Help me answer the questions. Today, the continuing strong growth of the market has encouraged MPO Fentres's CEO to rethink the organisational model of its agencies. In order to improve performance and increase the commercial strength of the company, an audit of its business performance was conducted. Internal research within the company enabled the identification of tasks conducted by employees, and the time allocated to each task, over the course a year. The results are as follows. Each year, a salesperson has two weeks of training and five weeks of paid holidays (in accordance with employment law). Two weeks of their annual working time is devoted to attending trade fairs. In addition, the average salesperson is absent one week per year for personal reasons. In terms of the organization of their five-day working week, the Director observed that one day is devoted to purely administrative tasks (making appointments and reporting activities). For the remaining four days of the week, based on a working day of 11 hours, one hour is devoted to the management of administrative problems and urgent tasks, and one hour is taken as a lunch break. In terms of customer contacts, information obtained from sales staff showed that the average sale is concluded at the end of the third meeting, and that such meetings last on average about an hour.

Question 21 How accurate is ultrasonography in detecting renal calculi?

Question 22 Please explain the most effective way to manage a case of intrauterine fetal unilateral hydronephrosis in the 32nd week of pregnancy.

Question 23 In renal failure, why does oedema first occur in the periorbital area and nowhere else?

Question 24 How does sodium valproate decrease serum urea concentration and GI bleed increases it?

Question 25 1. What clinical information can be obtained by checking the blood urea nitrogen (BUN) level that cannot be obtained by checking the blood urea and serum creatinine alone? 2. What is the signifying difference between blood urea and BUN?

Question 26 1. Does uraemia cause dysentery with blood and mucus mixed with the stools? 2. Is it correct to use the term 'uraemic dysentery'? 3. Does uraemia cause finger clubbing?

Question 27 What are the causes of a low serum creatinine?

Question 28 Why does oliguria occur in the early stages of acute tubular necrosis (ATN)?

Question 29 Is renal impairment induced by lithium therapy in bipolar affective disorders irreversible? How often does it occur?

Question 30 Can you please explain why a patient with chronic renal failure (CRF) might present with either oliguria or polyuria?