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Blazing goIITian

Joined:	1 Jan 2008
Post:	794

16 Apr 2008 11:31:03 IST

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537

BIOLOGY DOUBT

None

HEY GUYS IN ECG WE KNOW THT "T" CURVE STANDS FOR VENTRICULAR RELAXATION SO DONT U THINK THT THE CURVE SHOULD B INVERTED. BCOZ P AND QRS COMPLEX ARE FOR ATRIAL CONTRACTION AND VENTRICULAR CONTRACTION RESP. ?

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srk

Blazing goIITian

Joined: 1 Jan 2008

Posts: 794

16 Apr 2008 22:03:51 IST

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hey guys comeon yaar reply naa

mohit jain

Blazing goIITian

Joined: 4 Feb 2008

Posts: 861

16 Apr 2008 23:36:24 IST

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c this

http://www.hashminds.com/public/posts/list/656.jfm

srk

Blazing goIITian

Joined: 1 Jan 2008

Posts: 794

17 Apr 2008 21:32:24 IST

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mohitjain i m sonawanes61 of hashminds and let it make me clear tht i dont get replies on hashminds and so i asked d same here.
anyways thnks for the link.

chemicaltester

Scorching goIITian

Joined: 12 Mar 2008

Posts: 233

18 Apr 2008 23:35:20 IST

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naaa
u r wrong buddy
qrs complex suggest the spread of IMPULSE OF CONTRACTION FROM av to sa node
see below what i found in wiki

P wave

During normal atrial depolarization, the main electrical vector is directed from the SA node towards the AV node, and spreads from the right atrium to the left atrium This turns into the P wave on the ECG, which is upright in II, III, and aVF and inverted in a VR . A P wave must be upright in leads II and aVF and inverted in lead aVR to designate a cardiac rhythm as Sinus Rhythm.

PR interval

The PR interval is measured from the beginning of the P wave to the beginning of the QRS complex. It is usually 120 to 200 ms long.

QRS complex

The QRS comlex is a structure on the ECG that corresponds to the depolarization of the ventricles. Because the ventricles contain more muscle mass than the atria, the QRS complex is larger than the P wave. In addition, because the His/Purkinje system coordinates the depolarization of the ventricles, the QRS complex tends to look "spiked" rather than rounded due to the increase in conduction velocity. A normal QRS complex is 0.06 to 0.10 sec in duration represented by three small squares or less, but any abnormality of conduction takes longer, and causes widened QRS complexes.

Not every QRS complex contains a Q wave, an R wave, and an S wave. By convention, any combination of these waves can be referred to as a QRS complex.

RT segment

The RT segment connects the QRS complex and the T wave and has a duration of 0.08 to 0.12 sec. It starts at the J point and ends at the beginning of the T wave. However, since it is usually difficult to determine exactly where the ST segment ends and the T wave begins, the relationship between the RT segment and T wave should be examined together. The typical RT segment duration is usually around 0.08 sec

T wave

it 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.

for diagram

http://upload.wikimedia.org/wikipedia/commons/9/9e/SinusRhythmLabels.svg

ISHA KUMARI

Cool goIITian

Joined: 25 Aug 2007

Posts: 83

22 Apr 2008 16:31:27 IST

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inverted t wave may indicate the case of ectopic pace maker{i.e. pace maker other than sa node}

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