cmH2O

センチメートル水柱

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/06/14 01:38:16」(JST)

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A centimetre of water (US spelling centimeter of water, abbreviated cm H₂O or cm H₂O) is a less commonly used unit of pressure derived from pressure head calculations using metrology. It is frequently used to measure the central venous pressure, the intracranial pressure while sampling cerebrospinal fluid, as well as determining pressures during mechanical ventilation or in water supply networks (then usually in metres water column). It is also a common unit of pressure in the speech sciences.

It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity, so that 1 cmH₂O (4°C) = 999.9720 kg/m³ × 9.80665 m/s² / 100 = 98.0638 Pa, but conventionally a nominal maximum water density of 1000 kg/m³ is used, giving 98.0665 Pa.

This unit is commonly used to specify the pressure to which a CPAP machine is set after a polysomnogram.

1 cmH2O (conventional)	= 98.0665 pascals
	= 0.01 metre water (mH2O), metre water column (m.wc) or metre water gauge (m wg)
	= 10 mm wg
	≈ 0.980665 mbar or hPa
	≈ 0.39370 inH2O
	≈ 0.000967838 atm
	≈ 0.73556 torr
	≈ 0.735559 mm Hg
	≈ 0.0289590 inHg
	≈ 0.0142233 psi

See also

• Inch of water
• Pressure head

References

External links

• Pressure conversion calculator at Cornell University website

UpToDate Contents

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English Journal

• [Dentin barrier cytotoxicity test with three-dimensional cell cultures].

• Jiang RD1, Lin H1, Zheng G1, Yuan SP1, DU Q2, Zhang Y1.
• Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences.Beijing Da Xue Xue Bao.2015 Apr 18;47(2):330-5.
• OBJECTIVE: To evaluate the cytotoxicity of four dentin filling materials and two dentin adhesives with a dentin barrier test and to compare the results with those in a conventional filter diffusion test in order to investigate the advantages of the dentin barrier test.METHODS: Eugenol cement, zinc p
• PMID 25882955

• Role of spinal metabotropic glutamate receptor 5 in pudendal inhibition of the nociceptive bladder reflex in cats.

• Reese JN1, Rogers MJ1, Xiao Z2, Shen B1, Wang J1, Schwen Z1, Roppolo JR3, de Groat WC3, Tai C4.
• American journal of physiology. Renal physiology.Am J Physiol Renal Physiol.2015 Apr 15;308(8):F832-8. doi: 10.1152/ajprenal.00623.2014. Epub 2015 Feb 11.
• This study examined the role of spinal metabotropic glutamate receptor 5 (mGluR5) in the nociceptive C-fiber afferent-mediated spinal bladder reflex and in the inhibtion of this reflex by pudendal nerve stimulation (PNS). In α-chloralose-anesthetized cats after spinal cord transection at the T9/T10
• PMID 25673810

• Expiratory load compensation is associated with electroencephalographic premotor potentials in humans.

• Morawiec E1, Raux M2, Kindler F2, Laviolette L3, Similowski T4.
• Journal of applied physiology (Bethesda, Md. : 1985).J Appl Physiol (1985).2015 Apr 15;118(8):1023-30. doi: 10.1152/japplphysiol.00201.2014. Epub 2015 Feb 5.
• In normal humans during quiet breathing, expiration is mostly driven by elastic recoil of the lungs. Expiration becomes active when ventilation must be increased to meet augmented metabolic demands, or in response to expiratory loading, be it experimental or disease-related. The response to expirato
• PMID 25663669

Japanese Journal

• 抗コリン薬抵抗性の神経因性膀胱に対するミラベグロンの併用効果 : ビデオウロダイナミクスを用いた検討

• 和田 直樹,岡崎 智,小林 進,橋爪 和純,北 雅史,松本 成史,柿崎 秀宏
• 泌尿器科紀要 = Acta urologica Japonica 61(1), 7-11, 2015-01
• … We retrospectively studied 7 patients with neurogenic bladder (5 males and 2 females) who had detrusor overactivity (DO) or low compliance bladder (＜10 ml/cmH2O) despite taking anticholinergic medication. …
• NAID 120005539312

• 簡易陰圧閉鎖療法を用いた小児胸骨正中切開後縦隔洞炎の治療

• 小澤 英樹,根本 慎太郎,島田 亮,福原 慎二,小西 隼人,本橋 宜和,打田 裕明,勝間田 敬弘
• 日本心臓血管外科学会雑誌 44(2), 65-69, 2015
• … で全身麻酔下に十分なデブリドメントを行い，感染部位すべて（縦隔，心嚢，胸腔）に創部ドレッシング用薄型ポリウレタンフォームを充填し，ドレーンを1～3本留置の後にイソジンドレープで密閉して－99 cmH2Oで（－73 mmHgに相当）持続吸引を行った．麻酔覚醒の後に，一般病棟で行動制限のない管理を行った．2～3日ごとに同処置を繰り返し，連続2回の創部培養の陰性化を確認後に閉胸した．治療期中は抗生剤の全 …
• NAID 130005062367

• Mean Lung Pressure during Adult High-Frequency Oscillatory Ventilation: An Experimental Study Using a Lung Model

• Hirayama Takahiro,Nagano Osamu,Shiba Naoki,Yumoto Tetsuya,Sato Keiji,Terado Michihisa,Ugawa Toyomu,Ichiba Shingo,Ujike Yoshihito
• Acta Medica Okayama 68(6), 323-329, 2014-12
• … The ventilator settings were as follows:mean airway pressure (MAP), 30cmH2O;frequency, 5-15Hz (every 1Hz);airway pressure amplitude (AMP), maximum;and % of inspiratory time (IT), 50% for R100, 33% or 50% for 3100B. …
• NAID 120005525310

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