Ebook Making sense of the ECG (3rd edition): Part 2
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Ebook Making sense of the ECG (3rd edition): Part 2
^^The QRS complexNormal QRS complexes have a different appearance in each of the 12 ECG leads (Fig. 8.1).Fig. 8.1 Normal 12-lead ECGKey point:• appear Ebook Making sense of the ECG (3rd edition): Part 2rance of QRS complex varies from lead to leadWhen reviewing an ECG, look carefully at the size and shape of the QRS complexes in each lead and ask yourself the following four questions:•Are any QRS complexes too wide?•Are any QRS complexes an abnormal shape?In this chapter, we will help you to answe Ebook Making sense of the ECG (3rd edition): Part 2r these questions and to interpret any abnormalities you may find.•Are any R or s waves too big?The height of the R wave and depth of the s wave varyEbook Making sense of the ECG (3rd edition): Part 2
from lead to lead in the normal ECG (as Fig. 8.1 shows). As a rule, in the normal ECG:•the R wave increases in height from lead Vi to v5•the R wave is^^The QRS complexNormal QRS complexes have a different appearance in each of the 12 ECG leads (Fig. 8.1).Fig. 8.1 Normal 12-lead ECGKey point:• appear Ebook Making sense of the ECG (3rd edition): Part 2 the deepest s wave does not exceed 25 mm in depth.Always look carefully at the R and s waves in each lead, and check whether they conform to these criteria. If not, first of all consider:•ECG calibration (should be 1 mV = 10 mm).If the calibration is correct, consider whether your patient has one o Ebook Making sense of the ECG (3rd edition): Part 2f the following:•left ventricular hypertrophy•right ventricular hypertrophy•posterior myocardial infarction•Wolff-Parkinson-White syndrome•dextrocardiEbook Making sense of the ECG (3rd edition): Part 2
a.Each of these conditions is discussed below.If the QRS complex is also abnormally wide, think of:•bundle branch block (discussed later in this chapt^^The QRS complexNormal QRS complexes have a different appearance in each of the 12 ECG leads (Fig. 8.1).Fig. 8.1 Normal 12-lead ECGKey point:• appear Ebook Making sense of the ECG (3rd edition): Part 2eads that ‘look at’ the right ventricle - Vi and v2.There are many criteria for the ECG diagnosis of left ventricular hypertrophy, with varying sensitivity and specificity. Generally, the diagnostic criteria are quite specific (if the criteria are present, the likelihood of the patient having left v Ebook Making sense of the ECG (3rd edition): Part 2entricular hypertrophy is >90 per cent), but not sensitive (the criteria will fail to detect 40-80 per cent of patients with left ventricular hypertroEbook Making sense of the ECG (3rd edition): Part 2
phy). The diagnostic criteria include:• In the limb leads:-R wave greater than 11 mm in lead aVL-R wave greater than 20 mm in lead aVF-s wave greater ^^The QRS complexNormal QRS complexes have a different appearance in each of the 12 ECG leads (Fig. 8.1).Fig. 8.1 Normal 12-lead ECGKey point:• appear^^The QRS complexNormal QRS complexes have a different appearance in each of the 12 ECG leads (Fig. 8.1).Fig. 8.1 Normal 12-lead ECGKey point:• appearGọi ngay
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