[Electrocardiographic diagnosis of ventricular tachycardia in patients with previous myocardial infarct: frequency and significance of diverse diagnostic criteria].
Electrocardiographic tracings of ventricular tachycardia were recorded from 34 patients with old myocardial infarction. The diagnostic criteria of ventricular tachycardia were carefully assessed in each tracing. The most commonly observed signs were: 1) QRS duration greater than 140 msec; 2) a prevalent negative deflection in Lead V6; 3) an interval from the beginning of the QRS complex to the S wave nadir greater than 100 msec in at least one precordial lead. The cases were subdivided into two groups on the basis of a predominant positive or negative deflection in Lead V1 (Group 1 and 2, respectively). The most common signs in Group 1 were a monophasic R wave configuration of the QRS complex in Lead V1, and a QS configuration in Lead V6. On the other hand, the most frequent criteria in Group 2 were an interval between the beginning of the QRS complex and the S wave nadir greater than 60 msec in Lead V1, and a QS configuration in Lead V6. Furthermore, none of the cases reflected a normal frontal plane QRS axis, but an axis deviation was evident in all 29 cases where axis could be calculated.
Satullo
G
G
Istituto Pluridisciplinare di Clinica Medica, Università di Messina.
Cavalli
A
A
Ferrara
M C
MC
Luzza
F
F
Donato
A
A
Scimone
I M
IM
Saporito
F
F
Oreto
G
G
D003937:Diagnosis, Differential; D004562:Electrocardiography; D006352:Heart Ventricles; D006801:Humans; D009203:Myocardial Infarction / Q000150:complications*; D013610:Tachycardia / Q000175:diagnosis*; D013997:Time Factors
Diagnosi elettrocardiografica di tachicardia ventricolare in pazienti con pregresso infarto miocardico: frequenza e significato dei diversi criteri diagnostici.