We report the case of a patient who developed severe hypoxemia and an unusual arrhythmia, accelerated idioventricular rhythm, during flexible fiberoptic bronchoscopy. Coronary artery disease was subsequently suspected despite an unremarkable history and physical examination, and confirmed by a thallium 201 imaging. The appearance of ...
Energy Citations Database
Accelerated Idioventricular Rhythm (AIVR) is a ventricular rhythm consisting of three or more consecutive monomorphic beats, with gradual onset and gradual termination. It can rarely manifest in patients with completely normal hearts or with structural heart disease. It is usually seen during acute myocardial ...
PubMed Central
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Cancer.gov
Five apparently healthy people (aged 16-47) presented with recurrent episodes of accelerated idioventricular rhythm characterised by left bundle branch block and right axis deviation. Clinical history, physical findings, basic electrocardiogram, chest x ray, and blood tests were within normal limits in all. Holter monitoring, exercise ...
Forty-four patients with acute myocardial infarction were studied using 24-hour electrocardiographic monitoring. A linear correlation has been shown to exist between heart rate preceding accelerated idioventricular rhythm and ventricular tachycardia and the rates of these. The prematurity index was found to be inversely related to the ...
... disturbances, noted in all groups given >25 ug/kq, included heart block, premature ventricular contractions and idioventricular rhythms. ...
DTIC Science & Technology
Aims: Accelerated idioventricular rhythm (AIVR) is very frequently observed in primary percutaneous coronary intervention (PCI), however knowledge of the haemodynamic effects is lacking. Methods and results: We studied an ST-segment elevation myocardial infarction cohort of 128 consecutive patients (aged 62�11years) in whom AIVR ...
PubMed
The effect of an acute change in blood pressure (BP) on ventricular ectopic activity and the influence of antiarrhythmic agents on this effect were examined in 24 patients. In 11 patients with premature ventricular complexes (PVCs), the BP was temporarily reduced by a sodium nitroprusside drip. In all of them the incidence of PVCs was reduced (or annihilated) by the induced hypotension. In 13 ...
... was made to accelerate the reentrainment of circadian rhythms in squirrel ... The daily acrophases of the circadian rhythm of body temperature were ...
Incidence and severity of ventricular arrhythmias (VA) following transvenous catheter ablation have so far not been fully elucidated. In the present study we evaluated the comparative incidence of postablation ventricular arrhythmias following high voltage-direct current electrical ablation (DCA), radiofrequency-ablation (RFA), and laser-photoablation (LPA). Experiments were performed on a total ...
An isochronic ventricular rhythm is also called an accelerated ventricular rhythm because it represents an active ventricular focus. This arrhythmia is a common reperfusion arrhythmia in acute MI patients. It often begins and ends with fusion beats and there is AV dissociation. Treatment is usually not necessary because the arrhythmia ...
NSDL National Science Digital Library
Normal sinus rhythm is interrupted by an accelerated ventricular rhythm whose rate is slightly faster than the sinus rhythm. Fusion QRS complexes occur whenever the sinus impulse enters the ventricles at the same time the ectopic ventricular focus initiates its depolarization.
CONTENTS: Temperature; Radiant Energy; Sound, Vibration, and Impact; Acceleration and Gravity; Atmosphere and Pollutants; Atmospheric Pressures; Gases; Water; Solutes; Biological Rhythms.
National Technical Information Service (NTIS)
... under transverse accelerations were extrasystole, migration of cardiac rhythm from the sinus to the atrioventricular node, sinoatrial blockade ...
Age-related effects on circadian rhythms include reductions of rhythm amplitude, alterations in re-entrainment, and increased fragmentation. Currently, the pattern of these changes across an individuals � lifespan is unknown. The present study used a cross-sequential experimental design to determine the pattern of circadian rhythm ...
E-print Network
RESEARCH ARTICLE Age-related disruptions of circadian rhythm and memory in the senescence and circadian rhythms with a focus on the senescence-accelerated mouse (SAM) as a model of aging. We explore-Fos . circadian rhythms . mouse . running wheel . SAMP8 . suprachiasmatic nucleus Cognitive impairments are well
Cigarette smoking is a major risk factor for heart attack. The pathologic mechanisms responsible for this association are obscure. It has been reported that approximately one-third of human volunteers, smokers and nonsmokers, exhibit immediate cutaneous hypersensitivity to a glycoprotein antigen (TGP) purified from cured tobacco leaves and present in cigarette smoke. It is also known that the ...
