scholarly journals THE REFRACTORY PERIOD OF THE NORMALLY-BEATING DOG'S AURICLE; WITH A NOTE ON THE OCCURRENCE OF AURICULAR FIBRILLATION FOLLOWING A SINGLE STIMULUS

1930 ◽  
Vol 51 (3) ◽  
pp. 357-367 ◽  
Author(s):  
E. Cowles Andrus ◽  
Edward P. Carter ◽  
Keyword(s):  
Sinus Rhythm ◽  
Refractory Period ◽  
Vagal Stimulation ◽  
Normal Sinus Rhythm ◽  
Accurate Determination ◽  
Single Stimulus ◽  
Action Current ◽  
Normal Sinus ◽  
Stimulation Of

1. A method is described for determining the refractory period of the dog's auricle during the normal sinus rhythm. The advantages of the method are: (a) The total stimulating effects of repeated induction shocks are avoided. (b) The action current is recorded from a point one millimeter or less from the point of stimulation. (c) Alterations in the spontaneous rate of the auricle do not interfere with the accurate determination of the refractory period. 2. The values obtained for the normal refractory period and the changes produced by atropine and by stimulation of the vagus agree closely with those of previous observers. 3. The automatic features of the method make possible the determination of the refractory period under adrenalin. This drug brings about a distinct shortening of the refractory period but less than that produced by stimulation of the vagus. 4. During vagal stimulation a single induction shock, introduced soon after the end of the refractory period, frequently produces auricular fibrillation. The cause of this irregularity is discussed and its relation to clinical auricular fibrillation is suggested.

scholarly journals Determination of Sample Entropy and Fuzzy Measure Entropy Parameters for Distinguishing Congestive Heart Failure from Normal Sinus Rhythm Subjects

Entropy ◽  
2015 ◽  
Vol 17 (12) ◽  
pp. 6270-6288 ◽  
Author(s):  
Lina Zhao ◽  
Shoushui Wei ◽  
Chengqiu Zhang ◽  
Yatao Zhang ◽  
Xinge Jiang ◽  
...  
Keyword(s):  
Heart Failure ◽  
Congestive Heart Failure ◽  
Sinus Rhythm ◽  
Normal Sinus Rhythm ◽  
Sample Entropy ◽  
Fuzzy Measure ◽  
Normal Sinus ◽  
Measure Entropy

Ventricular Tachycardia and Ventricular Fibrillation Analysis Based on Jensen-Shannon Divergence Analysis

2013 ◽  
Vol 321-324 ◽  
pp. 712-715
Author(s):  
Zheng Zhong Zheng ◽  
Jun Chang Zhao ◽  
Jun Wang
Keyword(s):  
Ventricular Tachycardia ◽  
Ventricular Fibrillation ◽  
Sinus Rhythm ◽  
Complexity Analysis ◽  
Heart Function ◽  
Normal Sinus Rhythm ◽  
Normal Sinus ◽  
Practice Of Medicine ◽  
Cardiac Sudden Death ◽  
Jensen Shannon Divergence

t is an important method for using electrocardiogram (ECG) to detect and diagnose heart function in clinical practice of medicine. Ventricular tachycardia (VT) and ventricular fibrillation (VF) are serious threats for peoples lives, they often bring about cardiac sudden death. In this paper, the complexity analysis method based on Jensen-Shannon Divergence was used to calculate the complexity of the normal sinus rhythm signals, VT, VF. The study found that the VF was highest, followed by that of VT, and that of normal sinus rhythm signals was minimum. The result can be used to assisted clinical diagnosis.

scholarly journals An Atrial Fibrillation with Normal Limits using Signal Processing- A Review

2018 ◽  
Vol 7 (2.24) ◽  
pp. 453
Author(s):  
S. Sathish ◽  
K Mohanasundaram
Keyword(s):  
Atrial Fibrillation ◽  
Sinus Rhythm ◽  
Normal Sinus Rhythm ◽  
P Wave ◽  
Wave Duration ◽  
Normal Limits ◽  
Normal Sinus ◽  
P Wave Duration ◽  
Standard Lead ◽  
Wave Morphology

Atrial fibrillation is an irregular heartbeat (arrhythmia) that can lead to the stroke, blood clots, heart failure and other heart related complications. This causes the symptoms like rapid and irregular heartbeat, fluttering, shortness of breath etc. In India for every around 4000 people eight of them are suffering from Atrial Fibrillation. P-wave Morphology.  Abnormality of P-wave (Atrial ECG components) seen during sinus rhythm are associated with Atrial fibrillation. P-wave duration is the best predictor of preoperative atrial fibrillation. but the small amplitudes of atrial ECG and its gradual increase from isometric line create difficulties in defining the onset of P wave in the Standard Lead Limb system (SLL).Studies shows that prolonged P-wave have duration in patients (PAF) In this Study, a Modified Lead Limb (MLL) which solves the practical difficulties in analyzing the P-ta interval for both in healthy subjects and Atrial Fibrillation patients. P-Ta wave interval and P-wave duration can be estimated with following proposed steps which is applicable for both filtered and unfiltered atrial ECG components which follows as the clinical database trials. For the same the p-wave fibrillated signals that escalates the diagnosis follows by providing minimal energy to recurrent into a normal sinus rhythm.  

scholarly journals TREMORS MIMICKING ATRIAL FLUTTER IN AN ELDERLY LADY

2022 ◽  
Vol 54 (4) ◽  
pp. 370-372
Author(s):  
Intisar Ahmed ◽  
Hunaina Shahab ◽  
Aamir Hameed Khan
Keyword(s):  
Chest Pain ◽  
Sinus Rhythm ◽  
Hospital Stay ◽  
Atrial Flutter ◽  
Normal Sinus Rhythm ◽  
Correct Diagnosis ◽  
Normal Sinus ◽  
Inappropriate Treatment ◽  
History Of

A 77 -year-old lady with history of hypertension and Parkinson`s disease was admitted with cough and fever and diagnosed as pneumonia. On second day of admission, she started having chest pain, initial ECG was interpreted as atrial flutter. When her ECG was reviewed by a cardiologist, ECG features were found to be consistent with artifacts due to tremors. A repeat 12 leads ECG clearly demonstrated normal sinus rhythm and the patient remained completely asymptomatic throughout the hospital stay. Tremor induced artifacts can be mistaken for arrhythmias. Correct diagnosis is important, in order to avoid inappropriate treatment and unnecessary interventions.

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