Decompression Sickness in Inside Attendants
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Compressed Air Compressed
Construction Planning, Equipment, and Methods Sixth Edition CHAPTER COMPRESSEDCOMPRESSED AIRAIR • A. J. Clark School of Engineering •Department of Civil and Environmental Engineering By 11 Dr. Ibrahim Assakkaf ENCE 420 – Construction Equipment and Methods Spring 2003 Department of Civil and Environmental Engineering University of Maryland, College Park CHAPTER 11. COMPRESSED AIR Slide No. 1 ENCE 420 ©Assakkaf COMPRESSEDCOMPRESSED AIRAIR 1 CHAPTER 11. COMPRESSED AIR Slide No. 2 ENCE 420 ©Assakkaf INTRODUCTION Compressed air is used for: 9Drilling rock 9Driving piles 9Operating hand tools 9Pumping 9Cleaning PAVING PUMP BREAKER CHAPTER 11. COMPRESSED AIR Slide No. 3 ENCE 420 ©Assakkaf INTRODUCTION In many instances the energy supplied by compressed air is the most convenient method of operating equipment and tools. When air is compressed, it receives energy from the compressor. This energy is transmitted through a pipe or hose to the operating equipment, where a portion of the energy is converted into mechanical work. 2 CHAPTER 11. COMPRESSED AIR Slide No. 4 ENCE 420 ©Assakkaf INTRODUCTION The operations of compressing, transmitting, and using air will always result in a loss of energy, which will give an overall efficiency less than 100%, sometimes considerably less. CHAPTER 11. COMPRESSED AIR Slide No. 5 ENCE 420 ©Assakkaf INTRODUCTION Things to consider: 9Effect of altitude on capacity. 9Loss of air pressure in pipe and hose systems. 9Capacity factors. 3 CHAPTER 11. COMPRESSED AIR Slide No. 6 ENCE 420 ©Assakkaf OVERVIEWOVERVIEW Selecting the right air compressor depends on many factors. ¾ Compressor capacity and operating pressure depend on the tools used. ¾ Engine and compressor lose power and capacity as altitude increases and temperature rises. -
Urinary Problems in Decompression Sickness*
Paraplegia 23 (1985) 20-25 © 1985 International Medical Society of Paraplegia Urinary Problems in Decompression Sickness* Athanasios Dounis, M.D. and Dionisios Mitropoulos, M.D. The Naval Medical Hyperbaric Center) Piraeus Naval Hospital and Department of Urology) Athens Naval Hospital) Greece Summary The records of 25 patients with type II decompression sickness and urinary problems have been reviewed. Seventeen patients were professionals and 8 were above the age of 40. The disease appeared within the 1st hour of emergence from the water in 70% of the cases and within the first 4 hours in the remaining 30%. Nine patients were diagnosed as paraplegic and two as tetraplegic. All patients had urinary disturbances and 14 were on Foley-catheter drainage during the decompression while 11 were on intermittent catheterisation. Fifteen patients had improved urinary function after recompression) 8 had some difficulty) 2 underwent a sphincterotomy and one a transurethral prostatectomy. The low percentage of complete recovery was due to the delayed arrival at the decompression chamber. Key words: Diving; Decompression sickness; Urinary disturbances. Introduction Diving for sponge fishery is the main professional occupation of the young men in the South-East Aegean islands. Although the use of recompression has decreased the number of decompression sickness victims, patients with remaining neurological problems still present. During the last 20 years, although there is a decrease of the professional divers' accidents there is an increase of the number of patients with decompression sickness. This is due to the continuously increasing numbers of sport divers in Greece. In Greece, the field of underwater medicine is covered mainly by the Naval Medical Service. -
What Chamber Operators Should Know About Ear Barotrauma (And How to Prevent It) Robert Sheffield, CHT and Kevin “Kip” Posey, CHT / June 2018
