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.

Cost Effectiveness of Helium dilution technique

| group5 = Clinical Trials Involving Helium dilution technique | list5 = Ongoing Trials on Helium dilution technique at Clinical Trials.gov • Trial results on Helium dilution technique • Clinical Trials on Helium dilution technique at Google

| group6 = Guidelines / Policies / Government Resources (FDA/CDC) Regarding Helium dilution technique | list6 = 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

| group7 = Textbook Information on Helium dilution technique | list7 = Books and Textbook Information on Helium dilution technique

| group8 = Pharmacology Resources on Helium dilution technique | list8 = AND (Dose)}} Dosing of Helium dilution technique • AND (drug interactions)}} Drug interactions with Helium dilution technique • AND (side effects)}} Side effects of Helium dilution technique • AND (Allergy)}} Allergic reactions to Helium dilution technique • AND (overdose)}} Overdose information on Helium dilution technique • AND (carcinogenicity)}} Carcinogenicity information on Helium dilution technique • AND (pregnancy)}} Helium dilution technique in pregnancy • AND (pharmacokinetics)}} Pharmacokinetics of Helium dilution technique •

| group9 = Genetics, Pharmacogenomics, and Proteinomics of Helium dilution technique | list9 = AND (pharmacogenomics)}} Genetics of Helium dilution technique • AND (pharmacogenomics)}} Pharmacogenomics of Helium dilution technique • AND (proteomics)}} Proteomics of Helium dilution technique

| group10 = Newstories on Helium dilution technique | list10 = Helium dilution technique in the news • Be alerted to news on Helium dilution technique • News trends on Helium dilution technique</small>

| group11 = Commentary on Helium dilution technique | list11 = Blogs on Helium dilution technique

| group12 = Patient Resources on Helium dilution technique | list12 = 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

| group13 = Healthcare Provider Resources on Helium dilution technique | list13 = Symptoms of Helium dilution technique • Causes & Risk Factors for Helium dilution technique • Diagnostic studies for Helium dilution technique • Treatment of Helium dilution technique

| group14 = Continuing Medical Education (CME) Programs on Helium dilution technique | list14 = CME Programs on Helium dilution technique

| group15 = International Resources on Helium dilution technique | list15 = Helium dilution technique en Espanol • Helium dilution technique en Francais

| group16 = Business Resources on Helium dilution technique | list16 = Helium dilution technique in the Marketplace • Patents on Helium dilution technique

| group17 = Informatics Resources on Helium dilution technique | list17 = List of terms related to Helium dilution technique

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