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In one rare instance , a woman who had practiced EA reported to an emergency department with orbital subperiosteal hematoma, or a hemorrhage in the eyeball.

If your partner has stopped breathing, immediately call your local emergency service. Then begin CPR. If you know this lifesaving technique , you can perform it right away.

You may just need a few minutes to restore blood flow and oxygen. They can help you learn the proper anatomy, answer questions, and direct you to additional resources.

You can also seek tutorials through classes at local adult shops. Many of these venues host workshops or training sessions.

Keep in mind that many experts actively encourage individuals to steer clear of EA. It can quickly jump from a fun sexual activity to a dangerous pursuit.

One in five friends have tried kinky sex. Plus, science shows there may be benefits to experimenting in the bedroom — are you ready?

Voyeurism can be a normal interest in watching people undress or engage in sexual activity. It can also cause problems for both the voyeur and the….

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It can also delay orgasm…. Medically reviewed by Janet Brito, Ph. The amount processed during each breath depends on the tidal volume of that breath.

Towards the end of inhalation the bellows bottoms out and activates an addition valve, in much the way that a regulator diaphragm activates the demand valve , to make up the gas discharged by the inner bellows.

This type of rebreather therefore tends to operate at a minimal volume. As a result, gas endurance is from 10 times to four times that of open circuit, and depends on breathing rate and depth in the same way as for open circuit.

Oxygen fraction in the loop depends on the discharge ratio, and to a lesser extent on the breathing rate and work rate of the diver.

As some gas is recycled after breathing, the oxygen fraction will always be lower than that of the make-up gas, but can closely approximate the make-up gas after a loop flush, so the gas is generally chosen to be breathable at maximum depth, which allows it to be used for open circuit bailout.

The loop gas oxygen fraction will increase with depth, as the mass rate of oxygen used metabolically remains almost constant with a change in depth.

This is the opposite tendency of what is done in a closed circuit rebreather, where the oxygen partial pressure is controlled to be more or less the same within limits throughout the dive.

Passive addition rebreathers with small discharge ratios may become hypoxic near the surface when moderate oxygen fraction supply gas is used.

The depth compensating systems discharge a portion of the diver's tidal volume which varies in inverse proportion to the absolute pressure.

This system will provide an approximately fixed oxygen fraction regardless of depth, when used with the same make-up gas, because the effective mass discharge remains constant.

Partially depth compensating systems are part way between the fixed ratio and the depth compensating systems. They provide a high discharge ratio near the surface, but the discharge ratio is not fixed either as a proportion of respired volume or mass.

Gas oxygen fraction is more difficult to calculate, but will be somewhere between the limiting values for fixed ratio and fully compensated systems.

An active addition system adds feed gas to the breathing circuit and excess gas is dumped to the environment. These rebreathers tend to operate near maximum volume.

The most common system of active addition of make-up gas in semi-closed rebreathers is by use of a constant mass flow injector, also known as choked flow.

This is easily achieved by using a sonic orifice, as provided the pressure drop over the orifice is sufficient to ensure sonic flow, the mass flow for a specific gas will be independent of the downstream pressure.

Gas addition is independent of oxygen use, and the gas fraction in the loop is strongly dependent on exertion of the diver — it is possible to dangerously deplete the oxygen by excessive physical exertion.

Only one model using this gas mixture control principle has been marketed. The principle of operation is to add a mass of oxygen that is proportional to the volume of each breath.

This approach is based on the assumption that the volumetric breathing rate of a diver is directly proportional to metabolic oxygen consumption, which experimental evidence indicates is close enough to work.

The fresh gas addition is made by controlling the pressure in a dosage chamber proportional to the counterlung bellows volume.

The dosage chamber is filled with fresh gas to a pressure proportional to bellows volume, with the highest pressure when the bellows is in the empty position.

When the bellows fills during exhalation, the gas is released from the dosage chamber into the breathing circuit, proportional to the volume in the bellows during exhalation, and is fully released when the bellows is full.

Excess gas is dumped to the environment through the overpressure valve after the bellows is full. The result is the addition of a mass of gas proportional to ventilation volume, and the oxygen fraction is stable over the normal range of exertion.

The volume of the dosage chamber is matched to a specific supply gas mixture, and is changed when the gas is changed.

