Related Experiment Video
Updated: Jul 16, 2025
07:25
Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
Published on: July 20, 2017
11.6K
Decompression procedures for transfer under pressure ('TUP') diving.
Jan Risberg1,2, Pieter-Jan van Ooij3, Olav Sande Eftedal4
1NUI, Bergen, Norway.
Diving and Hyperbaric Medicine
|September 17, 2023
Summary
Transfer under pressure (TUP) diving uses isobaric transfer for decompression. Six air diving decompression tables were compared, with USN and DCD procedures generally showing longer decompression times but potentially lower decompression sickness risk.
Area of Science:
- Commercial Diving
- Decompression Physiology
- Occupational Safety
Background:
- Growing interest in transfer under pressure (TUP) decompression for commercial diving.
- TUP bridges surface-oriented and saturation diving, involving isobaric transfer from a bell to a chamber.
- This method aims to optimize decompression procedures for divers.
Purpose of the Study:
- To compare six international decompression tables used in air diving.
- To evaluate differences in total decompression time (TDT), oxygen breathing time, and gradient factors (GF high/low).
- To assess surrogate measures for estimating decompression sickness probability (PDCS).
Main Methods:
- Comparative analysis of six decompression tables: DadCoDat (DCD), Defence and Civil Institute of Environmental Medicine (DCIEM), Comex MT92, and United States Navy (USN).
- Evaluation of TDT, oxygen breathing time, GF high, and GF low as outcome measures.
- Assessment of allowances and restrictions for repetitive diving across procedures.
Main Results:
- USN and DCD tables generally recommended longer TDT and oxygen breathing time with lower GF high compared to MT92 and DCIEM.
- USN procedures exhibited significantly higher GF low due to shallower first stops.
- Repetitive diving allowances varied extensively among the six procedures.
Conclusions:
- Experimental validation is lacking for all tables, preventing definitive conclusions on PDCS differences.
- All tables are internationally recognized, with selection potentially influenced by factors beyond PDCS.
- USN and DCD procedures are anticipated to offer lower PDCS than MT92 and DCIEM, though the extent is unknown.
More Related Videos
03:24Author Spotlight: Development and Application of a Novel Suture Technique for Annular Fibrosus Repair in Percutaneous Transforaminal Endoscopic Discectomy
Published on: January 26, 2024
836
09:22Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus SCUVA
Published on: October 31, 2011
13.1K
Related Concept Videos
01:21Tracheostomy Decannulation
232
Tracheostomy decannulation is a significant milestone in the liberation of mechanically ventilated patients. Despite its importance, there is no universally accepted protocol for this procedure. This demands an evidence-based, individualized approach.
Description of the Procedure
Decannulation refers to the permanent removal of the tracheostomy tube, signaling the resolution of the condition that initially necessitated the tracheostomy. The process requires a well-coordinated interplay between...
Description of the Procedure
Decannulation refers to the permanent removal of the tracheostomy tube, signaling the resolution of the condition that initially necessitated the tracheostomy. The process requires a well-coordinated interplay between...
232
01:26Endoscopic Studies II: Thoracocentesis
323
Thoracentesis(Thoracocentesis), commonly known as pleural tap, is a medical procedure where a 22 gauge needle is inserted into the pleural space, the area between the lung and chest wall. This procedure is commonly performed to diagnose or treat various respiratory disorders.
Description
Excess pleural fluid or air may accumulate in some respiratory disorders in the thoracic cavity. To treat pleural effusion, a physician conducts thoracentesis by carefully piercing the chest wall and entering...
Description
Excess pleural fluid or air may accumulate in some respiratory disorders in the thoracic cavity. To treat pleural effusion, a physician conducts thoracentesis by carefully piercing the chest wall and entering...
323
01:24Pressure Relationships in Thoracic Cavity
2.5K
Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs...
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs...
2.5K
01:11Buoyancy and Stability for Submerged and Floating Bodies
1.9K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
1.9K
01:27Pneumothorax-II
192
Pneumothorax is a medical condition defined by the buildup of air in the pleural space between the lungs and the chest wall. This accumulation of air can lead to partial or complete lung collapse, resulting in a range of clinical manifestations. Understanding the clinical presentation and effective management strategies is crucial for healthcare professionals in providing timely and appropriate care to individuals with pneumothorax.
Clinical Manifestations:
Clinical Manifestations:
192
01:19Assessing Blood pressure using a doppler ultrasound
1.4K
To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
1.4K