Name: adult mouse venous hypertension model: common carotid artery to external jugular vein anastomosis.
Uploaded: 2015-01-27T13:00:00
Description: Watch this Scientific Journal Video about Adult Mouse Venous Hypertension Model: Common Carotid Artery to External Jugular Vein Anastomosis. at JoVE.com

This project is partially supported by NIH T32 GM008440 to Espen Walker, R01 NS27713 to William L.Young, P01 NS44155 to William L.Young&#160; and Hua Su, R21 NS070153 to Hua SU and by the American Heart Association&#160; AHA 10GRNT3130004 to Hua Su. Dr Ana Rodr&#237;guez-Hern&#225;ndez is supported by a grant from &#8220;Obra Social La Caixa&#8221;

1. Preparing the Mouse
<ol>
	<li>Induce general anesthesia in the mouse with isoflurane gas. Inject 0.15 ml of intraperitoneal brupenorphine for pain management. Before proceeding, check if the anesthesia level is satisfactory by pricking the mouse&#39;s paws.</li>
	<li>Put the mouse in dorsal recumbency&#160;with the four limbs fixed by adhesive tape. Remove the hair of the neck and the upper chest with scissors. Via subcutaneous injection, administer 0.2-0.4 ml of 0.9% saline to keep the mouse hydrated during the sur...

<ol>
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Sustained cerebral venous hypertension has been closely related with more severe clinical manifestations and poor prognosis in patients with dural AVFs and brain AVMs3. These effects of CVH have been widely studied in rat models1,2,8. An equivalent model in the mouse would allow the use of genetically modified animals which would ultimately allow the analysis of molecular pathways involved on the pathogenesis of venous hypertension and its relationship with dural AVF and brain AVM.
<p class="jov...

Animal models of cerebral venous hypertension have proved to be a key tool in the understanding of the pathophysiology of brain arteriovenous malformations and arteriovenous fistulas1-7. The most widely used is the rat model created through an artificial fistula between the common carotid artery (CCA) and the external jugular vein (EJV), which provokes a consistent cerebral venous hypertension (CVH) in the rat1,8-10. Equivalent mice models, by opening the possibility of using different transgenic mice strains, would allow further study on not only pathophysiology but also potential genetic therapies for these cerebrovascular diseases. Furthermore, the experimental construct could also be further adapted to the study of other cerebrovascular diseases related with venous hypertension such as migraine, transient global amnesia, transient monocular blindness, etc.11 However, previous attempts to construct these mice models have demonstrated the difficulties with patency of the fistula due to the diminutive anatomy5,12. Here, we describe our step-by-step protocol for a successful anastomosis of the murine CCA and EJV that translates into a long-term patent fistula and a durable venous hypertension in the mouse.

<table border="1" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>10-0 Sterile Microsuture</td>
			<td>Arosurgical Ic.</td>
			<td>VT5A010Q10</td>
		</tr>
		<tr>
			<td>11-0 Sterile Microsuture</td>
			<td>Arosurgical Ic</td>
			<td>VT4A00N07</td>
		</tr>
		<tr>
			<td>DUROTIP Scissors</td>
			<td>Aesculap</td>
			<td>BC210R</td>
		</tr>
		<tr>
			<td>Micro-Adson Tissue Forceps</td>
			<td>Aesculap</td>
			<td>BD510R</td>
		</tr>
		<tr>
			<td>Microscissors</td>
			<td>Aesculap</td>
			<td>OC496R</td>
		</tr>
		<tr>
			<td>Micro Forceps #5 Jewelers</td>
			<td>Aesculap</td>
			<td>BD331R</td>
		</tr>
		<tr>
			<td>Angled Jewelers Forceps</td>
			<td>Aesculap</td>
			<td>BD329R</td>
		</tr>
		<tr>
			<td>Micro Suture Forceps</td>
			<td>Aesculap</td>
			<td>BD338R</td>
		</tr>
		<tr>
			<td>DUROGRIP Needle Holder</td>
			<td>Aesculap</td>
			<td>BM009R</td>
		</tr>
	</tbody>
</table>

adult mouse venous hypertension model: common carotid artery to external jugular vein anastomosis.

The understanding of the pathophysiology of brain arteriovenous malformations and arteriovenous fistulas has improved thanks to animal models. A rat model creating an artificial fistula between the common carotid artery (CCA) and the external jugular vein (EJV) has been widely described and proved technically feasible. This construct provokes a consistent cerebral venous hypertension (CVH), and therefore has helped studying the contribution of venous hypertension to formation, clinical symptoms, and prognosis of brain AVMs and dural AVFs. Equivalent mice models have been only scarcely described and have shown trouble with stenosis of the fistula. An established murine model would allow the study of not only pathophysiology but also potential genetic therapies for these cerebrovascular diseases.
We present a model of arteriovenous fistula that produces a durable intracranial venous hypertension in the mouse. Microsurgical anastomosis of the murine CCA and EJV can be difficult due to diminutive anatomy and frequently result in a non-patent fistula. In this step-by-step protocol we address all the important challenges encountered during this procedure. Avoiding excessive retraction of the vein during the exposure, using 11-0 sutures instead of 10-0, and making a carefully planned end-to-side anastomosis are some of the critical steps. Although this method requires advanced microsurgical skills and a longer learning curve that the equivalent in the rat, it can be consistently developed.
This novel model has been designed to integrate transgenic mouse techniques with a previously well-established experimental system that has proved useful to study brain AVMs and dural AVFs. By opening the possibility of using transgenic mice, a broader spectrum of valid models can be achieved and genetic treatments can also be tested. The experimental construct could also be further adapted to the study of other cerebrovascular diseases related with venous hypertension such as migraine, transient global amnesia, transient monocular blindness, etc.

A successful outcome of the model is a patent arteriovenous fistula that induces venous hypertension in the murine brain. To validate the model we initially measured the intracranial venous pressure in the sagital sinus of the mice at 2, 3 and 4 weeks after surgery. 6 different mice were assigned to every time group. The sinus pressure was 8.8 &#177; 1.2 mmHg in the group measured two weeks after the surgery. In the 6 mice measured 3 weeks after surgery, the sinus pressure was 4.7 &#177; 1.4 mmHg. Finally, the 6 mice mea...

Watch this Scientific Journal Video about Adult Mouse Venous Hypertension Model: Common Carotid Artery to External Jugular Vein Anastomosis. at JoVE.com

Adult Mouse Venous Hypertension Model: Common Carotid Artery to External Jugular Vein Anastomosis. (Video) | JoVE

We describe a method for creating a reliable model of cerebral venous hypertension in the adult mouse. This model has been widely described and tested in the rat. This new counterpart in the mice opens the possibility of using genetic modified animals and thereby broadens the applications of the model.

Adult Mouse Venous Hypertension Model: Common Carotid Artery to External Jugular Vein Anastomosis.

The understanding of the pathophysiology of brain arteriovenous malformations and arteriovenous fistulas has improved thanks to animal models. A rat model ...

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