Free CCHT Clinical Test 1 — Questions and Answers
Question 1: If a dialysis patient is very large in both stature and weight, which of the following is most likely to improve the effectiveness of hemodialysis?
- Increase salt restriction.
- Decrease treatment time.
- Increase dialyzer size. (Correct answer)
- Change to peritoneal dialysis.
Correct answer: Increase dialyzer size.
For very large patients, increasing the dialyzer size (surface area) is crucial to improve the effectiveness of hemodialysis. A larger dialyzer allows for greater solute clearance and ultrafiltration, which is necessary to adequately remove waste products and excess fluid from a larger body mass. Decreasing treatment time or increasing salt restriction would not directly address the need for more efficient clearance for a larger patient.
Question 2: When creating a buttonhole tract, how many consecutive cannulations are usually required before the tract is adequately formed?
- 4 to 5
- 5 to 8
- 8 to 10 (Correct answer)
- 10 to 12
Correct answer: 8 to 10
When establishing a buttonhole cannulation tract, it typically requires 8 to 10 consecutive cannulations using the exact same angle and depth. This consistent technique helps to create a stable, well-formed tunnel or tract, which makes future cannulations easier, less painful, and potentially reduces the risk of complications like infiltrations or infections.
Question 3: With uremia, as waste products build up in the blood, this can result in _____________.
- ringing in the ears
- rash
- abdominal pain
- ammonia breath (Correct answer)
Correct answer: ammonia breath
Uremia is a condition where waste products, particularly urea, build up in the blood due to kidney failure. One characteristic symptom of severe uremia is ammonia breath, also known as uremic fetor. This distinctive odor results from the breakdown of urea into ammonia in the saliva, indicating a significant accumulation of toxins in the body.
Question 4: Patients receiving hemodialysis should be advised to avoid salt substitutes because the substitutes often _________.
- taste bad
- cause constipation
- cause nausea
- contain potassium (Correct answer)
Correct answer: contain potassium
Many salt substitutes replace sodium chloride with potassium chloride to reduce sodium intake. For dialysis patients, whose kidneys cannot effectively excrete potassium, consuming these substitutes can lead to dangerously high potassium levels (hyperkalemia). Hyperkalemia can cause serious cardiac complications, making it crucial for dialysis patients to avoid salt substitutes.
Question 5: Patients with uremia develop foamy or bubbly urine because _________.
- the kidneys remove less water
- urination is less frequent
- protein leaks into the urine (Correct answer)
- wastes combine to create a chemical reaction
Correct answer: protein leaks into the urine
Foamy or bubbly urine in patients with uremia is often a sign of proteinuria, meaning protein is leaking into the urine. Damaged kidneys, unable to filter properly, allow larger protein molecules to pass through into the urine. When these proteins are present, they can create foam when the urine is agitated, indicating impaired kidney filtration.
Question 6: When using a slide board to transfer a patient from the dialysis chair to a wheelchair, at what angle should the slide board be placed between the two sitting surfaces?
- 30 degrees
- 45 degrees (Correct answer)
- 60 degrees
- 90 degrees
Correct answer: 45 degrees
When using a slide board to transfer a patient from one sitting surface to another, it should be placed at a 45-degree angle between the two surfaces. This angle provides optimal leverage and stability, facilitating a smooth and safe transfer while minimizing strain on both the patient and the caregiver. It ensures the patient can slide across with minimal effort.
Question 7: When the technician is teaching a patient to self-cannulate using the tandem-hand technique, the ________.
- patient observes and then carries out the procedure on a prosthetic training arm
- technician places the first needle, and the patient places the second
- technician places the thumb and finger behind the patient's thumb and finger
- patient places the thumb and finger behind the technician's thumb and finger (Correct answer)
Correct answer: patient places the thumb and finger behind the technician's thumb and finger
The tandem-hand technique for self-cannulation involves the patient placing their thumb and finger directly behind the technician's thumb and finger. This allows the patient to feel the correct pressure, angle, and depth, providing tactile feedback and guidance as they learn to perform the cannulation themselves. It's a hands-on teaching method that builds confidence and skill.
Question 8: A patient has a right internal jugular central venous catheter for hemodialysis, but a pressure alarm sounds during treatment indicating that the blood flow rate is lower than prescribed. On checking, the technician finds that the lines appear clear and there are no signs of kinking, bleeding, or air entering the system. The next intervention should be to __________.
- stop dialysis
- lower the patient's head and ask the patient to cough (Correct answer)
- flush the central venous catheter with normal saline
- reverse the arterial and venous lines
Correct answer: lower the patient's head and ask the patient to cough
If a central venous catheter (CVC) has a pressure alarm indicating low blood flow without visible issues, the problem might be catheter malposition or a small clot at the tip. Lowering the patient's head and asking them to cough can sometimes reposition the catheter tip or dislodge a minor obstruction, thereby improving blood flow. This is a common initial intervention before more invasive measures.
Question 9: Substances that form ions (charged particles) are __________.
- hormones
- electrolytes (Correct answer)
- enzymes
- amino acids
Correct answer: electrolytes
Electrolytes are substances that, when dissolved in water, dissociate into ions (electrically charged particles). These ions are crucial for various bodily functions, including nerve impulses, muscle contractions, and maintaining fluid balance. They play a vital role in cellular processes and overall physiological stability.
Question 10: Infections in buttonhole tracts are almost always caused by ___________.
- improper scab removal (Correct answer)
- poor skin preparation
- incorrect cannulation technique
- contaminated hands
Correct answer: improper scab removal
Infections in buttonhole tracts are most commonly caused by improper or incomplete scab removal before cannulation. If scabs are not thoroughly removed, they can be pushed into the tract during needle insertion, introducing bacteria directly into the bloodstream. Proper cleaning and meticulous scab removal are critical steps to prevent these infections and ensure patient safety.
Question 11: What percentage of the water that is filtered out of the blood by the glomeruli is excreted as urine?
- 0.50%
- 1% (Correct answer)
- 10%
- 99%
Correct answer: 1%
The kidneys filter a vast amount of water from the blood each day, but the body reabsorbs most of it to maintain fluid balance. Only about 1% of the water initially filtered by the glomeruli is ultimately excreted as urine. This efficient reabsorption mechanism is crucial for conserving essential body fluids and preventing dehydration.
Free CCHT Clinical Test 1
If a dialysis patient is very large in both stature and weight, which of the following is most likely to improve the effectiveness of hemodialysis?