Name: novel approach for simultaneous recording of renal sympathetic nerve activity and blood pressure with intravenous infusion in conscious, unrestrained mice.
Uploaded: 2018-02-14T12:30:00.000+00:00
Duration: 11 min 8 s
Description: Watch this Scientific Journal Video about Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice. at

S.M.H. 건강 연구 (CIHR), 심장 및 스트로크 재단의 캐나다 (HSFC) 및 앨버타 혁신적인 건강 솔루션 (AiHS);에 대 한 캐나다 기관에서 박사 장학금에 의해 지원 되었다 J.E.H.는 국가 심 혼, 폐 및 혈액 연구소 PO1HL-51971에서 교부 금에 의해 지원 됩니다.

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	<li>Young, C. N., Davisson, R. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+assessment+of+neurocardiovascular+regulation+in+the+mouse:+principles,+progress,+and+prospects.">In vivo assessment of neurocardiovascular regulation in the mouse: principles, progress, and prospects.</a> Am J Physiol Heart Circ Physiol. 301 (3), H654-H662 (2011).</li><li>Kass, D. A., Hare, J. M., Georgakopoulos, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Murine+cardiac+function:+a+cautionary+tail.">Murine cardiac function: a cautionary tail.</a> Circ Res. 82 (4), 519-522 (1998).</li><li>Charkoudian, N., Wallin, B. 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저자는 공개 없다.

여기 우리 설명, 시연 하 고 의식 마우스, 이동 하 고 그들의 홈 장에서 편안 하 게 휴식 무료에서 방사선학의 대상된 평가 대 한 새로운 방법을 확인. 동맥 압력 radiotelemeter, 내재 주입 정 맥 카 테 터와 맞춤형 바이 폴라 방사선학 전극의 외과 주입, 다음 마우스 수술에서 회복 하 고 48-72 시간에 그대로 남았다. 마우스 편안 하 게 정착 남아 새 장에 그들의 가정 (를 포함 하 여 실험 기간) 항상 음식, ...

생물 의학 연구의 여러 영역에서 마우스를 사용 하 여 관심 수많은 유전자 조작된 모델의 개발을 확장 하 고 있습니다. 대부분의 경우, 기술 진보는 생리학에서 마우스의 사용 증가와 속도 유지 그리고 지금 쥐에 있는 중요 한 생리 적 파라미터 측정을 위해 특별히 개발 된 소형된 장치의 인상적인 선택을. 비록 telemetric 장치에 대 한 직접 측정의 자율 의식 쥐에서 신경 톤 10 년 동안 사용할 수 있다, 의식 쥐의 신경 활동을 평가 하기 위한 소형된 장치는 현재 사용할 수 없습니다. 조사는 일반적으로 간접 방법 (플라즈마 또는 소변 catecholamines, 약리 자율 봉쇄, 혈액의 패턴의 스펙트럼 분석으로 자율 신 경계에의 기여를 평가 하 여이 제한을 회피합니다 압력/심장 박동)1.
이러한 접근 귀중 한 정보를 제공 하는 동안 결과 고립 된 인구 조사 현상에 신경의의 개별 기여를 공개 하는 것 보다는 전반적인 자율 톤의 세계적인 사진입니다. 또는, 특정 신경에서 활동의 직접 녹음 처형 되었습니다 마 취 쥐에는 다양 한 문제를 포즈. 시간 수술을 다음과 같은 몇 가지에 대 한 마 취 마우스에 생리 적 범위 내에서 안정 된 혈압을 유지 하는 것이 상당히 어렵습니다. 사실, 이러한 유형의 실험에서 혈압은 종종 unreported 또는 매우 낮은 수준에서 (즉, 60-80 mmHg 대 > 의식 마우스에서 100mmHg)2. 전시에 마 취 마우스 종종 심장 혈관 시스템의 취약성 걸로 하겠습니다 혈압과 공감 톤3, 간의 종속 관계를 주어 자율 신경 활동의 의미 있는 평가 4.
이 한계를 의식에서 신장 교감 신경 활동 (방사선학)의 직접 녹음에 대 한 새로운 방법을 해결 하기 위해 억제 쥐, 그대로 자신의 집 새 내에서 개발 되었다. 모두이 기술의 성공적인 구현에 대 한 수술 및 실험 방법을 자세히 설명 합니다. 이 준비는 동시에 정 맥 마우스를 방해 하지 않고 관심의 에이전트에 추가 기능이 있는 방사선학, 뿐만 아니라 radiotelemetry 통해 동맥 압력 기록 조사 수 있습니다.
24 시간 수술 후 마우스 정상적으로 동작 하 고 통증이 나 조 난의 표시를 전시 하지 않습니다. 다음 실험 녹음은 마우스 위에 편안 하 게 음식, 물, 환경 농축에 대 한 무제한 액세스를 가정 그것의 감 금에서 동안 수술 후 48-72 시간을 시작할 수 있습니다. 명확한 방사선학 추적 표시 됩니다 하 고 (예: 식사 및 정리) 동물의 정상적인 신체 움직임에이 신경 인구의 특성 응답 조직 혈압의 약리 변조 뿐만 아니라 시연. 품질 및 방사선학 신호의 특이성 더 절 봉쇄에 의해 유효성이 검사 됩니다. 이 원고는이 기술은5의 처음 게시 된 설명에 시청각 보완 포함 되어 있습니다.

