Dear Anne Laure:
The first doctors who started giving IVIG to SCLS patients were French, and they did so as long as 15 years ago, although the treatment became more routine in France only about a half-dozen years ago.
The experience was that most patients stopped having episodes, although not always immediately, and in some cases patients experienced one or two additional episodes of lesser severity after being on IVIG for many months.
We have in our community one of those patients, claude53, with whom you already have communicated. He has been on IVIG since 2005.
The good news about IVIG started to spread out of France in 2008, and then the therapy began to be tried in patients all over Europe, in North America, and elsewhere around the world. Nowadays all SCLS patients who were having confirmed episodes -- especially frequently, as in your case -- are all getting IVIG and virtually all are reporting no more episodes. We have more than 30 patients in this community (including me) who have been receiving IVIG during the last 3-4 years and have been able to resume normal lives.
Several medical articles describing the effectiveness of IVIG for patients with SCLS are listed in the section Disorder Resources, the most comprehensive of which appeared in April 2011, reporting the results obtained by a team of doctors under Zahir Amoura of the Département de Médecine Interne, Hôpital de la Pitié-Salpêtrière, Paris. The various articles published since that time are all reporting excellent results, but we know that, as is the case with all medicines, IVIG is not 100% effective.
Indeed, we also have in our community a couple of patients who have had confirmed episodes of SCLS despite being on IVIG, and one of them, from France -- one of Dr. Amoura's patients, actually -- died in February of 2012 from episode-related complications despite being on IVIG for several years. To my knowledge, however, no patients have volunteered to stop receiving IVIG.
We also have some patients on IVIG in our community who have reported having some symptoms -- not necessarily of an episode of SCLS, sometimes the symptoms are reactions to the IVIG itself -- before the usual 4-week infusion cycle is over. I recommend you read the Discussion Forum titled "4th Week Symptoms" for a discussion of such issues and how doctors and patients are dealing with them, by adjusting the timing and dosage of the IVIG.
In conclusion, IF you have been properly diagnosed as having SCLS, and IF you are experiencing frequent episodes of SCLS which are confirmed by laboratory or HemoCue evidence -- because there are other swelling-related illnesses -- then your doctors should be putting you on an IVIG therapy in order to stop all such episodes. Any and all confirmed capillary leaks can cause, and usually do cause, detected or undetected damage to your organs and the inside of your arms and legs -- and any of them can cripple or kill you.