Techniques for evaluating urinary stress incontinence
Techniques for detecting stress urinary incontinence use a pressure sensing catheter the electrical indications of which are applied to a processing unit for detecting pressure levels generated during involuntary coughs. The involuntary coughs are induced preferentially by using a nebulized composition of L-tartrate in a pharmaceutically acceptable carrier. The area under the curve generated from pressure samples is calculated and used in conjunction with the detection of urine leakage to determine the existence of stress urinary incontinence.
1. A method for evaluating for stress urinary incontinence, comprising:
inserting a pressure sensing catheter within a patient's bladder, the pressure sensing catheter having a pressure sensor on the surface of the catheter and positioned within the patient's bladder for measuring bladder pressure;
filling the patient's bladder to a predetermined level;
having the patient voluntarily cough to produce a voluntary cough event;
sampling pressure output values from the pressure sensing catheter for the duration of the voluntary cough event corresponding to the intravesical pressure;
calculating the area under the curve (AUC) by integrating the sampled values of intravesical pressure over time;
determining a peak intravesical pressure value for the duration of the voluntary cough event;
determining if there has been an involuntary expulsion of urine during the voluntary cough event;
supplying to the throat of the patient an aerosol containing a chemoirritant agent effective for inducing an involuntary cough event;
sampling pressure output values from the pressure sensing catheter for the duration of the involuntary cough event corresponding to the sampled intravesical pressure;
calculating the area under the curve (AUC) by integrating the intravesical pressure samples over time;
determining a peak intravesical pressure value for the duration of the involuntary cough event; and
determining if there has been an involuntary expulsion of urine during the involuntary cough event;
processing values for the AUC of the voluntary and involuntary cough events, the peak intravesical pressure values for the voluntary and involuntary cough events and correlating to whether there was any involuntary expulsion of urine during the voluntary and involuntary cough events to evaluate the patient for stress urinary incontinence.
2. The method according to claim 1 , and further comprising plotting the measured variations in bladder pressure on a graph and calculating an area under the curve for the graph.
3. The method according to claim 1 , and further comprising inducing the involuntary cough event by administering to the patient a nebulized composition of L-tartrate in a pharmaceutically acceptable carrier.
4. The method according to claim 1 , and further comprising processing within a hand held unit.