scholarly journals Electrocardiographic manifestations in severe hypokalemia

2018 ◽  
Vol 48 (1) ◽  
pp. 030006051881105 ◽  
Author(s):  
Xiqiang Wang ◽  
Dan Han ◽  
Guoliang Li
Keyword(s):  
P Wave ◽  
Dynamic Changes ◽  
T Wave ◽  
Electrolyte Disturbances ◽  
St Segment ◽  
Pr Interval ◽  
Wave Morphology ◽  
Life Threatening

Hypokalemia is one of the most common electrolyte disturbances in the clinic and it can increase the risk of life-threatening arrhythmias. Electrocardiographic characteristics associated with hypokalemia include dynamic changes in T-wave morphology, ST-segment depression, and U waves, which are often best seen in the mid-precordial leads (V2–V4). The PR interval can also be prolonged along with an increase in the amplitude of the P wave. We report a case of a patient with hypokalemia (1.31 mmol/L) who showed typical electrocardiographic characteristics of hypokalemia.

Changes in the Electrocardiogram and Achilles Reflex Test during Treatment of Hypothyroidism

1969 ◽  
Vol 14 (2) ◽  
pp. 59-63 ◽  
Author(s):  
R. J. Weir ◽  
J. A. Young ◽  
J. B. McGuinness
Keyword(s):  
P Wave ◽  
Qrs Complex ◽  
T Wave ◽  
St Segment ◽  
Pr Interval ◽  
Myocardial Muscle ◽  
Reflex Time

In 10 patients with hypothyroidism, the electrocardiogram and Achilles reflex test have been recorded before and during treatment with l-thyroxine sodium. Aspects of the electrocardiogram affected by hypothyroidism are the rate, duration of PR interval, height of P-wave, of QRS complex and of T-wave and the ST segment. Each of these improved with therapy, the earliest and most sensitive change being the height of the QRS complex. The Achilles reflex time as recorded by the photomotograph also showed a parallel decrease with therapy but this is considered to be less reliable as an isolated test. The prolongation of the PR interval is briefly discussed and a correlation between the changes in skeletal and myocardial muscle is suggested.

Ventricular coupling induced by anodal or cathodal polarization during continuous direct currents in dog ventricle

1958 ◽  
Vol 196 (1) ◽  
pp. 209-212 ◽  
Author(s):  
Sheppard M. Walker
Keyword(s):  
Direct Current ◽  
Vagal Stimulation ◽  
Ectopic Beat ◽  
T Wave ◽  
Sinus Rate ◽  
St Segment ◽  
Pr Interval ◽  
Ectopic Beats ◽  
Ventricular Beat

Ventricular ectopic beats coupled with preceding normal beats occur during the delivery of direct current when the anode or cathode is on the ventricular epicardium of the dog. These ectopic beats are induced within the T-wave or immediately thereafter during the application of threshold direct current when the anode is on the epicardium. When anodal current is begun in the ST segment of a given cycle, an ectopic beat is induced within or near the T-wave of the same cycle. When the cathode is on the epicardium, coupled ventricular ectopic beats are induced within the PR interval during the application of threshold direct current. Under these conditions marked slowing of sinus rate by vagal stimulation does not alter the interval of coupling between the ectopic beat and the preceding normal beat. Thus it is shown that the abnormal ventricular beat, falling within the PR interval, is ectopic and independent of the auricular impulse.

ECG SIGNAL GENERATION AND HEART RATE VARIABILITY SIGNAL EXTRACTION: SIGNAL PROCESSING, FEATURES DETECTION, AND THEIR CORRELATION WITH CARDIAC DISEASES

2012 ◽  
Vol 12 (04) ◽  
pp. 1240012 ◽  
Author(s):  
GOUTHAM SWAPNA ◽  
DHANJOO N. GHISTA ◽  
ROSHAN JOY MARTIS ◽  
ALVIN P. C. ANG ◽  
SUBBHURAAM VINITHA SREE
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Sinus Bradycardia ◽  
Premature Ventricular Contraction ◽  
P Wave ◽  
Ecg Signal ◽  
Qrs Complex ◽  
T Wave ◽  
St Segment ◽  
Cardiac Disorders

