Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 24 for “"T wave"”.
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Ventricular fibrillation and fluctuations in the T-wave
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1984.
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The effects of hypocapnia on cardiac electrical activity and heart function and its relevance to the diagnosis of coronary artery disease
… subjects causes a significant increase in T wave amplitude (increase of up to 0.09 ± 0.02mV, P < 0.01) in the anteroseptal leads (V\({_1-3}\)) of 18 normal subjects but these changes do not exceed the clinical thresholds for hyperacute T wave amplitudes. Hypocapnia did not cause any other …
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The relationship between repolarisation alternans and the production of ventricular arrhythmia in heart failure
Microvolt T-wave alternans is thought to predict the risk of ventricular arrhythmias in patients with heart disease, although recent clinical studies have conflicting results. Understanding the cellular basis for alternans may not only inform more effective utilisation of the clinical test, but …
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Association of adverse cardiovascular outcomes with weighted morphologic variability following non-ST-elevation acute coronary syndromes
… heart rate turbulence, deceleration capacity, T-wave altemans, and morphologic variability have been used to identify patients at an increased risk of recurrent myocardial infarctions and cardiovascular death. In this work, we develop a new ECG-based measure for patient risk stratification called …
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Risk stratification of ICU patients using arterial blood pressure waveforms
… methods of risk stratification such as T wave Alterans, Morphological Variability, and Heart Rate Variability extract prognostic information from the electrocardiograph. However, there is still a wealth of data collected from ICU patients and left unused every year that can augment …
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Arrhythmia mechanisms in acute ischaemia and chronic infarction in rabbit heart
… vs 8.8±1.4ms) were observed during occlusion. T-wave alternans behaviour was observed frequently during local ischaemia and associated with alternans of optical action potentials (OAPs) in the ischaemic border zone (BZ) and in ischaemic zone (IZ). T-wave alternans amplitude was not maintained …
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Acute endomyocardial disease in infants and children : the relationship between acute myocarditis and endocardial fibroelastosis
… radiological cardiomegaly (CTR > 0.55), and ST/T wave changes on electrocardiogram (ECG). Acute EMD was confirmed in all 20 patients who came to autopsy. A further 17 patients with insufficient clinical data had EMD at post-mortem.
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A comprehensive assessment of variations in electrocardiogram morphology in risk assessment of cardiovascular death post-acute coronary syndrome
… heart rate turbulence, deceleration capacity, T-wave alternans, and morphologic variability. This thesis introduces new ECG-based metrics that can be used to risk-stratify post-ACS patients for future cardiovascular death and evaluates the clinical utility of the existing electrocardiogram based …
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The prevalence, profile, and prognosis of heart failure with preserved ejection fraction: A South African tertiary hospital experience
… (ECG) abnormalities included abnormal T wave inversion (38.1%), left ventricular hypertrophy (LVH) (16.7%) and left bundle branch block (LBBB) (11.9%). Atrial fibrillation (2.4%) and atrial flutter (2.4%) were uncommon. The main echocardiographic abnormalities were concentric LVH (81.0%), …
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Ethnic differences in Cardiac Adaptation to Exercise
… (12 to 13mm) compared with none of the FWA. T wave inversions (TWI) were present in 82.7% of HCM patients, 22.8% MBAs, 14% FBAs, 10.1% BCs, 3.7% MWA and 2% FWA (P<0.001). The major determinant of TWI in healthy subjects was black ethnicity. In BAs, TWI were confined predominately to the …
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Normal and abnormal findings from exercise stress ECG vs. post-exercise echocardiography studies in a series of hypertensive and normotensive individuals
… heart disease; ECG evidence of abnormal Q waves, left ventricular hypertrophy (LVH) with abnormal ST/T wave pattern, or left bundle branch block (LBBB); medications that would alter blood pressure responses or ECG interpretation; technically uninterpretable records; or failure to attain 85% …
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The Pattern of Ventricular Repolarization during Therapeutic Hypothermia
… The interval from the peak to the end of the T wave (TpTe) indicates myocardial transmural dispersion of repolarization (TDR) and increased TDR may create electrophysiological conditions for reentry. We investigate the effect of TH on the pattern of ventricular repolarization including the QTc …
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Electrocardiographic predictors of clinical outcome in ST-elevation myocardial infarction
… and morphology, dynamics of ST-segment and T-wave alternans (TWA) were calculated, and myocardial area at risk (MaR) and infarct size (IS) were assessed. Predictors and prognostic impact of early VF in STEMI was assessed in a register-based study of 1,718 consecutive patients admitted for …
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Earthquake Processes Along Oceanic Transform Faults
… the integration of hydroacoustic observations (T-waves). Oceanic transform faults are a key plate boundary structure, yet their rupture processes and mechanical properties remain less understood than those of continental faults. This work aims to address these gaps by combining observations along …
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Athletes heart and exercise related sudden cardiac death: Across the age span
… a non-dilated LV cavity and associated deep T-wave inversion that could have been consistent with HCM. However, none of the 3 athletes had any other phenotypic features of HCM on further non-invasive testing and none had first-degree relatives with features of HCM. In conclusion, the prevalence …
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The Impact of Prolonged Strenuous Exercise on Right Ventricular Structure and Function: Insights from Novel Echocardiography and Electrocardiography
… response was observed with respect to T wave changes with 50% of right-sided ECGs demonstrating a significant change pre to post-race. The laboratory based study in Chapter 6 established the most appropriate technique with respect to reliability, feasibility and appropriate absolute …
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Normal and Abnormal Findings from Exercise Stress ECG, Post-Exercise Echocardiography and Angiography Studies in a Series of Hypertensive and Normotensive Individuals
… heart disease; ECG evidence of abnormal Q waves, left ventricular hypertrophy (LVH) with abnormal ST/T wave pattern, or left bundle branch block (LBBB); medications that would alter blood pressure responses or ECG interpretation, technically uninterpretable records; or failure to attain 85% …
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Spectrum of sub-clinical cardiovascular diseases among adult patients with diabetes in out-patient clinic at the University Teaching Hospital in Zambia
… commonest cardiac lesion on ECG and ECHO was T wave abnormality (17.3%) and impaired diastolic dysfunction (49%) respectively with concentric left ventricular hypertrophy being commonly found on both tools (7.2% and 35.4% respectively). Hypokinesia was noted in 5% of patients. Hypertension was …
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THE EFFECT OF PHYSICAL GROWTH, BIOLOGICAL MATURATION AND ETHNICITY ON CARDIAC PRE-PARTICIPATION SCREENING IN MALE PAEDIATRIC ATHLETES
… age (by radiological X-ray) assessment to T-wave inversion (TWI) interpretation on the paediatric athletes ECG. TWI confined to V1–V3 was predicted by black ethnicity and biological age <16 years, but not chronological age <16 years. Secondly, biological age outperformed chronological age …
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Determinants of left ventricular mass as measured by Doppler echocardiography in pre-adolescents
… measurements were taken at the peak of the T-wave of the electrocardiogram. Each measurement was taken three to five times before averaging. Average values were used to calculate cardiac mass using the following equation (Deveraux et al. 1986). Weekly physical activity metabolic equivalent was …
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