Upper UTIs are infections of the kidneys. These are potentially life threatening, if bacteria move from the infected kidney into the blood. This condition is called sepsis. Sepsis can cause dangerously low blood pressures, shock, and death.
So whe you hold your breath, you stop getting oxygen in your lungs that go to your heart. The oxygen level in the blood drops, so your muscles need more oxygen, so the heart pumps faster. This is like running, your muscles need more oxygen so heart pumps faster
If you reach 11 minutes and 35 seconds, congratulations! You are now tied for the world record. For most of us the ability to hold our breath lasts 30 seconds, maybe even 1 or 2 minutes. Much longer than that and the sensation that your lungs are bursting becomes too painful to endure.