Obstructive sleep apnea, the most common type, occurs when an airway collapses or becomes blocked.
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With such apnea, the airway collapses or becomes blocked during sleep, according to the National Institutes of Health.
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If it becomes blocked up by customs checks, tailbacks of lorries would quickly form on roads leading to Dover.
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They occur when a blood vessel becomes blocked by fatty deposits and blood has trouble passing through to the brain.
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Their vision becomes blocked on that side, and they may also lose some ability to recognize where sounds are coming from.
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With a myocardial infarction, one of the arteries that supplies blood to the heart becomes blocked, depriving the heart of oxygenated blood.
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In obstructive sleep apnea, the airway becomes blocked or collapses, which can lead to pauses in breathing that might wake you up.
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Diverticulitis — the suffix "itis" indicates inflammation — typically occurs when a diverticulum becomes blocked by a piece of hard stool, called a fecalith.
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Heart attacks occur when an artery leading to the heart becomes blocked, stopping the flow of blood to the muscle and damaging it.
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In this way, even if an artery becomes blocked and causes a heart attack, the heart will still have other ways to get oxygen.
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It began with a pulmonary embolism, which is a condition in which one or more arteries in the lungs becomes blocked by a blood clot.
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A stroke occurs when a vessel carrying blood to the brain becomes blocked or bursts, depriving the brain of the essential oxygen and nutrients it needs to survive.
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Some 2,000 people have faced mandatory evacuations and another 2,000 in coastal communities may be forced to leave their homes if State Highway 130, their last exit, becomes blocked.
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When one of these becomes blocked, blood flow to part of the heart is cut off, resulting in a myocardial infarction, or heart attack — which can cause erratic heartbeats and sudden blackouts.
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Fast treatment can make all the difference in patients experiencing an ischemic stroke - the most common type - which occurs when an artery supplying blood to the brain becomes blocked by a clot.
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Users in China may have to swap VPNs if theirs becomes blocked, but having one is a necessity for anyone wanting unfettered access to foreign websites, from news sites to social media and Google.
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If that opening becomes blocked or closed off—either by a piece of stool, a tumor, or by inflammation resulting from an infection—the bacteria and mucus that flow in and out of the appendix can't escape.
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According to the Mayo Clinic, moyamoya disease, the cause of which is unknown, is an uncommon blood vessel disorder where the carotid artery becomes blocked or narrowed, resulting in a loss of blood flow to the brain.
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They focused on major coronary events, such as heart attacks and strokes, including hemorrhagic strokes -- when a blood vessel bursts in the brain due, usually, to uncontrolled high blood pressure -- and ischemic strokes -- when a blood vessel feeding the brain becomes blocked, usually by a blood clot.
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Though the surgery went well, what followed was a six-day battle with a pulmonary embolism (a condition in which one or more arteries in the lungs becomes blocked by a blood clot) that led to multiple surgeries and a handful of additional medical troubles for the new mom.
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Though the surgery went well, what followed was a six-day battle with a pulmonary embolism (a condition in which one or more arteries in the lungs becomes blocked by a blood clot) that led to multiple surgeries and a handful of additional medical troubles for the new mom.
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The Worst That Can HappenIf your friend's blood pressure shoots up super high (or he starts dealing with other cardiovascular risk factors, like if he takes up smoking, gains a lot of weight, or has Type 2 diabetes) his arteries could become so damaged that blood flow to the heart becomes blocked, triggering a heart attack.
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Rafting is popular on the Bolshaya Kokshaga in the spring time, from April-May. In summer the river become shallow and the riverbed becomes blocked with logs floating downstreams.
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A Bartholin's gland cyst develops when the duct that drains the gland becomes blocked. Blockage may be caused by an infection or a mucus plug. The secretions from the Bartholin's gland are retained, forming a cyst.
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This is a length of tubing with holes punched into it. If used, it will normally be positioned below the packer and will offer an alternative entry path for reservoir fluids into the tubing in case the shoe becomes blocked, for example, by a stuck perforation gun.
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When using a steam wand, a slight but audible hissing sound occurs when the air enters the milk, mainly due to microscopic cavitation."How To Steam Milk", latteartguide.com A louder screaming sound may be heard if the steam orifice becomes blocked or the machine cannot pump enough air.
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The sheets are placed into a filtering frame, sanitized (with boiling water, for example) and then used to filter the beer. The sheets can be flushed if the filter becomes blocked. The sheets are usually disposable and are replaced between filtration sessions. Often the sheets contain powdered filtration media to aid in filtration.
