variousmethodsforQT-intervalmeasurementhavebeendeveloped,includingindividual-basedcorrectionsforrepolarizationduration,quantitativeassessmentofrepolar-izationmorphology,correctionforrepolarizationdynamic-ity,andanalysisofrepolarizationvariability.However,thesemethodsrequirecomputer-processeddigital-signalanalysisofelectronicallystored...
QT intervalreproducibilitytime-dependent variationdisopyramideMeasurement of the QT dispersion (the maximal interlead difference) on the surface electrocardiogram has been suggested for assessing the risk for ventricular arrhythmias and for examining drug effects and their proarrhythmic potential. The acute ...
In order to enchance the echocardiographic assessment of the size and function of the right ventricle (RV), we evaluated the measurement of the right ventricular outflow tract (RVOT) on echo- gram, and compared it with that of the aortic root (AO). Thus ultrasound examinations were performed...
Which of the following is NOT a normal QRS measurement? A) 0.20 B) 0.08 C) 0.06 D) 0.11 What occurs in the heart during the P-R interval? Fill in the blank. In the adult, sinus tachycardia is the normal physiologic response to ___. Which of the...
Age trends were apparent for the QTc interval, QRS axis, and indices of left ventricular hypertrophy. Amplitudes in the left precordial leads showed a substantial increase in the older age groups for women, but not for men. Sex-dependent differences were apparent for most ECG parameters. All ...
The Twave may actually begin at the end of the QRS complex, and virtually no ST segment may be present. This change produces a decrease in the length of the QTc interval. There is a lack of correlation QTc and serum calcium. The interval from the qt to the apex of the T wave can ...
The main strengths of this study were the determination of the optimal ALT cut-off points and the use of different measurement methods for the cumulative effects of ehALT from three perspectives (i.e., cumulative number of ehALT measurements and equally and unequally weighted cumulative effects)....
In each 30-min segment, R-peaks of the QRS-complex and SBP were detected by adaptive filtering of the ECG and BP waveforms, respec- tively. Segments containing artifacts were excluded (<5% of the data). The unevenly time-spaced R–R interval and SBP series were convolved with a boxcar ...
using irregular area and straight-line selection tools. We normalized each measurement with respect its value in the ED frame. After the heart was excised, it was cleaned and then perfusion fixed in 10% buffered formalin under end-diastolic pressure (around 15 mmHg) with valves coapted. MRI ...
Typical non-sedated mice ECG shows a J wave just after QRS complex, an almost isoelectric S-P interval and a P wave [38]. This typical ECG was observed in control mice (Fig. 3a). However, we found specific alterations in 6-month-old α-MHCMet-KO males. Anomalies consisted in the ...