<table><tbody><tr><td>Teflon-coated stainless steel multiple stranded wire</td><td>A-M Systems</td><td>793200</td><td>0.001in diameter bare; 0.0055in diameter coated</td></tr><tr><td>#11 Scalpel Blade</td><td>Fisher Scientific</td><td>ALMM9011</td><td></td></tr><tr><td>Soldering Iron and solder</td><td></td><td></td><td>Any make or model suitable</td></tr><tr><td>Male miniature pin connectors</td><td>A-M Systems</td><td>520200</td><td>Brass with gold plating</td></tr><tr><td>Female miniature pin connectors</td><td>A-M Systems</td><td>520100</td><td>Brass with gold plating</td></tr><tr><td>Heat Shrink tubing</td><td>Radio Shack</td><td>Model #: 278-1610 |&amp;nbsp;Catalog #: 2781610</td><td>1.6 mm diameter</td></tr><tr><td>Polyethylene 90 (PE90) tubing</td><td>VWR</td><td>CA-63018-703</td><td>0.86mm inner diameter; 1.27mm outer diameter</td></tr><tr><td>Dissecting microscope</td><td>Leica Microsystems</td><td>Leica M80</td><td>Any make or model also suitable</td></tr><tr><td>Polyethylene 10 (PE10) tubing</td><td>Braintree Scientific</td><td>PE10&amp;nbsp;50 FT</td><td>0.28mm inner diameter; 0.61mm outer diameter</td></tr><tr><td>Super Glue Liquid</td><td>Loctite</td><td>n/a</td><td>Liquid Formula; any brand suitable</td></tr><tr><td>Super Glue Gel</td><td>Loctite</td><td>n/a</td><td>Gel Formula; any brand suitable</td></tr><tr><td>Polyethylene tubing</td><td>Scientific Commodities</td><td>BB31695-PE/13</td><td>For pedestal 2.7mm inner diameter; 4.0mm outer diameter</td></tr><tr><td>Hospital Sterilization Services &amp;amp; Ozone Sterilization packets</td><td></td><td></td><td>Contact local hospital sterilization services</td></tr><tr><td>Isoflurane anesthesia</td><td>Abbott</td><td>05260-05</td><td></td></tr><tr><td>Deltaphase isothermal heat pads &amp;amp; surgical table</td><td>Braintree Scientific</td><td>39OP</td><td>Keep heat pads warm in a 37&amp;deg;C water bath; Corresponding surgical table essential</td></tr><tr><td>Glycopyrrolate</td><td>Amdipharm Mercury Company Limited</td><td>n/a</td><td></td></tr><tr><td>Isoflurane vaporizer system &amp;amp; flow gauge</td><td>Braintree Scientific</td><td>VP I</td><td>Include medical grade oxygen supply</td></tr><tr><td>Tissue scissors</td><td>Fine Science Tools</td><td>14173-12</td><td></td></tr><tr><td>Fine spring scissors</td><td>Fine Science Tools</td><td>15006-09</td><td></td></tr><tr><td>Small cotton-tipped applicators</td><td>Fisher Scientific</td><td>23400100</td><td></td></tr><tr><td>Fine Straight Forceps</td><td>Fine Science Tools</td><td>11254-20</td><td>#5, FST by Dumont Biologie Tip</td></tr><tr><td>Angled Forceps</td><td>Fine Science Tools</td><td>11251-35</td><td>#5/45 FST by Dumont</td></tr><tr><td>Small Absorbent Spears</td><td>Fine Science Tools</td><td>18105-03</td><td></td></tr><tr><td>Parafilm</td><td>Sigma Aldrich</td><td>BR701605&amp;nbsp;ALDRICH</td><td></td></tr><tr><td>Kwik-Sil 2 component Silicone Polymer</td><td>World Precision Instruments (WPI)</td><td>KWIK-SIL</td><td>Purchase extra specialized tips from