What does no-reflow mean?
No-reflow is defined as inadequate myocardial perfusion through a given segment of the coronary circulation without angiographic evidence of mechanical vessel obstruction (4). In the current era of interventional equipment and techniques, no-reflow occurs in 0.6% to 3.2% of PCI cases (5,6).
What causes no reflow phenomenon?
In summary, the cause of no-reflow can be classified into four main pathogenetic components: distal athero-thrombotic embolization, ischemia-related and/or reperfusion-related injury, as well as the susceptibility of coronary microcirculation to injury.
How do you treat no-reflow?
Intracoronary nitroprusside at doses of 50 to 300 μg is quite effective in the treatment of no-reflow. When injected distally in the coronary artery, it will have negligible systemic effect on the blood pressure but will induce marked improvement in coronary flow and myocardial tissue blush.
What is slow flow or no flow?
Introduction. No-reflow or slow-flow phenomenon is one of the serious complications of percutaneous coronary interventions (PCI) in acute myocardial infarction (AMI), as well as during elective procedures, and is an independent predictor of myocardial infarction, and in-hospital and long-term mortality [1, 2].
How do you treat no reflow?
What is a stunned myocardium?
“Stunned” myocardium is myocardium that suffers transient reversible myocardial contractile dysfunction induced by acute ischemia wherein the blood supply is almost completely restored on reperfusion and suffers no metabolic deterioration.
What TIMI 0?
TIMI 0 flow (no perfusion) complete blockage – absence of any antegrade flow (forward flow) beyond a coronary occlusion. TIMI 1 flow (penetration without perfusion) is faint antegrade coronary flow beyond the occlusion, with incomplete filling of the distal coronary bed.
What is the symptom that presents itself in the ACS Division of Cardiovascular Disease?
The most common symptom of ACS is chest pain. The chest pain may come on quickly, come and go, or get worse with rest. Other symptoms can include: Pain in the shoulder, arm, neck, jaw, back, or belly area.
What causes slow flow heart?
Coronary slow-flow phenomenon (CSFP), also known as cardiac syndrome Y, is characterized angiographically by delayed distal vessel opacification in the absence of obstructive coronary artery disease and represents a pathology related to underlying dysfunction of microvascular resistance.
What causes coronary slow flow?
Similarly, coronary slow flow was associated with higher levels of plasma soluble adhesion molecules, including intercellular adhesion molecule-1, vascular cell adhesion molecule-1 and E-selectin (40).
What is the difference between myocardial hibernation and myocardial stunning?
Definitions: Stunned myocardium is viable myocardium salvaged by coronary reperfusion that exhibits prolonged postischemic dysfunction after reperfusion. Hibernating myocardium is ischemic myocardium supplied by a narrowed coronary artery in which ischemic cells remain viable but contraction is chronically depressed.
What is myocardial hibernation?
The term “hibernating myocardium” refers to the presence of persistently impaired LV function at rest, due to a reduced coronary blood flow that can be partially or completely restored to normal after revascularization.
What is the grace score?
The GRACE Score is a prospectively studied scoring system to risk stratifiy patients with diagnosed ACS to estimate their in-hospital and 6-month to 3-year mortality. Like the TIMI Score, it was not designed to assess which patients’ anginal symptoms are due to ACS.
What causes no reflow of blood in myocardial infarction?
In a clinical situation in which no reflow is caused mainly by distal emboli, treating this condition may prevent infarct extension. To decrease the incidence of this phenomenon during short-term intervention for myocardial infarction, patients need to undergo the intervention as soon as possible.
Which model provides a definite diagnosis for no reflow?
The model that provides a definite diagnosis for no reflow in humans is coronary intervention in acute myocardial infarction. A patient may present to the catheterization laboratory with total coronary occlusion. After elimination of the epicardial coronary occlusion, the blood flow may slow down or cease in some patients.
Does no reflow reduce the size of myocardial infarction?
Treating no reflow may not necessarily reduce the size of myocardial infarction because the microvascular damage is usually confined well within the zone of myocardial necrosis. However, treating no reflow may enhance the delivery of blood and blood-borne elements to the necrotic area, thus speeding healing.
What is the pathophysiology of No reflow?
As stated in the definitions sections, no reflow can also be considered an abrupt onset of TIMI zero flow during an elective percutaneous coronary intervention which could be due to epicardial spasm. This pathophysiology would benefit from intracoronary nitroglycerin.