When does the PR interval increase in men?
PR interval also increased with age in both sexes. Men aged 30–39, 40–49, and 50–59 years had the mean PR intervals of 158, 160, and 161 ms, and women 150, 152, and 158 ms, respectively. Baseline characteristics of the participants are presented in Table 1.
Why was a 10 ms PR interval used?
Paper speed 50 mm/s was used to ensure sufficient precision of the measurements, and given the resolution of clinical ECGs and the dynamic nature of the PR interval, measurements were recorded at 10 ms intervals.
How are hrs and CIS calculated for prolonged PR?
Hazard ratios (HRs) and 95% confidence intervals (CIs) for death and hospitalizations were calculated using the Cox proportional hazards model. Main endpoints were all-cause and cardiovascular mortality, and SCD. First, analyses were done with prolonged PR defined as PR >200 ms.
What are the prognostic significance of prolonged PR interval?
Recently, findings from the Framingham Heart Study population have challenged this long-standing perception by demonstrating, that prolonged PR interval is associated with an increased risk of atrial fibrillation (AF) and pacemaker implantation.
How long is too long in the QTc interval?
Table 1 Finding Points ECG Corrected QT interval (QTc by Bazett’ 450 ms (in males) 1 460–470 ms 2
What’s the upper 98th percentile limit for men?
One reference source 20 reports the upper 98th percentile normal limit as approximately 0.3 mV in white men less than 40 years of age (up to 0.33 mV in the 24- to 29-year age group) and approximately 0.25 mV in white men 40 years old and older.
What does the QT interval mean in an ECG?
The QT interval is a fluid measurement that is influenced by the physiological and metabolic state of the patient at the time of the ECG. Owing to multiple variables interacting at any given time, patients may have different QT intervals during subsequent ECG examinations.