LEARN.HYPERBARICMEDICINE.COM International ATMO Education What Chamber Operators Should Know About Ear Barotrauma (and How to Prevent It) Robert Sheffield, CHT and Kevin “Kip” Posey, CHT / June 2018 INTRODUCTION Ear barotrauma (i.e. “ear block”, “ear squeeze”) is the most common complication of hyperbaric treatment. It occurs when the pressure in the hyperbaric chamber is greater than the pressure in the middle ear. It is prevented by patient assessment, patient education, and the appropriate actions of the chamber operator. The chamber operator has an important role in preventing ear barotrauma in hyperbaric patients. OBJECTIVES At the conclusion of this article, the reader will be able to: Describe the anatomy of the middle ear Explain the mechanism of ear barotrauma Describe 3 techniques to equalize middle ear pressure ANATOMY OF THE MIDDLE EAR The middle ear is an air space that separates the external ear canal from the inner ear. The eardrum, called the tympanic membrane (TM), vibrates when sound enters the ear canal. The vibration is transmitted to a series of bones in the middle ear. These bones transmit vibration to another membrane (the oval window) that separates the air‐filled middle ear from the fluid‐filled inner ear, where sound is sensed in the cochlea. The nasopharynx is the area behind the nose and above the palate. The Eustachian tubes open into this area. Because of the location of the Eustachian tube openings, the same things that cause nasal congestion (e.g. allergies, upper respiratory infection) can cause swelling around the opening of the Eustachian tubes, making it more difficult to equalize pressure in the middle ear. -
Full Paper/Talk Deep Stops and Shallow Stops – Fact and Fancy
Full Paper/Talk Deep Stops and Shallow Stops – Fact and Fancy B.R. Wienke1 and T.R. O’Leary2 1 C&C Dive Team Ldr, Program Manager Computational Physics, LANL, MS D490, Los Alamos, NM 87545 [email protected] 2 Director, NAUI Technical Diving Operations, 33256 State Rd 100, South Padre Island, TX, 78597 Abstract The question of deep stops and shallow stops is interesting and fraught with controversy in diving circles and operations, training, exploration and scientific endeavors. Plus frought with some misunderstanding which is understandable as the issues are complex. We therefore attempt a short history of deep and shallow stops, physical aspects, staging differences, diving tests, models with data correlations and data banks with user statistics and DCS outcomes as diver amplification. Pros and cons of both deep stop and shallow stop staging are presented. Misfacts are righted when appropriate. Chamber, wet and Doppler tests are contrasted. A compendium of Training Agency Standards regarding deep and shallow stops is included. Dive software is also detailed. Some commercial diving operations are discussed. A short tabulation of dive computer and software algorithms is given. From diving data, tests, DCS outcomes and field usage, we conclude that both deep stops and shallow stops are safely employed in recreational and technical diving. That is a good thing but choose your deco wisely and know why. Keywords: computational models, decompression staging, profile data, risk, statistical correlations, tests Acronyms and Nomenclature ANDI: Association of Nitrox Diving Instructors. BM: bubble phase model dividing the body into tissue compartments with halftimes that are coupled to inert gas diffusion across bubble film surfaces of exponential size distribution constrained in cumulative growth by a volume limit point. -
Guidance for Divers on Medical Certificates of Fitness to Dive
Guidance for Divers on Medical Certificates of Fitness to Dive Guidance for Divers on Medical Certificates Our Vision: of Fitness to Dive Healthy, safe and productive lives and enterprises May 2019 Cyan 100% Magenta 76% Yellow 0 Black 27% Guidance for Divers on TABLE OF CONTENTS Medical Certificates of Fitness to Dive May 2019 1.0 Introduction .............................................................................2 2.0 Legal Requirements .....................................................................3 3.0 Procedure for Applying for a Medical.....................................................5 4.0 Criteria for Conducting Medicals ........................................................ 6 5.0 Frequency of Medical Assessments, Conditions and Limitations......................... 7 Appendix 1 - Medical Questionnaire .......................................................... 