Easy Volumeter in Detection of Breast Cancer-Related Lymphedema: A Validity Study
Onur Engin, MD,1 Elif Akalın, MD,2 Efe Sarıbay, MS,3 Ceren Aslan, MD,2 Ebru S xahin, MD,2 and Serap Alper, MD2. Lymphatic Research Biology, February 2019
Aim and Hypothesis: The standard volumeter is heavy and fragile, and using the same volumeter for different patients can result in hygiene problems. These disadvantages point to the need for the development of a new model of volumeter. The new volumeter put forward in this study is lighter, smaller, sturdier, and easier to clean, while also having its own scale. In this study, the validity of this newly designed volumeter is investigated.
Materials and Methods: In the ﬁrst step, the volume of standard cylinders was measured thrice using a standard volumeter and an easy-measurement volumeter, after which a total of 30 arm volumes of 15 volunteers were measured. In the ﬁnal stage, the arms of 28 patients with breast cancer-related lymphedema were measured once with both volumeters and the mean results were compared.
Results: There was a high degree of consistency between the measured volumes of cylinders of known volume when measured with a standard volumeter and the ‘‘Easy volumeter.’’ The measured mean volumes with the two volumeters were assessed with paired sample t-test, resulting in a signiﬁcance (p-value) of 0.927, indicating no difference between the measurements of the two volumeters. The variance of measurement of the devices was assessed with a Levene’s test, and the signiﬁcance (p-value) was obtained as 0.981. Based on this result, the null hypothesis cannot be rejected, meaning that there is no difference in the variances of measurements of the two volumeters. Likewise, a paired sample t-test was used to evaluate the differences between the mean measurements of the healthy volunteer’s group, and no difference was detected between the mean arm volumes measured with each volumeter (signiﬁcance=0.105). The measurements between the two volumeters were also consistent in the lymphedema patient group (involved arm signiﬁcance=0.842 and normal arm signiﬁcance=0.075).
Conclusion: Our study revealed the validity of the newly designed ‘‘Easy Volumeter’’ for the measurement of arm volumes, indicating its appropriateness for use in daily practice