Heart position in the chest
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Heart Position in the Chest: Anatomical Location and Variations
Typical Heart Location in the Chest Cavity
The heart is a muscular organ located in the mediastinum, which is the central compartment of the thoracic cavity. It sits behind the sternum (breastbone), above the diaphragm, and between the two lungs. The heart is generally positioned slightly to the left of the midline of the chest, with its apex (the pointed end) directed downward, forward, and to the left. The vertebral column lies behind the heart, and the sternum is in front of it, providing protection within the rib cage 289.
Variations in Heart Position: Constitutional and Anatomical Factors
The position of the heart within the chest can vary based on individual body types (constitutional types). The angle of the heart’s axis, measured relative to a horizontal line through the heart’s apex, determines its position:
- Oblique Position (43–48°): Most common and considered physiological, typically seen in individuals with a normosthenic (average) body type.
- Vertical Position (49–60°): More common in asthenic (slender) individuals.
- Horizontal Position (30–42°): More often found in hypersthenic (broad-chested) individuals.
These variations are important because certain heart positions are associated with specific health risks. For example, a horizontal heart position is linked to hypertension, while a vertical position may be associated with valve prolapse or conduction abnormalities .
Positional Changes: Supine vs. Prone and Clinical Implications
The heart’s position can also change depending on body posture. When a person moves from a supine (lying on the back) to a prone (lying on the stomach) position, the heart shifts anteriorly (toward the front of the chest). This anterior displacement brings the lateral and superior aspects of the heart closer to the chest wall, which can have implications for procedures like breast cancer radiotherapy and may affect intracardiac blood flow dynamics 57. Prolonged prone positioning can influence heart function and may contribute to heart failure in susceptible individuals .
Congenital and Pathological Variations: Dextrocardia and Other Anomalies
Rarely, the heart may be located on the right side of the chest, a condition known as dextrocardia. In some cases, dextrocardia is accompanied by situs inversus, where the positions of other organs are also mirrored. This condition is usually congenital and not caused by external factors. Dextrocardia with situs inversus is rare and often discovered incidentally during imaging for other reasons 310. In fetuses, abnormal heart positions are most commonly due to diaphragmatic hernias, but can also result from congenital heart disease, lung anomalies, or chromosomal abnormalities .
Surgical and Clinical Considerations
Understanding the heart’s position is crucial for surgical approaches, especially in cardiac surgery and resuscitation. The anterior mediastinum, located in front of the heart, is often used for surgical access because it contains fewer vital structures. During cardiopulmonary resuscitation (CPR), the most effective external chest compressions are achieved when pressure is applied at the sternoxiphoid junction, where the heart’s ventricles are most accessible beneath the sternum 24.
Conclusion
The heart is typically located in the center-left of the chest, behind the sternum and between the lungs, but its exact position can vary based on body type, posture, and congenital anomalies. These variations are clinically significant for diagnosis, risk assessment, and surgical procedures. Recognizing and understanding these differences is essential for effective medical care and intervention.
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Most relevant research papers on this topic
PECULIARITIES OF HEART POSITION OF MATURE AGE PEOPLE OF VARIOUS CONSTITUTIONAL TYPES
Oblique heart position is the most common in mature age individuals, regardless of their constitutional type, and may serve as additional risk factors for developing cardiovascular diseases.
DOI
Position and Observation of the Heart and Surgical Approaches
The heart is a muscular organ in the mediastinum, with the anterior mediastinum being the most common surgical approach, and the posterior mediastinum containing important structures like the trachea and esophagus.
DOI