Anatomical dissection of 150 adult heart specimens revealed the Thebesian valve was absent in 20% of cases, and Fibres of Chiari were present in 10%.
Observational (n=150)
Anatomical variations in the coronary sinus ostium area are common and their identification may help overcome difficulties in treating arrhythmias and in cardiac surgery.
Classic anatomical dissection of 150 heart specimens from adults aged 18 - 80 years was performed. The Thebesian valve was absent in 20% of cases and, in these, 4% had a large ostial valve of the middle cardiac vein in front of the coronary sinus ostium. Fibres of Chiari were found in 10% of cases. Ostia of the middle cardiac vein, posterior veins of the left ventricle, small cardiac vein and deep cardiac veins were present in the distal 10 mm of the coronary sinus. Some samples had ostial and/or parietal valves or antivalves that sometimes contained muscular fibres. Distal accessory parietal valves (2%) and antivalves (1%) of the coronary sinus wall were found at a distance of 4 - 7 mm from its ostium. The frequency and variability of anatomical structures in the area of the coronary sinus ostium probably influence the haemodynamics of this area. Knowledge of and being able to identify these anatomical variations may help in identifying and overcoming potential difficulties in treating arrythmias and in cardiosurgery.
Pejković et al. (2008) conducted an observational in Anatomical variations of the coronary sinus ostium (n=150). Anatomical variations of the coronary sinus ostium was evaluated on Anatomical variations of the coronary sinus ostium area. Anatomical dissection of 150 adult heart specimens revealed the Thebesian valve was absent in 20% of cases, and Fibres of Chiari were present in 10%.