An incomplete form of Kawasaki disease in a 2-month-old girl. How the diagnostic algorithm works in practice

Abstract

BACKGROUND. Kawasaki disease is a rare, self-limiting inflammatory disease primarily affecting children under 5 years old. In 25 % of cases, it can lead to coronary artery aneurysms if not treated promptly with intravenous human immunoglobulin. A significant portion of Kawasaki disease patients present with an incomplete form, complicating diagnosis, while the risk of coronary artery aneurysms remains unchanged. Particularly vulnerable are infants under 6 months old, who may exhibit even more limited clinical symptoms, making them especially susceptible to severe cardiac complications. OBJECTIVE. To analyze a clinical case of an incomplete form of Kawasaki disease in a 2-month-old girl, raise awareness of Kawasaki disease, including its incomplete form, among healthcare workers in Ukraine, emphasize the critical importance of proper diagnostic evaluation of coronary arteries, and underscore the necessity of early administration of immunoglobulin when Kawasaki disease is suspected, even in the absence of pathological changes in the heart. MATERIALS AND METHODS. The study involved collecting medical history, physical examination data, laboratory and instrumental studies, and their analysis. The diagnosis of Kawasaki disease, including its incomplete form, was based on the 2017 recommendations of the American Heart Association. CLINICAL CASE. A 2-month-old girl presented with symptoms initially resembling a urinary tract infection, with no therapeutic response to multiple courses of antibacterial therapy. During the second week of illness, she developed swelling in her hands and feet, which, along with persistent fever, significant inflammatory response, and lack of improvement with antibiotics, led to the suspicion and diagnosis of Kawasaki disease based on the algorithm for incomplete Kawasaki disease. After administration of an immunomodulatory dose of intravenous human immunoglobulin at 2 g/kg on the 11th day of illness, there was a rapid regression of symptoms, normalization of inflammation markers, and overall improvement in the child's condition. By the second week of illness, small aneurysms of the right and left coronary arteries had formed but regressed within a few weeks from the onset of the disease. CONCLUSIONS. Kawasaki disease requires prompt therapeutic intervention and should be suspected in any child, especially those under one year of age, with a high fever lasting at least 5 days, unexplained by a preliminary diagnosis, and no response to antibiotic treatment in the presence of “bacterial” blood tests. Serial echocardiograms assessing coronary arteries, absolute dimensions, and Z-scores are mandatory.

Keywords

• kawasaki disease
• children
• coronary artery aneurysms
• intravenous human immunoglobulin
• acetylsalicylic acid
• z-scores