Military, photographic, and recreational divers use closed circuit rebreathers because they allow long dives and produce no bubbles. A major function of the closed circuit rebreather is to control the oxygen partial pressure in the loop and to warn the diver if it becomes dangerously low or high.

Too low a concentration of oxygen results in hypoxia leading to unconsciousness and ultimately death. Too high a concentration of oxygen results in hyperoxia, leading to oxygen toxicity , a condition causing convulsions which can make the diver lose the mouthpiece when they occur underwater, and can lead to drowning.

The monitoring system uses oxygen-sensitive electro-galvanic fuel cells to measure the partial pressure of oxygen in the loop.

The partial pressure of oxygen in the loop can generally be controlled within reasonable tolerance of a fixed value. This set point is chosen to provide an acceptable risk of both long-term and acute oxygen toxicity, while minimizing the decompression requirements for the planned dive profile.

The gas mixture is controlled by the diver in manually controlled closed circuit rebreathers. The diver can manually control the mixture by adding diluent gas or oxygen.

Adding diluent can prevent the loop gas mixture becoming too oxygen rich, and adding oxygen is done to increase oxygen concentration.

In fully automatic closed-circuit systems, an electronically controlled solenoid valve injects oxygen into the loop when the control system detects that the partial pressure of oxygen in the loop has fallen below the required level.

Electronically controlled CCRs can be switched to manual control in the event of some control system failures. Addition of gas to compensate for compression during descent is usually done by an automatic diluent valve.

There have been a few rebreather designs e. The Russian IDA71 military and naval rebreather was designed to be run in this mode or as an ordinary rebreather.

If used underwater, the liquid-oxygen tank must be well insulated against heat coming in from the water. As a result, industrial sets of this type may not be suitable for diving, and diving sets of this type may not be suitable for use out of water.

The set's liquid oxygen tank must be filled immediately before use. They include these types:. A cryogenic rebreather removes the carbon dioxide by freezing it out in a "snow box" by the low temperature produced as liquid oxygen evaporates to replace the oxygen used.

Its ppO 2 could be set to anything from 0. The diluent could be either nitrogen or helium depending on the depth of the dive. The partial pressure of oxygen was controlled by temperature, which was controlled by controlling the pressure at which liquid nitrogen was allowed to boil, which was controlled by an adjustable pressure relief valve.

No control valves other than the nitrogen pressure relief valve were required. Low temperature was also used to freeze out up to grams of carbon dioxide per hour from the loop, corresponding to an oxygen consumption of 2 litres per minute as carbon dioxide will freeze out of the gaseous state at If oxygen was consumed faster due to a high workload, a regular scrubber was needed.

No electronics were needed as everything followed the setting of the nitrogen release pressure from the cooling unit, and the refrigeration by evaporation of liquid nitrogen maintained a steady temperature until the liquid nitrogen was exhausted.

The loop gas flow was passed through a counterflow heat exchanger, which re-heated the gas returning to the diver by chilling the gas headed for the snow box the cryogenic scrubber.

The first prototype, the SG, was completed and shallow-water tested in October The S was announced in , [28] [29] but the systems were never marketed.

Cryogenic rebreathers were widely used in Soviet oceanography in the period to The widest variety of rebreather types is used in diving, as the consequences of breathing under pressure complicate the requirements, and a large range of options are available depending on the specific application and available budget.

A diving rebreather is safety-critical life-support equipment — some modes of failure can kill the diver without warning, others can require immediate appropriate response for survival.

Oxygen rebreathers are also sometimes used when decompressing from a deep open-circuit dive, [ citation needed ] as breathing pure oxygen helps the nitrogen diffuse out of the body tissues more rapidly, and the use of a rebreather may be more convenient for long decompression stops.

Oxygen rebreathers are no longer commonly used in recreational diving because of the depth limit imposed by oxygen toxicity, but are extensively used for military attack swimmer applications where greater depth is not required, due to their simplicity, light weight and compact size.

Semi-closed circuit rebreathers used for diving may use active or passive gas addition, and the gas addition systems may be depth compensated.

They use a mixed supply gas with a higher oxygen fraction than the steady state loop gas mixture. Usually only one gas mixture is used, but it is possible to switch gas mixtures during a dive to extend the available depth range of some SCRs.

