Acute Dengue-associated Myocarditis in a Resource-limited Setting: A Case Series From Côte D'ivoire
This case series from Côte d'Ivoire documents four young male patients with acute dengue-associated myocarditis, highlighting the condition's diverse clinical presentations, the diagnostic utility of cardiac magnetic resonance imaging, and the critical need for balanced fluid management in resource-limited settings.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Dengue fever is a widespread illness carried by mosquitoes, known for causing high fevers, severe body aches, and pain behind the eyes. For most people, the disease runs its course and fades away, but for a small number of patients, it can turn dangerous, attacking organs far beyond the blood vessels. This severe progression is known as expanded dengue syndrome, a condition where the virus triggers a chaotic immune response that can damage the liver, kidneys, or brain. Among the most frightening and least understood of these complications is damage to the heart muscle itself. While the heart is often the engine that keeps the body moving, in these rare cases, the virus or the body's own defense system can inflame the heart tissue, leading to weakness, dangerous irregular rhythms, or a complete stop in the electrical signals that tell the heart to beat. Understanding how this happens is critical, especially in regions where advanced medical tools are scarce, because missing these signs can be fatal.
In a recent report from Côte d'Ivoire, a team of doctors at Treichville University Hospital in Abidjan shared the stories of four young men who arrived with severe dengue fever that had turned into acute heart inflammation. These patients, all male and ranging in age from their twenties to their forties, presented with a mix of symptoms that went beyond the typical fever and rash. Some arrived with crushing chest pain and shortness of breath, while others fainted repeatedly or felt their hearts racing out of control. The medical team discovered that in every single case, the heart was under attack, but the way it failed looked different for each person. One patient suffered from a sudden, severe weakening of the heart's pumping power, while another developed a high-grade block that stopped the electrical signals from reaching the lower chambers of the heart, forcing doctors to insert a temporary wire to keep his heart beating. A third man had a specific type of electrical block that required a pacemaker, and the fourth showed clear signs of heart muscle injury on an electrocardiogram despite having a heart that still pumped normally.
What made this series of cases particularly valuable was the use of advanced imaging to see exactly what was happening inside the heart muscle. In two of the patients, doctors used a powerful magnetic resonance scanner, a machine that creates detailed pictures of the heart's soft tissues, to confirm the diagnosis. These images revealed swelling and specific patterns of scarring on the outer layers of the heart muscle, a signature that proved the inflammation was caused by the viral infection rather than a blocked artery or a heart attack. The doctors also relied heavily on blood tests, specifically looking for a protein called troponin, which leaks into the bloodstream when heart muscle cells are damaged. In all four cases, this protein was found at levels thousands of times higher than normal, serving as a loud, consistent warning sign that the heart was in trouble, even when other symptoms were vague.
The treatment these men received was a careful balancing act. Because dengue fever often causes fluid to leak out of blood vessels, doctors usually give patients large amounts of fluids to keep them stable. However, when the heart is inflamed and weak, too much fluid can drown the heart and make the failure worse. The medical team had to navigate this delicate trade-off, giving just enough support to keep the patients alive without overloading their struggling hearts. For the man with the electrical block, they used a temporary pacemaker to take over the job of starting the heartbeat, and they gave him steroids to calm the inflammation in the conduction system. For the others, they used standard heart medications to reduce strain and help the muscle recover. Remarkably, all four patients survived their ordeal. Their heart function returned to normal, their electrical rhythms stabilized, and they were discharged from the hospital within a week or two, fully recovered.
This report highlights a crucial reality for doctors working in resource-limited settings: heart complications from dengue are likely more common than we realize, but they are often missed because the necessary equipment to see them is not always available. In many parts of the world, a magnetic resonance scanner is a luxury, but the doctors in this study showed that a combination of careful observation, standard heart sound checks, and simple blood tests can still lead to a correct diagnosis and successful treatment. They found that the heart damage could appear at different stages of the illness, sometimes striking right when the fever was highest and other times appearing as the patient seemed to be recovering. This suggests that the immune system's reaction to the virus can be unpredictable and damaging at any point. While the study was small and focused on just four patients, it serves as a vital reminder that during dengue outbreaks, doctors must keep a sharp eye on the heart. By recognizing the warning signs early and managing fluid levels with precision, even in hospitals with limited technology, it is possible to save lives from this rare but deadly complication.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.