Neurosurgical Abbreviations
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I¹²⁵       radioactive iodine

I¹³¹       radioactive iodine

I&A      irrigation and aspiration

IAC      internal auditory canal

IAR      instantaneous axis of rotation

IASD    intra-atrial septal defect

IASDH  infantile acute subdural hematoma

IBC       iron binding capacity

IBW      ideal body weight

ICA      internal carotid artery

ICBG    iliac crest bone graft

ICCE     intracapsular cataract extraction

ICD-9-CM International Classification of Diseases - 9th Edition Clinical Modification (list of coded diagnoses)

ICH       intracerebral hemorrhage

ICMJE   International Committee of Medical Journal Editors

ICP       intracranial pressure or intermittent catheterization program

ICS       intercostal space

ICT       intermittent cervical traction

I.C.U.    intensive care unit

ID         identification

IDD       internal disruption of the disc

I&D       incise and drain

IDDM    insulin-dependent diabetes mellitus

IDE       investigational device exception

IDET     intradiscal electrotherapy

i.e.       that is

IEP       Integrated Ethics Program

IgA       gamma A immunoglobulin

IgD       gamma D immunoglobulin

IgE       gamma E immunoglobulin

IGF       insulin-like growth factor

IgG       gamma G immunoglobulin

IgG/IgM    antibody discrimination as to immunoglobulin

IgM       gamma M immunoglobulin

IGS      image guided surgery

I.I.         image intensifier (fluoroscope)

IIH        idiopathic intracranial hypertension

IIHWOP    ideopathic intracranial hypertension without papilledema 

IJP        internal jugular pressure

ILBBB  incomplete left bundle branch block

IM         intramuscular

imb.      imbalance

IME       independent medical examination or examiner

immob. immobilizer

imp.      impression

iMRI      intraoperative magnetic resonance imaging

IMRT    Intensity modulated radiation therapy

IMV      intermittent mandatory ventilation

inc.      increase

incont. incontinent

IND       investigational new drug application

ing.      inguinal

INH       isonicotinic acid hydrazide (tuberculosis medication)

ini         initial

inj.        injection

INO      intranuclear ophthalmoplegia

INR       international normalized ratio (for PT time testing)

int.       internal

I&O      input and output

IOL       intraocular lens

IOM      Institute of Medicine

IOP       intraocular pressure

IP         intraphalangeal

IPPB     intermittent positive pressure breathing

IPPC     Initiative for Pediatric Palliative Care

IPT       intermittent pelvic traction

I.Q.       intelligence quotient

IR         internal rotation

IR         inferior rectus or infrared

IRBBB  intermittent right bundle branch block

IRDS    idiopathic respiratory distress syndrome

irreg.    irregular

IS         incentive spirometer

ISG      immune serum globulin

ISIS      International Spinal Injection Society

ISS       insulin sliding scale

IT         intrathecal or inhalation therapy or intertuberous (pelvic) measurement

ITC's    isolated tumor cells

ITP       idiopathic thrombocytopenic purpura

ITT       insulin tolerance test

IUD       intrauterine device (contraceptive)

IUGR    intrauterine growth retardation

IUP       intrauterine pregnancy

IUPC     intrauterine pressure catheter

IV         intravenous

IVA      intravenous anesthesia

IVC      intraventricular catheter

IVD      intravertebral disc

IVDA    intravenous drug addict

IVF       in vitro fertilization or intravenous fluids

IVP       intravenous pyelogram or intravenous "push"

IVPB    intravenous "piggyback"

IVSD    intraventricular septal defect

IVS(ed)    intraventricular septum (end diastole)

IVS(es)    intraventricular septum (end systole)

IVS/LVP   intraventricular septum divided by left ventricular posterior wall at end diastole

IV SP   intravenous "slow" push (drug delivery)

If you are aware of any abbreviations not in this list, your help would be greatly appreciated.  Please send me any abbreviations not on the list and I will update the web site.  Click here to send a comment.