PADI Divemaster Certification Practice Exam

What is the purpose of using Doppler ultrasound monitoring in diving?

1. To prevent equipment failure

2. To verify dive time

3. To detect bubbles in the bloodstream

4. To improve water visibility

The correct answer is: To detect bubbles in the bloodstream

The purpose of using Doppler ultrasound monitoring in diving is to detect bubbles in the bloodstream. When a diver ascends too quickly or experiences certain decompression issues, nitrogen gas that has been absorbed into the body may form bubbles as it comes out of solution. These bubbles can potentially enter the bloodstream and lead to decompression sickness, also known as "the bends." Doppler ultrasound is a non-invasive imaging technique that can be used to monitor the presence of these bubbles in the venous circulation. It works by emitting sound waves and analyzing their reflections to visualize the blood flow and detect any bubbles that could indicate the risk of decompression sickness. By identifying these bubbles early, divers can take appropriate precautions or seek medical attention to mitigate any potential health risks associated with decompression sickness. The other options, while related to diving, do not pertain to the specific function of Doppler ultrasound monitoring. For instance, preventing equipment failure, verifying dive time, and improving water visibility are important aspects of safe diving practices, but they do not involve the detection of bubbles in the bloodstream, which is the principal reason for employing Doppler ultrasound in this context.