Definition, Betydelse & Synonymer | Engelska ordet PACEMAKER

Definition av PACEMAKER

1. en som sätter takten i ett lopp, för att guida de övriga; hare
2. (anatomi) en uppsättning nerver som stimulerar hjärtat till att slå
3. (medicin) pacemaker

Exempel på hur du använder PACEMAKER i en mening

• The primary purpose of a pacemaker is to maintain an even heart rate, either because the heart's natural cardiac pacemaker provides an inadequate or irregular heartbeat, or because there is a block in the heart's electrical conduction system.
• Earl Bakken, inventor of the first external, battery-operated, transistorized, wearable artificial pacemaker, founder of Medtronic.
• Subsequently, the body's natural pacemaker in the sinoatrial node of the heart is able to re-establish normal sinus rhythm.
• On 6 May 1954, he acted as pacemaker for Roger Bannister when the latter ran the first sub-four-minute mile at Iffley Road Stadium in Oxford.
• It employs pacemaker cells that produce electrical impulses, known as cardiac action potentials, which control the rate of contraction of the cardiac muscle, that is, the heart rate.
• Sinus node dysfunction (SND), also known as sick sinus syndrome (SSS), is a group of abnormal heart rhythms (arrhythmias) usually caused by a malfunction of the sinus node, the heart's primary pacemaker.
• Legend holds that he was supposed to be the rabbit (pacemaker) for his highly regarded stablemate, the gelding Billy Kelly, but that assumption is only partially true; in reality Sir Barton was regarded at having a better chance of winning the Kentucky Derby than Billy Kelly, owing to both his weight allowance as a maiden as well as the fitness he had demonstrated in the preparations for the Derby.
• He once used a fake Baseball Hall of Fame letterhead to ask Skowron to donate his pacemaker after he died.
• They include diverse potentials such as receptor potentials, electrotonic potentials, subthreshold membrane potential oscillations, slow-wave potential, pacemaker potentials, and synaptic potentials.
• The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is an oval shaped region of special cardiac muscle in the upper back wall of the right atrium made up of cells known as pacemaker cells.
• Because the pacemaker potential represents the non-contracting time between heart beats (diastole), it is also called the diastolic depolarization.
• In his valedictory speech to parliament in June 2013 he stated that his political career had been affected by a range of health issues including "a stroke in 1993 followed by two lots of heart bypass surgeries, seven angioplasties, a pacemaker, diabetes and cancer".
• The idea that the SCN is the main circadian pacemaker in mammals was proposed by Robert Moore, who conducted experiments using radioactive amino acids to find where the termination of the retinohypothalamic projection occurs in rodents.
• Since this accessory pacemaker also activates independently of the impulse generated at the SA node, two independent rhythms can be noted on the electrocardiogram (ECG).
• The Owl was later rescued by his henchmen, and fitted with a neurological pacemaker to cure his ailment.
• In severe cases where the heart's ability to control and trigger heartbeats may be completely ineffective or unreliable, heart block can usually be treated by inserting an artificial pacemaker, a medical device that provides correct electrical impulses to trigger heart beats, compensating for the natural pacemaker's unreliability.
• AAI mode of an artificial pacemaker: Atrial chamber paced, Atrial chamber sensed, and Inhibiting response to sensing.
• Further innovations included the development of active shielding, whereby fringe fields hazardous to pacemaker wearers, causing difficulty and expense in siting, were virtually eliminated.
• The Chardack-Greatbatch pacemaker used Mallory mercuric oxide-zinc cells (mercury battery) for its energy source, driving a two transistor, transformer coupled blocking oscillator circuit, all encapsulated in epoxy resin, then coupled to electrodes placed into the myocardium of the patient's heart.
• Bakken modified the design for a transistorized metronome and created the first battery-powered external pacemaker.

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