8 Published in November 2019 by the Health and Safety Authority, The Metropolitan Building, James Joyce Street, Dublin 1. ©All rights reserved. r fo Guidance ers on on ers Div es tificat r Ce Medical 1.0 INTRODUCTION e Div to Fitness of May 2019 May 1.1 Under the Safety, Health and Welfare at Work (Diving) Regulations 2018 and 2019 (S.I. No. 254 of 2018 as amended by S.I. No. 180 of 2019), hereafter referred to as the Diving Regulations, a diver must not dive in a diving project unless they hold a valid certificate of medical fitness to dive issued by a medical examiner of divers. These guidelines provide information on the process and the certificates. The guidelines are aimed at divers who dive for work purposes, but the information will also be of interest to diving contractors and diving supervisors. 1.2 Working underwater can be a hostile work environment so fitness to dive is vital. It is important that the diver does not suffer from any medical condition that could affect the safety of themselves or other members of the dive team. -
Critical Care in the Monoplace Hyperbaric Chamber
Critical Care in the Monoplace Hyperbaric Critical Care - Monoplace Chamber • 30 minutes, so only key points • Highly suggest critical care medicine is involved • Pitfalls Lindell K. Weaver, MD Intermountain Medical Center Murray, Utah, and • Ventilator and IV issues LDS Hospital Salt Lake City, Utah Key points Critical Care in the Monoplace Chamber • Weaver LK. Operational Use and Patient Care in the Monoplace Chamber. In: • Staff must be certified and experienced Resp Care Clinics of N Am-Hyperbaric Medicine, Part I. Moon R, McIntyre N, eds. Philadelphia, W.B. Saunders Company, March, 1999: 51-92 in CCM • Weaver LK. The treatment of critically ill patients with hyperbaric oxygen therapy. In: Brent J, Wallace KL, Burkhart KK, Phillips SD, and Donovan JW, • Proximity to CCM services (ed). Critical care toxicology: diagnosis and management of the critically poisoned patient. Philadelphia: Elsevier Mosby; 2005:181-187. • Must have study patient in chamber • Weaver, LK. Critical care of patients needing hyperbaric oxygen. In: Thom SR and Neuman T, (ed). The physiology and medicine of hyperbaric oxygen therapy. quickly Philadelphia: Saunders/Elsevier, 2008:117-129. • Weaver LK. Management of critically ill patients in the monoplace hyperbaric chamber. In: Whelan HT, Kindwall E., Hyperbaric Medicine Practice, 4th ed.. • CCM equipment North Palm Beach, Florida: Best, Inc. 2017; 65-95. • Without certain modifications, treating • Gossett WA, Rockswold GL, Rockswold SB, Adkinson CD, Bergman TA, Quickel RR. The safe treatment, monitoring and management -
The Use of Heliox in Treating Decompression Illness
The Diving Medical Advisory Committee DMAC, Eighth Floor, 52 Grosvenor Gardens, London SW1W 0AU, UK www.dmac-diving.org Tel: +44 (0) 20 7824 5520 [email protected] The Use of Heliox in Treating Decompression Illness DMAC 23 Rev. 1 – June 2014 Supersedes DMAC 23, which is now withdrawn There are many ways of treating decompression illness (DCI) at increased pressure. In the past 20 years, much has been published on the use of oxygen and helium/oxygen mixtures at different depths. There is, however, a paucity of carefully designed scientific studies. Most information is available from mathematical models, animal experiments and case reports. During a therapeutic compression, the use of a different inert gas from that breathed during the dive may facilitate bubble resolution. Gas diffusivity and solubility in blood and tissue is expected to play a complex role in bubble growth and shrinkage. Mathematical models, supported by some animal studies, suggest that breathing a heliox gas mixture during recompression could be beneficial for nitrogen elimination after air dives. In humans, diving to 50 msw, with air or nitrox, almost all cases of DCI can be adequately treated at 2.8 bar (18 msw), where 100% oxygen is both safe and effective. Serious neurological and vestibular DCI with only partial improvements during initial compression at 18 msw on oxygen may benefit from further recompression to 30 msw with heliox 50:50 (Comex therapeutic table 30 – CX30). There have been cases successfully treated on 50:50 heliox (CX30), on the US Navy recompression tables with 80:20 and 60:40 heliox (USN treatment table 6A) instead of air and in heliox saturation. -
Heat Stroke Heat Exhaustion
