A nurse is reinforcing teaching with a client who is at risk for hypokalemia. The nurse should instruct the client that which of the following foods is the best source of potassium?

Choice A reason: A heart murmur is a common finding in clients who have mitral valve stenosis. It is a sound produced by turbulent blood flow through the narrowed valve. The murmur is usually heard as a low-pitched rumbling sound during diastole.

Choice B reason: Bradycardia is not a typical finding in clients who have mitral valve stenosis. Bradycardia is a slow heart rate, usually below 60 beats per minute. Mitral valve stenosis can cause tachycardia, which is a fast heart rate, due to increased cardiac workload and reduced cardiac output.

Choice C reason: Clubbing of the fingers is not a sign of mitral valve stenosis. Clubbing is a deformity of the fingertips and nails that occurs due to chronic hypoxia. Mitral valve stenosis can cause pulmonary hypertension and pulmonary edema, which can impair gas exchange, but not to the extent of causing clubbing.

Choice D reason: Barrel chest is not a sign of mitral valve stenosis. Barrel chest is a condition where the chest is enlarged and rounded due to chronic lung disease. Mitral valve stenosis can affect the lungs by increasing the pressure in the pulmonary circulation, but it does not cause structural changes in the chest wall.

Choice A reason: Collecting urine from the catheter's port is not a correct action for the nurse to take, as it can introduce contamination and infection into the urinary tract. The nurse should insert a new, sterile catheter into the bladder and collect the urine directly from the catheter.

Choice B reason: Using a sterile specimen container is a correct action for the nurse to take, as it ensures that the urine sample is not contaminated by any bacteria or other substances. The nurse should label the container with the client's name, date, and time of collection and send it to the laboratory as soon as possible.

Choice C reason: Using sterile water to inflate the balloon is not a relevant action for the nurse to take, as it applies to an indwelling catheter, not a straight catheter. A straight catheter does not have a balloon and is removed after the urine is drained.

Choice D reason: Instructing the client to clean from front to back with an antiseptic solution is a good action for the nurse to take, as it helps to prevent the introduction of bacteria from the anal area into the urethra. However, it is not the best answer, as it is a general hygiene measure, not a specific action for obtaining a urine specimen.