“…So, it is better to consider the safe limit up to 18 cm. 3,4,10 Lee et al have a prospective study comparing the incidence of cardiac arrhythmias with three different lengths of guidewire insertion (15, 17.5, and 20 cm) during right IJV catheter insertion. Cardiac arrhythmia was reported in 26%, 35%, and 65% with 15, 17.5, and 20 cm respectively.…”