Preliminary results of indoor radon survey in V4 countries.

The measurements of radon activity concentration carried out in residential houses of V4 countries (Hungary, Poland and Slovakia) show that radon levels in these countries considerably exceed the world average. Therefore, the new radon data and statistical analysis are required from these four countries. Each partner chose a region in their own country, where radon concentration in residential buildings was expected to be higher. The results of the survey carried out in the period from March 2012 to May 2012 show that radon concentrations are <200 Bq m(-3) in ∼87% of cases. However, dwellings with radon concentration ∼800 Bq m(-3) were found in Poland and Slovakia. It was also found that the distribution of radon frequency follows that of houses according to the year of their construction.

The association of carotid artery stenosis with carotid sinus hypersensitivity. Transitory cerebral ischaemic attack provoked by carotid sinus reflex.

The association of internal carotid stenosis with the carotid sinus syndrome represents a special clinical entity. Transitory cerebral ischaemic attack (TIA) will usually be manifested by activation of carotid sinus reflex. Eighteen patients were observed suffering from both carotid sinus hypersensitivity and TIA. The patients had had TIA's for many years. Unilateral internal carotid stenosis was detected in 15 cases, while 3 patients had bilateral carotid stenosis. On carotid sinus stimulation, syncope appeared and a TIA could be provoked. The mean duration of the syncopic attack was 5500 ms and was based on sinus arrest in 14 cases and on third degree AV block in 4 cases. In all patients carotid artery disobliteration was performed; in 14 patients pacemaker implantation was necessary, while 4 patients could be treated by atropine medication. The development of a TIA could be abolished in every patient and 14 patients remained totally symptom free.