Name: induction and phenotyping of acute right heart failure in a large animal model of chronic thromboembolic pulmonary hypertension
Uploaded: 2022-03-17T13:00:00
Description: Watch this Scientific Journal Video about Induction and Phenotyping of Acute Right Heart Failure in a Large Animal Model of Chronic Thromboembolic Pulmonary Hypertension at JoVE.com

This work is supported by a public grant overseen by the French National Research Agency (ANR) as part of the&#160;Investissements d&#39;Avenir Program (reference: ANR-15RHUS0002).

The study complied with the principles of laboratory animal care according to the National Society for Medical Research and was approved by the local ethic committee for animal experiments at Hospital Marie Lannelongue.
1. Chronic thromboembolic PH
<ol>
	<li>Induce chronic thromboembolic PH as previously described6,12.</li>
	<li>Briefly, induce a model of chronic thrombo-embolic PH in around 20 kg large white pigs (sus scrofa</em...

<ol>
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We describe a method to model major pathophysiological features of ARHF on chronic PH in a large animal model including volume and pressure overload and hemodynamic restoration with dobutamine. We also reported how to acquire hemodynamic and imaging data to phenotype the dynamic changes of the right ventricle at each condition created during the protocol. These methods can provide background data to build up future research protocols in the field of ARHF, particularly regarding fluid management and inotropic support....

Acute right heart failure (ARHF) has been recently defined as a rapidly progressive syndrome with systemic congestion resulting from impaired right ventricular (RV) filling and/or reduced RV flow output1. ARHF may occur in several conditions such as left-sided heart failure, acute pulmonary embolism, acute myocardial infarction or pulmonary hypertension (PH). In the case of PH, ARHF onset is associated with a 40% risk of short-term mortality or urgent lung transplantation2,3,4. Here, we describe how to create a large animal model of ARHF in the setting of chronic pulmonary hypertension and how to evaluate the right ventricle using echocardiography and pressure-volume loops.
Pathophysiological features of ARHF include RV pressure overload, volume overload, a decrease in RV output, an increase in central venous pressure and/or a decrease in systemic pressure. In chronic PH, there is an initial increase in RV contractility allowing to preserve cardiac output despite the increase in pulmonary vascular resistance. Therefore, in the context of ARHF on chronic PH, the right ventricle can generate nearly isosystemic pressures, particularly under inotropic support. Taken together, ARHF on chronic PH and hemodynamic restoration with inotropes lead to the development of acute RV ischemic lesions, as recently described in our large animal model5. The increase in inotropes creates an increased energetic demand that may further develop ischemic lesions, and finally lead to the development of end-organ dysfunction and poor clinical outcomes. However, there is no consensus about how to manage patients with ARHF on PH, mainly regarding fluid management, inotropes and the role of extra-corporeal circulatory support. Consequently, a large animal model of acute right heart failure may help to provide pre-clinical data on ARHF clinical management.
As a first step to quantify the response to therapy, simple and reproducible methods to phenotype the right ventricle are needed. To date, there is no consensus about how to better phenotype the RV morphology and function of patients with ARHF. The gold standard method to evaluate RV contractility (i.e., intrinsic capacity to contract) and ventriculo-arterial coupling (i.e., contractility normalized by ventricular afterload; an index of ventricular adaptation) is the analysis of pressure-volume (PV) loops. This method is twice invasive because it requires right heart catheterization and a transient reduction in RV preload using a balloon inserted in the inferior vena cava. In clinical practice, non-invasive and repeatable methods to evaluate the right ventricle are needed. Cardiac magnetic resonance (CMR) is considered as the gold standard for non-invasive evaluation of the right ventricle. In patients with ARHF on chronic PH who are managed in intensive care unit (ICU), the use of CMR may be limited because of the patient&#39;s unstable hemodynamic condition; moreover, repeated CMR evaluations, several times a day, including at night, may be limited because of its cost and limited availability. Conversely, echocardiography allows non-invasive, reproducible and low-cost RV morphology and function evaluations in ICU patients.
Large animal models are ideal to perform preclinical studies focusing on the relationship between invasive hemodynamic parameters and non-invasive parameters. The large white pig anatomy is close to humans. Consequently, most of the echocardiographic parameters described in humans are quantifiable in pigs. Some minor variations exist between human and pig heart that must be taken into account for echocardiographic studies. Pigs present a constitutional dextrocardia and a slightly counterclockwise rotation of the heart axis. As a result, the apical 4-chamber view becomes an apical 5-chamber view and the acoustic window is situated below the xiphoid appendix. Additionally, parasternal long and short axis views acoustic windows are situated on the right side of the sternum.
Here, we describe a novel method to induce ARHF in a large animal model of chronic thromboembolic PH and to restore hemodynamic using dobutamine. We also report RV ischemic lesions present in the model within 2&#8722;3 hours after hemodynamic restoration with dobutamine. Moreover, we describe how to acquire RV PV-loops and echocardiographic RV parameters at each condition providing insights on the dynamic changes in RV morphology and function. As the large animal model of chronic thromboembolic PH and the PV-loop methods were previously described6, these sections will be briefly described. Also, we reported results of echocardiographic evaluations which are deemed potentially difficult in porcine models. We will explain the methods to achieve repeated echocardiographic in the model.
The model of ARHF on chronic PH reported in this study can be used to compare different therapeutic strategies. The methods of RV phenotyping can be used in other large animal models mimicking clinically relevant situations such as acute pulmonary embolism7, RV myocardial infarction8, acute respiratory distress syndrome9 or right heart failure associated with left ventricular failure10 or left ventricular mechanical circulatory support11.

