![]() It can be used to diagnose asthma as well as COPD and other respiratory conditions. It involves you breathing into a tube that is connected to a machine, which gives your doctor measurements of your breathing. Your doctor may also recommend a spirometry test,⁴ which measures how much air you can inhale and exhale and also how quickly you can release air from your lungs. Your doctor can explain how to use a peak flow test to measure your breathing at home if they recommend using it regularly at home. A peak flow test can be done in the doctor’s office as diagnosis criteria, and you can also have a peak flow meter to use at home to check your lung function throughout the day. If your peak flow score is lower than normal, it may indicate that your airways are narrowed or that your lung function is not where it should be. Here are the two most common diagnostic tests: Peak flowĪ peak flow test³ involves breathing forcefully into a tube to determine how much air you can breathe out and how quickly you can breathe it out. There are various ways that doctors test your lung function and come to a diagnosis of asthma. Knowing this, you can make positive lifestyle changes to prevent the development of nocturnal asthma or lessen your symptoms if you already have it. It simply means that you have a higher chance of suffering from the condition. ![]() If you have any of the above risk factors, that doesn’t necessarily mean that you will develop nocturnal asthma. Smoking or being exposed to cigarette smoke secondhand Either way, there are some risk factors that can increase your risk of developing nocturnal asthma, such as: Perhaps the cause of nocturnal asthma is one of the above possible explanations, or maybe it’s a mix of all three. Some people may experience increased asthma symptoms at night, too, due to dust mites, allergens, and other triggers. Still another explanation is that you go through hormonal changes while you sleep, which could impact your airways. One explanation² for nocturnal asthma is that a lying position, especially on your side or front, may restrict the airways more than sitting or standing, while another is that lung function changes during sleep. We conclude that patients with nocturnal asthma need their treatment focused on the nocturnal portion of the circadian cycle and that higher STC during this critical time period are beneficial without interfering with sleep quality.Although the exact cause of worsened asthma symptoms during sleep for some individuals is not yet understood, there are some possible explanations that may contribute to the presence of symptoms at night. ![]() All polysomnographic variables were similar between the two preparations, except that with the once-daily preparation there was a decreased number of hypopneas (p less than 0.05) and fewer minutes below an oxygen saturation of 90% (p less than 0.05). ![]() During the night, the STC were significantly higher with the once-daily regimen, and the awakening FEV1 value was also improved (p less than 0.05). In 16 subjects with nocturnal asthma, the STC were significantly higher during the daytime on twice-daily versus once-daily theophylline preparations given at 7 P.M., but the FEV1 values were similar. Two different sustained-release theophylline preparations were used to determine (1) if the serum theophylline concentrations (STC) depend on the type and dosing schedule of the preparation, (2) the relationship between STC and the circadian variations in asthma, and (3) the effect of STC on sleep quality and respiratory patterns during the night. The nocturnal worsening of asthma is a common problem that can be difficult to treat. ![]()
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