Microcirculation is a rather new field which has been of predominant interest to basic scientists, linking togeth r technical, hemodynamic, and biochemical aspects. The fmdings elaborated, however, are not only of theoretical interest, but bear in addition great clinical implications. In clinical cardiology this became quite evident by the use of tracers in order to study myocardial perfuSion and by the deSCription of certain clinical entities - such as angina with normal coro nary arteries - which are best explained by "disturbed microcirculation." With respect to this new developing...