Helium dilution technique

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The helium dilution technique is the way of measuring the functional residual capacity of the lungs (the volume left in the lungs after normal expiration).

This technique is a closed-circuit system where a spirometer is filled with a mixture of Helium and Oxygen. The amount of He in the spirometer is known at the beginning of the test ( Concentration x Volume = Amount). The patient is then asked to breath in the mixture starting from FRC (Functional Residual Capacity), also known as end expiration. Because there is no leak of substances in the system, the amount of He remains constant during the test, and the final concentration of He in the spirometer is measured. By using the folllowing equation: C1V1 = C2V2

V2= Total Gas volume ( volume of lung + volume of spirometer). V1= Volume of gas in spirometer.

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Articles on Helium dilution technique	Most recent articles on Helium dilution technique • Most cited articles on Helium dilution technique • Review articles on Helium dilution technique • Articles on Helium dilution technique in N Eng J Med, Lancet, BMJ
Media (Slides, Video, Images, MP3) on Helium dilution technique	Powerpoint slides on Helium dilution technique • Images of Helium dilution technique • Photos of Helium dilution technique • Podcasts & MP3s on Helium dilution technique • Videos on Helium dilution technique
Evidence Based Medicine Regarding Helium dilution technique	Cochrane Collaboration on Helium dilution technique • Bandolier on Helium dilution technique • TRIP on Helium dilution technique
Cost Effectiveness of Helium dilution technique	Cost Effectiveness of Helium dilution technique
Clinical Trials Involving Helium dilution technique	Ongoing Trials on Helium dilution technique at Clinical Trials.gov • Trial results on Helium dilution technique • Clinical Trials on Helium dilution technique at Google
Guidelines / Policies / Government Resources (FDA/CDC) Regarding Helium dilution technique	US National Guidelines Clearinghouse on Helium dilution technique • NICE Guidance on Helium dilution technique • NHS PRODIGY Guidance • FDA on Helium dilution technique • CDC on Helium dilution technique
Textbook Information on Helium dilution technique	Books and Textbook Information on Helium dilution technique
Pharmacology Resources on Helium dilution technique	Dosing of Helium dilution technique • Drug interactions with Helium dilution technique • Side effects of Helium dilution technique • Allergic reactions to Helium dilution technique • Overdose information on Helium dilution technique • Carcinogenicity information on Helium dilution technique • Helium dilution technique in pregnancy • Pharmacokinetics of Helium dilution technique •
Genetics, Pharmacogenomics, and Proteinomics of Helium dilution technique	Genetics of Helium dilution technique • Pharmacogenomics of Helium dilution technique • Proteomics of Helium dilution technique
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Commentary on Helium dilution technique	Blogs on Helium dilution technique
Patient Resources on Helium dilution technique	Patient resources on Helium dilution technique • Discussion groups on Helium dilution technique • Patient Handouts on Helium dilution technique • Directions to Hospitals Treating Helium dilution technique • Risk calculators and risk factors for Helium dilution technique
Healthcare Provider Resources on Helium dilution technique	Symptoms of Helium dilution technique • Causes & Risk Factors for Helium dilution technique • Diagnostic studies for Helium dilution technique • Treatment of Helium dilution technique
Continuing Medical Education (CME) Programs on Helium dilution technique	CME Programs on Helium dilution technique
International Resources on Helium dilution technique	Helium dilution technique en Espanol • Helium dilution technique en Francais
Business Resources on Helium dilution technique	Helium dilution technique in the Marketplace • Patents on Helium dilution technique
Informatics Resources on Helium dilution technique	List of terms related to Helium dilution technique

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Acknowledgement and Attribution Regarding Sources of Content

Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .