The DMRC's Anuj Dayal claims that this has been completed in a record time compared to any other work on the tunneled segment
of the metro network.
The length and depth of tunneled segment
can be accurately determined by CT.
Therefore, a possible compression of myocardium in tunneled segment could not be evaluated.
Since it is an extremely rare anomaly, clinical significance of this variation whether this variation compresses the tunneled segment or not are not known.
There is an evidence from pathophysiologic and intravascular ultrasound studies that the arterial segment proximal to the myocardial bridge (MB) has a higher frequency of atherosclerosis, whereas the tunneled segment
is relatively spared.
Muscle overlying an epicardial segment of a coronary artery, first mentioned by Reyman in 1737 (1), is termed a myocardial bridge, and the artery coursing within the myocardium is called a tunneled artery, It is characterized by systolic compression of the tunneled segment, which remains clinically silent in the vast majority of cases.
While previously considered a clinically insignificant variant, ICD recordings demonstrated an increased flow velocity in the tunneled segment.
Most new pipe installed on the projects utilizes ductile iron except for tunneled segments
where pipe diameters were less than 42 inches; then, vitrified clay was used.