Failure of intravenous pindolol to reduce the hemodynamic determinants of myocardial oxygen demand or enzymatically determined infarct size in acute myocardial infarction

1986 ◽  
Vol 4 (5) ◽  
pp. 420
Author(s):  
Alan F. Chou
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Infarct Size ◽  
Oxygen Demand ◽  
Myocardial Oxygen Demand ◽  
Hemodynamic Determinants

scholarly journals From bedside to bench and back again: translational studies of mechanical unloading of the left ventricle to promote recovery after acute myocardial infarction

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 1852 ◽  
Author(s):  
Navin K. Kapur ◽  
Shiva Annamalai ◽  
Lara Reyelt ◽  
Samuel J. Karmiy ◽  
Allen A. Razavi ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Heart Failure ◽  
Acute Myocardial Infarction ◽  
Pilot Trial ◽  
Oxygen Demand ◽  
Myocardial Damage ◽  
Reperfusion Therapy ◽  
Circulatory Support ◽  
Myocardial Oxygen Demand ◽  
St Segment Elevation

Heart failure is a major cause of global morbidity and mortality. Acute myocardial infarction (AMI) is a primary cause of heart failure due in large part to residual myocardial damage despite timely reperfusion therapy. Since the 1970’s, multiple preclinical laboratories have tested whether reducing myocardial oxygen demand with a mechanical support pump can reduce infarct size in AMI. In the past decade, this hypothesis has been studied using contemporary circulatory support pumps. We will review the most recent series of preclinical studies in the field which led to the recently completed Door to Unload ST-segment Elevation Myocardial Infarction (DTU-STEMI) safety and feasibility pilot trial.

Effects of relaxing music on cardiac autonomic balance and anxiety after acute myocardial infarction

1999 ◽  
Vol 8 (4) ◽  
pp. 220-230 ◽  
Author(s):  
JM White
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Heart Rate ◽  
Respiratory Rate ◽  
Oxygen Demand ◽  
Control Group ◽  
Myocardial Oxygen Demand ◽  
Treatment As Usual ◽  
Physiological Indicators ◽  
Experimental Group

BACKGROUND: Acute myocardial infarction places additional demands on an already compromised myocardium. Relaxing music can induce a relaxation response, thereby reversing the deleterious effects of the stress response. OBJECTIVES: To compare the effects of relaxing music; quiet, uninterrupted rest; and "treatment as usual" on anxiety levels and physiological indicators of cardiac autonomic function. METHODS: A 3-group repeated measures experimental design was used. Forty-five patients, 15 per group, with acute myocardial infarction were assigned randomly to 20 minutes of (1) music in a quiet, restful environment (experimental group); (2) quiet, restful environment without music (attention); or (3) treatment as usual (control). Anxiety levels and physiological indicators were measured. RESULTS: Immediately after the intervention, reductions in heart rate, respiratory rate, and myocardial oxygen demand were significantly greater in the experimental group than in the control group. The reductions in heart rate and respiratory rate remained significantly greater 1 hour later. Changes in heart rate, respiratory rate, and myocardial oxygen demand in the attention group did not differ significantly from changes in the other 2 groups. The 3 groups did not differ with respect to systolic blood pressure. Increases in high-frequency heart rate variability were significantly greater in the experimental and attention groups than in the control group immediately after the intervention. State anxiety was reduced in the experimental group only; the reduction was significant immediately and 1 hour after the intervention. CONCLUSIONS: Patients recovering from acute myocardial infarction may benefit from music therapy in a quiet, restful environment.

Preinfarction Angina and Improved Reperfusion of the Infarct-related Artery

1999 ◽  
Vol 82 (S 01) ◽  
pp. 68-72 ◽  
Author(s):  
Alessandro Sciahbasi ◽  
Eugenia De Marco ◽  
Attilio Maseri ◽  
Felicita Andreotti
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Infarct Size ◽  
Ischemic Preconditioning ◽  
Early Reperfusion ◽  
Vast Number ◽  
Beneficial Effects ◽  
Infarct Related Artery ◽  
Cardioprotective Effects ◽  
Collateral Vessels

