QRS complex (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.
Prolongation in the PR interval
on electrocardiography (ECG) is a minor diagnostic finding of rheumatic fever.
Although there are no reports of cardiac toxicity among patients subjected to prophylaxis including ATV, it is recommended to orient and monitor workers with previous conduction disorders or concomitantly using medication likely to prolong the PR interval
, such as beta blockers, calcium channel blockers and digoxin, for treatment of bradyarrhythmia symptoms.
The electrocardiogram on admission showed sinus rhythm with a PR interval
of 212 milliseconds and a QRS duration of 112 milliseconds.
The vascular risk factors for stroke [hypertension (HT), diabetes mellitus (DM), hypercholesterolemia (HCL)], ECG parameters (QTc interval, PR interval
, QRS duration, RR interval and ST depression), LVH, laboratory tests (sedimentation, hemogram, routine biochemistry tests, CK-MB and TnI levels) and drugs used were recorded.
The ECG was evaluated for different intervals like PR interval
(0.120-0.200 sec), QRS, QT interval, QTc interval (Male--< 0.42, Female--< 0.44 sec) and TP interval.
Occasionally, they are seen as shallow negative deflections right after the P wave in conditions with prolonged PR interval
, but they are best seen in patients with complete heart block, when the [T.sub.a] waves and QRS complexes are uncoupled .
The mean PR interval
was significantly prolonged after donepezil administration (P < 0.05).
At the time of TAVI, the patient developed LBBB (average QRS duration of 180 ms) with a prolonged PR interval
of 240 ms (Figure 1(b)).
The blood pressure (BP) was 125/72 mmHg and heart rate (HR) was 76 bpm after percutaneous coronary intervention (PCI) operation without prolonged PR interval
(192 ms) and ST segment depressed to baseline.
Irreversible CAVB is the main cardiac manifestation in over 80% of reported cases. The spectrum of manifestation is still expanding and the followings are recently reported: fetal prolonged PR interval
, first-and second-degree AVB, EFE, prolongation of corrected QT interval, sinus bradycardia (SB), late-onset DCM, atrial flutter, valvular insufficiency, ventricular/valvular hyperechogenicity, pericardial effusion, and other heart disorders even in the absence of cardiac block.,,,,
(6) presented a 16-year-old girl who took 2.4 g propafenone and had extreme QRS complex widening and prolonged PR interval