Which methods can be used to evaluate the quality of CPR provided by the BLS team?

The use of a feedback device is an effective method to evaluate the quality of CPR performed by the BLS team due to its ability to provide real-time data on the performance of compressions. These devices can measure important metrics such as compression depth and rate, enabling rescuers to adjust their technique immediately during a resuscitation effort to ensure adherence to established guidelines. Feedback devices help in promoting effective chest compressions, which are crucial for maximizing blood flow during CPR.

Using arterial blood gas levels, while informative about overall patient status, does not provide immediate feedback during a resuscitation attempt and is not practical for on-the-spot evaluation of CPR quality. Capnography can provide information about the effectiveness of ventilations and circulation indirectly through the measurement of exhaled carbon dioxide, making it valuable in some settings. However, it is not a direct measure of CPR quality itself. Visual observation relies on the rescuer's subjective assessment and may not capture important aspects of CPR performance, such as compression depth and rate, which can lead to variations in quality.