Methodological analysis of the article “Cardiorenal syndrome in patients with cardiac failure in a university hospital”

Abstract

We have read with great interest the article: “Cardiorenal syndrome in patients with heart failure in a university hospital”, by Rozo et al., from which we highlight the contribution of the article to the knowledge of cardiorenal syndrome; nevertheless, some details deserve to be analyzed.

With respect to the wording, it is suggested that the objectives mentioned in the abstract have a concordance with the objectives mentioned in the other sections of the article, thus, in the abstract it is mentioned that the frequency of cardiorenal syndrome will be evaluated without specifying the type of cardiorenal syndrome, while in the introduction it does indicate that type II cardiorenal syndrome will be evaluated; however, in the conclusions again it is mentioned only as “cardiorenal syndrome” without specifying the type. Furthermore, in the results section there is an increase of 20 patients in the sample in Table 3, where it mentions 367 patients, contradicting what is mentioned in the materials and methods section, where it is described that the sample size is 347 patients in total, there being a difference of 20 participants. This difference raises doubts about the real sample size used, with the possibility of influencing the results and conclusions.