The sum total of millions of cardiac cell depolarization potentials can be represented by an electrocardiogram (ECG). Inspection of the P–QRS–T wave allows for the identification of the cardiac bioelectrical health and disorders of a subject. In order to extract the important features of the ECG signal, the detection of the P wave, QRS complex, and ST segment is essential. Therefore, abnormalities of these ECG parameters are associated with cardiac disorders. In this work, an introduction to the genesis of the ECG is given, followed by a depiction of some abnormal ECG patterns and rhythms (associated with P–QRS–T wave parameters), which have come to be empirically correlated with cardiac disorders (such as sinus bradycardia, premature ventricular contraction, bundle-branch block, atrial flutter, and atrial fibrillation). We employed algorithms for ECG pattern analysis, for the accurate detection of the P wave, QRS complex, and ST segment of the ECG signal. We then catagorited and tabulated these cardiac disorders in terms of heart rate, PR interval, QRS width, and P wave amplitude. Finally, we discussed the characteristics and different methods (and their measures) of analyting the heart rate variability (HRV) signal, derived from the ECG waveform. The HRV signals are characterised in terms of these measures, then fed into classifiers for grouping into categories (for normal subjects and for disorders such as cardiac disorders and diabetes) for carrying out diagnosis.

The Association between T-Wave Morphology and Life-Threatening Ventricular Tachyarrhythmias in Patients with Congestive Heart Failure

2009 ◽  
Vol 32 (9) ◽  
pp. 1173-1177 ◽  
Author(s):  
YEN-HUNG LIN ◽  
LIAN-YU LIN ◽  
YING-SHREN CHEN ◽  
HUI-CHUN HUANG ◽  
JEN-KUANG LEE ◽  
...  
Keyword(s):  
Heart Failure ◽  
Congestive Heart Failure ◽  
Ventricular Tachyarrhythmias ◽  
T Wave ◽  
Wave Morphology ◽  
Life Threatening

scholarly journals Electrocardiographic parameters of the American Miniature Horse: influence of age and sex

2016 ◽  
Vol 36 (6) ◽  
pp. 551-558
Author(s):  
Bianca P. Santarosa ◽  
Maria L.G. Lourenço ◽  
Gabriela N. Dantas ◽  
Carla M.V. Ulian ◽  
Marta C.T. Heckler ◽  
...  
Keyword(s):  
Age Groups ◽  
Frontal Plane ◽  
The Elderly ◽  
P Wave ◽  
Sinus Arrhythmia ◽  
T Wave ◽  
St Segment ◽  
Electrocardiographic Parameters ◽  
Electrocardiogram Ecg ◽  
Age And Sex

Abstract: The veterinary cardiology has growing importance in equine medicine. There are studies of standardization of electrocardiographic parameters of many races, according to their stature and ability. However, no studies are in the literature with the American Miniature Horse. To evaluate the electrocardiogram (ECG) tracing configuration of this breed at rest and to verify the influence of age and sex on ECG parameters, 203 horses including 143 females and 60 males were divided into four age groups (foals, yearlings, adults and elderly). Electrocardiographic parameters were performed by computerized electrocardiogram (TEB), and the parameters were evaluated in six leads of frontal plane (Lead I, II, III, aVR, aVL and aVF) and base-apex (BA). Heart rates (HR) decreased with increasing age were higher in males than in females. Sinus tachycardia followed by sinus arrhythmia was dominant in both sexes. The cardiac axis was higher in males and ranged between 120° and 150° for foals, 30° and 60° for yearlings and adults, and 60° and 90° for the elderly. The P wave was bifid in several animals. The P-wave amplitude and T-wave duration from lead II and BA were larger in males than in females. The majority of the animals exhibited ST segment depression and a negative T-wave. The most common QRS complex morphology was Qr. Differences were observed between the electrocardiographic tracings of males and females, and age influenced the ECG parameters. Therefore, this study established the ECG patterns for the American Miniature Horse breed and could be used to determine the influence of age and sex on several of the studied variables.

