of water across the semipermeable cell membrane; also, denoting a solution having the same tonicity as another solution with which it is compared.

i·so·ton·ic

(ī'sō-ton'ik),
1. Relating to isotonicity or isotonia.
2. Having equal tension; denoting solutions possessing the same osmotic pressure; more specifically, limited to solutions in which cells neither swell nor shrink. Thus, a solution that is isosmotic with intracellular fluid will not be isotonic if it includes solute, such as urea, that freely permeates cell membranes.
3. In physiology, denoting the condition when a contracting muscle shortens against a constant load, as when lifting a weight. Compare: auxotonic, isometric (2).

isotonic

/iso·ton·ic/ (-ton´ik)
1. denoting a solution in which body cells can be bathed without net flow of water across the semipermeable cell membrane.
2. denoting a solution having the same tonicity as another solution with which it is compared.
3. maintaining uniform tonus.

isotonic

(ī′sə-tŏn′ĭk)
adj.
1. Of equal tension.
2. Isosmotic.
3. Having the same concentration of solutes as the blood: an isotonic saline solution.
4. Physiology Of or involving muscular contraction in which the muscle remains under relatively constant tension while its length changes.

i′so·ton′i·cal·ly adv.
i′so·to·nic′i·ty (-tə-nĭs′ĭ-tē) n.

isotonic

[ī′səton′ik]
Etymology: Gk, isos + tonikos, stretching
pertaining to a solution that causes no change in cell volume.

isotonic

Physiology
adjective Referring to uniformity of osmotic pressure.
 
Sports medicine
adjective Referring to a uniform muscle tone.
 
noun Isotonic drink, see there.

isotonic

adjective
1. Referring to a uniform muscle tone.
2. Referring to uniformity of osmotic pressure noun Isotonic drink, see there.

i·so·ton·ic

(ī'sō-ton'ik)
1. Relating to isotonicity or isotonia.
2. Having equal tension; denoting solutions possessing the same osmotic pressure; more specifically, limited to solutions in which cells neither swell nor shrink. Thus, a solution that is isosmotic with intracellular fluid will not be isotonic if it includes solute, such as urea, which freely permeates cell membranes.
3. physiology Denoting the condition when a contracting muscle shortens against a constant load, as when lifting a weight.
Compare: auxotonic, isometric (2)

isotonic

Of a fluid that exerts the same OSMOTIC PRESSURE as another, especially as that of the body fluids. Body cells, such as red blood cells, can be immersed in an isotonic solution without being caused to change shape. ‘Normal’ saline is isotonic with blood.

isotonic

(of a liquid) having a fluid state with the same WATER POTENTIAL as another liquid. See HYPOTONIC and Fig. 193 .

isotonic

same osmotic pressure as body fluids

isotonic (īˈ·sō·tˑ·nik),

n muscle contraction that involves change in the muscle length.

i·so·ton·ic

(ī'sō-ton'ik)
1. Relating to isotonicity or isotonia.
2. Having equal tension; denoting solutions possessing the same osmotic pressure.
3. In physiology, denoting the condition when a contracting muscle shortens against a constant load.

isotonic (ī´sōton´ik),

adj equivalence in osmotic pressure. Specifically used in reference to a solution whose osmotic pressure is equal to that of a body fluid, such as blood plasma or tears, to which the solution is compared.
isotonic muscle contraction,

isotonic

1. of equal tension.
2. denoting a solution in which body cells can be bathed without net flow of water across the semipermeable cell membrane; also, denoting a solution having the same tonicity as another solution with which it is compared.

isotonic contraction
muscle contraction without appreciable change in the force of contraction; the distance between the muscle's origin and insertion becomes lessened.
isotonic dehydration
occurs when the fluid lost is isotonic with serum, as in sweating, simple enteritis, nephrosis. There are therefore no errors of electrolyte balance likely to result.
isotonic saline
see normal saline.
References in periodicals archive ?
The patient's clinical presentation was consistent with a UTI, determined to be nosocomial, associated with the use of a contaminated isotonic solution.
This study showed no significant difference in BP after a single bout of 20-min isotonic handgrip exercise at 30% MVC.
Isotonic solutions are appropriate for patients suffering from extracellular fluid deficits such as in hemorrhaging or hypovolemic shock.
Isotonic exercise has shown to be functional and play a major role in day to day activities.
Peak RMS EMG from the isotonic condition was taken between the onset of the EMG activity to the cessation of the activity.
Post-operative use of isotonic fluid in children undergoing surgical correction of scoliosis (N = 24) helps prevent hyponatremia.
The other outcomes assessed included acute renal failure requiring dialysis, mortality, urinary pH after the administration of the isotonic sodium bicarbonate and absolute change in serum creatinine concentration and creatinine clearance (measured or estimated) from the baseline.
There were no significant differences in the incidence of C-sections or instrumental vaginal deliveries among the intervention patients, who were encouraged to drink 200 mL/hr of a clear isotonic liquid containing a 6% carbohydrate concentration, and the control patients, who were limited to 30 mL/hr of water (standard practice at the hospital).
Traditionally, heparin has been added to isotonic sodium chloride solution or 5% dextrose in water for use in maintaining patency of pressure monitoring catheters including arterial, pulmonary artery, and central venous pressure catheters.
This is due to two factors: 1) all such drinks are hypotonic (<135 mmol/L), and therefore will cause dilution of serum [Na+] if water is retained in the body to excess; and 2) it is well known that even administration of isotonic saline will not increase serum [Na+] in hyponatremic patients with the syndrome of inappropriate antidiuretic hormone secretion (SIADH) because in a euvolemic or hypervolemic state, the infused sodium will be excreted in the urine rather than retained (65).
Because rapid fluid replacement with hypotonic solutions carries an increased risk of cerebral edema, the consensus statement urged slower fluid-deficit correction with isotonic or near-isotonic solutions, which achieve earlier reversal of acidosis.
Isotonic and high-energy drinks are also being considered.