…compromise and does not protect the airway completely. Relative contraindications: A high risk of aspiration: a non fasted patient, ileus, third trimester pregnancy, marked reflux…

…airway produces no reliable symptoms in a patient with an impaired cough reflex, and the first feed then becomes a direct instillation into the lung…

…and no obstructive stenosis in a major epicardial coronary artery. Non obstructive disease is generally defined as the absence of a stenosis of 50% or…

…chest discomfort; symptoms suggestive of myocardial ischaemia despite normal or non obstructive coronary arteries; dyspnoea; fatigue; and recurrent symptoms causing impaired quality of life. Women…

…or normal ↓↓ ↓ or normal ↑ or normal Obstructive (tamponade, PE) ↓ ↑ ↑ ↓ Vital signs and measures of perfusion Parameter Normal Comment :…

…predictor of future myocardial infarction or sudden death. Lesions causing only mild obstruction may rupture, thrombose and occlude. Many acute myocardial infarctions arise from lesions…

…likelihood of atherosclerotic obstructive CAD. CAC is therefore not merely an incidental imaging finding; it can refine the decision to test and may identify patients…

…age, height and ethnicity — not against absolute figures. Since 2022 the z score with a lower limit of normal at z = −1.64 (the…

…local availability, and cost. The pathophysiological substrate of angina may differ between patients. Myocardial ischaemia may result predominantly from obstructive epicardial coronary disease, coronary vasospasm…

…restenosis and stent thrombosis. Intravascular imaging may also clarify the mechanism of an acute coronary syndrome (ACS), particularly when angiography shows no significant obstructive disease…