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MeSH Review

Air Pressure

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Disease relevance of Air Pressure


Psychiatry related information on Air Pressure

  • Approximately half were diagnosed with epilepsy and almost three-quarters had sleep disorders sufficiently intrusive to require therapy (either continuous positive air pressure (CPAP) or medication) [2].

High impact information on Air Pressure

  • An important part of the variance in L-tryptophan availability (ie, 12% to 14%) could be explained by the composite effects of present and past climatic factors; higher ambient temperature and relative humidity in the face of lower air pressure are the most important predictors of low L-tryptophan availability [3].
  • LPS, as measured by the lowest air pressure required to elicit the laryngeal adductor reflex (LAR), was determined both before and after laryngopharyngeal infusions of normal saline and 0.1 N hydrochloric acid performed on separate days [4].
  • Upper airway luminal patency is influenced by a number of factors including: intraluminal air pressure, upper airway dilator muscle activity, surrounding extraluminal tissue pressure, and also surface forces which can potentially act within the liquid layer lining the upper airway [5].
  • Kainic acid was then injected into the brainstem of the alert cat through the injection micropipette by an air pressure system [6].
  • By utilizing a highly sensitive air-pressure measuring transducer (AMPT), we were able to record MEMA accurately without artifactual stimulation of this endogenously occurring REM sleep phasic activity [7].

Biological context of Air Pressure

  • Measurements of the subjects' vocal fundamental frequency, maximum phonation time, oral air volume velocity, and peak intra-oral air pressure during production of selected speech stimuli were made before the introduction of triamcinolone and following the first and second years of drug use [8].
  • At 55% of total lung capacity (TLC, the volume at a transpulmonary pressure (Ptp) of 25 cmH2O before treatment), in both the Triton-washed and the ventilated lung, Ptp increased from 5 to 11 cmH2O, whereas Pliq, decreased from -3 to -11 cmH2O relative to alveolar air pressure [9].

Anatomical context of Air Pressure


Associations of Air Pressure with chemical compounds

  • Brief air pressure application of acetylcholine (ACh) elicited nicotinic inward current responses in both GABAergic and non-GABAergic neurons [11].
  • Loss of air pressure resistance leads to a high rate (25.7%) of inaccurate needle-tip placement in the posterior soft tissues of the back during lumbar epidural steroid administration employing a 20-gauge Tuohy needle [12].
  • Results show that the stability of liposomes composed of saturated phosphatidylcholine and DPPG (9:1 mole ratio) is affected by the operating and environmental conditions under which aerosolization takes place, with air pressure having the greatest effect [13].
  • The technique involves the use of an argon fluoride excimer laser, in the deep ultraviolet (UV) region of the spectrum at 193 nm, which is guided through a glass pipette filled with a positive air pressure [14].
  • The effects of air pressure, temperature, buffer osmotic strength, and pH on nebulized liposome dispersions were studied [13].

Gene context of Air Pressure

  • The throughput is about 2 samples/h using +20 kV voltage plus 5 mbar air pressure for separation [15].
  • Three RLS and six ALB patients received intermittent mandatory ventilation or continous positive air pressure after operation [16].
  • Further, applying the standard PTP correction factor for this well chamber is insufficient in accounting for the change in chamber response with air pressure for low-energy (<100 keV) photon and low-energy (<0.75 MeV)beta sources [17].
  • Thirty patients with symptomatic rheumatoid arthritis (RA) of both hands were treated with an air pressure splint [18].
  • In turn, rhoa depends on air pressure (P(B)) and temperature (T): rhoa=rho0 x 0.359 x P(B) x T(-1), where rho0 is the air density at 760 mmHg (101.3 kPa) and 273 K [19].

Analytical, diagnostic and therapeutic context of Air Pressure

  • Incorrect needle position during lumbar epidural steroid administration: inaccuracy of loss of air pressure resistance and requirement of fluoroscopy and epidurography during needle insertion [12].
  • Variations in luminal air pressure have a significant influence on GBF as measured by LDF, and therefore intragastric manometry and standardization of intraluminal air pressure is necessary in endoscopic LDF measurements [20].


