(85.73 [+ or -] 8.20) was decreased after mental stress when compared to that of rest 87.47 [+ or -] 6.87 and it was statistically not significant and there was a decrease in QRS axis (63.41 [+ or -] 34.61) and PR interval (137.71 [+ or -] 18.78) during acute stress when compared to that of rest 61.82 [+ or -] 19.89 and 140.69 [+ or -] 22.79 which were statistically not significant.
Electrocardiograms (a) 10 days after admission showing atypical atrial flutter with a wide QRS complex
of 280 milliseconds and (b) 2 days later, after treatment, showing atypical atrial flutter with normalization of the QRS complex
with a QRS duration of 100 milliseconds.
In the present study, it was observed that the most frequent ECG changes were P-pulmonale and Right Axis Deviation of QRS complex
seen in grade II and III severity, which is statistically significant.
Clear presence of normal sinus rhythm, with narrow QRS complexes
in both monitor strips (marked by red arrows in Figure 1).
The QT interval was calculated as the time from the start of the QRS complex
to Te and the QTc was calculated using Bazett's formula.
Beat-to-beat detection and classification of the QRS complexes
allow the heart rhythm evolution to be followed and arrhythmias such as premature ventricular contractions (PVC) to be detected.
Prominent positive atrial repolarization waves ([T.sub.a]) are seen after the QRS complexes
in leads II, III, and aVF giving rise to ST segment elevation, mimicking ST elevation myocardial infarction.
In the largest series to date of HBP in patients with heart block postprosthetic valve replacement, Sharma and colleagues included four patients post-TAVI--all Edward SAPIEN valves: in two cases, HBP was unsuccessful and a standard right ventricular lead was placed--in the remaining two patients, HBP was employed successfully to correct RBBB in one case and to retain a narrow QRS complex
in the other .
Typically, in the ECG delineation process, the algorithm firstly detects the QRS complex
, which is the most pronounced wave of the heartbeat.
location is important and even essential for ECG signal processing.
The QRS complex
was measured as the interval between the initial QRS depolarization and the J point.
The analysis of the different cardiac waves in the ECG signals is of major importance; the P wave represents the depolarization wave that spreads from the sinoatrial node throughout the atria; the QRS complex
represents ventricular depolarization, while the T wave represents ventricular repolarization.
As in this case, bradycardia along with an absent P wave, wide QRS complex
, and peaked (tentorial) T wave characterize hyperkalemia on the electrocardiogram.
The QTc time was calculated using the Bazett formula by measuring the time from the beginning of the QRS complex
to the end of the T wave and dividing this to the square root of the RR interval.
(6) presented a 16-year-old girl who took 2.4 g propafenone and had extreme QRS complex
widening and prolonged PR interval on ECG.