Bromochlorodifluoromethane (halon 1211, a fire extinguisher), like other fluorocarbons, has been linked with ventricular arrhythmias and myocardial depression. Ten healthy firefighters, aged 40-50, were exposed to 1,000 ppm halon while exercising, in a double-blind, placebo-controlled crossover experiment, and were monitored during and after exposure. Complex ectopy (ventricular couplets and ...
This complicated rhythm strip illustrates 'supernormal' conduction... a situation where conduction is better than expected. The ladder diagram shows that the accelerated ventricular rhythm prevents most of the sinus impulses from reaching the ventricles. Only appropriately timed sinus impulses reach the ventricle - indicated by the "C" ...
We present a 57-year old male patient with thalassemia intermedia and right heart failure. He had a 30-year history of anemia and short-term iron therapy without blood transfusion. Hemoglobin level was 7.1 g/dl and hematocrit was 22.7%. White blood-cell and platelet counts, and serum ferritin level were normal. Electrocardiography showed irregular narrow QRS bradyarrhythmia, suggesting slow atrial ...
A system for simultaneous 24-hour tape recording of ECG and respiration has been developed and used in the study of 4 groups of newborn infants. In 50 randomly selected, healthy term infants, the mean lowest heart rate (>9 beats' duration; was 88 � 13. 14 (28%) infants had junctional escape rhythms, 5 had supraventricular, and 2 ventricular premature beats. 34 (68%) ...
Feb 12, 2008 ... All, 1 : Accelerated Bone Loss and Fracture Risk ... 27 : Human Performance Failure Due to Sleep Loss and Circadian Rhythm Problems ...
NASA Website
Mar 1, 2011... in maintaining circadian rhythm stability as the commonly used ... Acceleration in precession also arises from tides and changing J(sub ...
. READAPTATION OF RAT LOCOMOTOR ACTIVITY AND DEEP BODY TEMPERATURE CIRCADIAN RHYTHMS FOLLOWING EXPOSURE) circadian rhythms to acute hypergravity onset and chronic hypergravity exposure. Our study differs from and stabilization durations for several circadian rhythm metrics. Methods: Two studies were performed on the 24 foot
... ECG) disturbances, noted in all groups given > or = 25 micrograms/kg, included heart block, premature ventricular contractions and idioventricular ...
Four volunteers were subjected to negative acceleration in a human centrifuge for the purpose of testing a standard lap belt. Three subjects developed a sinus bradycardia. The fourth developed a sinus arrest with a junctional rhythm at -2 G. With return t...
The effect of atropine and of the bispyridinium oximes, HI6 and HL� 7, on the electrocardiographic pattern was investigated in acutely nerve agent-poisoned guinea-pigs. The electrocardiographic, circulatory and respiratory parameters were recorded in female urethane-anaesthetized Pirbright-white guinea-pigs. After base line measurements, the animals received pyridostigmine (0.05 mumol/kg) and, ...
It has been debated that primary coronary angioplasty could be more effective if immediate antithrombotic therapy would contribute to a faster recanalization of the infarct-related artery. This is the first report of a patient who presented at the emergency department with acute anterolateral myocardial infarction, in whom a single bolus injection of c7E3 Fab (0.25 mg/kg body weight) led to ...
An attempt was made to accelerate the reentrainment of circadian rhythms in squirrel monkeys exposed to 8-hr phase advances and phase delays of the daily light-dark cycle by timed administration of the short-acting benzodiazepine, triazolam. On the day of...
The localized irradiation of the heart of the chicken embryo, exposed at the third day of incubation, causes modifications of the cardiac physiology, involving the pulsating force, which is reduced, and the rhythm, which is accelerated. These phenomena occur early and are generally reversible, even for high radiation doses. (tr-auth)
The brain's ability to synchronize movement with external cues is used daily, yet neuroscience is far from a full understanding of the processes that allow these simple sequential performances. This experimental design was implemented to determine differences in brain activity when finger tapping at increasing and decreasing rhythms. Eight subjects tapped their right index ...
NASA Astrophysics Data System (ADS)
Biorhythmic changes in spore (correction of sport) formation in the Pushchino strain of Actinomyces levoris Kras cultures on board Soyuz and Apollo during their joint flight in July 1975 are analysed and compared with control cultures on earth. Biorhythm changes during the flight period showed up as both a slowing down (most cultures) and, in a few cases, an acceleration of ...
The heart of the chicken embryo, at the stage of 80 to 88 hours of incubation, accelerates immediately the rhythm of its contractions when it is irradiated in situ with an x-ray beam of very high output; this acceleration is rapidly followed by slowing and arythmia. These facts suggest a stimulating effect for x rays preceding ...
