What adverse effect should be monitored in patients taking fluoroquinolones?

• A. Photosensitivity
• B. ECG changes
• C. Red man's syndrome
• D. Bone marrow depression

Answer: (B)

Fluoroquinolones are a class of antibiotics that can lead to several potential adverse effects, with ECG changes being a notable concern. These drugs, particularly ciprofloxacin and levofloxacin, have been associated with an increased risk of QT interval prolongation on an electrocardiogram. This effect can predispose patients to serious arrhythmias, such as torsades de pointes, especially in those who have pre-existing conditions, are taking other medications that prolong the QT interval, or have electrolyte imbalances.

Monitoring ECG changes is crucial in patients, especially the elderly, those with underlying cardiac conditions, or those on concomitant medications known to impact cardiac rhythm. Detecting these changes early allows for prompt intervention and mitigates the risk of serious complications.

In contrast, while photosensitivity is a side effect associated with some antibiotics, it is more commonly noted with tetracyclines and sulfa drugs, rather than fluoroquinolones. Red man syndrome is an infusion-related reaction primarily linked to vancomycin, and bone marrow depression is not a typical adverse effect seen with fluoroquinolones, rather it's associated with certain chemotherapeutic agents or other classes of antibiotics. Together, these factors highlight the importance of understanding the