Final answer:
For two-person CPR on an adult, 100 chest compressions per minute are recommended, with proper hand placement between the T4 and T9 vertebrae to avoid injury.
Step-by-step explanation:
The appropriate number of chest compressions per cycle when performing two-person CPR on an adult patient is at a rate of 100 compressions per minute. This rapid pace is meant to mimic the beat of the song 'Staying Alive' and to ensure blood flow, especially to critical organs like the brain. When administered by two trained individuals, the task of compressions can be shared to maintain the recommended rate and depth without excessive fatigue. Understanding the proper position for hand placement on the sternum between the lines at T4 and T9 is crucial to avoiding severe injury to the patient such as broken ribs or damage to the liver from the xiphoid process. To ensure safety and effectiveness, it's essential for both medical professionals and members of the public to be certified and periodically recertified in CPR technique.