Arrhythmias (alnal and ventricular) In today's clinical practice, for the diagnosis of the arrhythmias, ECG's help is of supreme value, because accura

described It is to ba remembered, hyperkatemia (excess concentration of K+ ions in the ECF) can be rapidly fatal In early stages of hyperkalemia, T wave becomes Latter As the hyperkalemia progresses, AV block acid atnal paralysis develop, so that prolonged PR interval and absence of P are found in ECG record QRS becomes prolonged due to delayed conductivity in the ventricular conducting system 7. Arrhythmias (alnal and ventricular) In today's clinical practice, for the diagnosis of the arrhythmias, ECG's help is of supreme value, because accurate diagnosis is usually nol possible otherwise. However the issue is complex and mis author thinks that they should be better learnt from bigger Letfs HOW TO READ ECG Finally, some Lips are given below, about how to read ECG records of a given subject 1.Count [he heart rate (see above, for the techmc) 2 See whether the rhythm is sinus or not Sinus rhythm means where the pace maker is SAN. In sinus rhythm, the normal sequence of P, Q, R, S.T are maintained and P waves are upright where they should be upnght. Now-a-days, the condition, 'sick sinus rhythm', is increasingly diagnosed In this condition, there is damage of Ihe SAN (= sick sinus) rasullmg in severe bratiycardia and even syncopal attacks ECG however may show only bradycardis and nothing else It should be remembered, that Ihe rhythm may be 'normal sinus rhythm' (NSR) but there may be other signs of cardiac damage 9n the ECG For example, in a case of NSR there can be marked depression of ST segmenl (ischemia). In a normal ECG record., the heart rate (HR) fluctuates For example ai the beginning of a given ECG record Ihe HR may be 7Q/min, but wilhm a few seconds, as me ECG recording continues, Ihe HR may be 75/min This is normal and is due to (usually) respirahon and is called 'normal sinus arr