<table border="0" cellpadding="0" cellspacing="0" style="width:911px;" width="910">
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		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="40">
			<td height="40" style="height:40px;width:215px;">Radiofocus Introducer II</td>
			<td style="width:123px;">Terumo</td>
			<td style="width:344px;">RS+B80K10MQ</td>
			<td style="width:229px;">catheter sheath</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Equalizer, Occlusion Ballon Catheter</td>
			<td>Boston Scientific</td>
			<td>M001171080</td>
			<td>ballon for inferior vena cava occlusion</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Guidewire</td>
			<td>Terumo</td>
			<td>GR3506</td>
			<td>0.035; angled</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Vigilance monitor</td>
			<td>Edwards</td>
			<td>VGS2V</td>
			<td>Swan-Ganz associated monitor</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Swan-Ganz</td>
			<td>Edwards</td>
			<td>131F7</td>
			<td>Swan-Ganz catheter 7 F; usable lenghth 110 cm</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Echocardiograph; Model: Vivid 9</td>
			<td>General Electrics</td>
			<td>GAD000810 and H45561FG</td>
			<td>Echocardiograph</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Probe for echo, M5S-D</td>
			<td>General Electrics</td>
			<td>M5S-D</td>
			<td>Cardiac ultrasound transducer</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">MPVS-ultra Foundation system</td>
			<td>Millar</td>
			<td>PL3516B49</td>
			<td>Pressure-volume loop unit; includes a powerLab16/35, MPVS-Ultra PV Unit, bioamp and bridge amp and cables</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Ventricath 507</td>
			<td>Millar</td>
			<td>VENTRI-CATH-507</td>
			<td>conductance catheter</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Lipiodol ultra-fluid</td>
			<td>Guerbet</td>
			<td>306 216-0</td>
			<td>lipidic contrast dye</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">BD Insyte Autoguard</td>
			<td>Becton, Dickinson and Company</td>
			<td align="right">381847</td>
			<td>IV catheter</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Arcadic Varic</td>
			<td>Siemens</td>
			<td>A91SC-21000-1T-1-7700</td>
			<td>C-arm</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;">Prolene 5.0</td>
			<td>Ethicon</td>
			<td style="width:344px;">F1830</td>
			<td style="width:229px;">polypropilene monofil</td>
		</tr>
	</tbody>
</table>

induction and phenotyping of acute right heart failure in a large animal model of chronic thromboembolic pulmonary hypertension

The development of acute right heart failure (ARHF) in the context of chronic pulmonary hypertension (PH) is associated with poor short-term outcomes. The morphological and functional phenotyping of the right ventricle is of particular importance in the context of hemodynamic compromise in patients with ARHF. Here, we describe a method to induce ARHF in a previously described large animal model of chronic PH, and to phenotype, dynamically, right ventricular function using the gold standard method (i.e., pressure-volume PV loops) and with a non-invasive clinically available method (i.e., echocardiography). Chronic PH is first induced in pigs by left pulmonary artery ligation and right lower lobe embolism with biological glue once a week for 5 weeks. After 16 weeks, ARHF is induced by successive volume loading using saline followed by iterative pulmonary embolism until the ratio of the systolic pulmonary pressure over systemic pressure reaches 0.9 or until the systolic systemic pressure decreases below 90 mmHg. Hemodynamics are restored with dobutamine infusion (from 2.5 &#181;g/kg/min to 7.5 &#181;g/kg/min). PV-loops and echocardiography are performed during each condition. Each condition requires around 40 minutes for induction, hemodynamic stabilization and data acquisition. Out of 9 animals, 2 died immediately after pulmonary embolism and 7 completed the protocol, which illustrates the learning curve of the model. The model induced a 3-fold increase in mean pulmonary artery pressure. The PV-loop analysis showed that ventriculo-arterial coupling was preserved after volume loading, decreased after acute pulmonary embolism and was restored with dobutamine. Echocardiographic acquisitions allowed to quantify right ventricular parameters of morphology and function with good quality. We identified right ventricular ischemic lesions in the model. The model can be used to compare different treatments or to validate non-invasive parameters of right ventricular morphology and function in the context of ARHF.

Feasibility 
We describe the results of 9 consecutive procedures of ARHF induction in a large animal CTEPH model previously reported5. The duration of the protocol was around 6 hours to complete, including anesthesia induction, installation, vascular access/catheter placements, induction of volume/pressure overload and hemodynamic restoration, data acquisitions and euthanasia. Each hemodynamic condition requires around 40 minutes to achieve in...

Watch this Scientific Journal Video about Induction and Phenotyping of Acute Right Heart Failure in a Large Animal Model of Chronic Thromboembolic Pulmonary Hypertension at JoVE.com

Induction and Phenotyping of Acute Right Heart Failure in a Large Animal Model of Chronic Thromboembolic Pulmonary Hypertension

We present a protocol to induce and phenotype an acute right heart failure in a large animal model with chronic pulmonary hypertension. This model can be used to test therapeutic interventions, to develop right heart metrics&#160;or to improve the understanding of acute right heart failure pathophysiology.

The development of acute right heart failure (ARHF) in the context of chronic pulmonary hypertension (PH) is associated with poor short-term outcomes. The ...

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