WPI</td></tr><tr><td>5-0 Polysorb Suture</td><td>Tyco Healthcare</td><td>n/a</td><td></td></tr><tr><td>6-0 Silk Suture</td><td>Braintree Scientific</td><td>SUT-S&amp;nbsp;104</td><td>Deknatel brand, spool</td></tr><tr><td>Radiotelemetry Probe</td><td>Data Sciences International (DSI)</td><td>TA11-PAC10</td><td></td></tr><tr><td>Radiotelemetry Receiver</td><td>Data Sciences International (DSI)</td><td>PhysioTel RPC-1</td><td></td></tr><tr><td>Ambient Pressure Reference</td><td>Data Sciences International (DSI)</td><td>Apr-01</td><td></td></tr><tr><td>Pressure Output Adapter</td><td>Data Sciences International (DSI)</td><td>R11CPA</td><td></td></tr><tr><td>Rena Pulse Tubing</td><td>Braintree Scientific</td><td>RPT-040</td><td></td></tr><tr><td>Infusion Swivel</td><td>Instech Solomon</td><td>375/D/22</td><td></td></tr><tr><td>Swivel Support Arm &amp;amp; Mount</td><td>Instech Solomon</td><td>SMCLA</td><td></td></tr><tr><td>Polysulfone button&amp;nbsp;</td><td>Instech Solomon</td><td>LW62S/6</td><td></td></tr><tr><td>Stainless steel spring</td><td>Instech Solomon</td><td>PS62</td><td></td></tr><tr><td>Vetbond surgical adhesive</td><td>3M</td><td>n/a</td><td></td></tr><tr><td>Triple Antibiotic Ointment</td><td>Fougera</td><td>n/a</td><td></td></tr><tr><td>PowerLab 8 Channel Data Acquisition System &amp;amp; Software</td><td>ADInstruments</td><td>PowerLab 8/35</td><td></td></tr><tr><td>PVC Insulated Cable</td><td>Belden</td><td>PVC Audio Connection Cable 32 AWG</td><td></td></tr><tr><td>Preamplification Headstage</td><td>Dagan Corporation</td><td>Model 4002</td><td></td></tr><tr><td>Differential Amplifier</td><td>Dagan Corporation</td><td>EX4-400</td><td></td></tr><tr><td>Sodium Nitroprusside</td><td>Sigma Aldrich</td><td>71778-25G</td><td></td></tr><tr><td>Phenylephrine</td><td>Sigma Aldrich</td><td>P6126-5G</td><td></td></tr><tr><td>Sterile Physiological Saline 0.9% NaCl</td><td>Beckton Dickinson</td><td></td><td>Contact local hospital supplier</td></tr><tr><td>hexamethonium</td><td>Sigma Aldrich</td><td>H0879-5G</td><td></td></tr><tr><td>Stainless Steel top anti vibration table</td><td>n/a</td><td>n/a</td><td>Custom designed in-house; Solid steel plate on a benchtop is also suitable</td></tr><tr><td>Faraday cage</td><td>n/a</td><td>n/a</td><td>Custom designed and constructed in-house</td></tr><tr><td>Small animal hair trimmer</td><td>n/a</td><td>n/a</td><td>Drugstore, men&#039;s beard trimmer suitable</td></tr><tr><td>Dipilatory Cream</td><td>n/a</td><td>n/a</td><td>Veet brand, sensitive skin formula</td></tr><tr><td>10% Povidone Iodine</td><td>Purdue Products</td><td>Betadiene</td><td></td></tr><tr><td>70% Ethanol</td><td>n/a</td><td>n/a</td><td></td></tr><tr><td>Steel microretractors</td><td>n/a</td><td>n/a</td><td>Made in-house. Bend a steel paper clip &amp;amp; loop 4-0 silk to form a retractor</td></tr><tr><td>Hemostats</td><td>Fine Science Tools</td><td>13011-12</td><td></td></tr><tr><td>Heat Gun</td><td>Fisher Scientific</td><td>09-201-27</td><td></td></tr></tbody></table>

