What should CPR providers always ensure regarding the surface under the victim?

CPR providers should always ensure that the surface under the victim is flat and firm for several critical reasons. A firm surface helps provide effective chest compressions, allowing the provider to generate adequate force to compress the chest and circulate blood effectively. If the surface is soft or uneven, it may absorb some of the compressive force, leading to ineffective resuscitation efforts and potentially delaying the return of spontaneous circulation.

A flat surface also minimizes the risk of injury to the victim's spine and allows for better positioning of the provider, facilitating optimal technique and reducing the risk of fatigue during prolonged efforts. Therefore, ensuring a flat and firm surface is crucial for the efficacy of CPR and the overall chance of survival for the victim.