  1. Role of endothelin and nitric oxide imbalance in the pathogenesis of hypoxia-induced arterial hypertension. Ni, Z., Bemanian, S., Kivlighn, S.D., Vaziri, N.D. Kidney Int. (1998) [Pubmed]
  2. Interface of epilepsy and sleep disorders. Beran, R.G., Plunkett, M.J., Holland, G.J. Seizure : the journal of the British Epilepsy Association. (1999) [Pubmed]
  3. Seasonal variation in plasma L-tryptophan availability in healthy volunteers. Relationships to violent suicide occurrence. Maes, M., Scharpé, S., Verkerk, R., D'Hondt, P., Peeters, D., Cosyns, P., Thompson, P., De Meyer, F., Wauters, A., Neels, H. Arch. Gen. Psychiatry (1995) [Pubmed]
  4. Patients with gastro-oesophageal reflux disease and cough have impaired laryngopharyngeal mechanosensitivity. Phua, S.Y., McGarvey, L.P., Ngu, M.C., Ing, A.J. Thorax (2005) [Pubmed]
  5. Decreased surface tension of upper airway mucosal lining liquid increases upper airway patency in anaesthetised rabbits. Kirkness, J.P., Christenson, H.K., Garlick, S.R., Parikh, R., Kairaitis, K., Wheatley, J.R., Amis, T.C. J. Physiol. (Lond.) (2003) [Pubmed]
  6. Differential effect of injections of kainic acid into the prepositus and the vestibular nuclei of the cat. Godaux, E., Mettens, P., Cheron, G. J. Physiol. (Lond.) (1993) [Pubmed]
  7. A sensitive air pressure-measuring transducer for indirect middle ear muscle recording in humans. Slegel, D.E., Roffwarg, H.P. Sleep. (1991) [Pubmed]
  8. The effects of triamcinolone acetonide on the voice. Watkin, K.L., Ewanowski, S.J. Journal of speech and hearing research. (1979) [Pubmed]
  9. Alveolar liquid pressure in excised edematous dog lung with increased static recoil. Beck, K.C., Lai-Fook, S.J. Journal of applied physiology: respiratory, environmental and exercise physiology. (1983) [Pubmed]
  10. Isoprenaline-induced facilitation of the Eustachian tube opening. Malm, L., White, P. Acta Otolaryngol. (1984) [Pubmed]
  11. Nicotinic acetylcholine receptor subtypes involved in facilitation of GABAergic inhibition in mouse superficial superior colliculus. Endo, T., Yanagawa, Y., Obata, K., Isa, T. J. Neurophysiol. (2005) [Pubmed]
  12. Incorrect needle position during lumbar epidural steroid administration: inaccuracy of loss of air pressure resistance and requirement of fluoroscopy and epidurography during needle insertion. Bartynski, W.S., Grahovac, S.Z., Rothfus, W.E. AJNR. American journal of neuroradiology. (2005) [Pubmed]
  13. Nebulization of liposomes. III. The effects of operating conditions and local environment. Niven, R.W., Carvajal, T.M., Schreier, H. Pharm. Res. (1992) [Pubmed]
  14. Technique for cellular microsurgery using the 193-nm excimer laser. Palanker, D., Ohad, S., Lewis, A., Simon, A., Shenkar, J., Penchas, S., Laufer, N. Lasers in surgery and medicine. (1991) [Pubmed]
  15. Screening of octanol-water partition coefficients for pharmaceuticals by pressure-assisted microemulsion electrokinetic chromatography. Jia, Z., Mei, L., Lin, F., Huang, S., Killion, R.B. Journal of chromatography. A. (2003) [Pubmed]
  16. Crystalloid vs colloid in the etiology of pulmonary failure after trauma: a randomized trial in man. Lowe, R.J., Moss, G.S., Jilek, J., Levine, H.D. Surgery (1977) [Pubmed]
  17. The effect of ambient pressure on well chamber response: Monte Carlo calculated results for the HDR 1000 plus. Bohm, T.D., Griffin, S.L., DeLuca, P.M., DeWerd, L.A. Medical physics. (2005) [Pubmed]
  18. Air pressure splint effects on hand symptoms of patients with rheumatoid arthritis. McKnight, P.T., Schomburg, F.L. Archives of physical medicine and rehabilitation. (1982) [Pubmed]
  19. Cycling on Earth, in space, on the Moon. di Prampero, P.E. European journal of applied physiology. (2000) [Pubmed]
  20. Continuous measurement of gastric blood flow by laser-Doppler flowmetry during gastroscopy. Christoforidis, E.C., Hovendal, C., Bjerring, P., Kruse, A. Scand. J. Gastroenterol. (1989) [Pubmed]
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