As the expected lifespan and interest in quality of life increase, medical demands by patients increase and become segmented. Because of the westernization of diets and lifestyle, hypertension, diabetes, dyslipidemia, and obesity are increasing with age, and proactive treatment is being performed on aged patients with the development of medical technology [1,2]. Urination disorders and urinary incontinence represented by prostatic hypertrophy and its related lower urinary tract symptoms (LUTS) among old men and urination disorders represented by overactive bladder in old women are increasing remarkably, and it has been reported that these disorders are closely related to chronic diseases such as hypertension, diabetes, and metabolic syndrome [3-5]. In other words, many patients have various kinds of other diseases as well as urologic problems, and there are many patients in departments other than urology who complain of various urologic problems such as urinary retention. According to data from the Health Insurance Review & Assessment Service in 2012, there are 2 tertiary hospitals, 19 secondary hospitals, 69 primary hospitals, and 29 nursing hospitals in Gwangju. The number of urologists in those institutions are 9 in tertiary hospitals, 13 in secondary hospitals, 1 in primary hospitals, and 0 in nursing hospitals. If tertiary hospitals are excluded, 14 urologists are managing inpatients referred by doctors in other departments [6]. In particular, patients in nursing hospitals in this area may have difficulties in urologic treatment and management because of the absence of urologists, although these hospitals are presumed to have many patients with urologic problems considering the characteristics of the inpatients [7]. Accordingly, we aimed to determine the necessity of professional treatment and the role of urologists in treating inpatients by analyzing the cooperative behavior patients referred to the department of urology.

The sex, age, referring department, and disease group of the inpatients referred to the department of urology from January 1, 2009, to December 31, 2011, were extracted from the patients' medical records regardless of current or past medical history of urologic disease. The patients were divided into 10 subgroups by age and into disease groups as follows: urination disorder, infection, tumor, calculus, trauma, pediatrics, andrology, and others. The urination disorder group included neurogenic bladder, benign prostatic hypertrophy, urinary retention, urinary incontinence, and overactive bladder. The neurogenic bladder patients included patients with suspected neurogenic bladder, those with congenital or acquired disease that could induce neurogenic disorder, those with a past medical history of pelvic surgery such as radical hysterectomy or radical colectomy, and those who were diagnosed as having neurogenic bladder. Patients with urinary retention were defined as those who had difficulties in self-voiding despite enough volume of urine in the bladder or who had considerable remaining urine in the bladder in the residual urine test. Overactive bladder patients who complained of urge urinary incontinence were placed in the urinary incontinence group. For infection, not only pyuria simplex but also prostatitis was included. For tumor, not only the patients with confirmed urogenital tract tumors but also cases acquiring hematuria and those with an abnormal prostate-specific antigen level were included. In the pediatric group, all patients under 10 years of age regardless of disease were classified as pediatrics. The "others" group included cystoscope test commission to identify the pathogenesis of other departmental carcinomas, installation and removal of ureteral stents, and inquiries for urologic radiology tests.

Because of westernized diets and changes in lifestyle, chronic diseases such as diabetes and hypertension have increased, and there are reports that various diseases in internal medicine are related to urologic diseases. Thus, many patients with urologic problems have problems that are addressed in other departments as well. Considering the characteristics of the inpatients, many patients with chronic diseases show acute aggravation of the chronic disease or complications because of the aggravation. Such a trend is more conspicuous among aged patients, and more medication administration and operational treatments are being administered among inpatients. It is possible that there is a more obvious tendency toward these features of the inpatients in upper-scale general hospitals.

In this study, concerning the sex and age distribution of the patients, there were more male patients than female among cooperative behavior referrals and there were more patients older than 60 years of age than other age groups. The United Nations has defined a society with an aged population of 7 to 14% as an aging society, a society with an aged population of 14 to 20% as an aged society, and a society with an aged population of more than 20% as an ultra-aged society [8]. According to the Statistics Office, Korea has already entered into an aging society, with 9.1% of the population aged over 65, and it is expected to enter into an aged society in 2018 and an ultra-aged society in 2026 [9]. According to Lee et al. [10] regarding the prevalence of overactive bladder, urinary incontinence, and LUTS, more males over the age of 50 show LUTS than females and the occurrence of LUTS in males increases with age. Such LUTS in males are caused by benign prostatic hypertrophy, which is prevalent in aged males. It is known that 40 to 70% of males over 60 have benign prostatic hypertrophy symptoms in Western reports [11,12]. The prevalence of benign prostatic hyperplasia increases from approximately 50% at 60 years of age to 90% in men older than 85 years [13].

Looking into the departmental distribution, it was in the descending order of internal medicine, orthopedic surgery, neurosurgery, general surgery, obstetrics and gynecology, and neurology. Of these departments, the internal medicine department recorded 34% of referrals in the 3 years studied. The most common chronic diseases that the patients in internal medicine have are diabetes and hypertension. In particular, metabolic syndrome is defined when diseases such as hypertension, diabetes, dyslipidemia, and obesity causing coronary artery disease are shown together [14]. It is known that the basic pathophysiology of metabolic syndrome may cause LUTS because of secondary hyperinsulinemia owing to insulin resistance and overactivation of the sympathetic system [15], and abdominal fat is related to prostatic hypertrophy [16]. Additionally, urinary symptoms in the patients with obesity and diabetes may be aggravated because of more frequent urinary tract infections owing to decreased immunity. Obesity and diabetes may cause LUTS and erectile malfunction because of the dysfunction of vascular endothelial cells [17,18]. Additionally, because of the aggravated base diseases in internal medicine, LUTS can occur because of dementia or delirium. Furthermore, various medications, such as hypertension-preventive calcium channel blockers, nasal decongestant α-adrenergic agonists, diuretic and nonsteroidal anti-inflammatory drugs for congestive heart failure, angiotensin converting enzyme inhibitors, and anticholinergics, can cause LUTS [19].

