WordNet

a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods" (同)geological period
(ice hockey) one of three divisions into which play is divided in hockey games
the end or completion of something; "death put a period to his endeavors"; "a change soon put a period to my tranquility"
the interval taken to complete one cycle of a regularly repeating phenomenon
a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop" (同)point, full_stop, stop, full point
temporarily unresponsive or not fully responsive to nervous or sexual stimuli; "the refractory period of a muscle fiber"
not responding to treatment; "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains" (同)stubborn
(Persian folklore) a supernatural being descended from fallen angels and excluded from paradise until penance is done
a beautiful and graceful girl
of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart)

PrepTutorEJDIC

(あることが続く)『期間』 / (歴史的な)『時代』 / (試合の)『一区切り』,ピリオド / 授業時間,時限: / (循環して起こる現象などの)周期 / (回転運動などの)周期 / 紀(地質時代の区分の一つ;era(代)の下,epoch(世)の上) / 《おもに米》『ピリオド』,終止符(《英》full stop;Mr.,U.S.など略語の符号(.)も含む) / 《複数形で》《文》掉尾(とうび)文(多くの節から成り,論理的に緊密な構成をもっている文) / 《名詞の前にのみ用いて》ある時代[特有]の,時代物の / (文の終わりに感嘆詞的に)以上,終わり・月経（期間）
(人などが)手に負えない,強情な / (病気が)治りにくい,がんこな / (金属などが)溶けにくい,耐火性の
屈折媒体(レンズ) / =refracting telescope

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Monteil B1, Ploux S2, Eschalier R3, Ritter P2, Haissaguerre M2, Koneru JN4, Ellenbogen KA4, Bordachar P2.
Pacing and clinical electrophysiology : PACE.Pacing Clin Electrophysiol.2015 Dec;38(12):1489-98. doi: 10.1111/pace.12750. Epub 2015 Nov 5.
Pacemaker-mediated tachycardia (PMT) is the term used to describe a repetitive sequence of sensed retrograde P waves followed by ventricular pacing at or below the maximum tracking rate. The following events can promote atrioventricular (AV) dissociation, retrograde conduction, and the onset of PMT:
PMID 26403498

Uncommon presentation of drug-refractory pacemaker-mediated common atrioventricular nodal reentrant tachycardia and a simple solution by reprogramming.

Horie K1, Otomo K, Mori S, Kikuchi Y, Meguro T.
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An 81-year-old woman who had undergone dual chamber pacemaker implantation for sick sinus syndrome was referred to our hospital with drug-refractory common atrioventricular (AV) nodal reentrant tachycardia. Ventricular pacing (Vp) following premature atrial contraction (PAC) with a long AV interval
PMID 25948348

Santangeli P1, Tsiperfal A, Wang PJ, Al-Ahmad A.
Heart rhythm : the official journal of the Heart Rhythm Society.Heart Rhythm.2013 Dec;10(12):1824-5. doi: 10.1016/j.hrthm.2013.07.036. Epub 2013 Jul 24.
PMID 23891958

Uncommon Presentation of Drug-refractory Pacemaker-mediated Common Atrioventricular Nodal Reentrant Tachycardia and a Simple Solution by Reprogramming