…Atrial fibrillation with onset during hyperthyroidism (thyrotoxicosis), alcohol overdose, thoracic surgery, acute myocardial infarction, pericarditis/myocarditis or pulmonary embolism is often a reversible arrhythmia with…

…levels do not have any effect on the ECG, nor cardiac rhythm, or impulse conduction. 2. Calcium Hypercalcemia Causes of hypercalcaemia Primary hyperparathyroidism and malignancies…

…coronary vasospasm, microvascular dysfunction, or combinations of these mechanisms. Drug selection can therefore be tailored to the suspected mechanism. No antianginal class has demonstrated consistent…

…or coronary anatomy unsuitable for further intervention. In ANOCA/INOCA, coronary atherosclerosis, endothelial dysfunction, and distinct coronary functional abnormalities may produce ischaemia without an obstructive…

…primary hyperparathyroidism or neoplastic etiologies. Other causes include immobilization, sarcoidosis, thyrotoxicosis, familial hypocalciuric hypercalcemia, Addison's disease, renal insufficiency, therapeutic interventions with tamoxifen or lithium…