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Vaughan Williams classification

Cardiology The system by EM Vaughan Williams, used to categorize effects of antiarrhythmics by class. See Antiarrhythmic drugs. Cf Sicilian Gambit.
Vaughan Williams Classification of Antiarrhythmic Drugs
Class I Sodium-channel blockers
IA Moderately slow conduction, moderately prolonged duration of action potential–active in atria, ventricles; most cardiotoxic group
Examples Quinidine, procainamide, diisopyramide
IB Minimally slowed conduction, shortened duration of action potential–active in atria; greatest potential for proarrhythmias
Examples Lidocaine, mexiletine, tocainamide, phenytoin
IC Markedly slowed conduction, minimally duration of action potential–active in atria, ventricles; most effective group
Examples Flecainide, encainide, propafenone, moricizine
Class II Beta blockers–active in AV nodes, ventricles; virtually no proarrhythmic effect
Class III Potassium-channel blockers; prolonged duration of action potential
Examples Amiodarone, bretylium, sotalol, ibutilide
Class IV Calcium-channel blockers–active in AV nodes; virtually no proarrhythmic effect
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

IA

Abbreviation for intraarterial;
intraarticular;
isopropyl alcohol.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

IA

Abbreviation for intraarterial.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
For this reason information assurance becomes one of the most important issues and must be encrypted before transmission from end-to-end.
With this new approach that the SPAWAR Security Control Assessor and Information Assurance Technical Authority has taken to ensure validators are properly trained and qualified, the Navy has positioned itself to be in an improved state of readiness to defend against cyber-attacks.
While collaborative information sharing tools continually advance to offer improved security measures, collaboration solutions should mirror the high levels of reliability and information assurance that missions require.
In 2008 the Joint Task Force on Computing Curricula adopted the MSR model as part of the information technology model curricula for information assurance and security (ACM, 2008, p.
The source for these standards were from NSA Information Assurance Courseware Evaluation Program (NSA, 2009b).
With SOX as an indicator of the future direction of compliance-driven information assurance, a holistic, program-based approach can provide the necessary capability to address security and privacy compliance across most enterprises.
In the realm of information assurance, a similar compartmentalization of roles leads to more independent and effective technology governance.
Information assurance is a business issue, not something extra for IT to handle.
Failure of individuals to register in ADLS and take the annual IA Awareness course can result in FISMA non-compliance and have a negative impact on mission readiness, information assurance posture, and the Air Force's overall FISMA grade.
The Information Assurance Manager (IAM), Defense Security Cooperation Agency Information Technology Directorate, participated and contributed to the Department of Defense (DoD) Technical Analysis Group (TAG) responsible for the acquisition of a DoD enterprise-wide anti-spyware solution recently.
Information Assurance (IA) awareness training is now required of all users of DOD information systems, as stated in a recent message by the DON's Chief Information Office and the Naval Network Warfare Command (NETWARCOM).
The Office of the Assistant Secretary of Defense Networks and Information Integration has identified net-centric best practices as using a Service-oriented Architecture, implementing a data-centric strategy, information assurance strategy and use of Net-Centric Operations Warfare Reference Model.

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