PDA

RE: PDA

Joyce Whitehead — Sat, 26 Jan 2019 08:48:57 GMT

Yes we had a reverse sHunter with polycythaenia too. It did have slightly muddy membranes on her back end and bright pink at the front. We also managed her with blood letter but sadly she only got to 18 months before deteriorating so much the owners decided not to go on. A Labrador in this case.

RE: PDA

Sarah Keir — Sat, 26 Jan 2019 06:28:59 GMT

It was if you knew what you were looking for as its PCV was well controlled on hydroxyurea and occasional blood letting.

RE: PDA

David Mills — Fri, 25 Jan 2019 23:34:42 GMT

[quote user="Sarah Keir"]

Just to confuse things, I have seen a case of reverse PDA with consequential polycythaemia! The dog had made it to 8 years old and relatively symptom free!

[/quote]

Was it red up front and blue at the back?

RE: PDA

Sarah Keir — Fri, 25 Jan 2019 22:56:48 GMT

Just to confuse things, I have seen a case of reverse PDA with consequential polycythaemia! The dog had made it to 8 years old and relatively symptom free!

RE: PDA

Anthony Dennison — Fri, 25 Jan 2019 12:06:11 GMT

Yes, the left.

RE: PDA

Tomas B — Wed, 23 Jan 2019 17:15:36 GMT

"Over time the myocardium overstretches and fails, like in DCM (sort of)."

The left or right?

Logically, it would be left side, since there is a lot of fluid from pulmonary veins and there is more blood to pump

RE: PDA

Tomas B — Wed, 23 Jan 2019 17:11:55 GMT

Oh. I get it now!

Of course, the semilunar valves would do their job and close the blood circulation. I get it now.

It comes from FLuid overload.

Thank you very much David

RE: PDA

David Mills — Wed, 23 Jan 2019 00:17:38 GMT

[quote user="Tomás Basto"]the blood supposedly would go from the aorta to RA from pulmonary trunk [/quote]

No the connection is between the pulmonary artery and aorta. The pulmonary artery has a valve like the aorta so blood flowing to it from the aorta will only reach the RA briefly during systole.

The left side fails because of VOLUME overload - all the blood deposited into the PA goes through lungs and back to left side of heart. More than should. Over time the myocardium overstretches and fails, like in DCM (sort of).

[quote user="Tomás Basto"]hat is the funciton of the right aortich arch before birth and where is its precisely location, to leave the apex of the heart i am not guessing its origin[/quote]

http://www.vetstreet.com/care/persistent-right-aortic-arch-vascular-ring-anomaly-in-dogs-and-cats

RE: PDA

Alistair Graham-Evans — Tue, 22 Jan 2019 22:24:20 GMT

You can get both conditions in the one animal !

RE: PDA

Tomas B — Tue, 22 Jan 2019 16:23:47 GMT

Thank you so much to both. Major help here

But still 2 questions:

Since the aorta is a major vessel with higher flow rate, the blood supposedly would go from the aorta to RA from pulmonary trunk (L-R shunt) its much more obvious than deoxygenated blood from the pulmonary trunk going to the aorta (i know it still happens, but its not that clear to me) so, if i think of it that way, i would have CHF right sided i guess.- i am totally confused when i study about hypertension and i have seen so much places where they talk about right side failure as its origin and other where is the left side...I try to imagine the flow of the blood trough the heart in my head but sometimes this little "things" dont seem to make sense

The second question: what is the funciton of the right aortich arch before birth and where is its precisely location, to leave the apex of the heart i am not guessing its origin

Thank you so much

RE: PDA

David Mills — Fri, 18 Jan 2019 22:54:21 GMT

[quote user="Iva Mayer"]

I will try to keep it simple (cardiology is not really my "piece of cake"). PDA is embrionary structure (basically additional vessel ) between aorta and pulmonary artery and results in significant shunting of blood from the descending aorta to the pulmonary artery (left to right) the result is a continuous murmur and volume overload of the pulmonary arteries and veins, left atrium, and left ventricle. PRAA -esophagus and trachea at the level of the heart base are encircled by the persistent arch on the right, by the ligamentum arteriosum on the left and dorsally, and by the base of the heart ventrally. It does not impact the circulation of the blood , and clinically there is no heart murmur. Hope I helped at least a bit

[/quote]

Yes pretty much this.

PDA - failure of closure of ductus arteriosus after birth leading to left to right shunting throughout cycle and the classic washing machine murmur throughout diastole/systole. Eventually CHF left sided by volume overload.

PRAA - failure of regression right aortic arch in foetal development before birth, normal leaving a residual no-functional connection which traps the oesophagus. Signs normally once animals on solid food, regurgitation, easy to see with barium study. No effect on circulation at all.

RE: PDA

Iva Mayer — Fri, 18 Jan 2019 22:42:32 GMT