novel approach for simultaneous recording of renal sympathetic nerve activity and blood pressure with intravenous infusion in conscious, unrestrained mice.

신장 교감 신경 생리 적 및 병 태 생리 현상에 크게 기여 한다. 만성 신장 질환, 고혈압, 심장 마비, 당뇨병, 비만 등 연구의 많은 분야에 큰 관심은 신장 교감 신경 활동 (방사선학) 평가. 교감 신경의 역할의 명확한 평가 따라서 실험 결과의 적절 한 해석 및 질병 과정의 이해에 대 한 필수적입니다. 방사선학은 전통적으로 마 취 설치류, 쥐를 포함 하 여 측정 되었습니다. 그러나, 마우스 일반적으로 전시 매우 낮은 조직 혈압과 hemodynamic 불안정성 몇 시간 동안 마 취와 수술 하는 동안. 방사선학의 의미 해석 교감 신경 음색 및 심장 혈관 상태 사이의 친밀 한 관계를 주어진이 비 생리 적 상태에 의해 혼동 됩니다. 전통적인 접근의 이러한 제한을 해결 하기 위해 우리 의식, 자유롭게 이동 마우스에서 방사선학을 측정 하기 위한 새로운 방법을 개발. 마우스 만성 라디오-telemeters 혈압으로 jugular 정 맥 주입 카 테 터와 방사선학의 직접 녹음에 대 한 사용자 정의 설계 된 양극 전극의 지속적인 모니터링으로 계측 되었다. 48-72 시간 복구 기간에 따라 생존 율 100% 이었고 모든 쥐 행동 일반적으로. 이 시간 포인트에서 방사선학 성공적으로 각각 4와 마우스의 50%와 70%에서 수술 후 5 일 취득 가능한 신호와 마우스의 80%에 기록 되었다. 생리 혈액 압력 모든 쥐에 기록 되었다 (116±2 mmHg, n = 10). 기록 된 방사선학 먹고 정리, 문학에서 확고 한으로 증가. 또한, 방사선학 절 봉쇄 및 약리 작용 혈압의 변조에 의해 확인 되었다. 여기, 의식, 자유롭게 이동 마우스에 방사선학의 명확한 기록에 대 한 효과적이 고 관리 방법을 설명 합니다.

설명 된 프로토콜에 따라 생존 율 100%-모든 쥐가이 연구 살아남 고 잘 수술 절차에 따라 복구에 계측 했다. 수술 준비, 모든 마우스 행동을 일반적으로, 일반적인 식사, 전시 손질 및 예비 동작의 24 시간 이내 아니 동물이 이번에 통증이 나 조 난의 흔적을 보여주었다. 48 시간 수술, 검증 하 고 명확한 방사선학 신호 12 쥐에서 10에 기록 되었다. 그러나이 신호는 수술이 쥐 72 ?...

Watch this Scientific Journal Video about Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice. at

Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.

마 취 쥐 비 생리 조직 혈압, 혈압과 자율 신 경계 사이의 친밀 한 관계를 주어진 자율의 의미 있는 평가 하는 걸로 전시. 따라서, 동시에 기록적인 신장 교감 신경 활동을 의식 쥐의 정 맥 주입 혈압 소설 방법 요약.

신장 동 정적인 신경 활동의 의식, 정 맥 주입 혈압 동시 녹음에 대 한 새로운 접근 방식을 억제 쥐.