Closed circuit diving rebreathers may be manually or electronically controlled, and use both pure oxygen and a breathable mixed gas diluent.

A helium reclaim system or push-pull system is used to recover helium based breathing gas after use by the diver when this is more economical than losing it to the environment in open circuit systems.

The recovered gas is passed through a scrubber system to remove carbon dioxide, filtered to remove odours, and pressurised into storage containers, where it may be mixed with oxygen to the required composition for re-use.

The life support system provides breathing gas and other services to support life for the personnel under pressure in the accommodation chambers and closed diving bell.

It includes the following components: [37]. The life support system for the bell provides and monitors the main supply of breathing gas, and the control station monitors the deployment and communications with the divers.

Primary gas supply, power and communications to the bell are through a bell umbilical, made up from a number of hoses and electrical cables twisted together and deployed as a unit.

The accommodation life support system maintains the chamber environment within the acceptable range for health and comfort of the occupants.

Temperature, humidity, breathing gas quality sanitation systems and equipment function are monitored and controlled. Different design criteria apply to SCBA rebreathers for use only out of the water:.

Mountaineering rebreathers provide oxygen at a higher concentration than available from atmospheric air in a naturally hypoxic environment.

They need to be lightweight and to be reliable in severe cold including not getting choked with deposited frost.

Everest has a greater oxygen partial pressure than breathing air at sea level. This results in being able to exert greater physical effort at altitude.

Both chemical and compressed gas oxygen have been used in experimental closed-circuit oxygen systems — the first on Mount Everest in The expedition used closed-circuit oxygen equipment developed by Tom Bourdillon and his father for the first assault team of Bourdillon and Evans ; with one "dural" l compressed oxygen cylinder and soda lime canister the second successful assault team of Hillary and Tenzing used open-circuit equipment.

An atmospheric diving suit is a small one-man articulated submersible of roughly anthropomorphic form, with limb joints which allow articulation under external pressure while maintaining an internal pressure of one atmosphere.

Breathing gas supply may be surface supplied by umbilical, or from a rebreather carried on the suit. An emergency gas supply rebreather may also be fitted to a suit with either surface supply or rebreather for primary breathing gas.

Similar requirement and working environment to mountaineering, but weight is less of a problem. The Soviet IDA rebreather was also manufactured in a high altitude version, which was operated as an oxygen rebreather.

Anaesthetic machines can be configured as rebreathers to provide oxygen and anaesthetic gases to a patient during surgery or other procedures that require sedation.

An absorbent is present in the machine to remove the carbon dioxide from the loop. Both semi-closed and fully closed circuit systems may be used for anaesthetic machines, and both push-pull pendulum two directional flow and one directional loop systems are used.

The anaesthetic machine can also provide gas to ventilated patients who cannot breathe on their own. Anaesthesia personnel train for equipment failures using medical simulation techniques.

One of the functions of a space suit is to provide the wearer with breathing gas. This can be done via an umbilical from the life-support systems of the spacecraft or habitat, or from a primary life support system carried on the suit.

Both of these systems involve rebreather technology as they both remove carbon dioxide from the breathing gas and add oxygen to compensate for oxygen used by the wearer.

Space suits usually use oxygen rebreathers as this allows a lower pressure in the suit which gives the wearer better freedom of movement. Submarines , underwater habitats , bomb shelters, space stations , and other living spaces occupied by several people over medium to long periods on a limited gas supply, are equivalent to closed circuit rebreathers in principle, but generally rely on mechanical circulation of breathing gas through the scrubbers.

Although there are several design variations of diving rebreather, all types have a gas-tight loop that the diver inhales from and exhales into.

The loop consists of several components sealed together. The diver breathes through a mouthpiece or a fullface mask.

This is connected to one or more tubes ducting inhaled and exhaled gas between the diver and a counterlung or breathing bag. This holds gas when it is not in the diver's lungs.

The loop also includes a scrubber containing carbon dioxide absorbent to remove the carbon dioxide exhaled by the diver.

Attached to the loop there will be at least one valve allowing addition of gases, such as oxygen and perhaps a diluting gas, from a gas storage into the loop.

