Previously, when I was still in activity, I moved, in Europe and other parts of the world except in Asia and Oceania, by plane or train and I agree entirely with Arturo when he indicates that it is the recycled air which seems to be a release element of SCLS, I will add associated with a rise in ambient heat in a closed universe, what was also been confirmed to me by my doctors and put a term at my professional career.
This is so true that before being hospitalized in distress following a first collapse in April 1988, it had even become impossible to me to make purchases, going to the restaurant, to attend spectacles, concerts, conferences or theatre, in short everywhere where the buildings are air-conditioned and sometimes combined with powerful lightings and the ambient noise, without after a certain amount of time a crisis of edema starting, very often begin with a very strong feeling from general faintness, smothering, swelling of all the body but especially of the ventre and strong muscular pains, followed vomiting and intense headaches, obliging me to leave immediately to the free air, to refresh me the face, the neck and the high part of the chest using ice cubes and to take 2 capsules of DAFALGAN - Paracetamol (500 Mg) with coffee (not of pure water because ineffective), in order to stop the crisis, the catch of this analgesics and antipyretic allowing seems to avoid the oscillations of pain or fever, and to then lengthen me in a fresh and calm place, under if possible medical monitoring in order to be immediately transported in a hospital if the general state had suddenly worsened, not to manage in this case: salicylated (injection or perfusion) and calcic inhibitors what allowed my survival at the time of this first hospitalization.
Nevertheless the use of the DAFALGAN ® - Paracetamol (Bristol-Myers Squibb Laboratory) is to be handled with precaution because among the counter-indications: Over-sensitiveness with Paracetamol or the other components and the undesirable effects: some rare cases of reactions anaphylactic over-sensitiveness with type of shock, edema of Quincke, cutaneous erythema, urticaria, rash were reported. And to always respect a 4 hours interval between the catches (maximum amount not to exceed 4 g/jour on council of your doctor). Caution in case of grave disease of the liver and by severe impaired renal function (clearance of creatinin lower than 10 ml/min) for which the interval between two catches will be at least 8 hours.
I will hope to be helpful !