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,…
Reentry Tachycardia
3.11 Reentry Tachycardia AV Nodal Reentry Tachycardia (Slow–Fast Type) Termination mechanism: After establishing the reentry circuit, sudden blockade of retrograde conduction in the fast pathway, hence no excitation of the…
Right Bundle Branch Block
3.3 Right Bundle Branch Block Isolated Complete Right Bundle Branch Block Mechanism: Delayed conduction in the right bundle branch, secondary (delayed) excitation of the right ventricle via the left ventricular…