Renal sympathetic nerves contribute significantly to both physiological and pathophysiological phenomena. Evaluating renal sympathetic nerve activity ...

novel-approach-for-simultaneous-recording-renal-sympathetic-nerve

Research

JoVE Journal

Medicine

10.1K 조회수.  University of Alberta. 마 취 쥐 비 생리 조직 혈압, 혈압과 자율 신 경계 사이의 친밀 한 관계를 주어진 자율의 의미 있는 평가 하는 걸로 전시. 따라서, 동시에 기록적인 신장 교감 신경 활동을 의식 쥐의 정 맥 주입 혈압 소설 방법 요약.

비디오: Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.

Hyperinsulinemic-euglycemic Clamps in Conscious, Unrestrained Mice

Type 2 diabetes is characterized by a defect in insulin action. The hyperinsulinemic-euglycemic clamp, or insulin clamp, is widely considered the "gold standard" method for assessing insulin action in vivo. During an insulin clamp, hyperinsulinemia is achieved by a constant insulin infusion. Euglycemia is maintained via a concomitant glucose infusion at a variable rate. This variable glucose infusion rate (GIR) is determined by measuring blood glucose at brief intervals throughout the experiment and adjusting the GIR accordingly. The GIR is indicative of whole-body insulin action, as mice with enhanced insulin action require a greater GIR. The insulin clamp can incorporate administration of isotopic 2[14C]deoxyglucose to assess tissue-specific glucose uptake and [3-3H]glucose to assess the ability of insulin to suppress the rate of endogenous glucose appearance (endoRa), a marker of hepatic glucose production, and to stimulate the rate of whole-body glucose disappearance (Rd).
The miniaturization of the insulin clamp for use in genetic mouse models of metabolic disease has led to significant advances in diabetes research. Methods for performing insulin clamps vary between laboratories. It is important to note that the manner in which an insulin clamp is performed can significantly affect the results obtained. We have published a comprehensive assessment of different approaches to performing insulin clamps in conscious mice1 as well as an evaluation of the metabolic response of four commonly used inbred mouse strains using various clamp techniques2. Here we present a protocol for performing insulin clamps on conscious, unrestrained mice developed by the Vanderbilt Mouse Metabolic Phenotyping Center (MMPC; URL: www.mc.vanderbilt.edu/mmpc). This includes a description of the method for implanting catheters used during the insulin clamp. The protocol employed by the Vanderbilt MMPC utilizes a unique two-catheter system3. One catheter is inserted into the jugular vein for infusions. A second catheter is inserted into the carotid artery, which allows for blood sampling without the need to restrain or handle the mouse. This technique provides a significant advantage to the most common method for obtaining blood samples during insulin clamps which is to sample from the severed tip of the tail. Unlike this latter method, sampling from an arterial catheter is not stressful to the mouse1. We also describe methods for using isotopic tracer infusions to assess tissue-specific insulin action. We also provide guidelines for the appropriate presentation of results obtained from insulin clamps.

The hyperinsulinemic-euglycemic clamp, or insulin clamp, is the gold standard for assessing insulin action in vivo. A method for performing insulin clamps in mice is described. This includes a method for arterial catheterization that permits experiments to be performed in conscious, unrestrained mice with minimal stress.

의식 억제 마우스에 인슈린 과다 - euglycemic 클램프

Type 2 diabetes is characterized by a defect in insulin action. The hyperinsulinemic-euglycemic clamp, or insulin clamp, is widely considered the "gold ...

연구

의학

Femoral Arterial and Venous Catheterization for Blood Sampling, Drug Administration and Conscious Blood Pressure and Heart Rate Measurements

In multiple fields of study, access to the circulatory system in laboratory studies is necessary. Pharmacological studies in rats using chronically implanted catheters permit a researcher to effectively and humanely administer substances, perform repeated blood sampling and assists in conscious direct measurements of blood pressure and heart rate. Once the catheter is implanted long-term sampling is possible. Patency and catheter life depends on multiple factors including the lock solution used, flushing regimen and catheter material. This video will demonstrate the methodology of femoral artery and venous catheterization of the rat. In addition the video will demonstrate the use of the femoral venous and arterial catheters for blood sampling, drug administration and use of the arterial catheter in taking measurements of blood pressure and heart rate in a conscious freely-moving rat. A tether and harness attached to a swivel system will allow the animal to be housed and have samples taken by the researcher with minimal disruption to the animal. To maintain patency of the catheter, careful daily maintenance of the catheter is required using lock solution (100 U/ml heparinized saline), machine-ground blunt tip syringe needles and the use of syringe filters to minimize potential contamination. With careful aseptic surgical techniques, proper catheter materials and careful catheter maintenance techniques, it is possible to sustain patent catheters and healthy animals for long periods of time (several weeks).

