Nevertheless, the slightly non-significant tendency for greater sodium fractional and total excretion prior to the loop-diuretic dose was observed (8.4 ± 4.6 vs. 2.8 ± 0.5 mmol/h; p = 0.26) in supine patients was observed.
Additionally, although the difference did not reach statistical significance, total sodium excretion tended to be higher before loop diuretic administration in patients assigned to the supine group, but spot urine sodium concentration remained highly similar.
Likewise, no significant differences in renin secretion were observed; however, upright patients showed a trend toward higher renin levels than those in the supine position.