SummaryPreinfarction angina and early reperfusion of the infarct-related artery are major determinants of reduced infarct-size in patients with acute myocardial infarction. The beneficial effects of preinfarction angina on infarct size have been attributed to the development of collateral vessels and/or to post-ischemic myocardial protection. However, recently, a relation has been found between prodromal angina, faster coronary recanalization, and smaller infarcts in patients treated with rt-PA: those with preinfarction angina showed earlier reperfusion (p = 0.006) and a 50% reduction of CKMB-estimated infarct-size (p = 0.009) compared to patients without preinfarction angina. This intriguing observation is consistent with a subsequent observation of higher coronary recanalization rates following thrombolysis in patients with prodromal preinfarction angina compared to patients without antecedent angina. Recent findings in dogs show an enhanced spontaneous lysis of plateletrich coronary thrombi with ischemic preconditioning, which is prevented by adenosine blockade, suggesting an antithrom-botic effect of ischemic metabolites. Understanding the mechanisms responsible for earlier and enhanced coronary recanalization in patients with preinfarction angina may open the way to new reperfusion strategies.A vast number of studies, globally involving ≈17,000 patients with acute myocardial infarction, have unequivocally shown that an infarction preceded by angina evolves into a smaller area of necrosis compared to an infarct not preceded by angina (Table 1) (1). So far, preinfarction angina has been thought to have cardioprotective effects mainly through two mechanisms: collateral perfusion of the infarctzone (2-4), and ischemic preconditioning of the myocardium (5-7). Here we discuss a further mechanism of protection represented by improved reperfusion of the infarct-related artery.

Abstract 12: EMMPRIN-Targeted Magnetic Nanoparticles for in vivo Visualization and Regression of Acute Myocardial Infarction in a Model of Acute Coronary Artery Occlusion

2015 ◽  
Vol 35 (suppl_1) ◽  
Author(s):  
Irene Cuadrado ◽  
Maria Jose Garcia Miguel ◽  
Irene Herruzo ◽  
Mari Carmen Turpin ◽  
Ana Martin ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Extracellular Matrix ◽  
Coronary Artery ◽  
Left Ventricle ◽  
Infarct Size ◽  
Coronary Artery Occlusion ◽  
Artery Occlusion ◽  
Gadolinium Enhancement

Extracellular matrix metalloproteinase inducer EMMPRIN, is highly expressed in patients with acute myocardial infarction (AMI), and induces activation of several matrix metalloproteinases (MMPs), including MMP-9 and MMP-13. To prevent Extracellular matrix degradation and cardiac cell death we targeted EMMPRIN with paramagnetic/fluorescent micellar nanoparticles with an EMMPRIN binding peptide AP9 conjugated (NAP9), or an AP9 scramble peptide as a negative control (NAPSC). NAP9 binds to endogenous EMMPRIN as detected by confocal microscopy of cardiac myocytes and macrophages incubated with NAP and NAPSC in vitro, and in vivo in mouse hearts subjected to left anterior descending coronary artery occlusion (IV injection 50mγ/Kg NAP9 or NAP9SC). Administration of NAP9 at the same time or 1 hour after AMI reduced infarct size over a 20% respect to untreated and NAPSC injected mice, recovered left ventricle ejection fraction (LVEF) similar to healthy controls, and reduced EMMPRIN downstream MMP9 expression. In magnetic resonance scans of mouse hearts 2 days after AMI and injected with NAP9, we detected a significant gadolinium enhancement in the left ventricle respect to non-injected mice and to mice injected with NAPSC. Late gadolinium enhancement assays exhibited NAP9-mediated left ventricle signal enhancement as early as 30 minutes after nanoprobe injection, in which a close correlation between the MRI signal enhancement and left ventricle infarct size was detected. Taken together, these results point EMMPRIN targeted nanoprobes as a new tool for the treatment of AMI.

Large infarct size and electrocardiographic reperfusion criteria. A study withTc99m sestamibi in anterior acute myocardial infarction treated with fibrinolysis

2005 ◽  
Vol 12 (2) ◽  
pp. S11-S11
Author(s):  
J GALCERA ◽  
I LOPEZMARTINEZ ◽  
A CABALLEROMARTINEZ ◽  
J DELAROSA ◽  
J VALENTIALDEGUER ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Infarct Size ◽  
Large Infarct
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