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State of reduced carbon dioxide in the blood
Hypocapnia usually results from deep or rapid breathing, known as hyperventilation. Hypocapnia is the opposite of hypercapnia. Short term hypocapnia does
Hypocapnia
Loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold dive
depth, while blackout in consistently shallow water is a consequence of hypocapnia following hyperventilation. Different types of freediving blackout have
Freediving_blackout
Excessive breathing
eliminates more carbon dioxide than the body can produce. This leads to hypocapnia, a reduced concentration of carbon dioxide dissolved in the blood. The
Hyperventilation
Dangerous game of trying to faint
damage or death. The two mechanisms are strangulation and self-induced hypocapnia and work as follows: A ligature such as a belt or rope around the neck
Choking_game
Insufficient breathing
opioid-induced respiratory depression that may help identify at-risk patients. Hypocapnia, which stimulates hypoventilation Obesity; see Obesity hypoventilation
Hypoventilation
Abnormally high tissue carbon dioxide levels
volumes of blood flow compared to ECMO. Hypercapnia is the opposite of hypocapnia, the state of having abnormally reduced levels of carbon dioxide in the
Hypercapnia
Visual dimming caused by hypoxia
blood pressure. Fatigue Hyperventilation, paradoxically: self-induced hypocapnia, such as in the fainting game or in shallow water blackout. Overexertion
Greyout
Alternative physical therapy for asthma
hyperventilation can lead to low carbon dioxide levels in the blood (or hypocapnia), which can subsequently lead to disturbances of the acid-base balance
Buteyko_method
Medical condition involving hyperventilating
are about 98% for hemoglobin saturation) and too little carbon dioxide (hypocapnia) in their blood and other tissues. While oxygen is abundant in the bloodstream
Hyperventilation_syndrome
Medical diagnostic method
be observed as a symptom of hyperventilation syndrome as a result of hypocapnia-induced reduction of calcium levels in the blood. To elicit the sign,
Trousseau sign of latent tetany
Trousseau_sign_of_latent_tetany
Severely deficient supply of oxygen
exposure) Hanging, whether suspension or short drop hanging Self-induced hypocapnia by hyperventilation, as in shallow water or deep water blackout and the
Asphyxia
Drug which widens the lung airways
bronchodilatory effects. Gaseous carbon dioxide also relaxes airway musculature: hypocapnia caused by deliberate hyperventilation increases respiratory resistance
Bronchodilator
Inadequate gas exchange by the respiratory system
blood (hypoxemia) (PaO2) < 60 mmHg with a normal (normocapnia) or low (hypocapnia) level of carbon dioxide (PaCO2) in the blood. The fundamental defect
Respiratory_failure
Normal arterial carbon dioxide levels
living things Hypercapnia – Abnormally high tissue carbon dioxide levels Hypocapnia – State of reduced carbon dioxide in the blood The Free Dictionary - Normocapnia
Normocapnia
U.S. Navy's special operations force
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
United_States_Navy_SEALs
Term used in alternative medicine
reduce blood carbon dioxide (CO2) concentrations and hence to produce hypocapnia, which induces cerebral vasoconstriction and thus causes reduced cerebral
Breathwork_(New_Age)
Physiological phenomenon
edema. Several factors inhibit HPV including increased cardiac output, hypocapnia, hypothermia, acidosis/alkalosis, increased pulmonary vascular resistance
Hypoxic pulmonary vasoconstriction
Hypoxic_pulmonary_vasoconstriction
American engineer, vintner, and former NASA astronaut
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
José_M._Hernández
Australian conservationist (1962–2006)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Steve_Irwin
Disorder involving pauses in breathing during sleep
hypoventilation and post-hyperventilation hypocapnia. The most common cause of CSA is post-hyperventilation hypocapnia secondary to heart failure. This occurs
Sleep_apnea
2006 animal encounter accident
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Death_of_Steve_Irwin
English broadcaster and natural historian (born 1926)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
David_Attenborough
Special forces unit of the British Army
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Special_Air_Service
American novelist and underwater explorer (1931–2020)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Clive_Cussler
Crewed full ocean depth rated submersible
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
DSV_Limiting_Factor
Respiratory impairment caused by submersion in liquid
low carbon dioxide level: a potentially dangerous condition known as hypocapnia. The level of carbon dioxide in the blood after hyperventilation may then
Drowning
French oceanographer and author (1910–1997)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Jacques_Cousteau
Species of fish
hypoxia and hypercapnia individually, and depressed by hyperoxia and hypocapnia individually. Combinations of hypoxia and hypercapnia depress gill usage
Gilled_lungfish
British ocean liner (1907–1915)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
RMS_Lusitania
Human body core temperature below 35 °C (95 °F)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Hypothermia
US Marine Corps special forces unit
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Marine_Raider_Regiment
Pirate Blackbeard's ship
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Queen_Anne's_Revenge
Topics referred to by the same term
involving hyperventilating Cheyne–Stokes respiration, the breathing disorder Hypocapnia, a physiological result of hyperventilating "Hyperventilating" (song)
Hyperventilating
Equipment which allows the user to breathe at hypoxic altitudes
above 5,500 metres (18,000 ft), one can expect significant hypoxemia, hypocapnia and alkalosis, with progressive deterioration of physiological function
High-altitude breathing apparatus
High-altitude_breathing_apparatus
Swimming while inhaling through a snorkel
Snorkelers who hyperventilate to extend sub-surface time can experience hypocapnia if they hyperventilate prior to submerging. This can in turn lead to "shallow
Snorkeling
2018 international rescue mission in Thailand
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Tham_Luang_cave_rescue
Disorder caused by dissolved gases forming bubbles in tissues
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Decompression_sickness
Procedure to collect cerebrospinal fluid
traumatic brain injury, cerebral ischemia, brain abscess, hydrocephalus, hypocapnia or bacterial meningitis. The enzyme lactate dehydrogenase can be measured
Lumbar_puncture
Semi-submersible offshore drilling rig
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Byford_Dolphin
Use of high-pressure water jet for cleaning hard surfaces
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Pressure_washing
Medical issues associated with spaceflight
risks. The effects of space exposure can result in ebullism, hypoxia, hypocapnia, and decompression sickness. In addition to these, there is also cellular
Effect of spaceflight on the human body
Effect_of_spaceflight_on_the_human_body
Nausea caused by motion or perceived motion
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Motion_sickness
Diving incident in the Maldives
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
