What happens if the sinoatrial node SA is damaged?
If the sinus node is not functioning normally — due to damage from surgery, drugs, congenital heart defects or other causes — the heartbeat may become very slow with a decrease in blood pressure. Sinus node dysfunction may lead to an abnormally slow heart rhythm called bradycardia.
What is sinoatrial node artery?
The sinoatrial nodal artery (SANa) is a highly variable vessel which supplies blood to the sinoatrial node (SAN). Due to its variability and susceptibility to iatrogenic injury, our study aimed to assess the anatomy of the SANa and determine the prevalence of its anatomical variations.
What supplies blood to the sinoatrial node?
The sinoatrial node was supplied by a unique source represented by the right coronary artery in 37 cases (74%) and by the circumflex artery in 8 cases (16%), and by a double source represented by two branches of the right coronary artery in 2 cases (4%) and of both coronary arteries in 3 cases (6%).
What coronary artery Perfuses the SA node?
Right coronary artery (RCA). The right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes, which regulate the heart rhythm.
How long can you live with sinus node dysfunction?
Prognosis of sinus node dysfunction is mixed; without treatment, mortality is about 2%/year, primarily resulting from an underlying structural heart disorder.
Can we live without the sinoatrial node?
Issues of Concern In such cases, the SA node will not function properly and can result in a condition known as sick sinus syndrome. Without normal sinus node function or blockage of the sinus node impulse, other myocytes with automaticity, or an ectopic focus, will become the new pacemaker.
What are the branches of right coronary artery?
Right coronary artery
- Anterior branches. Conal branch. Sinuatrial nodal branch. Anterior atrial branches.
- Marginal branches. Right marginal (acute) artery. Lateral atrial branches.
- Inferior branches. Atrioventricular branches. Inferior (posterior) interventricular branch. Interventricular septal branches.
What is the role of sinoatrial node?
The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.
Which coronary artery is the Widowmaker?
The widow-maker is a massive heart attack that occurs when the left anterior descending artery (LAD) is totally or almost completely blocked. The critical blockage in the artery stops, usually a blood clot, stops all the blood flow to the left side of the heart, causing the heart to stop beating normally.
Which heart chamber has the thickest myocardium?
left ventricle
Coordinated contraction of cardiomyocytes causes the heart to contract and expel blood into circulation. The myocardium is thickest in the left ventricle, as the left ventricle must create a lot of pressure to pump blood into the aorta and throughout systemic circulation.
Where does the sinoatrial nodal artery come from?
Right coronary artery in 60% of cases and the left coronary artery in 40% of cases. The artery turns posteriorly below the superior vena caval opening. The SA node can arise from its own opening in the anterior aortic sinus. A study of 516 SA nodal arteries using MDCT found 96.4% of arteries were single whilst 3.6% were double.
Which is nodal branch brings blood to the atrioventricular node?
In contrast, the atrioventricular nodal branch, that is the artery that brings blood to the atrioventricular node, depends on coronary artery dominance. The sinoatrial node surrounds the sinoatrial artery, which can run centrally (in 70% of individuals) or off center within the node.
Which is the left side of the sinoatrial artery?
A left S-shaped sinoatrial artery, originating from the proximal left circumflex or LCx artery, has been described as a common variant in approximately 10% of human hearts.
Where does the Conal branch of the RCA originate?
Variations of each coronary vessel are very common in the general population. The conal branch of RCA can originate directly from the right aortic sinus when it is referred to as the third coronary or preinfundibular artery.