scholarly journals Delineation of electrocardiogram morphologies by using discrete wavelet transforms

2021 ◽  
Vol 22 (1) ◽  
pp. 159
Author(s):  
Annisa Darmawahyuni ◽  
Siti Nurmaini ◽  
Hanif Habibie Supriansyah ◽  
Muhammad Irham Rizki Fauzi ◽  
Muhammad Naufal Rachmatullah ◽  
...  
Keyword(s):  
Wavelet Transforms ◽  
Noise Removal ◽  
P Wave ◽  
Discrete Wavelet ◽  
Wave Localization ◽  
T Wave ◽  
Wave Morphology ◽  
Cardiac Disorders ◽  
Non Stationary Signal ◽  
Different Characteristics

<span>The accuracy of electrocardiogram (ECG) delineation can affect the precise diagnose for cardiac disorders interpretation. Some nonideal ECG presentation can make a false decision in precision medicine. Besides, the physiological variation of heart rate and different characteristics of the different ECG waves in terms of shape, frequency, amplitude, and duration is also affected. <span>This paper proposes a discrete wavelet transform (DWT), non-stationary signal analysis for noise removal, and onset-offset of PQRST feature extraction. A well-known database from Physionet: QT database (QTDB) is used to validate the DWT function for detecting the onset and offset of P-wave, QRS-complex, and T-wave localization. From the results, P-peak detection gets the highest result that achieves 2.19 and 13.62 milliseconds of mean error and standard deviation, respectively. In contrast, Toff has obtained the highest error value due to differences in the T-wave morphology. It can be affected by inverted o</span>r biphasic T-waves and others.</span>

scholarly journals Electrocardiographic recognition of life-threatening hyperkalaemia: the hyperkalaemic Brugada sign

JRSM Open ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 205427041983424
Author(s):  
Holly McNeill ◽  
Chris Isles
Keyword(s):  
Calcium Gluconate ◽  
Blood Chemistry ◽  
St Segment Elevation ◽  
T Wave ◽  
St Segment ◽  
Life Threatening

Lesson Consider life-threatening hyperkalaemia if the ECG shows high take-off with coved ST segment elevation and negative T wave in lead V1 superimposed on other ECG signs of hyperkalaemia and treat with calcium gluconate while waiting for blood chemistry results.

scholarly journals Electrocardiogram Changes with Acute Alcohol Intoxication: A Systematic Review

2018 ◽  
Vol 12 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Hitesh Raheja ◽  
Vinod Namana ◽  
Kirti Chopra ◽  
Ankur Sinha ◽  
Sushilkumar Satish Gupta ◽  
...  
Keyword(s):  
Cardiac Arrhythmias ◽  
Alcohol Intoxication ◽  
P Wave ◽  
Acute Alcohol Intoxication ◽  
Qrs Complex ◽  
Qtc Prolongation ◽  
Ecg Changes ◽  
T Wave ◽  
St Segment ◽  
Electrocardiogram Ecg

Background: Acute alcohol intoxication has been associated with cardiac arrhythmias but the electrocardiogram (ECG) changes associated with acute alcohol intoxication are not well defined in the literature. Objective: Highlight the best evidence regarding the ECG changes associated with acute alcohol intoxication in otherwise healthy patients and the pathophysiology of the changes. Methods: A literature search was carried out; 4 studies relating to ECG changes with acute alcohol intoxication were included in this review. Results: Of the total 141 patients included in the review, 90 (63.8%) patients had P-wave prolongation, 80 (56%) patients had QTc prolongation, 19 (13.5%) patients developed T-wave abnormalities, 10 (7%) patients had QRS complex prolongation, 3 (2.12%) patients developed ST-segment depressions. Conclusion: The most common ECG changes associated with acute alcohol intoxication are (in decreasing order of frequency) P-wave and QTc prolongation, followed by T-wave abnormalities and QRS complex prolongation. Mostly, these changes are completely reversible.

