O’Neill Grading System
The O’Neill grading system is a way to categorise the severity of middle-ear barotrauma (MEBT). It is simple and is intended to provide consistency in diagnosis with sufficient details to direct treatment.
Grade 0: Eustachian Tube Dysfunction
Grade 0: Eustachian Tube Dysfunction
- Baseline photo depicting anatomical appearance of the tympanic membrane (TM) before exposure to pressure
- Symptoms with no anatomical change (no trauma) from baseline
Grade 1 Barotrauma
- Erythema increased from baseline
- Fluid or air trapping (visible bubble) in the middle-ear space
Grade 2 Barotrauma
- Any bleeding noted within the tympanic membrane or middle-ear space
Old Habits Die HardSave a Diver, Save YourselfCylinder SafetyUndercover CrabsReef safe sunscreenPhysics, Biophysics and Decompression SicknessModels and Marine LifeSunscreen and CoralCristina Mittermeier: Commitment to ConservationDiving After a StrokeCurrent DivesThis Bites: Prevention TreatmentEnvironmental Considerations for Disinfection
Aqua Pool Noodle ExercisesUnderwater Photographer and DAN Member Madelein Wolfaardt10 Simple Things You Can Do to Improve Your Underwater PhotographyCOVID-19 and Diving: March 2021 UpdateDiver Return After COVID-19 Infection (DRACO): A Longitudinal AssessmentGuidelines for Lifelong Medical Fitness to DiveExperienceFitness Myth or Fitness Fact?The Safety of Sports for Athletes With Implantable Cardioverter-DefibrillatorsCardiovascular Fitness and DivingHypertensionPatent Foramen Ovale (PFO)Headaches and DivingMiddle-Ear Barotrauma (MEBT)O’Neill Grading SystemMask Squeeze (Facial Barotrauma)Sinus BarotraumaInner-Ear Barotrauma (IEBT)Middle-Ear EqualisationAlternobaric VertigoDecompression IllnessOn-Site Neurological ExaminationTreating Decompression Sickness (The Bends)Top 5 Factors That Increase Your Risk of the BendsHow to Avoid Rapid Ascents and Arterial Gas EmbolismUnintended Rapid Ascent Due to Uncontrolled InflationUnexpected Weight LossFlying After DivingWisdom Tooth Extraction and DivingYour Lungs and DivingScuba Diving and DiabetesDiving after COVID-19: What We Know TodaySwimmer’s Ear (Otitis Externa)Motion SicknessFitness for DivingDiving After Bariatric SurgeryWhen to Consult a Health-Care Provider Before Engaging in Physical ActivitiesFinding Your FitnessHealth Concerns for Divers Over 50Risk Factors For Heart DiseaseJuggling Physical Exercise and DivingSeasickness Prevention and TreatmentMember to Member: Guidelines for SeniorsHigh-Pressure OphthalmologyOver-the-Counter Medications
Due Diligence for Parents and Young DiversThe Deepest Scuba Dive - Part 1Macro Photography 101 with Kate Jonker - Part 1Pregnancy and DivingPregnant and Still Freediving Macro Photography 101 with Kate Jonker - Part 2How Old Is Too OldHow To Clean Your Scuba EquipmentNew Gear OrientationAre 6351-T6 Alloy Scuba Cylinders Safe to Use?Invisible CrystalsHose FailureGear Maintenance: Protect Your Investment and Prevent Dive AccidentsAvoiding Panic After Regulator FailureExperience MattersDive Accident Coverage Vs. Medical & Travel Insurance: Do You Need Both?Medical Emergencies AbroadDive Operations and COVID-19: Prepping for Return FAQsWhen Should I Call My Doctor?
Pack Your Camera Equipment for a Dive TripMagic in the GulfAn Insider’s Guide to RoatánShooting in a Turbid EnvironmentSurviving Triple Dangers in the MaldivesShallow-Water Arterial Gas EmbolismsKnow the RisksThe Case of Catastrophic Kelp LossCOPD: Incompatible With DivingHiatal HerniaReturn to Freeding after Cancer TreatmentOuter- and Inner Ear InfectionsExercising After a BreakHazards in Wreck DivingAw InspiredOperation Rising SunDCS in Cozumel