Table 1.

Comparison of Urodynamic Parameters in Obstructed and Unobstructed Patients Using Videourodynamic Criteria^*

Urodynamic Parameter	Obstructed Patients (n = 76)	Unobstructed Patients (n = 185)	P
Qmax mL/s	9.0 ± 6.2	20.1 ± 10.0	< .001
Pdet @ Qmax cm H20	42.8 ± 22.8	22.1 ± 11.3	< .001
Postvoid residual (mL)	157 ± 183	33 ± 91	< .001
Bladder capacity (mL)	381 ± 170	347 ± 147	.11
Detrusor instability	45%	41%	.62

Q_max, maximum flow rate; P_det @ Q_max, detrusor pressure at maximim flow rate.

^*Defined by Nitti, et al.⁴⁰