Type 2 diabetes mellitus (T2DM) is complex metabolic disease that arises as a consequence of interactions between genetic predisposition and environmental triggers. One recently described environmental trigger associated with development of T2DM is disturbance of circadian rhythms due to shift work, sleep loss, or nocturnal lifestyle. However, the underlying mechanisms behind ...
IntroductionA number of predisposing factors have been suggested to be contributing to drug-induced torsade de pointes (TdP) arrhythmias: short-long-short (SLS) sequence, bradycardia, timing of drug administration, anaesthesia, ventricular remodelling, and altered ventricular activation due to ventricular ectopic beats (SLS) or idioventricular rhythm ...
Background and purpose:The Na+/Ca2+ exchanger (NCX) may contribute to triggered activity and transmural dispersion of repolarization, which are substrates of torsades de pointes (TdP) type arrhythmias. This study examined the effects of selective inhibition of the NCX by SEA0400 on the occurrence of dofetilide-induced TdP.Experimental approach:Effects ...
OBJECTIVE--To assess the effects of oral vasodilator treatment on ventricular arrhythmias in acute myocardial infarction. SETTING--Coronary care units at the John Radcliffe Hospital, Oxford, and the Royal Infirmary, Edinburgh. PATIENTS--100 patients with suspected acute myocardial infarction entered the study at a mean of 13 hours from symptom onset. DESIGN OF INTERVENTION--Double blind ...
... Synthesis in Circadian Rhythm Generation; Mechanisms of Vertebrate Pacemakers; Photoperiodism and Seasonal Rhythms; Human Rhythms and ...
... Abstract : The circadian rhythm of body-temperature ... The average rhythm of those ... Descriptors : *BIOLOGICAL RHYTHMS, *BODY TEMPERATURE ...
... for control animals showed a diurnal rhythm. ... the day showed diurnal rhythms for the ... Descriptors : *CIRCADIAN RHYTHMS, *DRUGS, BRAIN, RATS ...
... it can be concluded that human circadian rhythms can be ... tion of this transient state of rhythm disturbances are different in rhythms of different ...
A nine-year-old girl had an episode of atrial flutter and a nonsustained wide QRS tachycardia during her initial hospitalization after orthotopic heart transplantation. Evaluation of her ECG and telemetric tracing revealed atrial flutter of the recipient atrium and sinus rhythm of the donor atrium. The wide QRS tachycardia was an accelerated ventricular ...
... an influence of the circadian rhythm on the ... Descriptors : *CIRCADIAN RHYTHMS, *MICROWAVES, HORMONES, PHYSIOLOGICAL EFFECTS ...
... Individual differences in circadian rhythms will be addressed, and some published circadian rhythm models will be discussed. ...
... revealed a circadian periodicity with ... an endogenous rhythm of magnesium and ... EXCRETION, BIOLOGICAL RHYTHMS, EXERCISE(PHYSIOLOGY ...
Some rhythm and conduction abnormalities can occur in children with acute rheumatic fever. These abnormalities have been defined based on standard electrocardiography; however, the real prevalence of these abnormalities has not been investigated previously by the evaluation of long-term electrocardiographic recordings. In this study, we evaluated the asymptomatic ...
Neurons in the supramammillary nucleus (SUM) of urethane-anesthetized rats fire rhythmically in synchrony with hippocampal theta rhythm. As these neurons project to the septum and hippocampus, it is generally assumed that their role is to mediate ascending activation, leading to the hippocampal theta rhythm. However, the connections between SUM and the ...
Ovariectomized golden-mantled ground squirrels (Spermophilus lateralis) were implanted with estradiol benzoate (EB)-filled or empty capsules. Body weight was monitored for at least 1 yr before, during, and after hormone treatment. EB treatment of 6-7 mo duration, restricted to the weight-gain phase, decelerated weight gain and delayed attainment of peak weight by 34 days; the period of the ...
Electrocardiograms were recorded during 45-sec. exposures to +6.5 to +9.0 Gz of 14 human subjects on the USAF School of Aerospace Medicine human centrifuge. Maximum heart rate (HR) reached by each subject ranged from 155 to 205 beats/min. Four subjects de...
The relatively long evolution of radiation sickness in the scorpion Androctonus amoreuxi, after exposure to high gamma doses of 50,000 to 90,000 r confirms the high radioresistivity of this species. Behavior modifications because of shock to sensory and neuromotive centers, an acceleration of the cardiovascular rhythm, and a decrease of the body ...
... Antipyretic Drugs on the Circadian Rhythm in Body ... ANTIPYRETICS, *BODY TEMPERATURE, *CIRCADIAN RHYTHMS, *PROSTAGLANDIN, RATS ...
