…backscatter of the light signal. Imaging is therefore typically performed during contrast injection or another method of temporary blood displacement. OCT is particularly useful for…

ECG Myocardial ischemia and infarction Approach to patients with chest pain: differential diagnoses, evaluation and management Chest pain is one of the most common symptoms…

…or other professionals. A physician is always formally responsible for conducting the test. All personnel must be appropriately trained and the laboratory must be equipped…

…rate. Within the context of acute coronary syndromes, particularly ST elevation myocardial infarction (STEMI), ischemic injury can disrupt the conduction system at any level, producing…

…with several simultaneous renal insults. Infection, hypovolaemia, cardiac dysfunction, haemodynamic instability, anaemia and other nephrotoxic exposures may contribute to tubular injury, making attribution to contrast…

…in increased levels of circulating pro inflammatory cytokines that may cause plaque rupture (i.e the risk of atherosclerotic plaque rupture is increased during infections)…

…of infection. Indications Infusion of vesicant solutions: vasopressors, concentrated potassium, cytotoxic drugs, parenteral nutrition. The need for several simultaneous, incompatible infusions. Haemodialysis, plasmapheresis or other…

…electronic cigarettes or other inhaled products. Readiness to attempt cessation. Depression, schizophrenia, schizoaffective disorder, HIV infection or other circumstances that may affect cessation or treatment…

…a pulse that can be felt. The other predictable error is forgetting that pacing hurts a great deal in a conscious patient. Indications Immediate (transcutaneous)…

…course (no more than 7 days) may be given to selected patients with an eGFR of 30 40 mL/min for lower urinary tract infection…

…Septic phlebitis, ongoing soft tissue infection with systemic involvement. Relative: Condition Adaptation : : ABI 0.5–0.79 Reduced compression (20–30 mmHg) under vascular surgical…

…protection. Asthma and other marked obstructive airways disease — relative; the risk of bronchospasm is real. Hypotension and haemodynamic instability. Respiratory compromise during an ongoing crisis…

…The pericardial space (cavity) always contains a small amount of serous fluid which acts as a lubricant that prevents friction during ventricular contraction and relaxation…

…mentioned below are discussed in detail in other chapters, to which links are provided throughout the text. Heart rate During the first week of life…

…of sinus tachycardia are as follows: Normal (physiologic) sinus tachycardia: The automaticity (rate of spontaneous depolarization) in the sinoatrial node is increased during physical activity…

…produced during its first passage through the circulation. Due to this rapid clearance, adenosine must be administered as a rapid intravenous bolus. Unlike many other…

Myocardial ischemia and infarction Definition and Pathophysiology No reflow is impaired anterograde myocardial perfusion despite the absence of a flow limiting epicardial coronary stenosis. It…

ECG Myocardial ischemia and infarction Myocardial ischemia: cellular changes, ECG signs and development of infarction Like all other cells in the human body, cardiac myocytes…

…is given. An ECG without ischemic ST T changes when recording during chest pain is not consistent with myocardial ischemia. In other words, chest pain…

…Thus, the 12 lead ECG does not display ST segment elevations during posterior (posterolateral) transmural ischemia. On the other hand, leads V1–V3 (occasionally V4…

…Other causes include acute mechanical complications—particularly ventricular septal defect (VSD) and papillary muscle rupture with acute severe mitral regurgitation—predominant right ventricular (RV) infarction…

…necrosis and cardiac troponin elevation, although not every patient with an initial STEMI pattern has myocardial infarction as the final diagnosis. The underlying process usually…

…is slightly simplified. In reality, the course in acute myocardial infarction (AMI) is modified by several factors. The most important of these, and their implications…

Myocardial ischemia and infarction ECG Definition and Pathophysiology Acute coronary syndromes (ACS) encompass a spectrum of clinical conditions characterized by a recent change in symptoms…

…ischemia that only affects the subendocardium). STEMI, on the other hand, is caused by a complete coronary artery occlusion, which results in the complete stop…

…Thus, the 12 lead ECG does not display ST segment elevations during posterolateral transmural ischemia. On the other hand, leads V1–V3 (occasionally V4) may…

…to cause ischaemia, recurrent symptoms, myocardial infarction, or other major adverse cardiovascular events. Complete revascularization is therefore considered an important therapeutic objective, particularly in patients…

…myocardial infarction and stroke Likelihood of repeat revascularization Symptom burden and treatment goals Diabetes, left ventricular function and other comorbidities Surgical risk and contraindications to…

…0.03 Other complications 0.28 Total major complications 1.70 In another large diagnostic catheterization analysis, mortality was approximately 0.2%, myocardial infarction approximately…

…acute coronary syndrome (ACS), DAPT is used to reduce recurrent myocardial infarction, stent thrombosis and other ischemic events after coronary angiography, percutaneous coronary intervention (PCI…

