Clinical Epidemiology, Phenotypes, and Seasonal Patterns of Heart Failure Among Hospitalized Patients in Northeastern Nigeria: A Five-Year Multicenter Retrospective Study
This five-year retrospective multicenter study in Northeastern Nigeria reveals that heart failure predominantly affects middle-aged women, is primarily driven by hypertensive heart disease and peripartum cardiomyopathy, and exhibits significant seasonal and temporal admission patterns linked to environmental and infectious factors.
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
Heart failure is not a single disease but a final common pathway for many different ways the heart can struggle. It happens when the heart muscle becomes too weak or too stiff to pump blood effectively to the rest of the body. This failure leads to a buildup of fluid in the lungs and legs, causing shortness of breath, extreme tiredness, and swelling. While this condition is well-known in wealthy nations, where it often affects older adults with a history of heart attacks, the story is different in many parts of the developing world. In these regions, the causes often differ, and the people affected tend to be much younger. Understanding how heart failure behaves in specific environments is crucial because the triggers that make the condition worse can change depending on where you live, what the weather is like, and what diseases are common in the community.
A team of researchers recently looked closely at this problem in northeastern Nigeria, a region that had not been studied in detail before. They examined the medical records of 620 patients admitted to two major teaching hospitals between 2018 and 2022. Their goal was to understand who was getting sick, why, and when these hospital visits happened. They wanted to see if the patterns in this part of Africa matched what is seen in Europe or America, or if the local climate and lifestyle created a unique picture.
The study revealed that heart failure in this region strikes people in the middle of their lives, with the average patient being just over 50 years old. This is significantly younger than the typical patient in high-income countries. The researchers also found a surprising gender split: nearly 60 percent of the patients were women. This female predominance is largely driven by a specific condition called peripartum cardiomyopathy, which is a form of heart failure that occurs during or shortly after pregnancy. This condition accounted for nearly one-fifth of all cases in the study, making it the second most common cause of heart failure in this group. The most common cause overall, however, was damage to the heart caused by long-term high blood pressure, which affected nearly two-thirds of the patients.
When the patients arrived at the hospital, they were often in very serious condition. Most had reached a stage where they could not perform basic daily activities without becoming breathless, and many were suffering from fluid buildup in their lungs. The researchers looked at the pumping strength of the heart for those who had ultrasound scans and found that the majority had a heart that was weak and struggling to squeeze blood out, rather than a heart that was simply stiff. This distinction is important because it points to a different type of damage than what is typically seen in aging populations elsewhere.
The timing of these hospital admissions told a compelling story about the local environment. The researchers noticed that the number of patients did not stay the same throughout the year. Instead, there was a clear pattern where admissions surged during the middle of the year, specifically in the hot, pre-rainy months and the peak of the rainy season. This is the opposite of what happens in colder climates, where heart failure cases usually spike in the winter. In northeastern Nigeria, the heat and the humidity of the rainy season appear to act as a trigger. The data showed that chest infections were the most common reason patients' conditions suddenly got worse, leading to hospitalization. It seems that the combination of extreme heat, which puts stress on the body, and the spread of respiratory infections during the rainy season overwhelms hearts that are already weakened by high blood pressure or other issues.
The study also captured a brief dip in hospital admissions in 2020, which coincided with the global pandemic, before numbers bounced back in the following years. This suggests that when healthcare access is disrupted, fewer people get admitted, but the underlying need for care remains. The researchers concluded that heart failure in this part of Nigeria is a distinct challenge, affecting a younger, predominantly female population driven by high blood pressure and pregnancy-related complications. The clear link between the rainy season, infections, and worsening heart failure suggests that managing these environmental and infectious triggers could be just as important as treating the heart itself. By understanding these local patterns, doctors and health officials can better prepare for the times of year when the system will be under the most pressure.
Drowning in papers in your field?
Get daily digests of the most novel papers matching your research keywords — with technical summaries, in your language.