In departments where operations for nongenitourinary diseases take place, such as orthopedic surgery, neurosurgery, general surgery, and obstetrics and gynecology, urination disorders are reported in 4 to 25% of cases after an operation using general anesthesia or spinal anesthesia [20]. According to the type of operation, the occurrence of voiding dysfunction after the operation was 26% in laparotomy, 14% in herniotomy, 30% in laparocholecystotomy [21-23], and 28% in total hip reconstruction and total knee reconstruction [24]. In this study, compared with the other surgery departments, the rate of referrals was high in orthopedic surgery. This may be because there were more inpatients in orthopedic surgery than in other departments and that disorders in walking were caused after the operations.

When looking into the distribution by disease, urination disorder was the highest, with a rate of 61.26%. Among urination disorder diseases, they were in the descending order of benign prostatic hypertrophy, neurogenic bladder, urinary retention, urinary incontinence, and overactive bladder. Urinary retention may easily occur in older populations because they have retarded renal function, thus concentrating the urine; reduced contraction power of the bladder; difficulties in mobility because of failed joints; changes in cognitive processes; lost integrity of the nervous system; and obstruction disease such as benign prostatic hypertrophy and uterus or bladder prolapse [25]. Additionally, with the lengthened hours of the operation, the amount of anesthetic and narcotic analgesic administered to the patient increases and the hydration solution amount also increases. Therefore, urinary retention may occur more easily [21]. This mainly happens in perineum, gynecology, and anal surgery. Urinary retention occurring after surgery may be temporary. However, urinary retention can be related to inappropriate management or lack of management of urologic problems. Additional agents used after the operation can also cause problems in urination; therefore, these patients need continuous referral to urology.

In the urinary incontinence prevalence survey of the general public in Korea, the overall prevalence rate was 41.2% [26] and the rate of urinary incontinence in this study was 9.85%. According to Shin et al. [7] study regarding the prevalence rate and management status of urinary incontinence among the inpatients of nursing hospitals in Busan, the reasons for admittance to a nursing hospital included cerebral vascular disease (33.8%), senile infirmity (20.3%), dementia (16.4%), immobilization (10.3%), chronic wasting disease (9.8%), and other diseases including Parkinson's disease (9.4%). The prevalence rate of urinary incontinence was 48.1%, and most of the patients managed urinary incontinence by use of diapers. Complications were reported as cutaneous disorders in the inguinal region and perineum, eczema, and decubitus.

It is generally thought that uncomplicated urinary tract infections can occur easily and are harmless because they can be cured with the administration of antibiotics. However, in the case of complicated urinary tract infections, ranging from cystitis to sepsis accompanying shock, the strain would be most frequently enterobacteria such as Escherichia coli. Compared with uncomplicated urinary tract infections, the causative strains of complicated urinary tract infections are much more various with high antibiotic resistance [27]. According to the clinical guidance of the European Urology Association, factors suggesting complicated urinary tract infections are male sex, elderly age, hospital-acquired infection, pregnancy, indwelling urinary catheter, diabetes mellitus, immunosuppression, and recent antimicrobial use [28]. Patients in the hospital frequently show fragile physiques with a high level of accompanying diseases; thus, the occurrence of infections would have more serious results. Accordingly, it is important to prevent urinary tract infections in patients in the hospital and to treat such infections early. Indiscreet use of catheters, one of the most important causes, and unnecessary long-time custody should be avoided. Also, in the case of elderly patients with diseases that may cause dysuria, such as neurogenic bladder and benign prostatic hypertrophy, the occurrence of urinary tract infections may be increased; thus, management with regard to such infections should be given due consideration.

In this study, there were 69 primary hospitals in Gwangju, only one of which had a department of urology, although most of them had internal medicine, orthopedic surgery, neurosurgery, and general surgery. When we examined the collaborative practice cases referred to the department of urology in Chosun University Hospital, we found that most of the referrals were made by internal medicine, orthopedic surgery, neurosurgery, and general surgery, and the most frequent disease was urination disorder. It is possible that the urination disorder, urinary tract infection, and erectile dysfunction that are frequent complaints of inpatients, and the urination disorder after operations for non-genitourinary diseases, could be prevented with the interest and attention of the doctors in other departments and that these disorders are not treated in their early stages because of the absence of a urologist. As the society ages, more and more people use medical services such as nursing hospitals, but urination disorder and its complications are not properly treated because of the absence of urologists. Efforts should be made to improve the quality of life of the patients by administrating proper methods and education.

In this analysis of the cooperative behavior in our hospital over a 3-year period, older patients over the age of 60 with urination disorder occupied a high percentage of the cooperative behavior cases. In the future when Korea becomes an aged society, it is expected that urination disorder-related diseases in advanced age will increase and doctors in other departments should be aware that the professional treatment and management of these disorders by a urologist is needed.