There may be valves allowing venting of gas from the loop. The loop configuration uses a one directional circulation of the breathing gas which on exhalation leaves the mouthpiece, passes through a non-return valve into the exhalation hose, and then through the counterlung and scrubber, to return to the mouthpiece through the inhalation hose and another non-return valve when the diver inhales.

The pendulum configuration uses a two-directional flow. Exhaled gas flows from the mouthpiece through a single hose to the scrubber, into the counterlung, and on inhalation the gas is drawn back through the scrubber and the same hose back to the mouthpiece.

The pendulum system is structurally simpler, but inherently contains a larger dead space of unscrubbed gas in the combined exhalation and inhalation tube, which is rebreathed.

There are conflicting requirements for minimising the volume of dead space while minimising the flow resistance of the breathing passages.

The diver breathes from the rebreather circuit through a bite-grip mouthpiece or an oro-nasal mask which may be part of a full-face mask or diving helmet.

The mouthpiece is connected to the rest of the rebreather by breathing hoses. On loop configured rebreathers the mouthpiece is usually the place where the non-return valves for the loop are fitted.

It is used to close the loop at the surface to allow the diver to breathe atmospheric air, and may also be used underwater to isolate the loop so that it will not flood if the mouthpiece is taken out of the mouth.

An important safety device when carbon dioxide poisoning occurs. Flexible corrugated synthetic rubber hoses are used to connect the mouthpiece to the rest of the breathing circuit, as these allow free movement of the diver's head.

These hoses are corrugated to allow greater flexibility while retaining a high resistance to collapse. The hoses are designed to provide low resistance to flow of the breathing gas.

A single breathing hose is used for pendulum push-pull configuration, and two hoses for a one-way loop configuration. The counterlung is a part of the loop which is designed to change in volume by the same amount as the user's tidal volume when breathing.

This lets the loop expand and contract when the user breathes, letting the total volume of gas in the lungs and the loop remain constant throughout the breathing cycle.

The volume of the counterlung should allow for the maximum likely breath volume of a user, but does not generally need to match the vital capacity of all possible users.

Underwater, the position of the counterlung — on the chest, over the shoulders, or on the back — has an effect on the hydrostatic work of breathing.

This is due to the pressure difference between the counterlung and the diver's lung caused by the vertical distance between the two.

Recreational, technical and many professional divers will spend most of their time underwater swimming face down and trimmed horizontally.

Counterlungs should function well with low work of breathing in this position, and with the diver upright.

The design of the counterlungs can also affect the swimming diver's streamlining due to location and shape of the counterlungs themselves.

For use out of water, counterlung position does not affect work of breathing and it can be positioned wherever convenient.

For example, in an industrial version of the Siebe Gorman Salvus the breathing bag hangs down by the left hip.

A rebreather which uses rubber counterlungs which are not in an enclosed casing should be sheltered from sunlight when not in use, to prevent the rubber from perishing due to ultraviolet light.

Most passive addition semi-closed diving rebreathers control the gas mixture by removing a fixed volumetric proportion of the exhaled gas, and replacing it with fresh feed gas from a demand valve, which is triggered by low volume of the counterlung.

This is done by using concentric bellows counterlungs — the counterlung is configured as a bellows with a rigid top and bottom, and has a flexible corrugated membrane forming the side walls.

There is a second, smaller bellows inside, also connected to the rigid top and bottom surfaces of the counterlung, so that as the rigid surfaces move towards and away from each other, the volumes of the inner and outer bellows change in the same proportion.

The exhaled gas expands the counterlungs, and some of it flows into the inner bellows. On inhalation, the diver only breathes from the outer counterlung — return flow from the inner bellows is blocked by a non-return valve.

The inner bellows also connects to another non-return valve opening to the outside environment, and thus the gas from the inner bellows is dumped from the circuit in a fixed proportion of the volume of the inhaled breath.

If the counterlung volume is reduced sufficiently for the rigid cover to activate the feed gas demand valve, gas will be added until the diver finishes that inhalation.

The exhaled gases are directed through the chemical scrubber, a canister full of a suitable carbon dioxide absorbent such as a form of soda lime , which removes the carbon dioxide from the gas mixture and leaves the oxygen and other gases available for re-breathing.

Some of the absorbent chemicals are produced in granular format for diving applications, such as Atrasorb Dive, Sofnolime , Dragersorb , or Sodasorb.