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Two taxa, the corallines and Hildenbrandiaceae, bear conceptacles, although the striking difference between their formation indicates that the conceptacles are not homologous. Similar structures also exist: cryptostomata are similar to conceptacles but differ having only hairs and are sterile; caecostomata, are found only in Fucus distichus, in these the ostiole becomes blocked during development.
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In fact, the Waikato River changes its route quite regularly, as eruptions occur in the Taupo Volcanic Zone, and the river channel becomes blocked. Many lakes and swamps in the Waikato Basin represent old routes. Pumice from the Taupo Volcanic Zone has been deposited throughout the Waipa and Waikato Basins, and the Hauraki Plains, forming excellent soils and swampland.
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A Bartholin's cyst occurs when a Bartholin's gland within the labia becomes blocked. Small cysts may result in minimal symptoms. Larger cysts may result in swelling on one side of the vagina, as well as pain during sex or walking. If the cyst becomes infected, an abscess can occur, which is typically red and very painful.
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Punctoplasty is a surgical procedure to restore proper drainage of tears when the lacrimal punctum (puncta lacrimalia) becomes blocked in one or both eyes. If a blockage is present in the puncti, doctors may suggest a procedure called punctoplasty, performed to widen the drain opening. This usually takes 20–30 minutes and is performed under local anesthesia.
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Lake breakout is the collapse of a lake, usually of high-altitude. High- altitude lakes tend to form in volcanic craters - where they are called crater lakes - or in valleys dammed as the result of earthquakes or glacial or volcanic deposition. Lake breakouts are most common a few weeks or months after a volcanic eruption as a river becomes blocked by volcanic debris.
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Anal fistulae originate from the anal glands, which are located between the internal and external anal sphincter and drain into the anal canal. If the outlet of these glands becomes blocked, an abscess can form which can eventually extend to the skin surface. The tract formed by this process is a fistula. Abscesses can recur if the fistula seals over, allowing the accumulation of pus.
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The reason the characteristics of the field are conserved comes from the concept of blocking temperature (also known as closure temperature in geochronology). This temperature is where the system becomes blocked against thermal agitation at lower temperatures. Therefore, some minerals exhibit remnant magnetization. One problem that arises in the determination of remnant (or fossil) magnetization is that if the temperature rises above this point, the magnetic history is destroyed.
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The arrangement of the brain's arteries into the circle of Willis creates redundancy (analogous to engineered redundancy) for collateral circulation in the cerebral circulation. If one part of the circle becomes blocked or narrowed (stenosed) or one of the arteries supplying the circle is blocked or narrowed, blood flow from the other blood vessels can often preserve the cerebral perfusion well enough to avoid the symptoms of ischemia.
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If coolant flow is restricted, heating capacity will be reduced or even lost altogether if the heater core becomes blocked. Control valves may also clog or get stuck. Where a blend door is used instead of a control valve as a method of controlling the air's heating amount, the door itself or its control mechanism can become stuck due to thermal expansion. If the climate control unit is automatic, actuators can also fail.
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The sheets are manufactured to allow only particles smaller than a given size through, and the brewer is free to choose how finely to filter the beer. The sheets are placed into the filtering frame, sterilized (with hot water, for example) and then used to filter the beer. The sheets can be flushed if the filter becomes blocked, and usually the sheets are disposable and are replaced between filtration sessions. Often the sheets contain powdered filtration media to aid in filtration.
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In the most basic of circuits, if the current falls below the holding current even briefly, the circuit is turned 'OFF' (becomes blocked). However, complex circuits and devices may have different delays built-in between the time the current falls below this level and the time the device turns 'OFF'. Whether a device turns 'ON' when current is restored is a design issue. The current necessary to restore the circuit to the 'ON' state, called the "threshold current" (See threshold voltage), may be much greater than the holding current, or only very slightly more.
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This causes the flat bottom of the capsule to rupture, as it is made of thinner foil than the rest of the capsule. The base of the capsule holder (on which the capsule sits) has a number of raised squares which cause the foil to rupture at these points. The brewed coffee exits the capsule through these rupture holes and flows through a funnel nozzle into the coffee cup. As in pressure cookers, a safety pressure release valve inside the brewing chamber prevents an explosion from occurring if the normal coffee exhaust path becomes blocked.