Chronic catheterization of blood vessels in the rat is often required for administration of substances, obtain blood sample over a period of time or for direct conscious blood pressure measurements. Femoral arterial catheterization of the rat and corresponding measurements of blood pressure in the conscious animal will be demonstrated.

혈액 샘플링, 마약 관리 및 의식 검사 중 혈압과 심장 박동을 측정 대퇴 동맥혈과 정맥 Catheterization

In multiple fields of study, access to the circulatory system in laboratory studies is necessary. Pharmacological studies in rats using chronically ...

Transcutaneous Assessment of Renal Function in Conscious Rodents

Glomerular filtration rate (GFR) is the gold standard to assess overall kidney function. However, traditional methods to evaluate GFR are cumbersome and time-consuming. In addition, serial blood or urine samples are required, with the associated stress for the experimental animals. A recent technique significantly reduces the investment in time and resources, minimizing the invasiveness and the animal stress, but being equally valid as the traditional approaches. The method measures transcutaneously renal function. Using an optical device and the exogenous renal marker fluorescein isothiocyanate (FITC)-sinistrin, this technique is capable of measuring the elimination kinetics of the marker through the skin. With neither blood nor urine samples nor the associated laboratory assays needed, the results of the transcutaneous measurement are almost instantaneously available. The method has been already validated in different species and successfully applied in several models of renal pathology. Moreover, due to its minimally invasive characteristics, it is suitable for sequential measurements within the same animal. Here is provided a detailed protocol to carry out the transcutaneous assessment of renal function in rodents.

Determination of glomerular filtration rate (GFR) is the gold standard to assess overall kidney function. However, traditional procedures to measure this parameter are cumbersome and require a large investment of time. Here we describe a faster and minimally invasive method to determinate GFR transcutaneously.

의식 설치류에서 신장 기능의 경피 평가

Glomerular filtration rate (GFR) is the gold standard to assess overall kidney function. However, traditional methods to evaluate GFR are cumbersome and ...

Quantifying Acute Changes in Renal Sympathetic Nerve Activity in Response to Central Nervous System Manipulations in Anesthetized Rats

Renal sympathetic nerve activity (RSNA) and mean arterial pressure are important parameters in cardiovascular and autonomic research; however, there are limited resources directing scientists in the techniques for measuring and analyzing these variables. This protocol describes the methods for measuring RSNA and mean arterial pressure in anesthetized rats. The protocol also includes the approaches for accessing the brain during RSNA recordings for central nervous system (CNS) manipulations. The RSNA recording technique is compatible with pharmacologic, optogenetic, or electrical stimulation of the CNS. The approach is useful when an investigator will measure short-term (min to h) autonomic responses in non-survival experiments to correlate anatomically with CNS nuclei. The approach is not intended to be used to obtain chronic (survival) recordings of RSNA in rats. Discharges in RSNA, averaged rectified RSNA, and mean arterial pressure can be quantified and analyzed further using parametric statistical tests. Methods for obtaining venous access, recording mean arterial pressure telemetrically, and brain fixation for future histological analysis are also described in the article.

Methods for measuring sympathetic and cardiovascular responses to central nervous system (CNS) manipulations are important for advancing neuroscience. This protocol was developed to assist scientists with measuring and quantifying acute changes in renal sympathetic nerve activity (RSNA) in anesthetized rats (non-survival).

마 취 쥐에서 중앙 신경 조작에 대 한 응답에서 신장 교감 신경 활동에 심각한 변화를 측정

Renal sympathetic nerve activity (RSNA) and mean arterial pressure are important parameters in cardiovascular and autonomic research; however, there are ...