Environmental Injuries Co lin G. Ka ide, MD , FACEP, FAAEM, UHM Associate Professor of Emergency Medicine Board-Certified Specialist in Hyperbaric Medicine Specialist in Wound Care The Ohio State University Wexner Medical Center The Most Dangerous Drug Combination… Accidental Testosterone Hypothermia and Alcohol! The most likely victims… Photo: Ralf Roletschek 1 Definition of Blizzard Hypothermia of Subnormal T° when the body is unable to generate sufficient heat to sustain normal functions Core Temperature < 95°F 1979 (35°C) Most Important Temperatures Thermoregulation 95°F (35° C) Hyper/Goofy The body uses a Poikilothermic shell to maintain a Homeothermic core 90°F (32°C) Shivering Stops Maintains core T° w/in 1.8°F(1°C) 80°F (26. 5°C) Vfib, Coma Hypothalamus Skin 65°F (18°C) Asystole Constant T° 96.896.8-- 100.4° F 2 Thermoregulation The 2 most important factors Only 3 Causes! Shivering (10x increase) Decreased Heat Production Initiated by low skin temperature Increased Heat Loss Warming the skin can abolish Impaired Thermoregulation shivering! Peripheral vasoconstriction Sequesters heat Predisposing Predisposing Factors Factors Decreased Production Increased Loss –Endocrine problems Radiation Evaporation • Thyroid Conduction* • Adrenal Axis Convection** –Malnutrition *Depends on conducting material **Depends on wind velocity –Neuromuscular disease 3 Predisposing Systemic Responses CNS Factors T°< 90°F (34°C) Impaired Regulation Hyperactivity, excitability, recklessness CNS injury T°< 80°F (27°C) Hypothalamic injuries Loss of voluntary -
Environmental Injuries
Environmental Injuries Colin G. Kaide, MD, FACEP, FAAEM, UHM Associate Professor of Emergency Medicine Board-Certified Specialist in Hyperbaric Medicine Specialist in Wound Care The Ohio State University Wexner Medical Center 1 The Most Dangerous Drug Combination… Testosterone and Alcohol! The most likely victims… Photo: Ralf Roletschek Accidental Hypothermia 2 Blizzard of 1979 Definition of Hypothermia Subnormal T° when the body is unable to generate sufficient heat to sustain normal functions Core Temperature < 95°F (35°C) 3 Most Important Temperatures 95°F (35° C) Hyper/Goofy 90°F (32°C) Shivering Stops 80°F (26.5°C) Vfib, Coma 65°F(18F (18°C) AtlAsystole Thermoregulation The body uses a Poikilothermic shell to maintain a Homeothermic core Maintains core T° w/in 1.8°F(1°C) Hypothalamus Skin CttTConstant T° 96. 8- 100.4° F 4 Thermoregulation The 2 most important factors Shivering (10x increase) Initiated by low skin temperature Warming the skin can abolish shivering! Peripheral vasoconstriction Sequesters heat Only 3 Causes! Decreased Heat Production Increased Heat Loss Impaired Thermoregulation 5 Predisposing Factors Decreased Production –Endocrine problems • Thyroid • Adrenal Axis –Malnutrition –Neuromuscular disease Predisposing Factors Increased Loss RRditiadiation Evaporation Conduction* Convection** *DDdepends on cond dtitilucting material **Depends on wind velocity 6 Predisposing Factors Impaired Regulation CNS injury Hypothalamic injuries Peripheral Injury Atherosclerosis Neuropathy Interfering Agents Systemic Responses CNS -
ECHM-EDTC Educational and Training Standards for Diving and Hyperbaric Medicine 2011
ECHM-EDTC Educational and Training Standards for Diving and Hyperbaric Medicine 2011 EDUCATIONAL AND TRAINING STANDARDS FOR PHYSICIANS IN DIVING AND HYPERBARIC MEDICINE Written by Joint Educational Subcommittee of the European Committee for Hyperbaric Medicine (ECHM) and the European Diving Technical Committee (EDTC) List of content: Foreword ..................................................................................................................................................2 1. Introduction...........................................................................................................................................3 2. Definition of jobs...................................................................................................................................4 3. Training programs ................................................................................................................................6 4. Content of modules ..............................................................................................................................7 5. Standards for course organisation and certification.............................................................................9 5.1. Teaching courses..........................................................................................................................9 5.2. Modules and course organisation.................................................................................................9 5.3. Recognition of an expert.............................................................................................................10 -
