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Reduced oxygen saturation levels (but above 92%) are often encountered. Examination of the lungs with a stethoscope may reveal reduced air entry and/or widespread wheeze. [6] The peak expiratory flow can be measured at the bedside; in acute severe asthma, the flow is less than 50% of a person's normal or predicted flow. [6]
An asthma attack may include wheezing, shortness of breath, coughing, chest tightness and trouble sleeping. Not every asthma sufferer experiences all of these symptoms. Asthma Triggers
Normal arterial blood oxygen saturation levels in humans are 96–100 percent. [1] If the level is below 90 percent, it is considered low and called hypoxemia . [ 2 ] Arterial blood oxygen levels below 80 percent may compromise organ function, such as the brain and heart, and should be promptly addressed.
Cardiac asthma is the medical condition of intermittent wheezing, coughing, and shortness of breath that is associated with underlying congestive heart failure (CHF). [1] Symptoms of cardiac asthma are related to the heart's inability to effectively and efficiently pump blood in a CHF patient. [ 2 ]
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One study found that only 33% of people presenting to an emergency department with an oxygen saturation below 90% had an increased respiratory rate. [14] An evaluation of respiratory rate for the differentiation of the severity of illness in babies under 6 months found it not to be very useful.
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