Final answer:
After cystoscopy, concerning vital sign changes include significant cardiovascular abnormalities, dark urine, abdominal pain, persistent vomiting, or constipation. Severe symptoms may indicate serious complications or dehydration, necessitating immediate medical attention.
Step-by-step explanation:
After a cystoscopy, the most ominous changes in vital signs include severe cardiovascular abnormalities, such as a significant change in blood pressure and heart rate. These symptoms can indicate the onset of a serious complication, such as a severe infection or a reaction to anesthesia. Additionally, if a patient experiences darkening of urine upon standing, severe abdominal pain, vomiting, or constipation after the procedure, they should seek medical attention immediately. While some degree of nausea, diarrhea, and vomiting can occur within the first 24-48 hours after a cystoscopy, persistent symptoms could lead to dehydration, which is another concerning change that requires prompt medical intervention.