Welcome to our SCLS virtual community, Cristina!
We are very sorry to hear about your traumatic first episode, but it's great to hear that you survived it with your organs intact and got a diagnosis so quickly! Most of us were by no means as lucky.
In these many pages you will find out just about everything that is known about SCLS, and compared to the state of knowledge that prevailed just 5 years ago, believe me, we have come very far, very quickly.
I'll just answer one of your questions to begin with, about the different experiences with episodes of capillary leaks. We believe that the severity of the episodes has to do with 3 things: (1) how much plasma the capillaries leak (measured indirectly by how concentrated your blood's hemoglobin, or Hgb, becomes) and for how long they leak; (2) to what extent your organs (and particularly your brain and heart) are capable of functioning despite the drop in oxygen delivery that takes place during an episode; and (3) the dosage and type of medications taken before and during an episode.
For example, I had episodes when my Hgb rose from 16 to 19 gr/dL and then subsided, and others where it rose to 21 or even 23 gr/dL before trending down. (The normal range for an adult is somewhere between 13 and 17.) Initially, even the former episodes would land me in the hospital, because I would lose consciousness -- my brain couldn’t function properly. After a time, however, my organs seemed to get used to the episodes, and I wouldn’t pass out unless I had one of the latter, severe leak episodes.
We also know that some medications can help to abort or minimize an episode, such as steroids (e.g., prednisone taken orally if an episode is just getting started, otherwise methylprednisolone administered intravenously) or albumin. However, it’s not advisable to take steroids every day to prevent episodes, because their long-term side effects can be worse than the consequences of the episodes themselves.
Episode prevention is best accomplished by means of monthly infusions of IVIG (intravenous immunoglobulin), but some patients seem to be helped by a far cheaper and less invasive set of medications called beta agonists, such as theophylline and terbutaline (T & T) – though they have nasty side effects, including irritability, insomnia and fast or irregular heart beats. Since nobody has conducted blind, randomized trials with either medication – and probably never will – we don’t know for sure how or when these medications are effective. In general, most patients are given T & T to begin with, but if they keep having episodes anyway, they are (increasingly quickly) being transitioned to IVIG.
And then there are a few lucky patients that go for many years without having an episode even though they are taking no medications at all. We can't explain that as of yet.