…at risk of developing symptoms. The most common non reversible causes of sinus bradycardia are sinus node dysfunction, side effects of medications and acute myocardial…

…MI). MI denotes cardiomyocyte necrosis occurring in the clinical setting of acute myocardial ischaemia and is diagnosed according to the fourth universal definition of MI…

…myocardial ischaemia caused by transient abnormal vasoconstriction of one or more coronary arteries. Epicardial spasm produces a reversible functional occlusion and usually causes transmural ischaemia…

…the injury resulted from acute myocardial ischaemia. Thus, a patient may have acute myocardial injury without having an infarction. The degree of troponin elevation does…

…disease and advanced CKD. The clinical course is often more rapidly reversible than that of other forms of acute tubular necrosis, although the complication remains…

…spectrum of rhythm disturbances characterized by an inappropriately slow heart rate. Within the context of acute coronary syndromes, particularly ST elevation myocardial infarction (STEMI), ischemic…

…ischaemia, coronary spasm, thrombosis, fever, acute starvation, and dieting. Clinicians should maintain a high index of suspicion for drug induced arrhythmias in patients receiving agents…

…electrolytes, acid base status and the underlying cause. KDIGO recommends prompt investigation of reversible causes, continuing staging, and treatment directed at both the cause and…

…recordings confirming a bradyarrhythmia. Potentially reversible causes should be pursued (Table 2). Figure 1. Management of acute bradycardia in the emergency setting. Parameter Assessment A…

…and are potentially reversible etiologies when promptly and appropriately addressed. Both venous and arterial blood gases can be utilized for the analysis of electrolyte levels…

…phenytoin, carbamazepine), and various chemotherapeutic agents. In the acute setting, bradyarrhythmic cardiac arrest or asystole may result from reversible systemic insults, including hypovolemia, hypoxia, cardiac…

…thoracic surgery, acute myocardial infarction, pericarditis/myocarditis or pulmonary embolism is often a reversible arrhythmia with low risk of recurrence. Atrial fibrillation in other circumstances…

…not a treatment review. For a fuller account of two of the commonest acute drug problems, see Warfarin therapy and Opioid therapy in severe pain…

…improve symptoms, functional capacity and quality of life. The underlying aetiology is heterogeneous. Chronic heart failure evaluation should therefore seek reversible or treatable causes. The…

…or a large area of myocardium at risk. Over 48 hours: urgent PCI is still indicated with continuing ischaemia, shock, serious arrhythmia or acute heart…

…messages Two things set the COPD exacerbation apart from many other causes of acute dyspnoea: oxygen must be titrated cautiously and the blood gas determines…

…speech, work of breathing, level of consciousness and PEF improve at the same time. Acute severe asthma is characterised by bronchospasm, mucosal oedema and mucus…

…dissection CT of the brain Exclude intracerebral haemorrhage and assess early ischaemic changes CT angiography The standard investigation in acute stroke to identify large vessel…

…is: Continuous acute dizziness with spontaneous nystagmus: consider HINTS plus, but only if the examiner is trained. Brief attacks triggered by the position of the…

…regurgitation, pulse deficits, or visceral ischaemia. Approximately 25% of PAUs are discovered incidentally on imaging, although an incidental lesion may subsequently become symptomatic or progress…

Clinical medicine Emergency medicine Definition and pathophysiology Acute limb ischaemia (ALI) is an abrupt reduction in arterial perfusion of an upper or lower limb that…

…by limited cardiopulmonary reserve or other adverse comorbidity. The classification of acute PE comprises four clinically useful groups: High risk PE , also termed massive PE…

…ventricular hypertrophy (RVH) from posterior acute ischemia. Both these conditions cause ST segment depressions in V1–V3 along with large R waves ( Figure 2 shows…

…of oral morphine per day, and 25 micrograms/hour to approximately 40–50 mg of oral morphine per day. Patches have no place in acute…

…to prevent or treat acute and subacute ventricular arrhythmias. The Singh Vaughan Williams classification fails to clarify that the majority of these agents exert effects…

…findings. OMI is defined by acute coronary artery occlusion causing transmural ischemia and requiring urgent reperfusion, even in the absence of classic ST elevation. Multiple…

ECG Myocardial ischemia and infarction Classification, diagnosis and definitions of acute coronary syndromes (ACS) and acute myocardial infarction (AMI) Acute coronary syndromes occur when atherosclerotic…

…Symptoms – Patients with acute myocardial infarction may present with typical ischemic chest pain, or with dyspnea, nausea, unexplained weakness, or a combination of these symptoms…

