The Electrocardiogram during Myocardial Infarction

1992 ◽  
Vol 3 (1) ◽  
pp. 190-202
Author(s):  
Linda K. Menzel
Keyword(s):  
Myocardial Infarction ◽  
Myocardial Ischemia ◽  
Myocardial Infarctions ◽  
Qrs Complex ◽  
Physical Assessment ◽  
T Wave ◽  
St Segment ◽  
Patient’S History

The electrocardiogram during myocardial ischemia, injury, and infarction produces classic changes in the QRS complex, ST segment, and T wave. These changes arc easily recognized and, with results of serum isoenzymes, physical assessment, and the patient’s history, aid in diagnosis. This article reviews the changes that occur on the electrocardiogram beginning with a brief review of normal depolarization and repolarization and ending with changes seen in various types of myocardial infarctions

scholarly journals Repetitive Myocardial Infarctions Secondary to Delirium Tremens

2014 ◽  
Vol 2014 ◽  
pp. 1-3
Author(s):  
David Schwartzberg ◽  
Adam Shiroff
Keyword(s):  
Myocardial Infarction ◽  
Myocardial Ischemia ◽  
Alcohol Withdrawal ◽  
Delirium Tremens ◽  
Oxygen Demand ◽  
Myocardial Infarctions ◽  
Myocardial Oxygen Demand ◽  
Significant Morbidity ◽  
St Segment ◽  
Patients Experience

Delirium tremens develops in a minority of patients undergoing acute alcohol withdrawal; however, that minority is vulnerable to significant morbidity and mortality. Historically, benzodiazepines are given intravenously to control withdrawal symptoms, although occasionally a more substantial medication is needed to prevent the devastating effects of delirium tremens, that is, propofol. We report a trauma patient who required propofol sedation for delirium tremens that was refractory to benzodiazepine treatment. Extubed prematurely, he suffered a non-ST segment myocardial infarction followed by an ST segment myocardial infarction requiring multiple interventions by cardiology. We hypothesize that his myocardial ischemia was secondary to an increased myocardial oxygen demand that occurred during his stress-induced catecholamine surge during the time he was undertreated for delirium tremens. This advocates for the use of propofol for refractory benzodiazepine treatment of delirium tremens and adds to the literature on the instability patients experience during withdrawal.

Difficulties in ECG diagnosis of myocardial infarction

1993 ◽  
Vol 74 (1) ◽  
pp. 61-62
Author(s):  
V. M. Andreev
Keyword(s):  
Myocardial Infarction ◽  
Qrs Complex ◽  
T Wave ◽  
St Segment

Until now, in the diagnosis of myocardial infarction (MI), the main importance is attached to ECG studies. In the MI focus, an ischemic zone is formed, which is characterized by a change in the repolarization process (T wave), an injury zone manifested by a displacement of the ST segment and a necrosis zone, which is expressed in a change in the QRS complex.

scholarly journals Transcutaneous pacing: a life saviour

2020 ◽  
Vol 8 (6) ◽  
pp. 2332
Author(s):  
Roly Mishra ◽  
Parna Thakkar ◽  
Hemant Mehta
Keyword(s):  
Myocardial Infarction ◽  
Cardiac Pacing ◽  
Inferior Wall ◽  
Arterial Pulse ◽  
Qrs Complex ◽  
Transient Conditions ◽  
T Wave ◽  
Successful Attempt ◽  
St Segment ◽  
Transcutaneous Pacing

 Doukky Rand colleagues acknowledged that Transcutaneous Cardiac Pacing is a temporary method of pacing which may be indicated in patients with symptoms of severe or hemodynamically unstable bradyarrhythmias. It is found to be extremely helpful in patients with reversible or transient conditions, such as digoxin toxicity and in atrioventricular block in the case of inferior wall myocardial infarction, or when transvenous pacing is not available or there are high chances of complications. Widened QRS complex indicates successful attempt followed by a distinct ST segment and broad T wave. The hemodynamic response to pacing is to be confirmed by the assessment of patient’s arterial pulse waveforms. Trancutaneous pacing is a boon to manage and treat intra op dangerous bradycardia.

scholarly journals Prediction of the Site of Coronary Artery Lesion in Acute Inferior Myocardial Infarction with Right Sided Precordial Lead (V4r)

1970 ◽  
Vol 4 (1) ◽  
pp. 46-52
Author(s):  
MS Alam ◽  
M Ullah ◽  
SU Ulabbi ◽  
MM Haque ◽  
R Uddin ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Wave Group ◽  
Precordial Lead ◽  
Inferior Myocardial Infarction ◽  
Group Iii ◽  
T Wave ◽  
Group I ◽  
St Segment ◽  
Group Ii ◽  
Acute Inferior Myocardial Infarction

Background: The patient with inferior wall AMI, site of culprit lesions is an important determinant of outcome. Patient with RV infarction have a poor prognosis whereas those with occlusion of LCX have a good prognosis. Early diagnosis and treatment substantially reduce cardiac events particularly in high-risk patients. V4R can be used as to locate the site of obstruction. Materials and methods: 81 patients with acute inferior myocardial infarction admitted to the coronary care unit (CCU) within 12 hours after the onset of chest pain who underwent coronary angiogram were included in the study. Standard 12-lead ECG with right precordial lead V4R was recorded. Patients were categorized into within 3 groups according to early changes of V4R-Group- I - ST-segment elevation > 1 mm and positive T- wave, Group-II- ST-segment iso-electric and positive T-wave, Group-III- ST-segment depression >1 mm and negative T -wave. Results: In group I patients, highest percentage of the patients had lesion in proximal RCA (97.2%); whereas in group II patients, highest percentage in the distal RCA (89.7%) followed by LCX (41.4%) and in group III patients, highest percentage also in LCX (100.0%) followed by LAD (56.3%). Based on analysis of sensitivity and specificity, it was revealed that in group I patients of ECG finding suggested 100.0% sensitivity, 97.8% specificity and 98.8% accuracy. In group II patients, 92.9% sensitivity, 94.3% specificity and 93.8% had accuracy. In case of group III patients, 93.8% sensitivity, 98.5% specificity and 97.5% accuracy. Conclusion: The configuration of the ST-T segment in lead V4R is a sensitive and specific tool to recognize the occluded vessel in acute inferior MI whether it is proximal RCA, distal RCA or LCX. Since it is an inexpensive method, it can be readily used to locate the site of occlusion in AMI - Inferior. Keywords: Coronary artery disease; Myocardial infarction;, Lead V4r. DOI: http://dx.doi.org/10.3329/cardio.v4i1.9389 Cardiovasc. J. 2011; 4(1): 46-52

Features of ST segment and T-wave in exercise-induced myocardial ischemia evaluated with multichannel magnetocardiography

2002 ◽  
Vol 34 (2) ◽  
pp. 120-129 ◽  
Author(s):  
Helena Hänninen ◽  
Panu Takala ◽  
Petri Korhonen ◽  
Lasse Oikarinen ◽  
Markku Mäkijärvi ◽  
...  
Keyword(s):  
Myocardial Ischemia ◽  
T Wave ◽  
St Segment ◽  
Exercise Induced

Imaging QRS complex and ST segment in myocardial infarction

2014 ◽  
Vol 47 (4) ◽  
pp. 438-447 ◽  
Author(s):  
Ljuba Bacharova ◽  
Lia E. Bang ◽  
Vavrinec Szathmary ◽  
Anton Mateasik
Keyword(s):  
Myocardial Infarction ◽  
Qrs Complex ◽  
St Segment
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