WordNet

an undulating curve (同)undulation
a persistent and widespread unusual weather condition (especially of unusual temperatures); "a heat wave"
set waves in; "she asked the hairdresser to wave her hair"
a movement like that of a sudden occurrence or increase in a specified phenomenon; "a wave of settlers"; "troops advancing in waves"
one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) (同)moving ridge
(physics) a movement up and down or back and forth (同)undulation
the act of signaling by a movement of the hand (同)waving, wafture
a hairdo that creates undulations in the hair
something that rises rapidly; "a wave of emotion swept over him"; "there was a sudden wave of buying before the market closed"; "a wave of conservatism in the country led by the hard right"
the 20th letter of the Roman alphabet (同)t
a member of the womens reserve of the United States Navy; originally organized during World War II but now no longer a separate branch
a tough youth of 1950s and 1960s wearing Edwardian style clothes (同)Teddy boy

PrepTutorEJDIC

(前後左右・上下に)『揺れる』,ひらめく,ひらひらする / (波形に)『起伏する』,うねる / (手・旗などを振って)『合図する』,手を振る;(…のために,…に向かって)手を振る《+in(to, at)+名》 / (に向かって)‘…を'振る,揺り動かす,ひらめかす《+名+at+名》 / 《方向を表す副詞[句]を伴って》(手・旗などを振って)〈人〉‘に'『合図する』 / ‘…を'起伏させる,うねらせる:〈頭髪〉‘を'ウエーブさせる / 『波』,波浪 / (…の)『波のような動き』,うねり《+of+名》 / (感情・景気などの一時的な)高まり,強まり;(寒暑の)急激な波《+of+名》 / (手・旗などを)振ること,振ってする合図;(…を)振ること《+of+名》 / (髪の)縮れ,ウエーブ / (光・音・電気などの)波
tritiumの化学記号

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/08 15:16:52」(JST)

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Schematic representation of normal ECG

In Electrocardiography, the T wave represents the repolarization (or recovery) of the ventricles. The interval from the beginning of the QRS complex to the apex of the T wave is referred to as the absolute refractory period. The last half of the T wave is referred to as the relative refractory period (or vulnerable period). The T wave contains more information than the QT interval. The T wave can be described by its symmetry, skewness, slope of ascending and descending limbs, amplitude and subintervals like the T_peak–T_end interval.^[1]

In most leads, the T wave is positive. This is due to the repolarization of the membrane. During ventricle contraction (QRS wave), the heart depolarizes. Repolarization of the ventricle happens in the opposite direction of depolarization and is negative current. This double negative (direction and charge) is why the T wave is positive; although the cell becomes more negatively charged, the net effect is in the positive direction, and the ECG reports this as a positive spike.^[2] However, a negative T wave is normal in lead aVR. Lead V1 may have a positive, negative, or biphasic (positive followed by negative, or vice versa) T wave. In addition, it is not uncommon to have an isolated negative T wave in lead III, aVL, or aVF.

Clinical significance

T-wave inversion (negative T waves) can be a sign of coronary ischemia, Wellens' syndrome, left ventricular hypertrophy, or CNS disorder.
A periodic beat-to-beat variation in the amplitude or shape of the T wave may be termed T wave alternans.
Tall and narrow ("peaked" or "tented") symmetrical T waves may indicate hyperkalemia.
Flat T waves (less than 1 mV in the limb leads and less than 2 mV in the precordial leads)^[3] may indicate coronary ischemia or hypokalemia^[3]
The earliest electrocardiographic finding of ST-elevation MI (STEMI) acute myocardial infarction is sometimes the hyperacute T wave, which can be distinguished from hyperkalemia by the broad base and slight asymmetry. This may also be seen in Prinzmetal angina.
When a bundle branch block is present, the T wave should be deflected opposite the terminal deflection of the QRS complex. This is known as appropriate T wave discordance.

Frequency of inverted T-waves in precordial leads (lead V1 to V6) according to gender and age

Numbers from Lepeschkin E in ^[4]

	Age (ethnicity)	n	V1	V2	V3	V4	V5	V6
Children
	1 week - 1 y	210	92%	74%	27%	20%	0.5%	0%
	1 y - 2 y	154	96%	85%	39%	10%	0.7%	0%
	2 y - 5 y	202	98%	50%	22%	7%	1%	0%
	5 y - 8 y	94	91%	25%	14%	5%	1%	1%
	8 y - 16 y	90	62%	7%	2%	0%	0%	0%
Males
	12 y - 13 y	209	47%	7%	0%	0%	0%	0%
	13 y - 14 y	260	35%	4.6%	0.8%	0%	0%	0%
	16 y - 19 y (whites)	50	32%	0%	0%	0%	0%	0%
	16 y - 19 y (blacks)	310	46%	7%	2.9%	1.3%	0%	0%
	20 - 30 y (whites)	285	41%	0%	0%	0%	0%	0%
	20 - 30 y (blacks)	295	37%	0%	0%	0%	0%	0%
Females
	12 y - 13 y	174	69%	11%	1.2%	0%	0%	0%
	13 y - 14 y	154	52%	8.4%	1.4%	0%	0%	0%
	16 y - 19 y (whites)	50	66%	0%	0%	0%	0%	0%
	16 - 19 y (blacks)	310	73%	9%	1.3%	0.6%	0%	0%
	20 - 30 y (whites)	280	55%	0%	0%	0%	0%	0%
	20 - 30 y (blacks)	330	55%	2.4%	1%	0%	0%	0%

References

^ Haarmark C, Graff C, Andersen MP et al. (2010). "Reference values of electrocardiogram repolarization variables in a healthy population". Journal of Electrocardiology 43 (1): 31–9. doi:10.1016/j.jelectrocard.2009.08.001. PMID 19740481.
^ http://www.kumc.edu/AMA-MSS/Study/phys2.htm
^ ^a ^b Loyola University Chicago Stritch School of Medicine. > EKG Interpretive skills Retrieved on April 22, 2010
^ Antaloczy, Z (1979). Modern Electrocardiology. Amsterdam: Excerpta Medica. p. 401.

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1. 心電図チュートリアル：SＴ波およびT波の変化 ecg tutorial st and t wave changes
2. T波（再分極）の交互脈：臨床的側面 t wave repolarization alternans clinical aspects
3. T波（再分極）の交互脈：技術的側面 t wave repolarization alternans technical aspects
4. 心電図チュートリアル：心電図分析の基本原則 ecg tutorial basic principles of ecg analysis
5. 心電図チュートリアル：心筋虚血および心筋梗塞 ecg tutorial myocardial ischemia and infarction

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