^aCardiology Department, ASUR 4 Hospital, Senigallia, Italy

^bCardiology Department, Italy

^cHaemodynamic Department, Ospedali Riuniti ‘Umberto I, G.M. Lancisi, G. Salesi’, Ancona, Italy

Received 13 November, 2010

Revised 7 March, 2011

Accepted 7 March, 2011

Correspondence to Dr Anna Patrignani, MD, Cardiology Department, ASUR 4 Hospital, Via Cellini 1, Senigallia 60019, Italy Tel: +39 071 79092534; fax: +39 071 79092568; e-mail: [email protected]