scholarly journals Hyperkalemia Induced Brugada Phenocopy: A Rare ECG Manifestation

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Muhammad Ameen ◽  
Ghulam Akbar ◽  
Naeem Abbas ◽  
Ghazi Mirrani
Keyword(s):  
Ion Channels ◽  
Ventricular Arrhythmias ◽  
Cardiac Conduction ◽  
St Segment Elevation ◽  
Electrolyte Disturbances ◽  
Cardiac Ion Channels ◽  
St Segment ◽  
Life Threatening ◽  
Severe Hyperkalemia ◽  
Brugada Pattern

Brugada syndrome (BrS) is an inherited disorder of cardiac ion channels characterized by peculiar ECG findings predisposing individuals to ventricular arrhythmias, syncope, and sudden cardiac death (SCD). Various electrolyte disturbances and ion channels blocking drugs could also provoke BrS ECG findings without genetic BrS. Clinical differentiation and recognition are essential for guiding the legitimate action. Hyperkalemia is well known to cause a wide variety of ECG manifestations. Severe hyperkalemia can even cause life threatening ventricular arrhythmias and cardiac conduction abnormalities. Most common ECG findings include peaked tall T waves with short PR interval and wide QRS complex. Since it is very commonly encountered disorder, physicians need to be aware of even its rare ECG manifestations, which include ST segment elevation and Brugada pattern ECG (BrP). We are adding a case to the limited literature about hyperkalemia induced reversible Brugada pattern ECG changes.

scholarly journals ELECTROCARDIOGRAM IMAGES OF PIGS (Sus scrofa) ANESTHETIZED WITH A COMBINATION OF KETAMINE-MEDETOMIDIN AND KETAMINE-ACEPROMAZIN

2021 ◽  
Vol 14 (4) ◽  
Author(s):  
Jessica Anggun Safitri ◽  
Gunanti Gunanti ◽  
Deni Noviana ◽  
Sus Derthi Widhyari
Keyword(s):  
Heart Rate ◽  
Qt Interval ◽  
Heart Rhythm ◽  
Front Wall ◽  
Average Heart Rate ◽  
T Wave ◽  
Group I ◽  
St Segment ◽  
Pr Interval ◽  
Ecg Leads

This study aims to evaluate and compare the effects of the combination of ketamine-medetomidine and ketamine-acepromazine anesthesia on pig electrocardiogram (ECG) images. The study was conducted to see the ECG Leads II in six pigs which were divided into two groups. Group I (K1) was given a combination of ketamine (10 mg/kg BW) and medetomidine (0.08 mg/kg BW), while Group II (K2) was given a combination of ketamine (22 mg/kg BW) and acepromazine (1.1 mg/kg BW) intramuscularly. ECG recording was performed after the pigs were anesthetized at the surgical stage by attaching the recording electrodes to the front wall of the chest, front left and right ankles, and back right and left back ankles. The ECG recording used 1 voltage (1 cm = 1mV) with a speed of 25 mm/sec. The parameters observed were heart rate frequency, heart rhythm, P duration, P amplitude, PR interval, R amplitude, QRS interval, QT interval, ST segment, T wave, and Mean Electrical Axis (MEA). Data obtained from this study were analyzed by T-test. The results showed that K1 had an average heart rate of 100 x/minute, regular heart rhythm, P duration of 0.07 sec, P amplitude of 0.27 mV, PR interval of 0.17 sec, R amplitude of 0.75 mV, QRS interval of 0.05 sec, QT interval of 0.20 sec, ST segment of 0.17sec, T wave of 0.17 mV, and MEA of 83.60°; meanwhile, K2 had an average heart rate of 122 x/minute, regular heart rhythm, P duration of 0.06 mm/sec, P amplitude of 0.23 mV, PR interval of 0.14 sec, R amplitude of 0.80 mV, QRS interval of 0.04 sec, QT interval of 0.16 sec, ST segment of 0.14 sec, T wave of 0.12 mV, and MEA of 68.60. The ketamine-medetomidine combination produced good quality of anesthetics for the cardiovascular system.

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