…Allow complete thawing — the thaw time should be at least as long as the freeze time , usually 30–60 seconds. 8. Repeat the cycle where…

…pair or couplet. If 3 to 30 premature ventricular contractions occur consecutively, it is referred to as non sustained ventricular tachycardia (if the rate is…

…and its temporal relationship to the ECG waveforms. The cardiac cycle begins in the sinus node (sinoatrial node), where depolarization occurs through automaticity (refer to…

…wave not followed by a QRS complex. This cycle repeats itself over and over again, such that every cycle ends with a blocked P wave…

…K + ) channels open which results in cell repolarization. The cycle then repeats itself ( Figure 1 ). Note that the leakage of sodium during the resting phase…

…it encompasses both synchronized cardioversion and defibrillation ; the key distinction is timing relative to the cardiac cycle, since a shock delivered asynchronously on the T…

…heart vector [3]. The orientation and intensity of this vector fluctuate throughout the cardiac cycle as depolarization and repolarization progress [3]. The mean electrical axis…

…The cardiac cycle starts when cells in the sinoatrial node discharge an action potential that spreads as an electrical impulse through the atria and – via…

…activation) and thus triggers another ventricular stimulation. This cycle may repeat itself so that a tachyarrhythmia is established. Pacemaker mediated tachycardia on ECG Pacemaker beats…

…a delay. This manifests with loss of P waves (loss of atrial activation) and consequently loss of QRS complexes (loss of ventricular depolarization). Sinoatrial blocks…

…the phase of the cardiac cycle) to terminate ventricular fibrillation. Cardioversion : Use of synchronized electric shock (i.e. a shock synchronized to the QRS complex)…

…the QRS complex will have a left bundle branch block morphology. However, left bundle branch block morphology is more common (regardless of heart rate) among…

…large T wave amplitude), and QT prolongation. Ventricular flutter Monomorphic VT at a rate ~300 bpm (cycle length 200 ms). Ventricular fibrillation Irregular, rapid ( 300…

…large T wave amplitude), and QT prolongation. Ventricular flutter Monomorphic VT at a rate ~300 bpm (cycle length 200 ms). Ventricular fibrillation Irregular, rapid ( 300…

…complex (defined as QRS duration <120 ms). The cardiac action potential The action potential includes a depolarization (activation) followed by repolarization (recovery). The cardiac cycle…

…the heart rate increases, the QT interval decreases and vice versa. The physiological purpose of this phenomenon is to allow for faster cardiac cycles during…

…rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute; (2) P wave precedes every QRS complex…

…minute. ECG criteria follow: Regular rhythm with a ventricular rate slower than 50 beats per minute. P waves with constant morphology preceding every QRS complex…

…rhythm (which is the normal rhythm) has the following characteristics: (1) heart rate 50–100 beats per minute; (2) P wave precedes every QRS complex…

…improve angina and quality of life, but randomized trials have not demonstrated reductions in mortality or myocardial infarction rates. Clinical presentation and symptoms The clinical…

Echocardiography The standard transthoracic echocardiographic examination This chapter presents a sequential series of images that comprise a complete standard echocardiographic examination. The image views are…

…course at ecgwaves.com. This website provides a comprehensive learning ecosystem. It includes a complete ECG book, enriched with over 600 pages, engaging video lectures…

Info The ECG shows AV block III (complete heart block). P waves are not related to QRS. PP interval is constant, but independent of RR…

…a diagnosis of third degree AV block if the atrial and ventricular rate is equal and the P waves occur right before the QRS complexes…

Cardiology Clinical medicine Definition and cardiovascular rationale Smoking cessation is the complete discontinuation of tobacco smoking, with avoidance of second hand smoke and, where possible…

…Definition and pathophysiology A chronic total occlusion (CTO) is a complete or nearly complete coronary arterial obstruction that has persisted for at least 30 days…

…lower case letters (q, r, s). Figure 5 shows examples of naming of the QRS complex. Net direction of the QRS complex The QRS complex…

…the plasma glucose, a blood gas and an ECG all come before complete identification of the substance. Treatment of acute poisoning consists of four parallel…

…Sepsis is a dynamic condition. Investigation and treatment must therefore proceed in parallel and must not wait for complete diagnostic certainty. Sepsis is defined as…

…necessary ECG skills required for clinical work. You must complete the ECG course in order to obtain your certificate. New ECG test will be added…

