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The heart is under the lower third of the sternum. Implications for external cardiac massage
Insights
Current guidelines suggest the infant heart is mid-sternum, but this study found it consistently lower. This finding may necessitate revisions in cardiopulmonary resuscitation techniques for children.
Area of Science:
- Pediatrics
- Cardiology
- Anatomy
Background:
- Current cardiopulmonary resuscitation (CPR) guidelines for pediatric patients recommend chest compressions over the midsternum.
- These guidelines are based on the assumption that the infant heart's position shifts downward with age.
Purpose of the Study:
- To investigate the anatomical position of the heart in infants and children.
- To verify the accuracy of current CPR guidelines regarding pediatric cardiac location.
Main Methods:
- A study involving 55 patients (1 day to 19 years), including premature infants, was conducted.
- Cardiac position was determined using chest X-rays or heart angiography with radiopaque markers and computer digitization.
- A Cartesian coordinate system was employed to precisely locate the cardiac silhouette and/or right ventricle.
Main Results:
- The heart was consistently located under the lower third of the sternum across all age groups studied.
- Statistical analysis revealed no significant differences in cardiac position between different age cohorts.
Conclusions:
- The study's findings challenge the current understanding of pediatric cardiac anatomy relevant to CPR.
- Current recommendations for external cardiac massage in infants and children may require revision based on the actual heart location.
Abstract:
Current guidelines for cardiopulmonary resuscitation in children state that the heart lies under the midsternum in infancy and descends with age. To verify this statement, we studied 55 patients, aged 1 day to 19 years, including eight premature infants, during either routine chest x-ray films or right-sided heart angiography. Using a Cartesian coordinate system determined by radiopaque markers placed on the chest, and computer digitization, we located the center of each patient's cardiac silhouette and/or right ventricle. Using descriptive statistics, we found that the heart lay under the lower third of the sternum in all age groups. Analysis of variance indicated that there was no significant difference in this location between age groups. These results suggest that recommendations for external cardiac massage in infants and children may need to be revised.