Increased QRS amplitude
Fig. 8.2; Table 1 The ECG signs of right ventricular hypertrophy (RVH). The impact of RVH is on the QRS axis (which shifts to the right (a) and the right-sided…
Q waves and loss of R wave height
Fig. 9.2 ECGs showing Q waves. (a) Anterior wall myocardial infarct; sinus rhythm, P wave is unremarkable. Pathological Q waves in leads V1–3, really quite deep, with biphasic T waves,…
The normal P wave
Fig. 4.2 (a) Timing and size of the contribution of right and left atria to the shape of the P wave. Right atrial depolarization occurs first, and occupies the first…
Strengths and weaknesses of the ECG
Fig. 2.2 The reliability of the ECG in diagnosis and management. The ECG is a powerful tool, useful diagnostically and therapeutically in suspected cardiac disease, in non-cardiac problems, e.g. non-accidental…
AV Conduction Disorders
3.2 AV Conduction Disorders 1st Degree AV Block Mechanism: Delay in impulse conduction at the AV node without interruption of this impulse ECG characteristics: No pause Prolongation of the PQ…
Sinus Arrythmias
3.1 Sinus Arrythmias Sinus Bradycardia Mechanism: Slow diastolic depolarization of the sinus node ECG characteristics: Sinus rhythm with a frequency of less than 60 per minute Etiology: Sinus node syndrome,…
Acute Myocardial Infarction
4.4 Acute Myocardial Infarction Acute Myocardial Infarction Anatomical pathology: Necrosis zone: Electrically inactive zone (infarction Q) Lesion zone: Cells markedly damaged by ischemia form abnormal potentials without participating in excitation,…
