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The smelling salts release ammonia (NH 3) gas, which triggers an inhalation reflex. It causes the muscles that control breathing to work faster by irritating the mucous membranes of the nose and lungs. [7] Fainting can be caused by excessive parasympathetic and vagal activity that slows the heart and decreases perfusion of the brain. [14]
Since paroxysmal nocturnal dyspnea occurs mainly because of heart or lung problems, common risk factors include those that affect the function of the heart and lungs. Risk factors for cardiac diseases include high blood pressure, high cholesterol, diabetes, obesity, and a lifestyle lacking exercise and a healthy diet.
Sleep inversion may be a symptom of elevated blood ammonia levels [2] and is often an early symptom of hepatic encephalopathy. [3] Sleep inversion is a feature of African trypanosomiasis, after which the disease takes its common name, "African sleeping sickness"; [4] sleep-wake cycle disturbances are the most common indication that the disease has reached the stage where infection spreads into ...
Disrupted sleep and sleep loss interferes with the brain's ability to filter out bad memories, which could contribute to a range of mental health conditions, such as anxiety, depression, and post ...
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The underlying mechanism is believed to involve the buildup of ammonia in the blood, a substance that is normally removed by the liver. [2] The diagnosis is typically based on symptoms after ruling out other potential causes. [2] [6] It may be supported by blood ammonia levels, an electroencephalogram, or computer tomography (CT scan) of the ...
These processes cause the typical symptoms of fainting: pale skin, rapid breathing, nausea, and weakness of the limbs, particularly of the legs. [3] If the ischemia is intense or prolonged, limb weakness progresses to collapse. [3] The weakness of the legs causes most people to sit or lie down if there is time to do so.
Factors that may induce or sustain [2] hyperventilation include: physiological stress, anxiety or panic disorder, high altitude, head injury, stroke, respiratory disorders such as asthma, pneumonia, or hyperventilation syndrome, [5] cardiovascular problems such as pulmonary embolisms, anemia, an incorrectly calibrated medical respirator, [1] [3 ...