2026 Dhekunu Kandu cave diving incident
2026_Dhekunu_Kandu_cave_diving_incident
Tactical scuba diver
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Frogman
Early form of diver propulsion vehicle
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Human_torpedo
Polish special forces unit
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
GROM_Military_Unit
Irish safety freediver (1977-2017)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Stephen_Keenan
Type of legal obligation
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Duty_of_care
All Latin and Greek roots beginning with G
capnomancy, capnometer, capnometry, capnomor, capnophile, hypercapnia, hypocapnia capr- goat Latin caper (genitive capri) "goat", also capreolus "wild goat"
List of Greek and Latin roots in English/A–G
List_of_Greek_and_Latin_roots_in_English/A–G
British cave diver who specialises in rescues
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Rick_Stanton
Change in sea level due to gravity
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Tide
Copper helmet with rubberised canvas diving suit and weighted boots
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Standard_diving_dress
Set of detailed instructions to assist in workplace safety
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Standard_operating_procedure
Water current moving away from shore
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Rip_current
Organ system for circulating blood in animals
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Circulatory_system
Injury due to pressure difference between gas filled space and adjoining tissue
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Barotrauma
Canadian astronaut, circled the Moon in 2026 (born 1976)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Jeremy_Hansen
British science fiction writer (1917–2008)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Arthur_C._Clarke
American marine biologist and lecturer
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Sylvia_Earle
Stretch garment for protection from abrasion, UV and stings
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Rash_guard
Medical condition
developing HACE. Prolonged exertion in low oxygen also causes serious hypocapnia, lower carbon dioxide in the bloodstream, which may play a role in HACE
High-altitude_cerebral_edema
US government scientific agency
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
National Oceanic and Atmospheric Administration
National_Oceanic_and_Atmospheric_Administration
USMC deep reconnaissance unit
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
United States Marine Corps Force Reconnaissance
United_States_Marine_Corps_Force_Reconnaissance
English Tudor warship (1511–1545)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Mary_Rose
Tethered underwater mobile device operated by a remote crew
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Remotely operated underwater vehicle
Remotely_operated_underwater_vehicle
Decrease in blood pH due to insufficient breathing
cause hypoventilation but tend to cause stimulation of ventilation and hypocapnia secondary to hypoxia. Hypercapnia only occurs if severe disease or respiratory
Respiratory_acidosis
Italian freediver (born 1992)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Alessia_Zecchini
Acoustic sensing method
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Sonar
British volunteer cave rescue diver
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
John_Volanthen
Medical condition due to rapid exposure to low oxygen at high altitude
commonly in this range. Above 5,500 metres (18,000 ft), marked hypoxemia, hypocapnia, and alkalosis are characteristic of extreme altitudes. Progressive deterioration
Altitude_sickness
Safe isolation of dangerous equipment during maintenance or testing
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Lockout–tagout
Crewed deep-ocean research submersible
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
DSV_Alvin
Special forces unit of the Royal Navy
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Special_Boat_Service
Directional mass flow of oceanic water
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Ocean_current
American astronaut and USAF colonel (born 1967)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Michael_Fincke
Australian anesthesiologist and cave diver
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Richard_Harris_(anaesthetist)
Underwater habitat off Key Largo in the Florida Keys National Marine Sanctuary
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Aquarius_Reef_Base
Australian technical diver (1954–2005)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Dave_Shaw
Diving mode and decompression technique
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Saturation_diving
German filmmaker (1902–2003)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Leni_Riefenstahl
Toxic effects of carbon monoxide
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Carbon_monoxide_poisoning
Firearm firing gyroscopic rockets in the 1960s
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Gyrojet
Consolidating a motor task into memory through repetition
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Muscle_memory
Emergency first response medical treatment
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
First_aid
Jacques Cousteau's oceanographic research ship
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
RV_Calypso
South African diver (1974–1994)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Deon_Dreyer
Unit of pressure equal to one tenth of a bar
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Metre_sea_water
Toxic effects of breathing oxygen at high partial pressures
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Oxygen_toxicity
Equilibrium between buoyancy and weight of an immersed object
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Neutral_buoyancy
Tabulated data to facilitate safe diving ascents
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Decompression_tables
Diving bell for rescuing submariners
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
McCann_Rescue_Chamber
Unstable wave
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Breaking_wave
Japanese divers intended to manually detonate mines on invading ships
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Fukuryu
Scientific study of ocean life
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Marine_biology
Russian multiple world record holding freediver (1962–2015)
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Natalia_Molchanova
Distinct layer of temperature change in a body of water
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Thermocline
Part of the vertebrate circulatory system
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Pulmonary_circulation
Military Engineers of the British Army
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Royal_Engineers
Hyperbaric pressure vessel for human occupancy used in diving operations
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Diving_chamber
Underwater sport of pushing a puck into the opposing goal
syndrome Hydrogen narcosis Nitrogen narcosis Carbon dioxide Hypercapnia Hypocapnia Breathing gas contaminants Carbon monoxide poisoning Immersion related
Underwater_hockey
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