[Urodynamics fundamentals. The flow curve and the isometric phase].
OBJECTIVE
To analyze the cause-effect relationship of bladder dynamics and flow rate.


METHODS
A theoretical study was performed using the mathematical equations obtained by other authors.


RESULTS
We have developed equations for bladder dynamics, flow rate and the detrusor, which is considered to act like a spring from experimental studies on anesthesized animals.


CONCLUSIONS
The relaxation constant, urinary stream velocity and area of urethral section can now be determined from the flow rate equation.
Benítez Navío
J A
JA
Servicio de Urología, Complejo Hospitalario de Ciudad Real, España.
Caballero Gómez
P F
PF
D006801:Humans; D008954:Models, Biological; D014521:Urethra / Q000502:physiology; D001743:Urinary Bladder / Q000502:physiology*; D014556:Urine; D014563:Urodynamics / Q000502:physiology*