He had a history of depression and substance abuse (cocaine). His physical examination was unremarkable, except for agitation. His baseline electrocardiogram (ECG) demonstrated a normal sinus rhythm and a QT/QTc of 484/475 milliseconds at a pulse of 58 beats per minute. The patient was given ...
pointingdevicetoidentifythebeginningandendoftheQT interval,withanaccuracylevelof5ms.Amoretechno- logicallyadvancedoptionistodisplaydigitallyrecorded ECGsonacomputerscreen,wheretheycanbemeasuredus- ingcomputer-driven,on-screencalipers.Thislatterapproach provideshigh-qualityECGdataandisrecommendedatcore laboratoriesperfor...
A, Normal sinus rhythm; the Bazett formula is used to correct the QT interval for the heart rate. B, Atrial fibrillation; QT interval is calculated by taking the average of QT intervals with shortest and longest preceding R-R intervals. Pharmacokinetic Interactions With Selected QT-Prolonging ...
The exclusion of electrocardiograms (ECGs) showing rapid HR changes influences the level of a drug-induced QT prolongation. Continuous 12-lead ECG-Holter monitoring was performed in 31 healthy subjects. Using the "bin" method, we evaluated moxifloxacin effects on (1) QT interval duration at......
244K An electrocardiogram (ECG) records the flow of electrical current on three distinct waves. Explore the purpose of an ECG, the three wave types, and the purpose of each wave on an ECG. Related to this QuestionWhat is an ECG? What does a normal ECG indicate? What does the EKG mea...
Fill in the blank: The lowest ventricular volume is called the. Which means the QT interval on the normal ECG? a. ventricular depolarization. b. action potential of ventricular cardiomyocytes. c. action potential of SA node's pacemakers. d. action potential of atrial cardiomyocytes. ...
AP durations were within the range of the normal human electrocardiographic QT interval, and APs showed expected sensitivity to multiple drugs (tetrodotoxin, ... J Ma,L Guo,SJ Fiene,... - 《Am J Physiol Heart Circ Physiol》 被引量: 632发表: 2011年 Effect of Statin Withdrawal on Frequency...
The debate on the effect of heart rate changes on QRS duration in normal subjects is not yet fully clarified. The concomitant release of an original research article together with two editorials from the reviewers perfectly illustrates the current dilemma. In a previous issue of the journal, Mason...
What occurs in the heart during the Q-T interval? Electrocardiography: A normal electrogram or ECG is composed of a P-R interval and the Q-T interval and it is composed of three types of waves- a P waves, a QRS wave(complex), and a T-wave. ...
Answer to: How does the ECG vary and what is occurring during these conditions: junctional rhythm, second degree heart block and ventricular...