[Cardiomyopathy in Italy today: extent of the problem].

Since the number of patients suffering from cardiomyopathy in Italy is unknown at present, a multicentre survey was carried out in 15 University and Hospital cardiological centres. Each centre was asked to report the number of cases of dilated, hypertrophic or restrictive cardiomyopathy observed between 1970 and 1987. Information was also sought regarding the residence of the patient at the time of diagnosis. Diagnostic criteria for each type of cardiomyopathy, based on those published in the current literature, were sent to the participating centres. For the entire period, a total of 2,229 patients with dilated, 913 with hypertrophic, and 64 with restrictive cardiomyopathy were reported. The number of cases observed between 1980-87 was about four times greater than that observed between 1970-79 for dilated cardiomyopathy and three times greater for hypertrophic cardiomyopathy. In the period 1970-79, a minimal annual incidence of dilated cardiomyopathies was calculated. In the centres this ranged from 0.005 to 1.8 per 100,000 inhabitants, although no systematic evaluation was made. On the contrary, minimal prevalence for hypertrophic cardiomyopathy ranged from 0.4 to 5.6 between 1970-79. These rates increased to 0.09-3.4 for dilated cardiomyopathy and to 1.0-23.0 for hypertrophic cardiomyopathy in the period 1980-87. On the basis of this survey the number of patients with a diagnosis of dilated and hypertrophic cardiomyopathy seems to be on the increase in our country. This increase may be due to the diagnostic facilities available, such as echocardiography, and possibly to a better knowledge and a greater interest in cardiomyopathies.(ABSTRACT TRUNCATED AT 250 WORDS)