Dysbarism - Barotrauma
DYSBARISM - BAROTRAUMA Introduction Dysbarism is the term given to medical complications of exposure to gases at higher than normal atmospheric pressure. It includes barotrauma, decompression illness and nitrogen narcosis. Barotrauma occurs as a consequence of excessive expansion or contraction of gas within enclosed body cavities. Barotrauma principally affects the: 1. Lungs (most importantly): Lung barotrauma may result in: ● Gas embolism ● Pneumomediastinum ● Pneumothorax. 2. Eyes 3. Middle / Inner ear 4. Sinuses 5. Teeth / mandible 6. GIT (rarely) Any illness that develops during or post div.ing must be considered to be diving- related until proven otherwise. Any patient with neurological symptoms in particular needs urgent referral to a specialist in hyperbaric medicine. See also separate document on Dysbarism - Decompression Illness (in Environmental folder). Terminology The term dysbarism encompasses: ● Decompression illness And ● Barotrauma And ● Nitrogen narcosis Decompression illness (DCI) includes: 1. Decompression sickness (DCS) (or in lay terms, the “bends”): ● Type I DCS: ♥ Involves the joints or skin only ● Type II DCS: ♥ Involves all other pain, neurological injury, vestibular and pulmonary symptoms. 2. Arterial gas embolism (AGE): ● Due to pulmonary barotrauma releasing air into the circulation. Epidemiology Diving is generally a safe undertaking. Serious decompression incidents occur approximately only in 1 in 10,000 dives. However, because of high participation rates, there are about 200 - 300 cases of significant decompression illness requiring treatment in Australia each year. It is estimated that 10 times this number of divers experience less severe illness after diving. Physics Boyle’s Law: The air pressure at sea level is 1 atmosphere absolute (ATA). Alternative units used for 1 ATA include: ● 101.3 kPa (SI units) ● 1.013 Bar ● 10 meters of sea water (MSW) ● 760 mm of mercury (mm Hg) ● 14.7 pounds per square inch (PSI) For every 10 meters a diver descends in seawater, the pressure increases by 1 ATA. -
8. Decompression Procedures Diver
TDI Standards and Procedures Part 2: TDI Diver Standards 8. Decompression Procedures Diver 8.1 Introduction This course examines the theory, methods and procedures of planned stage decompression diving. This program is designed as a stand-alone course or it may be taught in conjunction with TDI Advanced Nitrox, Advanced Wreck, or Full Cave Course. The objective of this course is to train divers how to plan and conduct a standard staged decompression dive not exceeding a maximum depth of 45 metres / 150 feet. The most common equipment requirements, equipment set-up and decompression techniques are presented. Students are permitted to utilize enriched air nitrox (EAN) mixes or oxygen for decompression provided the gas mix is within their current certification level. 8.2 Qualifications of Graduates Upon successful completion of this course, graduates may engage in decompression diving activities without direct supervision provided: 1. The diving activities approximate those of training 2. The areas of activities approximate those of training 3. Environmental conditions approximate those of training Upon successful completion of this course, graduates are qualified to enroll in: 1. TDI Advanced Nitrox Course 2. TDI Extended Range Course 3. TDI Advanced Wreck Course 4. TDI Trimix Course 8.3 Who May Teach Any active TDI Decompression Procedures Instructor may teach this course Version 0221 67 TDI Standards and Procedures Part 2: TDI Diver Standards 8.4 Student to Instructor Ratio Academic 1. Unlimited, so long as adequate facility, supplies and time are provided to ensure comprehensive and complete training of subject matter Confined Water (swimming pool-like conditions) 1.