"Myocardial bridge" was the term for the heart
muscle fibre that covered the coronary artery segment. Because the myocardial
bridge caused endothelial damage to the coronary arteries, it was linked to
coronary atherosclerosis and myocardial ischemia. In the current work, the
myocardial bridge was used to examine the ultrastructural alterations of the
coronary artery endothelium in human adult postmortem hearts. The study
compares calcium depositions and endothelial characteristics under scanning
electron microscopy in four different coronary artery segments. The North
Okkalarpa General and Teaching Hospital in Yangon is where the sample was
taken. Among the 243 cases, 45 adult autopsied hearts exhibited myocardial
bridges that had been measured for length and thickness. Then, in the same
postmortem hearts, a segment from the coronary artery without a myocardial
bridge and three portions of the coronary artery from the proximal, beneath,
and distal segments of the coronary artery with a myocardial bridge were
extracted to serve as controls. With the use of an energy dispersion X-ray
spectrometer and a scanning electron microscope (Phenom Pro X) operating at 15
kV, the endothelial characteristics and elemental composition of each specimen
were studied (EDS). In the current investigation, out of the 243 hearts, 45
bridges (18.5%) were found, and 100% of them were found on the left anterior
descending artery (LAD). The myocardial bridge measured an average of 18.3 mm
by 11.7 mm (range 1.5-59 mm). The myocardial bridge was 2.8 mm on average with
a 1.5 mm variance (range 1-6.3 mm). The proximal segment had a significantly
different endothelial grading from the under-bridging segment, distal segment,
and control segment when endothelial cell gradings were compared. The distal
segment was very different from the under-bridging segment. The distal portion
and the under-bridging segment did not differ significantly from the control
segment. Comparing the proximal segment to the under-bridging segment, distal
segment, and control segment, calcium deposition was significantly different.
Similar calcium deposits were found in the distal segment and control segment
of the under-bridging section. The distal segment did not change from the
control segment appreciably (P 0.05). Due to the haemodynamic alterations
brought on by the myocardial bridge, the proximal segment sustained the most
endothelial damage. The myocardial bridge in the under segment may have an
atheroprotective effect because it was the endothelial damage location with the
least amount there.
Author(s) Details:
Sann Lin Ko,
Department of Anatomy, Defence Services Medical Academy,
Mingalardon, Yangon, Myanmar.
Thin Thin Win,
Department of Anatomy, Defence Services Medical Academy,
Mingalardon, Yangon, Myanmar.
Khine Zaw Oo,
Defence Services Medical Research Centre, Nay Pyi Taw, Myanmar.
Tun Tun Win,
Department of Preventive and Social Medicine, Defence Services
Medical Academy, Mingalardon, Yangon, Myanmar.
Aye Moe Moe Kyaw,
Department of Anatomy, Defence Services Medical Academy,
Mingalardon, Yangon, Myanmar.
Please see the link here: https://stm.bookpi.org/RABS-V4/article/view/7587
No comments:
Post a Comment