…nonfatal myocardial infarction, transient ischemic attack or stroke, and initiation of renal replacement therapy. The study found no significant differences between the two treatment groups…

…or fully occlusive intraluminal thrombus [5] . ACS Classification The clinical spectrum of Acute Coronary Syndromes encompasses Unstable Angina (UA), Non ST Elevation Myocardial Infarction (NSTEMI)…

…be studied in detail. Figure 2. The electrocardiographic natural course in STEMI (ST elevation myocardial infarction). Pitfalls Acute transmural ischemia located in the basal portio

…rate of treatment are determined by the affected organ function, not by the blood pressure figure alone [2]. A markedly raised blood pressure without acute…

…V7, V8 and V9 in patients with high suspicion of posterior acute myocardial infarction (e.g due to reciprocal ST segment depressions in V1, V2…

…haemodynamically unstable patients, evaluation must also consider acute severe mitral regurgitation, mechanical complications, and ischaemia related ventricular failure as potential causes of shock. Patients with…

…demonstrated increased ischaemic complications. In a large network meta analysis, 3 month DAPT, but not 6 month DAPT, was associated with higher rates of myocardial…

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

ECG Myocardial ischemia and infarction Use of ECG in acute coronary syndromes & chest pain patients An ECG must be performed on all patients seeking medical…

…prevent ischemia from occurring during exercise stress testing, which leads to false negative stress tests. Studies have shown that if the myocardium obtains 30% of…

…arise when facing a patient with left bundle branch block (LBBB) and symptoms of ischemia follows: Left bundle branch block (LBBB) can mimic acute STEMI …

…et al, Twerenbold et al) Kinetics Troponin T (cTnT) and troponin I (cTnI) increase 2 3 hours after the onset of acute myocardial infarction. The…

Indications Acute myocardial infarction. Unstable coronary artery disease. Stable angina pectoris. Secondary prophylaxis to prevent recurrence of cerebrovascular diseases, such as: Transient ischemic attacks (TIA…

Procedurer In acute circulatory failure it is not the number of cannulae that matters but the flow per unit time . A large bore, short cannula…

…Although myocardial ischemia may affect every aspect of the ECG – from heart rhythm to QTc interval – the most prominent and reliable ECG changes occur in…

ECG Myocardial ischemia and infarction Acute myocardial infarction (AMI) always affects the left ventricle Myocardial infarction is virtually synonymous with left ventricular infarction . All myocardial…

Myocardial ischemia and infarction Pharmacology & dosing Definition and pathophysiology Atherosclerosis and acute coronary syndromes have important inflammatory components. Inflammation contributes to atherothrombosis through activation of…

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…

…well as estimating the extent of ischemia. After revascularization procedures, stress testing is utilized to assess whether there is any residual ischemia or angina pectoris…

…previously (refer to Classification of Acute Coronary Syndromes, and Ischemia and the ST Segment and ST segment depressions), a rehearsal of ECG characteristics and criteria…

…once the exercise is stopped. Some experts believe that these ST segment depressions represent a benign form of subendocardial ischemia. Refer to Exercise Stress Testing…

…the greater extent of ischemia present in STEMI. In STEMI, a complete coronary artery occlusion leads to transmural ischemia, affecting a larger portion of the…

…acute (ongoing) ischemia. Isolated T wave inversions – i.e T wave inversions without concomitant ST segment deviation (elevation or depressions) – is never a sign of…

…Diagnosis of Chest Pain: A Clinical Overview The evaluation of acute chest discomfort requires a systematic differential diagnosis, as the syndrome associated with ischemic heart…

…wall disruption, rupture and compromise of branch vessels. Type A disease may cause cardiac tamponade, severe acute aortic regurgitation, coronary malperfusion, myocardial ischaemia, heart failure…

Cardiology Critical care Pharmacology & dosing Definition and Pathophysiology In the management of acute heart failure and cardiogenic shock, intravenous vasoactive agents are categorised according to…

…through formation of an intramural haematoma that compresses the true lumen. The resulting reduction in coronary blood flow may produce myocardial ischaemia, acute coronary syndrome…

…UA) is an acute coronary syndrome characterized by myocardial ischaemia occurring at rest or with minimal exertion, without evidence of acute cardiomyocyte injury or necrosis…

…Some factors vary from second to second (e.g. degree of ischemia, parasympathetic and sympathetic tone) while others take months or years to develop (e…

…sex , and genetically influenced effects on the cardiovascular system. Acute exposure produces transient haemodynamic and myocardial effects, whereas sustained heavy consumption is associated with hypertension…