Electrocardiographic T wave abnormalities

Lin, Weiqin; Sg, Teo; Poh, Kian Keong

doi:10.11622/smedj.2013218

Cited by 7 publications

(10 citation statements)

References 2 publications

(2 reference statements)

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“…During phase 3, there is closure of the calcium channels, while the potassium channels remain open, resulting in rapid loss of positive charge from the cardiomyocytes and restoration of the resting membrane potential (Issa et al 2009). As such, the configuration of the T wave is dependent on the spatial-temporal characteristics of ventricular repolarization (Lin et al 2013). The T-wave in cats can be positive, negative, or biphasic (Tilley & Burtinick 1999).…”

Section: Discussionmentioning

confidence: 99%

Sedative and electrocardiographic effects of low dose dexmedetomidine in healthy cats

et al. 2019

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In feline veterinary practice sedation is often needed to perform diagnostic or minimally invasive procedures, minimize stress, and facilitate handling. The mortality rate of cats undergoing sedation is significantly higher than dogs, so it is fundamental that the sedatives provide good cardiovascular stability. Dexmedetomidine (DEX) is an α2-adrenergic receptor agonist utilized in cats to provide sedation and analgesia, although studies have been utilized high doses, and markedly hemodynamic impairments were reported. The aim of this study was to prospectively investigate how the sedative and electrocardiographic effects of a low dose of DEX performing in cats. Eleven healthy cats were recruited; baseline sedative score, systolic arterial pressure, electrocardiography, and vasovagal tonus index (VVTI) were assessed, and repeated after ten minutes of DEX 5μg/kg intramuscularly (IM). A smooth sedation was noticed, and emesis and sialorrhea were common adverse effects, observed on average seven minutes after IM injection. Furthermore, electrocardiographic effects of a low dose of DEX mainly include decreases on heart rate, and increases on T-wave amplitude. The augmentation on VVTI and appearance of respiratory sinus arrhythmia, as well as sinus bradycardia in some cats, suggesting that DEX enhances parasympathetic tonus in healthy cats, and therefore will be best avoid in patients at risk for bradycardia.

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Section: Discussionmentioning

confidence: 99%

Sedative and electrocardiographic effects of low dose dexmedetomidine in healthy cats

et al. 2019

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“…The pattern of values, which was extracted as features (T-amp and T-right slope from lead II, V3, V4, V5, and V6), showed well-known patterns. It is known that the amplitude of T wave is maximal in lead V3 [18]. In addition, T wave in the precordial leads (<10 mm or <1 mV) is usually greater than that in the limb (<5 mm or 0.5 mV) leads [18].…”

Section: Discussionmentioning

confidence: 99%

“…It is known that the amplitude of T wave is maximal in lead V3 [18]. In addition, T wave in the precordial leads (<10 mm or <1 mV) is usually greater than that in the limb (<5 mm or 0.5 mV) leads [18]. In our results, only less than 2% in the total patient group (6 in lead II, 5 in lead V3, 5 in lead V4, 1 in lead V5, and 0 in lead V6 among 330 ECGs) and the normal ECG subgroup (2 in lead II, 4 in lead V3, 1 in lead V4, 0 in lead V5, and 0 in lead V6 among 231 normal ECGs) exceeded 0.5 mV in the limb lead or 1 mV in the precordial leads, respectively.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Evaluation of the Relationship between T-Wave-Based Features and Serum Potassium Level in Real-World Clinical Practice

Yoon

Lim

Jeong

et al. 2018

BioMed Research International

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Background Proper management of hyperkalemia that leads to fatal cardiac arrhythmia has become more important because of the increased prevalence of hyperkalemia-prone diseases. Although T-wave changes in hyperkalemia are well known, their usefulness is debatable. We evaluated how well T-wave-based features of electrocardiograms (ECGs) are correlated with estimated serum potassium levels using ECG data from real-world clinical practice. Methods We collected ECGs from a local ECG repository (MUSE™) from 1994 to 2017 and extracted the ECG waveforms. Of about 1 million reports, 124,238 were conducted within 5 minutes before or after blood collection for serum potassium estimation. We randomly selected 500 ECGs and two evaluators measured the amplitude (T-amp) and right slope of the T-wave (T-right slope) on five lead waveforms (V3, V4, V5, V6, and II). Linear correlations of T-amp, T-right slope, and their normalized feature (T-norm) with serum potassium levels were evaluated using Pearson correlation coefficient analysis. Results Pearson correlation coefficients for T-wave-based features with serum potassium between the two evaluators were 0.99 for T-amp and 0.97 for T-right slope. The coefficient for the association between T-amp, T-right slope, and T-norm, and serum potassium ranged from -0.22 to 0.02. In the normal ECG subgroup (normal ECG or otherwise normal ECG), there was no correlation between T-wave-based features and serum potassium level. Conclusions T-wave-based features were not correlated with serum potassium level, and their use in real clinical practice is currently limited.

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“…An ECG case series also reports that PE is one of the causes of T wave abnormalities. (11) Another study showed that the most common finding in confirmed massive PE was T wave inversions in the precordial leads with an earlier onset in the more severe cases. (12) This was observed in Case 2.…”

Section: Ecg Featuresmentioning

confidence: 99%

Electrocardiographic findings in pulmonary embolism

Boey

Teo

Poh

2015

smedj

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E l e c t r o c a r d i o g r a p h y S e r i e s 5331 Department of Cardiology, National University Heart Centre, National University Health System, 2 Raffles Heart Centre, Raffles Hospital, 3 CASE 1 CLINICAL PRESENTATIONA 55-year-old woman with a history of hypertension and a recent haemorrhagic stroke was admitted with an acute onset of shortness of breath for a duration of one day. She also reported an episode of near syncope while engaging in physiotherapy. At the emergency department, her initial vital parameters included blood pressure of 139/97 mmHg, heart rate of 99 beats per minute (bpm) and oxygen saturation of 89% on room air. Other than being tachypnoeic (25 per minute), the patient had normal heart and breath sounds. Electrocardiography (ECG) was performed (Fig. 1).

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Electrocardiographic T wave abnormalities

Cited by 7 publications

References 2 publications

Sedative and electrocardiographic effects of low dose dexmedetomidine in healthy cats

Sedative and electrocardiographic effects of low dose dexmedetomidine in healthy cats

Quantitative Evaluation of the Relationship between T-Wave-Based Features and Serum Potassium Level in Real-World Clinical Practice

Electrocardiographic findings in pulmonary embolism

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