奇異性分裂
WordNet
- seemingly contradictory but nonetheless possibly true; "it is paradoxical that standing is more tiring than walking" (同)self-contradictory
PrepTutorEJDIC
- 逆説の;逆説を好む / 矛盾する
- (頭痛などが)割れるような
UpToDate Contents
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English Journal
- When to go with the crowd: modelling synchronization of all-or-nothing activity transitions in grouped animals.
- Dostalkova I, Spinka M.SourceFaculty of Biological Sciences, University of South Bohemia, Branisovska 31, 370 05 Ceske Budejovice, Czechia. dost@prf.jcu.cz
- Journal of theoretical biology.J Theor Biol.2010 Apr 21;263(4):437-48. Epub 2010 Jan 11.
- For groups of animals to keep together, the group members have to perform switches between staying in one place and moving to another place in synchrony. However, synchronization imposes a cost on individual animals, because they have to switch from one to the other behaviour at a communal time rath
- PMID 20060840
- Utilizing wavelet transform and support vector machine for detection of the paradoxical splitting in the second heart sound.
- Al-Naami B, Al-Nabulsi J, Amasha H, Torry J.SourceDepartment of Biomedical Engineering, Hashemite University, Zarqa, Jordan. b.naami@hu.edu.jo
- Medical & biological engineering & computing.Med Biol Eng Comput.2010 Feb;48(2):177-84. Epub 2009 Nov 19.
- Paradoxical splitting occurs when pulmonic valve (P2) closes before the aortic valve (A2). This causes second heart sound (S2) to be a single sound during inspiration and split during exhalation. Etiology delay in aortic closure: aortic stenosis, volume overload of left ventricle (LV), conduction de
- PMID 19924461
Japanese Journal
- Compressed Heart and Mitral Valve Prolapse in a Case of Duchennes Progressive Muscular Dystrophy with Thorax Deformity
- YAZAWA Yoshimitsu,NAGAI Tsuneo,HAYASHI Senji,SHIBATA Akira,MIYATANI Nobuyuki,TAKASAWA Naoyuki
- Japanese Heart Journal 26(5), 857-865, 1985
- … The second heart sound showed a paradoxical splitting. …
- NAID 130000764613
- Reversed Splitting of the Second Heart Sound in Arterial Stenotic Lesions
- SAKAMOTO Tsuguya,YAMADA Tetsuro,UOZUMI Zenichiro,CHANG Sheng Yu,NAKAMURA Hidezo,UEDA Hideo
- Japanese Heart Journal 9(6), 539-551, 1968
- … The behavior of the splitting of the second heart sound was analyzed in 78 cases with peripheral arterial stenosis, including 51 of "aortitis syndrome" (Takayasus arteritis). … Reversed or paradoxical splitting was observed in 10 cases of aortitis syndrome and 1 case with renal artery stenosis. … Frequent occurrence of the reversed splitting was observed in "extensive" form of aortitis syndrome (8 out of 18 cases, i.e. 44%). …
- NAID 130000769618
- メトキサミン負荷後,吸気性にII音分裂間隔の増大するreversed splittingを示した完全左脚ブロックの1例 : 第44回日本循環器学会関東甲信越北陸地方学会
- 上田 英雄,坂本 二哉,魚住 善一郎,川井 信義,山田 哲郎,井上 清,堀向 梅乃
- Japanese circulation journal 31(8), 1278, 1967-08-15
- NAID 110002598013
Related Links
- Paradoxical Splitting of the Second Sound The normal or "physiological" splitting of the second heart sound (see physiological splitting podcast) increases so as to be recognizable after inspiration but inaudible after expiration.
- Definition Split S2 results from asynchronous closure of aortic (A2) and pulmonic (P2) valves. Normally, the separation of A2 and P2 is ~40 msec during inspiration. Listening Areas Heard over 3LICS and 4LICS (also called LLSB), where P2 is loudest.
Related Pictures
★リンクテーブル★
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- 英
- second heart sounds, S2
- 関
- 心音
まとめ
II音増大
- MSとASとでは、同じstenosisでも心音の大きさに関与の仕方が違うんですね。
- 拡張期における大動脈圧、肺動脈圧が高い → 弁に衝突する血液の流速が早い → 弁の閉鎖音が大きい
- 大動脈弁が閉じるとき、拡張期早期 back pressureが高い?
- 拡張期に大動脈弁を挟んだback pressureが高いから?
II音減弱
分裂音
- PHD.33-35
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横隔膜の相対的位置
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II音
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呼気
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expiration
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 ̄
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single sound
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吸気
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inspiration
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_
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splitting sound
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- (1)吸気時には、肺の血管抵抗性が低下 → 拡張期におけるP弁へのback pressureは呼気時と比べ比較的低下する →P弁の開放時間が延長
- (2)吸気時には、肺静脈が拡張 → 左房・左室への血液還流量が減少 → 左室を充満する血液量減少 → 一回拍出量減少 → 駆出時間の短縮 → A弁の開放時間が短縮
- right bundle branch block(RBBB), pulmonic stenosis(PS)
- IIAが早まる:MR, VSD
- IIPが遅れる:RBBB, PS, pulmonary hypertension
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- 英
- paradoxical splitting
- 関
- II音、生理的分裂 physiologic splitting
概要
- 通常の心音はS1→A2→P2 だけど、奇異性分裂ではS1→P2→A2となる。
原因
- A弁閉鎖の遅延:(1)left bundle branch block(LBBB), (2)advanced aortic stenosis(AS), 高血圧?, (4)閉塞性肥大型心筋症 HOCM(YN.C-135).
呼吸性変動との関連
- 生理的分裂では、吸気時には、肺血管抵抗が下がる事によるP2の遅れ + 肺静脈拡張にともなうLVの拍出量減少によるA2の早期閉鎖により大きくA2→P2と広がっている。
- 呼気時:S2(P2→A2が打ち消されるため)
- 吸気時:P2→A2(A2のdelay)
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- 関
- bizarre、paradoxic、paradoxically
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- 関
- paradoxical、paradoxically