The carbon dioxide passing through the scrubber absorbent is removed when it reacts with the absorbent in the canister; this chemical reaction is exothermic.

This reaction occurs along a "front" which is a region across the flow of gas through the soda-lime in the canister. This front moves through the scrubber canister, from the gas input end to the gas output end, as the reaction consumes the active ingredients.

This front would be a zone with a thickness depending on the grain size, reactivity, and gas flow velocity because the carbon dioxide in the gas going through the canister needs time to reach the surface of a grain of absorbent, and then time to penetrate to the middle of each grain of absorbent as the outside of the grain becomes exhausted.

Eventually gas with remaining carbon dioxide will reach the far end of the canister and "breakthrough" will occur.

After this the carbon dioxide content of the scrubbed gas will tend to rise as the effectiveness of the scrubber falls until it becomes noticeable to the user, then unbreathable.

In larger systems, such as recompression chambers , a fan is used to pass gas through the canister. In rebreather diving, the typical effective duration of the scrubber will be half an hour to several hours of breathing, depending on the granularity and composition of the soda lime, the ambient temperature, the design of the rebreather, and the size of the canister.

In some dry open environments, such as a recompression chamber or a hospital, it may be possible to put fresh absorbent in the canister when break through occurs.

During ascent the gas in the breathing circuit will expand, and must have some way of escape before the pressure difference causes injury to the diver or damage to the loop.

The simplest way to do this is for the diver to allow excess gas to escape around the mouthpiece or through the nose, but a simple overpressure valve is reliable and can be adjusted to control the permitted overpressure.

The overpressure valve is typically mounted on the counterlung and in military diving rebreathers it may be fitted with a diffuser.

Some military diving rebreathers have a diffuser over the blowoff valve, which helps to conceal the diver's presence by masking the release of bubbles, by breaking them up to sizes which are less easily detected.

Many rebreathers have "water traps" in the counterlungs or scrubber casing, to stop large volumes of water from entering the scrubber media if the diver removes the mouthpiece underwater without closing the valve, or if the diver's lips get slack and let water leak in.

Some rebreathers have manual pumps to remove water from the water traps, and a few of the passive addition SCRs automatically pump water out along with the gas during the exhaust stroke of the bellows counterlung.

Work of breathing is the effort required to breathe. Part of the work of breathing is due to inherent physiological factors, part is due to the mechanics of the external breathing apparatus, and part is due to the characteristics of the breathing gas.

A high work of breathing may result in carbon dioxide buildup in the diver, and reduces the diver's ability to produce useful physical effort.

In extreme cases work of breathing may exceed the aerobic work capacity of the diver, with fatal consequences. Work of breathing of a rebreather has two main components: Resistive work of breathing is due to the flow restriction of the gas passages causing resistance to flow of the breathing gas, and exists in all applications where there is no externally powered ventilation.

Hydrostatic work of breathing is only applicable to diving applications, and is due to difference in pressure between the lungs of the diver and the counterlungs of the rebreather.

This pressure difference is generally due to a difference in hydrostatic pressure caused by a difference in depth between lung and counterlung, but can be modified by ballasting the moving side of a bellows counterlung.

Resistive work of breathing is the sum of all the restrictions to flow due to bends, corrugations, changes of flow direction, valve cracking pressures, flow through scrubber media, etc.

It likes assembling a puzzle. This gives me 4 seconds to take the shot. This couple has posed dressed as a gun-toting gangster and his moll in the painful-looking pose.

One man wrapped himself around his partner as they held their breath for the dangerous portrait. They're never in danger though as I have a rescue body guard on hand at all times.

Hal uses lube and coolant gel to slide the couples inside the bag and ensure there's no friction with the plastic. A household vacuum cleaner then sucks out the oxygen before he dashes back behind the camera to take two quick photos.

Another couple posed in a contorted position inside the bag that managed to ensure they remained decent, despite being stark naked. Two women appear to be a tangle of limbs and hair inside the bag, where they must hold their breath for 10 seconds while the process takes place.

The couples have to hold their breath for about ten seconds or more while the process takes place. He has an assistant standing by to open the bag and he has an oxygen sprayer and gel in case anyone starts to feel ill.

