Algorithm proposed for detection of CSI
In this algorithm, the first step in symptomatic patients with a positive blood culture suspected of CSI is imaging, such as transthoracic echocardiography, to identify features of infective endocarditis or endarteritis. If the imaging is positive, further imaging, such as PET, that supports the diagnosis, should be adequate to support a diagnosis and treatment.
If initial imaging is negative, alternative diagnoses should be considered, but Dr. Ramakumar advised repeat imaging after 48 hours if symptoms persist and no other causes are found.
Dr. Ramakumar acknowledged the many limitations of this analysis, including the small sample size and the challenges of assembling coherent data from case reports with variable types of information submitted during different eras of PCI evolution. However, reiterating that CSI might be frequently missed, he emphasized that this problem might be bigger than currently understood.
It is difficult to rule out any possibility that CSI is frequently missed, but Andrew Sharp, MD, PhD, a consultant interventional cardiologist at the University Hospital of Wales, Cardiff, is skeptical.
“One might think this is a potential problem, but I cannot think of one patient in whom this has occurred,” Dr. Sharp said in an interview. He is fairly confident that they are extremely rare.
“When there is infection associated with a foreign body, such as a pacemaker, they do not typically resolve by themselves,” he explained. “Often the device has to be removed. If this was true for CSI, then I think we would be aware of these complications.”
However, he praised the investigators for taking a look at CSI in a systematic approach. An invited panelist during the CRT featured research, which is where these data were presented, Dr. Sharp was more interested in understanding why they do not occur now that data are available to suggest they are rare.
“Is there something in the coronary environment, such as the consistent blood flow, that protects against infection?” he asked. CSI is a valid area of further research, according to Dr. Sharp, but he does not consider infected stents to be a common threat based on his own sizable case series.
Dr. Ramakumar and Dr. Sharp reported no potential conflicts of interest.