During the second stage, the mother's position does not affect duration or mode of delivery or maternal or neonatal outcome in deliveries without epidural anesthesia (7). Also, the pushing technique (spontaneous versus directed and delayed versus immediate) does not affect the mode of del...
During sinus rhythm, the surface ECG showed a normal PR interval (161 ms) and QRS complex duration (86 ms) with no evidence of ventricular pre-excitation (Fig. 1). An electrophysiological study was performed using standard electrode catheters in the high right ...
Fill in the blanks. The normal duration of the PR interval is ___ to ___ second, or ___ to ___ small horizontal squares. Fill in the blank. Each gas in a mixture will ___ contribute to the total pressure created by the mixture of...
Her baseline 12-lead electrocardiogram showed normal sinus rhythm with normal PR interval and preexisting right bundle branch block with QRS duration of 138 milliseconds. Profound Sinoatrial Arrest Associated with Ibrutinib (14) identified normal sinus rhythm in 76%, sinus tachycardia in 9%, sinus br...
An apparently normal ECG is defined by the following [30]: 1) heart rate between 55 and 100 bpm; 2) presence of P waves in all leads, with normal morphology; 3) presence of a QRS complex following each P wave; 4) PR interval between 0.12 to 0.20 seconds; 5) QRS duration ≤ 0.12...
In normal sinus rhythm, what does the P-wave, the PR interval, QRS complex, and QT interval reflect?ECG:An ECG, or electrocardiogram, is an electrical readout of the heart which measures the electrical output of all heart chambers during cardiac cycles. Th...
Objective:The aim of this study was to assess the prevalence of systolic dyssynchrony of the LV walls in patients of HF with a normal QRS duration by Doppler tissue imaging(DTI). 目的:应用多普勒组织显像(DTI)评估严重心衰而QRS间期正常的患者左室收缩不同步的发生率。2...
of the P:E2ratio as PL was ≥1.2 for not achieving pregnancy, which had a sensitivity of 75.0%, a specificity of 32.0%, a positive predictive value of 37.0%, and a negative predictive value of 71.0%. The area under the ROC curve was 0.534 (95% confidence interval [CI], 0.456–0.613...
Modern medicine emphasizes the concept of homeostasis, constancy of the intern milieu. Accordingly, it is assumed that biological functions and processes are relatively stable during the 24 h and other time periods and that the exacerbation of disease an
The results of this study convey how gender determines changes in all the ECG parameters analysed, except for the P wave duration and the PR interval. As regards age, the results identify differences across all the age groups. Declaration of Competing Interest None. Acknowledgments We would thank...