Final answer:
If a tourniquet fails to stop bleeding, applying a second tourniquet closer to the heart without loosening the first one is recommended (option 4) . Emergency medical attention should be sought, and pressure should be continued, always by individuals trained in such emergency procedures.
Step-by-step explanation:
If applying a tourniquet did not stop the person's bleeding, the best course of action would be to apply a second tourniquet, closer to the heart but not directly over joints, where the first tourniquet is placed. This is because once a tourniquet is placed, it should not be loosened or removed as this could dislodge blood clots that have formed. It's important that any adjustment to a tourniquet be made only by a trained professional.
If bleeding continues despite the use of tourniquets, it is crucial to seek emergency medical attention immediately. While waiting for help to arrive, continue to apply pressure and ensure the injured person is as comfortable and calm as possible, without giving them food or drink. Remember that use of tourniquets is an advanced first aid measure and should only be employed when absolutely necessary and by those trained to do so.