Relationship between Age; Radiographic Normal Heart Size and Cardio-Thoracic Ratio in a Nigerian Population

ABSTRACT

Background: Cardio-vascular disease (CVD) is now on the increase. The precise diagnosis of CVD is of immense clinical importance to the cardiac surgeons; pathologist and also for cardiologists. However; information on normal values for various cardio-vascular structures in Nigeria; a country with the highest population of blacks in the world is sparse. In this regard the age-related radiographic sizes of a Nigerian cohort of patients with non-cardiogenic complaints or consultations were therefore assessed.Objectives: To evaluate the limits of normal cardiac size in our environment ; determine if there was a relationship between the age and size of the heart and to evaluate the relationship between sex and cardiac size and cardio-thoracic ratio.Design: A cross-sectional study.Setting: The Radiology department of University of Ilorin Teaching Hospital; Ilorin; North Central Nigeria between January to June 2012.Subjects: One Hundred patients were consecutively recruited and their chest radiographs examined after fulfilling the inclusion criteria.Results: Males accounted for 55% of the study population. The age range was 1 month to 73 years; (Mean = 29.3; SD =2.41668). The mean cardiac size was 11.7cm. The average cardiac size for adult males and females; were 11.6cm and 11.5cm respectively while that of thoracic size was 29.0cm and 26.8cm respectively. Correlation between age and cardiac size was 0.66; age and thoracic size was 0.64 and between cardiac size and thoracic size was 0.89. The paired sample t-test for age and cardiac size was less than 0.05 (p value 0.05).Conclusion: knowing the average values of cardiac size for adult males and females (11.6cm and 11.5cm) and thoracic size (29.0cm and 26.8cm) respectively from this study presents a base line for early detection of variation from normal cardiac measurements in this environment