Once you are diagnosed with asthma, create an asthma action plan with your allergist or physician. This plan is basically a step-by-step process of what to do when you face an acute attack. The plan should be written down and include emergency phone numbers as well as those of family and friends who can meet you at the hospital if needed.  When you get the diagnosis, consult with your doctor to identify your particular symptoms of worsening asthma and what you should do when they flare up (e.g. take medication, go to the emergency room, etc).  Make sure you know how to use your rescue inhalers. Write this plan down and keep it with you at all times. In general, note that prevention of symptoms is the best way to manage and treat asthma. If you know what situations trigger your asthma attacks (such as being around furry animals or extremely hot or cold weather), then try to avoid these when possible. There are two different type of rescue medications that you may have been prescribed your doctor, a Metered Dose Inhaler (MDI) or a Dry Powder Inhaler (DPI).  MDIs the are most common inhalers. They deliver asthma medication through a small aerosol canister equipped with a chemical propellant that pushes the medication into the lungs. An MDI can be used alone or with a breathing chamber ("spacer") that separates your mouth from the inhaler, and which can allow you to breathe normally to receive the medication and help the medication get into the lungs more efficiently. A DPI inhaler means of delivering dry powder asthma rescue medication without propellant. Brand names of DPI medications include Flovent, Serevent, or Advair. A DPI requires you to breathe in quickly and deeply, which makes them difficult to use during an asthma attack. This makes them less popular than the standard MDIs. Whichever you have been prescribed, make sure you are always carrying it with you. Note that when suffering an asthma attack, you only want to use an MDI filled with the rescue medication, bronchodilators (such as albuterol) , and...

===
Write a summary of the previous text in Vietnamese:
Có kế hoạch ứng phó tại chỗ. Tránh các tác nhân kích thích. Mua ống hít do bác sĩ kê toa. Sử dụng MDI. Sử dụng DPI. Nhận biết cơn hen cần cấp cứu. Nghỉ ngơi trong khi chờ nhân viên cấp cứu đến.