Protect invasive lines or tubes-correct answer is d : protect invasive lines or tubes. tpa is a potent thrombolytic enzyme. because bleeding is the most common side effect, it is essential to protect invasive lines from accidental dislodgement and excessive bleeding.thrombolytics, such as tpa, may be given if the stroke is caused by a blood clot. such medicine breaks up blood clots and helps restore blood flow to the damaged area. persons who receive thrombolytics are less likely to have long-term stroke-related problems. however, not everyone can receive this type of medicine. the most important rule is that the person be examined and treated by a specialized stroke team within 3 hours of when the symptoms start.