... marked effects on circadian rhythms demonstrated in ... activity, including entrainment, rhythm generation and ... for expression of overt rhythms are not ...
... Title : Sleep, Wakefulness and Circadian Rhythm. ... The lectures will fall into three subject categories: Sleep, wakefulness and circadian rhythms. ...
... a data analysis system for dealing with activity rhythm data collected by computer. Descriptors : *CIRCADIAN RHYTHMS, *BIOLOGICAL RHYTHMS ...
... Title : Neurophysiological Analysis of Circadian Rhythm Entrainment. ... in the regulation of SCN neuronal activity and behavioral circadian rhythms. ...
... results suggest that the melatonin sensitivity rhythm is largely ... SCN; the effects of NGF on circadian phase of freerunning activity rhythms; and the ...
... in hamsters can alter the rhythm of melatonin ... amplitude of the SCN pacemaker's output rhythms. ... cells depends on the circadian phase tested. ...
... Title : Neurophysiological Analysis of Circadian Rhythm Entrainment. ... Descriptors : *CIRCADIAN RHYTHMS, *NERVE CELLS, *ENTRAINMENT ...
... of the melatonin sensitivity rhythm of SCN ... Descriptors : *NERVE CELLS, *CIRCADIAN RHYTHMS, *ENTRAINMENT, LIGHT, SENSITIVITY, PHASE ...
... the ventrolateral SCN where photic projections terminate, 2) a rhythm of VIP ... into the SCN mimics the phase delay of circadian rhythms produced by ...
rhythms in monkeys, resetting of circadian eclosion rhythm in fruitflies, the effectiveness of mathematical models of circadian rhythms, the influence of ac ...
The present invention provides methods of identifying circadian rhythm modulators and methods of modulating circadian rhythm in animals.
... regulation is responsible for the circadian rhythm in heart ... Descriptors : *CIRCADIAN RHYTHMS, *MELATONIN, *PINEAL GLAND, OUTPUT, BRAIN ...
... the Pineal Gland and Circadian Rhythms" ON TIME. ... to express their internally driven circadian pattern of ... the nature of the entrained rhythm nor was ...
clearly demonstrated the participation of a circadian rhythm in the ... The majority of the evidence for the involvement of circadian rhythms in flowering ...
... Title : Gene Regulation in Memory Formation and Circadian Rhythm. ... were to investigate the role of gene expression in circadian rhythms and in ...
... supplied by the host were not capable of synchronizing the rhythms of each ... There was no circadian rhythm of expression of core-clock genes or cell ...
... 4. TITLE AND SUBTITLE Disruption of the Circadian Rhythms of Gene ... the circadian cycle, consistent with a level of circadian rhythm control (figure ...
... Disruption of the Circadian Rhythms of Gene Expression and the ... we have examined the circadian expression of 14 ... we have found a rhythm in the ...
... Title : Disruption of the Circadian Rhythms of Gene Expression and the ... Abstract : This project investigated the effects of rhythm disruption in mice on ...
... Title : Disruption of the Circadian Rhythms of Gene Expression and the Development ... a mouse model to examine the effects of rhythm disruption on ...
... Title : Disruption of the Circadian Rhythms of Gene Expression and the Development of ... show that shift work produces a shift in the rhythm of core ...
... Temperature and Performance Circadian Rhythm as a ... for body temperature rhythm took 11 ... Descriptors : *BIOLOGICAL RHYTHMS, FLIGHT CREWS ...
... circadian rhythm desynchronization than from sleep deprivation. RESYNCHRONIZING CIRCADIAN RHYTHMS Several ...
... Title : Circadian Rhythms in Zebrafish. ... Robust circadian rhythms of behavior in both larval and adult zebrafish were found and characterized. ...
... that our results on the circadian temperature rhythm ... and mouse had in common a consideration of circadian rhythms in the variables examined. ...
... When these rhythm disturbances affect performance ... Descriptors : *CIRCADIAN RHYTHMS, SYMPOSIA, PERFORMANCE(HUMAN), EFFICIENCY ...
... Title : Circadian Rhythm Amplitude Effects on Nocturnal Brain ... Descriptors : *CIRCADIAN RHYTHMS, *MENTAL ABILITY, BRAIN, PERFORMANCE ...
Circadian rhythm: Circadian rhythms, also called diurnal rhythms, are biological rhythms or variations that repeat with a cycle of about 24 hours. Citrate: A citrate ...
... that peaks at night, and/or the 24 hr rhythm of GRP ... If so, the 24 hr rhythms in VIP/PHI and ... Circadian wheelrunning rhythms were monitored In all rats ...
Circadian Rhythms Fact Sheet What are circadian rhythms? Circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in ...
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