Non-diagnosis decisions and non-treatment decisions in elderly patients with cardiovascular diseases, do they differ?--A systematic review

The growth in the number of possible medical interventions in the past decennia necessitates physicians to consider whether to use them. Contrary to decisions to withhold treatment, little is known about "non-diagnosis decisions" (NDD) although their consequences seem to be more uncertain. Hence, we hypothesized that "determinants" and "reasons" for NDD are different from those that are associated with non-treatment decisions (NTD). We performed a systematic review on research on physicians' decisions to withhold or withdraw diagnostic or therapeutic interventions. A total of 11,773 unique citations published either in Medline, Embase, or the Cochrane databases were screened, of which 45 articles,--including 4 articles describing NDD in elderly patients suspected of cardiovascular diseases, were considered relevant and analysed in detail. "Determinants" and "reasons" for NDD and NTD were extracted, categorized into predefined categories, and compared with each other. Besides several similarities, we found various differences between NDD and NTD. The proportionality of an intervention (ie, the risk or burden of an intervention opposed to that of no intervention) was associated with NTD but not with NDD. Physician and care institution related characteristics, such as age of the physician or the employment of physician extenders, were more frequently associated with NDD than with NTD. Furthermore, the presence of non-resuscitate directives was correlated with NDD but not with NTD. This systematic review shows that there is little information on NDD in the current literature. Yet, there is not enough evidence to conclude whether NDD can be seen as a separate entity distinct from NTD. More research focusing on NDD seems needed.