신경과학

Simultaneous Electrocardiography Recording and Invasive Blood Pressure Measurement in Rats

For studies related to cardiovascular physiology or pathophysiology, blood pressure (BP) and electrocardiography are basic observational parameters. Research focusing on cardiovascular disease models, potential cardiovascular therapeutic targets or pharmaceutical agents requires assessment of systemic arterial pressure and heart rhythm changes. In situations where radio telemetry systems are not available or affordable, the technique of femoral artery cannulation is an alternative way to obtain intra-arterial pressure waveform recordings and systemic BP measurements. This technique is economical and can be performed with standard equipment in animal facilities. However, invasive arterial pressure recording requires cannulation of small arteries, which can be a challenging surgical skill. Here, we present step-by-step protocols for femoral artery cannulation procedures. Key procedures include the calibration of the data acquisition system, tissue dissection and femoral artery cannulation, and setup of the arterial cannulation system for pressure recording. Surface electrocardiography recording procedures are also included. We also present examples of BP recordings from normotensive and hypertensive rats. This protocol allows reliable direct recordings of systemic BP with simultaneous electrocardiography.

Here, we describe a setup for simultaneous recording of electrocardiography and intra-arterial blood pressure (BP) in experimental rats, which can be done with standard equipment in animal facilities and can be applied to physiological or pharmacological studies to investigate pathogenic or therapeutic mechanisms in cardiovascular medicine.

동시 심전도 기록 및 침략 적 혈액 압력 측정 쥐에

For studies related to cardiovascular physiology or pathophysiology, blood pressure (BP) and electrocardiography are basic observational parameters. ...

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Blood pressure (BP) and heart rate (HR) are both controlled by the autonomic nervous system (ANS) and are closely intertwined due to reflex mechanisms. The baroreflex is a key homeostatic mechanism to counteract acute, short-term changes in arterial BP and to maintain BP in a relatively narrow physiological range. BP is sensed by baroreceptors located in the aortic arch and carotid sinus. When BP changes, signals are transmitted to the central nervous system and are then communicated to the parasympathetic and sympathetic branches of the autonomic nervous system to adjust HR. A rise in BP causes a reflex decrease in HR, a drop in BP causes a reflex increase in HR.
Baroreflex sensitivity (BRS) is the quantitative relationship between changes in arterial BP and corresponding changes in HR. Cardiovascular diseases are often associated with impaired baroreflex function. In various studies reduced BRS has been reported in e.g., heart failure, myocardial infarction, or coronary artery disease. 
Determination of BRS requires information from both BP and HR, which can be recorded simultaneously using telemetric devices. The surgical procedure is described beginning with the insertion of the pressure sensor into the left carotid artery and positioning of its tip in the aortic arch to monitor arterial pressure followed by the subcutaneous placement of the transmitter and ECG electrodes. We also describe postoperative intensive care and analgesic management. After a two-week period of post-surgery recovery long-term ECG and BP recordings are performed in conscious and unrestrained mice. Finally, we include examples of high-quality recordings and the analysis of spontaneous baroreceptor sensitivity using the sequence method.

The baroreflex is a heart-rate regulation mechanism by the autonomic nervous system in response to blood-pressure changes. We describe a surgical technique to implant telemetry transmitters for continuous and simultaneous measurement of electrocardiogram and blood pressure in mice. This can determine spontaneous baroreflex sensitivity, an important prognostic marker for cardiovascular disease.

의식이 있는 마우스에서 자발적인 압력반사 민감도를 결정하기 위해 결합된 원격 측정 ECG 및 혈압 전송기 이식

Blood pressure (BP) and heart rate (HR) are both controlled by the autonomic nervous system (ANS) and are closely intertwined due to reflex mechanisms. ...

Long-Term Continuous Measurement of Renal Blood Flow in Conscious Rats

The kidneys play a crucial role in maintaining the homeostasis of body fluids. The regulation of renal blood flow (RBF) is essential to the vital functions of filtration and metabolism in kidney function. Many acute studies have been carried out in anesthetized animals to measure RBF under various conditions to determine mechanisms responsible for the regulation of kidney perfusion. However, for technical reasons, it has not been possible to measure RBF continuously (24 h/day) in unrestrained unanesthetized rats over prolonged periods. These methods allow the continuous determination of RBF over many weeks while also simultaneously recording blood pressure (BP) with implanted catheters (fluid-filled or by telemetry). RBF monitoring is carried out with rats placed in a circular servo-controlled rat cage that enables the unrestrained movement of the rat throughout the study. At the same time, the tangling of cables from the flow probe and arterial catheters is prevented. Rats are first instrumented with an ultrasonic flow probe placement on the left renal artery and an arterial catheter implanted in the right femoral artery. These are routed subcutaneously to the nape of the neck, and connected to the flowmeter and pressure transducer, respectively, to measure RBF and BP. Following surgical implantation, rats are immediately placed in the cage to recover for at least one week and stabilize the ultrasonic probe recordings. Urine collection is also feasible in this system. The surgical and post-surgical procedures for continuous monitoring are demonstrated in this protocol.

