[Correlation between the leak point pressure and the clinical grade of incontinence].

We evaluated one-hundred and forty-six women with stress urinary incontinence (SUI), mean age 61.5 years, with clinical examination, urodynamics and patient history, grading the subjective degree of SUI according to SEAPI QMM classification. SUI was grade 1 in 73 pts (mean LPP 107, 7 cmH2O, mean maximal urethral closure pressure 59, 13 cmH2O), grade 2 in 36 (mLPP 55, 4 cmH2O, mMUCP 50, 3 cmH2O), grade 3 in 37 (mLPP 32, 29 cmH2O, mMUCP 33, 76 cmH2O). There is statistically significant difference in mLPP (p = 0.001) and mMUCP (p = 0.02) among three groups. The grade of SUI increases as the likelihood that LPP will be < or = 90 cmH2O or < or = 60 cmH2O (72.2% of pts with grade 2 has a LPP < or = 60 cmH2O, 100% of pts with grade 3 has a LPP < or = 60 cmH2O). Women with severe leakage and/or predisposing factor (PF) to intrinsic sphincter deficiency are likely to have a low LPP: all patients with SUI grade 3 and PF have a LPP < or = 60 cmH2O, 77% of pts with SUI grade 3 or PF has a LPP < or = 60 cmH2O. Women with higher grades of leakage and PF are significantly more likely to have a very low LPP and intrinsic sphincter deficiency.