…Such a thrombus can cause occlusion of the artery. The occlusion may be complete or partial, depending on the size of the thrombus and the…

…interventions. As discussed previously, STEMI is the result of a complete and proximal occlusion in a coronary artery, which results in transmural myocardial ischemia. The…

…is the first line treatment and must be given early when anaphylaxis is suspected. Do not wait for a complete diagnosis or for grading. Antihistamines…

…deep neck infection, an expanding haematoma, facial trauma. An anticipated course requiring a secured airway — transfer, heavy sedation, surgery — and cardiac arrest. Contraindications There are…

…5. With severe symptoms: give hypertonic saline immediately. Do not wait for a complete work up of the cause or for imaging. 6. Document the…

…distended neck veins, muffled heart sounds Beck's triad; complete in a minority Tachycardia, tachypnoea, cold periphery Almost always Pulsus paradoxus above 10 mmHg A…

…mean nothing. Capture is verified only when every pacing spike is followed by a wide QRS complex and a pulse that can be felt. The…

…The complete physiological formulation considers coronary venous pressure: Distal coronary driving pressure: distal coronary pressure minus coronary venous pressure Normal coronary driving pressure: mean aortic…

…recovery patterns within the left ventricle, resulting in a widened QRS complex and secondary ST T wave abnormalities [7]. Diagnostic Criteria The diagnostic requirements for…

…Statins inhibit 3 hydroxy 3 methylglutaryl coenzyme A reductase, the rate limiting enzyme in cholesterol synthesis. Reduced hepatic cholesterol production increases hepatic LDL receptor expression…

…Deasy et al ). A complete airway obstruction results in PEA and cardiac arrest within 8 minutes. Cardiac arrest as a result of asphyxia or hypoxia…

…venous and arterial pressures are substantially reduced, potentially leading to complete obstruction of venous return by the uterus. This can be remedied by manual displacement…

…instability. Fewer than 1% of patients with ST elevation myocardial infarction (STEMI) who reach the catheterization laboratory are found to have complete LMCA occlusion, likely…

…due to the low concentration of gap junctions in AV nodal cells), which allows for ventricular filling to complete prior to ventricular contraction. In contrast…

…ischemia present in STEMI. In STEMI, a complete coronary artery occlusion leads to transmural ischemia, affecting a larger portion of the myocardium, thereby intensifying chest…

…of ST segment elevations. If the reperfusion is complete (after a total occlusion) the ST segment is normalized within one hour, and this confirms that…

…attack Life threatening attack : : : : Speech Full sentences Cannot complete a sentence in one breath Single words or unable to speak Position and behaviour Can lie…

…symptom onset or the time last known to be well NIHSS A complete score by a physician or nurse experienced in stroke Functional impact A…

…Working suction, oxygen and complete equipment for intubation and ventilation must be to hand before the lavage begins. The head of the trolley must be…

…no urethral catheter may be passed. An attempt can convert a partial rupture into a complete one. Contact the urologist or the surgeon on call…

…blood count, creatinine with eGFR and liver function tests before starting. A complete medication list including over the counter drugs, herbal remedies and supplements. An…

…burden should be reported using the Agatston score. A complete report should ideally include: Total Agatston score Calcium score in each coronary vessel Age , sex …

…or physiological criteria supporting revascularisation. Evaluation and Physical Examination Assessment should establish both clinical risk and the feasibility of complete revascularisation. The clinical evaluation includes…

…recovery and lower initial morbidity than CABG, with lower stroke rates, but it is associated with less complete revascularization, less durable relief of angina in…

…Progressive heart failure. Cardiogenic shock. Complete transection of a papillary muscle may cause immediately overwhelming MR. Partial rupture, often involving the tip or head of…

…for depolarization and repolarization. It is measured from the beginning of the QRS complex to the end of the T wave. Prolonged QT duration predisposes…

…and a complete physical and neurologic examination. Blood pressure and heart rate should be measured in the supine position and after 3 minutes of standing…

…is generally considered less effective than thoracotomy. This is because it does not ensure complete drainage of the pericardium, and needles or catheters are at…

…and the ensuing atherothrombosis, causes a complete occlusion of the coronary artery. Ischemia will extend from the endocardium to the epicardium in the affected myocardial…

…occluding smaller vessels downstream). The thrombosis causes occlusion of the artery; blood flow may be partially or completely obstructed. Consequently, the myocardium supplied by the…