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
Hence, the heart beats faster, which actually helps to increase the rate of heat loss from the body. Also, the dilation of blood vessels lowers the blood pressure. Hence, in order to restore normal blood pressure, the heart beats faster and pushes more blood through the blood vessels.here are several factors that affect the heart rate, the most common being exercise and noise. However, a little unknown factor that has shown to influence heart rate is temperature. A rise in body temperature, be it from environmental factors or a medical condition, causes an increase in the heart rate.