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With static routing, small networks may use manually configured routing tables. Larger networks have complex topologies that can change rapidly, making the manual construction of routing tables unfeasible. Nevertheless, most of the public switched telephone network (PSTN) uses pre-computed routing tables, with fallback routes if the most direct route becomes blocked (see routing in the PSTN). Dynamic routing attempts to solve this problem by constructing routing tables automatically, based on information carried by routing protocols, allowing the network to act nearly autonomously in avoiding network failures and blockages.
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The contestants enter the Memory Maze through the single room on the first row and must always proceed ahead, left, or right. They may not return to any previously visited rooms or back up past their current row. When they answer a question correctly or complete a Panic Room challenge, they may move ahead into the next row if they wish, or go to either side as permitted. If the contestants answer a question incorrectly or fail to complete a Panic Room challenge, the door in front of them becomes blocked and they must move to one side or the other.
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In the southern hemisphere, subtropical cyclones are regularly observed across southern portions of the Mozambique Channel. Most subtropical cyclones form when a deep cold-core extratropical cyclone drops down into the subtropics. The system becomes blocked by a high latitude ridge, and eventually sheds its frontal boundaries as its source of cool and dry air from the high latitudes diverts away from the system. Temperature differences between the 500 hPa pressure level and the sea surface temperatures initially exceed the dry adiabatic lapse rate, which causes an initial round of thunderstorms to form at a distance east of the center.
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Examples of possible complications include shunt malfunction, shunt failure, and shunt infection, along with infection of the shunt tract following surgery (the most common reason for shunt failure is infection of the shunt tract). Although a shunt generally works well, it may stop working if it disconnects, becomes blocked (clogged) or infected, or it is outgrown. If this happens, the CSF begins to accumulate again and a number of physical symptoms develop (headaches, nausea, vomiting, photophobia/light sensitivity), some extremely serious, such as seizures. The shunt failure rate is also relatively high (of the 40,000 surgeries performed annually to treat hydrocephalus, only 30% are a person's first surgery) and people not uncommonly have multiple shunt revisions within their lifetimes.
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The stakes are installed on the downhill side of the fence, and the bottom edge of the fabric can be trenched into the soil and backfilled on the uphill side, although it is quite difficult to move the trenched "spoil" from the downside to the upside of the trench. The design/placement of the silt fence should create a pooling of runoff, which then allows sedimentation to occur. Water can seep through the silt fence fabric, but the fabric often becomes "blocked off" with fine soil particles (all sediment-retention devices have this challenge, and none of them "filter" storm water for very long). A few hours after a storm event, the fabric can be "disturbed" in order to dislodge the fines, and allow clean water to flow through.
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He is persuaded to attempt to escape from the camp, during which a guard is seriously injured and Raoul is unjustly blamed for it. He is therefore sent to a prison ship in Plymouth, from which he escapes disguised as a woman, with the help of money from Juliana. The road on which Raoul (disguised as a Spanish lady to account for his accent) is travelling, becomes blocked by a fallen tree and a fellow passenger, Captain Hervey Barrington - currently without a ship and on half- pay - offers his assistance and invites Raoul to spend the night at his nearby house. Here, Hervey's sister Lavinia discovers Raoul's secret and Hervey locks Raoul in the spare bedroom for the night, intending to turning him over to the authorities in the morning.
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In a multi-story building, an internal stairway (away from broken windows) often acts as a safe haven, due to the stairs reinforcing the walls and blocking any major debris falling from above. If a stairway is lined with windows, then there would be the danger of flying glass, so an interior stairway, or small inner room, would be preferable. In private homes, some similar stairway rooms have been used, or an interior room/closet kept clear to quickly allow entry when a storm is seen or heard approaching (the wind roar intensifies, sounding like a swift "freight train" coming nearer, louder). With weeks or months to prepare, an interior safe room can be constructed, with space for emergency water, food and flashlights, and a telephone to call for rescue if the exit becomes blocked by falling debris.
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Consider two tasks H and L, of high and low priority respectively, either of which can acquire exclusive use of a shared resource R. If H attempts to acquire R after L has acquired it, then H becomes blocked until L relinquishes the resource. Sharing an exclusive-use resource (R in this case) in a well-designed system typically involves L relinquishing R promptly so that H (a higher priority task) does not stay blocked for excessive periods of time. Despite good design, however, it is possible that a third task M of medium priority (p(L) < p(M) < p(H), where p(x) represents the priority for task (x)) becomes runnable during L's use of R. At this point, M being higher in priority than L, preempts L (since M does not depend on R), causing L to not be able to relinquish R promptly, in turn causing H—the highest priority process—to be unable to run (that is, H suffers unexpected blockage indirectly caused by lower priority tasks like M).
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