The present protocol describes a long-term continuous measurement of renal blood flow in conscious rats and simultaneously recording blood pressure with implanted catheters (fluid-filled or by telemetry).

의식이있는 쥐의 신장 혈류에 대한 장기간 연속 측정

The kidneys play a crucial role in maintaining the homeostasis of body fluids. The regulation of renal blood flow (RBF) is essential to the vital ...

<meta charset="utf8"></head><body>Angled Silicon Multielectrode Recordings for Deep Brainstem Structures in Mice

Acute Single-Unit Multi-Electrode Recordings from the Brainstem of Head-Fixed Mice

Silicon multielectrode-based recordings are increasingly popular for studying neuronal activity at the temporal resolution of action potentials in many brain regions. However, recording neuronal activity from deep caudal structures like the brainstem using multi-channel probes remains challenging. A significant concern is finding a trajectory for probe insertion that avoids large blood vessels, such as the superior sagittal venous sinus and the transverse venous sinus. Injuring these large veins can cause extensive bleeding, damage to the underlying brain tissue, and potentially death. This approach describes targeting brainstem structures by coupling anterior coordinates with an angled approach, allowing the recording probe to penetrate the brain below high-risk vascular structures. Compared to a strictly vertical approach, the angled approach maximizes the number of brain regions that can be targeted. Using this strategy, the ventrolateral periaqueductal gray (vlPAG), a brainstem region associated with REM sleep, can be reproducibly and reliably accessed to obtain single-unit, multi-electrode recordings in head-fixed mice before and during sevoflurane anesthesia. The ability to record neuronal activity in the vlPAG and surrounding nuclei with high temporal resolution is a step forward in advancing the understanding of the relationship between REM sleep and anesthesia.

<meta charset="utf8"></head><body>저자 스포트라이트: Investigating Anesthesia-Induced Sleep Pathways and Neuronal Excitability in Mice (생쥐의 마취 유도 수면 경로 및 신경 흥분성 조사)

This protocol describes a method to obtain in vivo, high-density single-neuron recordings from the brainstem of head-fixed mice. This approach is deployed to measure the action potential firing of neurons in the ventrolateral periaqueductal gray - a brainstem region inactive during Rapid Eye Movement (REM) sleep - before and during general anesthesia.

Head-Fixed Mice의 뇌간에서 발생한 급성 단일 단위 다중 전극 기록

Silicon multielectrode-based recordings are increasingly popular for studying neuronal activity at the temporal resolution of action potentials in many ...

신장 동 정적인 신경 활동의 의식, 정 맥 주입 혈압 동시 녹음에 대 한 새로운 접근 방식을 억제 쥐.

요약

더 많은 비디오 탐색

이 비디오의 챕터

의식 억제 마우스에 인슈린 과다 - euglycemic 클램프

혈액 샘플링, 마약 관리 및 의식 검사 중 혈압과 심장 박동을 측정 대퇴 동맥혈과 정맥 Catheterization

의식 설치류에서 신장 기능의 경피 평가

마 취 쥐에서 중앙 신경 조작에 대 한 응답에서 신장 교감 신경 활동에 심각한 변화를 측정

동시 심전도 기록 및 침략 적 혈액 압력 측정 쥐에

의식이 있는 마우스에서 자발적인 압력반사 민감도를 결정하기 위해 결합된 원격 측정 ECG 및 혈압 전송기 이식

의식이있는 쥐의 신장 혈류에 대한 장기간 연속 측정

Head-Fixed Mice의 뇌간에서 발생한 급성 단일 단위 다중 전극 기록

Head-Fixed Mice의 뇌간에서 발생한 급성 단일 단위 다중 전극 기록

Head-Fixed Mice의 뇌간에서 발생한 급성 단일 단위 다중 전극 기록