Scanning more corresponds to more accuracy in hemodialysis patients: 28-zone protocol's superior findings from an observational study.

Aims: Hypervolemia remains a problem in hemodialysis patients and is associated with hypertension, cardiovascular events and mortality. Lung Ultrasound (LUS) is a technique that detects hypervolemia via 4 different protocols depending on the number of sites checked on the chest wall. It has not been established which protocol should be preferred in the literature.

Methods: This study included 68 hemodialysis patients from one Dialysis Unit. All the patients underwent LUS with every single protocol 30 min before and after the end of the middle-week dialysis session by a nephrology trainee. Patients' ideal weight was modified based on daily clinical practice rather than ultrasound findings.

Results: Seventeen patients (25%) had ultrasound findings compatible with hypervolemia before the dialysis session, while eleven patients (16.2%) had still pulmonary congestion after the end of the session. These findings were similar to the number of patients considered hyperhydrated based on clinical criteria (10 patients). The rest protocols (8-zone, 6-zone and 4-zone protocol) considered fewer patients as hypervolemic.

Conclusions: The 28-zone protocol can effectively detect hypervolemia and even classify the degree of it, although It is a time-consuming method. However, the other protocols can detect the hypervolemia in hemodialysis patients only when severe lung congestion exists. Their usefulness is limited in daily clinical practice in hemodialysis patients. More studies should be carried out for further and more reliable conclusions.