Hal's pictures started as an art project but the craze has taken off and he now receives requests for couples who want a set of the extraordinary pictures.

There is literally no way in which to do this that does not pose some threat of serious injury. This is not something to be done lightly, it requires extensive knowledge of human anatomy and significant self-control during sex to even consider the prospect.

Still, that doesn't make this safe. Nothing is fail-safe. Yet every year hundreds of people think that they have found a safe way to autoerotic asphyxiate Many people are also arrested every year for accidentally killing their partner during suffocation play.

This is actually one of the very few areas of SM that even health professionals involved in the scene have said that there is no way to perform safely.

Considering the variety of areas that SM covers, that says something and not something good. In truth, there is no way to do breath-play without risking cardiac arrest or brain damage from lack of oxygen.

And if you think that this is an area where having a partner limits the danger, then you're wrong. It is in fact just as dangerous either way.

The idea that being with a partner makes this safer is completely illogical. You can take as many safety precautions as you want and this can still potentially become life-threatening.

Many will dispute that they don't do breath-play to the point of unconsciousness or to a dangerous point. Well, that is just the point.

There are far more problems with this than just unintentional unconsciousness. Unconsciousness is not the problem. It is a symptom and you cannot know when unconsciousness hits until it does.

Prolonged use of breath-play can cause permanent damage to the brain, destroying brain cells every time.

There is no way of knowing if your partner is about to go into cardiac arrest or if they are beginning to suffer brain damage from lack of oxygen.

Additionally, potential types of cardiac arrest can occur, such as ventricular fibrillation, when premature ventricular contractions occur as extra pacemaker sites are set off within the heart to counteract the lack of oxygen.

There is no way to predict these just as you cannot predict any type of heart attack. They can occur at any time with any health history.

In the event of cardiac arrest, even with training, the likelihood of saving your partner with CPR is low. So, if they suffer a serious injury from your breath-play, even by the time help would arrive, it would be far too late to save them.

Even as little as 15 seconds of pressure on the carotid artery can cause unconsciousness and any longer can induce serious injury.

Please note All comments are eligible for publication in The News-Letter. Practiced alone, smothering may be dangerous because you may pass out before you can remove the obstruction.

Because the line between safe play and danger is so very fine with EA, most doctors and experts advise against it. The cumulative effect of regular asphyxia can be problematic.

At the same time, the force may break or fracture the hyoid, a bone in the neck that supports the tongue.

Though uncommon, some people may end up aspirating the vomit. That means they somehow manage to get vomit into their airway or lungs.

This can cause long-term breathing problems and increase your risk of infection, among other complications. The chemical makeup of blood changes when oxygen is low.

In one rare instance , a woman who had practiced EA reported to an emergency department with orbital subperiosteal hematoma, or a hemorrhage in the eyeball.

If your partner has stopped breathing, immediately call your local emergency service. Then begin CPR.

If you know this lifesaving technique , you can perform it right away. You may just need a few minutes to restore blood flow and oxygen.

They can help you learn the proper anatomy, answer questions, and direct you to additional resources. You can also seek tutorials through classes at local adult shops.

Many of these venues host workshops or training sessions. Keep in mind that many experts actively encourage individuals to steer clear of EA.

It can quickly jump from a fun sexual activity to a dangerous pursuit. One in five friends have tried kinky sex.

Plus, science shows there may be benefits to experimenting in the bedroom — are you ready? Voyeurism can be a normal interest in watching people undress or engage in sexual activity.

It can also cause problems for both the voyeur and the…. That said, we…. Despite what you may have heard, edging isn't bad for you.

This technique is also known as orgasm control. Although it's more commonly used among…. As more couples explore anal sex, understanding the risks, rewards, and proper strategy is important.

Here's what you need to know about safety and…. When you learn and…. Female ejaculation occurs when fluid — not necessarily urine — is expelled from your urethra during sexual arousal or orgasm.

This is different from…. Cock rings help trap blood in and around the penis during arousal. This can make your erection harder — and slightly larger.

It can also delay orgasm…. Medically reviewed by Janet Brito, Ph. Safety Why people like it Solo vs. Why do people enjoy it?

You can do it to yourself or to a partner. Responsible breath play comes down to three things. Different types carry different risks. Are some side effects to be expected?