…thrombosis is approximately 1% during the first year after stenting, although the risk is higher after treatment of ST segment elevation myocardial infarction (STEMI) and…

…NSAIDs). Other contraindications: Hemophilia. Thrombocytopenia. Active gastric or duodenal ulcers. Liver cirrhosis. Severe heart failure. Doses 100 mg/day during the third trimester of pregnancy…

…disruption. Fewer than 5% of thin capped fibroatheromas have been identified as the source of an acute myocardial infarction during long term follow up. Moreover…

Cardiology Myocardial ischemia and infarction Definition and pathophysiology Fractional flow reserve (FFR) is an invasive, lesion specific physiological index used to estimate the functional significance…

Cardiology Myocardial ischemia and infarction Definition and pathophysiology Vasospastic angina (VA), formerly termed Prinzmetal or variant angina, is myocardial ischaemia caused by transient abnormal vasoconstriction…

ECG Myocardial ischemia and infarction ST segment elevation in acute myocardial ischemia ST segment elevations with straight (horizontal, upsloping, or downsloping) or convex ST segment…

…and reversible mismatch between myocardial oxygen demand and blood supply, generally during exertion, emotional stress, or another stressor. Manifestations include angina, other chest discomfort, dyspnoea…

Cardiology Myocardial ischemia and infarction Definition and Clinical Purpose Myocardial perfusion imaging (MPI) with single photon emission computed tomography (SPECT) or positron emission tomography (PET…

…that remains unchanged with stress generally indicates previous infarction. Extensive ischaemia may produce a reduction in global LVEF and transient LV cavity dilatation during stress…

Cardiology Myocardial ischemia and infarction Definition and conceptual framework Acute coronary occlusion is the abrupt or progressive reduction of coronary blood flow sufficient to produce…

ECG Myocardial ischemia and infarction ST segment depression due to acute myocardial ischemia ST segment depressions caused by ischemia are characterized by a horizontal or…

…comparisons of serial examinations. If pathology is discovered during the standard examination, other examinations (which are not included in the standard examination), may be warranted…

…administration, warnings, precautions, and other relevant information for the drug Ticagrelor . Table 1 Summary Indications Ticagrelor, in combination with acetylsalicylic acid (ASA), is indicated for…

ECG Exercise stress test Exercise stress testing in patients with previous acute coronary syndromes (myocardial infarction), women, elderly and revascularized individuals Clinicians should be familiar…

…focal neurological symptoms. Asymptomatic disease may be discovered during targeted duplex ultrasound (DUS), pre operative assessment, or evaluation of other atherosclerotic disease. Routine population screening…

…with coronary artery disease when clinically appropriate. Other coronary anomalies Anomalous coronary origin and course can impair coronary perfusion, particularly during vigorous exercise. In AAOCA…

…vascular autoregulation during a rapid or severe rise in BP. This may produce acute injury in the brain, retina, heart, aorta, kidneys, or other vascular…

…the first time during its management, or arise during the course of treatment. Even transient, self terminating AF during ST elevation myocardial infarction may indicate…

…other tachyarrhythmias predispose to developing atrial fibrillation: atrial flutter, AVNRT and AVRT (pre excitation, WPW syndrome) being the most common. Atrial fibrillation with onset during…

…infarction or scar tissue, where perfusion remains reduced under both conditions. Reverse redistribution : A less common pattern where defects appear worse at rest than during…

…1961). A total of 500 cases of fatal myocardial infarction were examined. The authors reported that 60–70% of all cases had no myocardial disease…

…limb lead II. Normal (physiological) causes of sinus bradycardia Sinus bradycardia (SB) is considered a normal finding in the following circumstances: During sleep . Well trained…

…tachypnoea, cold periphery Almost always Pulsus paradoxus above 10 mmHg A fall in systolic blood pressure during inspiration; one of the most useful signs Low…

…cells, macrophages, neurons and other tissues. This distribution helps explain why PA produces cardiovascular injury beyond its effects on blood pressure and potassium balance. The…

…provided that other causes of right axis deviation have been excluded. Causes of left axis deviation Left bundle branch block. Left ventricular hypertrophy. Inferior infarction…

…provided that other causes of right axis deviation have been excluded. Causes of left axis deviation Left bundle branch block. Left ventricular hypertrophy. Inferior infarction…

…artery disease has been classified into the following three syndromes: Stable angina pectoris : Symptoms appear primarily during exercise or other situations with increased myocardial load…

…artery disease has been classified into the following three syndromes: Stable angina pectoris : Symptoms appear primarily during exercise or other situations with increased myocardial load…

…Cardiac surgery and other iatrogenic cardiovascular procedures Acute aortic disease, particularly ascending or type A aortic dissection Myocardial free wall rupture after infarction Anticoagulant associated…

…elevation. The presence and age of onset of premature CAD or other vascular disease. A history of myocardial infarction or raised cholesterol among relatives. The…