Results of signal-averaged electrocardiography and electrophysiologic study in patients with nonsustained ventricular tachycardia after healing of acute myocardial infarction
Key result
Inducible sustained VT after inferior MI is linked to ~13 ms longer filtered QRS duration.
- P<0.01
- n=183
Why the study?
The influence of infarction site on signal-averaged electrocardiogram characteristics in patients with nonsustained ventricular tachycardia after myocardial infarction was unclear.
Does signal-averaged electrocardiography identify inducible sustained VT in patients with nonsustained VT after healed myocardial infarction?
Comparison
Patients with inducible sustained VT vs patients without inducible sustained VT and control groups
Design
Observational study with programmed stimulation and signal-averaged electrocardiography
Authors
Discussion
Loading...
Member takes
Implication
Longer filtered QRS was associated with inducible VT; leaves open SAECG utility for risk stratification after inferior MI.
Study Design
Type
Observational (n=183)
Structured PICO
Does signal-averaged electrocardiography identify inducible sustained VT in patients with nonsustained VT after healed myocardial infarction?
P
Population
183 patients after myocardial infarction, including 43 with nonsustained VT, 45 without ventricular arrhythmias, and 95 with spontaneous and inducible sustained VT.
E
Exposure
Signal-averaged electrocardiography and programmed stimulation (electrophysiologic study)
C
Comparator
Patients without inducible sustained VT, and control groups (no arrhythmias, sustained VT)
O
Outcome
Filtered QRS duration and voltage in the last 40 ms of the filtered QRS complex, and inducibility of sustained VTsurrogate
Main Result
Absolute Event Rate: 125% vs 112%
p-value: p=<0.01
Signal-averaged electrocardiography may be useful in identifying patients with nonsustained VT after a remote inferior myocardial infarction who have inducible sustained VT.
Cite This Study
Buxton et al. (1987) conducted an observational in Nonsustained ventricular tachycardia after acute myocardial infarction (n=183). Inducible sustained ventricular tachycardia vs. No inducible sustained ventricular tachycardia was evaluated on Filtered QRS duration (p=<0.01). Among patients with nonsustained VT after inferior myocardial infarction, those with inducible sustained VT had significantly longer filtered QRS durations (125 vs 112 ms, p<0.01).