Talk:Diastole

Comments

1.Mathematical expressions of [systole] are well described and readily and inexpensively volumetrically imaged as ejection fraction (EF), stroke volume (stV), end systolic volume (ESV) and minimum volume [minV]. 2. [Adolph Fick] first built the foundations of this work defined as [Cardiac Output]. 3. Each of these determinants applied to diastole can be mathematecally inverted and literally rendered as injection fraction (IF), suction volume (suV), end diastolic volume (EDV) and maximum volume [maxV]. 4.Prior discussion regarding [Windkessel] physiology becomes important to a literal rendering of [Diastole]. 5.Windkessel theory suggests diastole is not a relaxation phase and further suggests a counterdistribution of blood mass directed by the brainstem down the opposing thoracic spinal accessory ganglia and vagus neural networks. 6. Transthoracic PQRS waves are an amplified signal of the sinoatrially internally triggered pathway that best represents systole. 7. Posit TS waves deserve closer inspection for evidence of an electrically active (diastolic] [mirror] background [EKG]. 8. Ejection Fraction = ESV/EDV. 9. Inverted [Injection Fraction] = EDV/ESV. 10. Wiggers plotting of these determinants is anticipated.--Lbeben (talk) 03:27, 26 April 2008 (UTC)

Wiki Education Foundation-supported course assignment

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QRS wave?

The Systole (medicine) page has a QRS wave and indicates that systole occurs at QRS. It would be good to have the equivalent for Diastole. --Irrevenant [ talk ] 04:57, 12 April 2008 (UTC)

[PQRS] signature represents a [noninvasive] inexpensive [iatrogenic] interpretation of [sympathetic] polarization of the [Purkinge] cells and fibers in Systole (medicine). ST (U?) signature represents [parasympathetic] repolarization governed by the cardiac vagal branches and thoracic spinal accessory nerves in Diastole (medicine). Given we have two opposed electrical operating systems in the heart with only one on radar, we should consider dampening the first order to allow amplification of the second, then consider integration of the two towards a more meaningful EKG.--Lbeben (talk) 00:38, 28 July 2008 (UTC)

Diastolic Suction

To Zizanie13 (who says "...heart creating suction to "pull" blood into it. This isn't actually true."), Heart does suck the blood into the ventricle in early refilling phase. The atrium kick only contribute to <30% of filling in healthy adult. If you read the old classic paper The suction pump mechanism is well-known among cardiologists. Even more, if you take a look into the attached figure Wiggers_Diagram.svg, in the isovolumic relaxation phase, the pressure (blue line) drops first, then the volume increase later in the rapid inflow phase. http://en.wikipedia.org/wiki/File:Wiggers_Diagram.svg The fact that the diastolic pressure changes before the volume change proves the heart is a suction pump. If it is passive filling by momentum, the pressure will not drop before the volume change. (FYI, a filling process will have pressure rise first then volume increase, which is not the case in the isovolumic relaxation phase of Wiggers_Diagram.svg) ps. You are right, no muscle contract during the diastole. The elastic energy was stored in Torrent Guasp myocardial band/elastin/titin or other tissues. Next time, when you edit Wiki, please try to find a reference instead of inventing wrong knowledge with your own reasoning. I really feel bad when people says "Wikipedia is not based on fact." Therefore, let's discuss based on fact. Thank you.

This page talks about the heart creating suction to "pull" blood into it. This isn't actually true. The body is conservative with energy usage, and expending energy to try to fill the heart is not needed if it will fill on its own. The volume of blood flowing into the heart has much more mass than the myocardium, and energetically, it uses the momentum of that mass to fill the heart as it flows in from the previous systolic phase. At end diastole, where there is the "atrial kick", the atrium functions to "cinch up" the heart around the blood, much like pulling a sock up around your ankle, just before the ventricle expends energy to contract. In addition, muscle only has power when contracting. Limbs all have flexor and extensor groups to create a full range of motion. The heart only has the power to contract, not expand. --Zizanie13 (talk) 19:02, 14 January 2009 (UTC)

A fascinating observation. Study of static measures of incoming and outgoing mass differential certainly has merit in further discussion. Would not the incoming blood mass then create an illusion of suction as an incoming blood bolus fills the ventricles? Evidence argues against diatole as a passive phase. Disagree that forces of the myocardium may only contract, not expand. Look more closely at the histology of the crisscrossed myofibrils of the myocardium. Forces generated by this arrangement have origins and insertions going in and out of the great vessels and are looped many times towards this purpose. This arrangement readily lends itself to [Angular Velocity] in generating [force]. Read [Torrent-Guasp] and the myocardial band. Read the European [Windkessel] theory of diastole. Read the physiology of electrical control of the heart by the [sympathetic nervous system] versus the [parasympathetic nervous system]. "Atrial kick" seems important in new onset [atrial fibrillation] but less so when well compensated. --lbeben 00:12, 19 May 2009 (UTC) —Preceding unsigned comment added by Lbeben (talk • contribs)

Couldn't the suction come from the negative pressure in the chest cavity with leverage from the ribs ?GeeBIGS (talk) 02:28, 4 November 2012 (UTC)

Perhaps another way to look at this would be an analogy to a bow and at least one string. Within, a bow is endowed with coil and recoil. When released, a bow contracts to the utmost to propel a projectile. Once thrown to the winds, the bowstring relaxes, forcibly. Seen as the myocardium, both phases appear to consume considerable cellular resources. Historically, Diastole is a "gathering" of the web of living cardiomyocytes that move blood in and out of the heart. Gathering of many bowstrings under torque is a noisy and boisterous phenomena apparently augmented by an "atrial kick" that sets up the next Systole. Once the terms passive and relaxation are set aside, diastole may be better understood. If Coil represents EF, Recoil is the mirror image in Injection Fraction.

References

Pronunciation?

How is it pronounced? It should be in the first sentence. —Preceding unsigned comment added by 99.255.162.25 (talk) 19:21, 19 April 2009 (UTC)

--

I am a native speaker of the Greek language and with your permission, I wanted to add that the Greek word is spelled "Διαστολή" and the best I can describe how it is pronounced is "Thee-ah-stoh-lee" with an emphasis on the final "ee", hence the accent mark -ή on the final (vowel) letter. Thank you, Dimitrios P. - Athens Greece. — Preceding unsigned comment added by 38.107.99.210 (talk) 18:24, 15 June 2011 (UTC)

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Merge with systole and Cardiac cycle

Should like to propose merging the articles on 'systole' and 'diastole' with 'cardiac cycle' for the following reasons: Both of these are already covered in Cardiac cycle with not much difference. By being in one place a comparative overview would be possible. Iztwoz (talk) 13:01, 24 December 2013 (UTC)

Peer Review

-the lead section is easily understood and well-written, but I am not sure if the last sentence really fits -I would rename the section “inside the heart” to “cardiac cycle”, which is what it talks about -the section -the tone of the article is neutral, and the images are very helpful -reference 4 needs a citation, reference 1 is not a reliable source Nhose711 (talk) 03:51, 28 February 2017 (UTC)

Ideas for Improvement

Thank you for your input, I will look into making those changes, and making sure the references are reliable. The last sentence of the introduction, "Diastole is closely related to the phenomenon of recoil within ballistics" does not have a reference so I have been trying to find more information on this practice, ballistocardiography. If I cannot find a reference, I will remove the sentence. Also, I made the last section, "effects of impaired diastolic function" but I do not think this is the best title. I added a section about BNP which I thought was interesting but I am not sure how informative those 2 sentences are. --Rorazi (talk) 13:32, 3 March 2017 (UTC)