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Kaptein EM, Kaptein MJ. Inferior vena cava ultrasound and other techniques for assessment of intravascular and extravascular volume: an update. Clin Kidney J 2023; 16:1861-1877. [PMID: 37915939 PMCID: PMC10616489 DOI: 10.1093/ckj/sfad156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2023] [Indexed: 11/03/2023] Open
Abstract
Goals of volume management are to accurately assess intravascular and extravascular volume and predict response to volume administration, vasopressor support or volume removal. Data are reviewed that support the following: (i) Dynamic parameters reliably guide volume administration and may improve clinical outcomes compared with static parameters, but some are invasive or only validated with mechanical ventilation without spontaneous breathing. (ii) Ultrasound visualization of inferior vena cava (IVC) diameter variations with respiration reliably assesses intravascular volume and predicts volume responsiveness. (iii) Although physiology of IVC respiratory variations differs with mechanical ventilation and spontaneous breathing, the IVC collapsibility index (CI) and distensibility index are interconvertible. (iv) Prediction of volume responsiveness by IVC CI is comparable for mechanical ventilation and spontaneous breathing patients. (v) Respiratory variations of subclavian/proximal axillary and internal jugular veins by ultrasound are alternative sites, with comparable reliability. (vi) Data support clinical applicability of IVC CI to predict hypotension with anesthesia, guide ultrafiltration goals, predict dry weight, predict intra-dialytic hypotension and assess acute decompensated heart failure. (vii) IVC ultrasound may complement ultrasound of heart and lungs, and abdominal organs for venous congestion, for assessing and managing volume overload and deresuscitation, renal failure and shock. (viii) IVC ultrasound has limitations including inadequate visualization. Ultrasound data should always be interpreted in clinical context. Additional studies are required to further assess and validate the role of bedside ultrasonography in clinical care.
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Affiliation(s)
- Elaine M Kaptein
- Departments of Medicine, Divisions of Nephrology, University of Southern California, Los Angeles, CA, USA
| | - Matthew J Kaptein
- Departments of Medicine, Divisions of Nephrology, University of Southern California, Los Angeles, CA, USA
- Loma Linda University Medical Center, Loma Linda, CA, USA
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N P, Sinha M, Kumar M, Ramchandani S, Khetrapal M, Karoo K, Mesa BK. Role of Internal Jugular Vein Collapsibility Index in Predicting Post-spinal Hypotension in Pregnant Women Undergoing Cesarean Section: A Prospective Observational Study. Cureus 2023; 15:e39389. [PMID: 37362461 PMCID: PMC10286763 DOI: 10.7759/cureus.39389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/19/2023] [Indexed: 06/28/2023] Open
Abstract
Introduction Post-spinal hypotension (PSH) frequently occurs in women undergoing cesarean section. In recent studies, Ultrasound-guided measurements of the internal jugular vein (IJV) have been reported to predict fluid responsiveness. We planned to evaluate the correlation between the internal jugular vein collapsibility index (IJVCI) and PSH in cesarean section patients. Methods Ninety-one parturients who underwent elective lower segment cesarean section with a singleton pregnancy were recruited. Preoperatively, patients were placed in a supine position with a 15-degree left lateral tilt. Maximum (at the end of expiration) and minimum (at the end of inspiration) IJV diameters (mm) and IJVCI were assessed using M-mode imaging during spontaneous and deep breathing. Spinal anaesthesia was performed at the L3-4 or L4-5 level. Systolic blood pressure, diastolic blood pressure, mean arterial pressure, heart rate, respiratory rate, and SpO2 were recorded from baseline till the delivery of the baby. Results Among 91 patients, 40 (45.5%) patients had at least one episode of hypotension. Demographic variables and baseline vitals were comparable between the hypotensive and normotensive groups (p>0.05). In spontaneous and deep breathing, IJV diameter at the end-expiration (IJVdmax), end-inspiration (IJVdmin), and IJVCI amongst both hypotensive and non-hypotensive pregnant women were statistically similar. Receiver Operating Characteristic (ROC) curve analysis showed that during spontaneous breathing, using a cut-off point of 29.5%, IJVCI had a sensitivity and specificity of 70% and 23%, respectively, for predicting PSH; whereas during deep breathing, IJVCI had a sensitivity and specificity of 77% and 27%, respectively, for predicting the same using a cut-off value of 37.5%. Conclusion We conclude that internal jugular vein parameters such as maximum diameter, minimum diameter, and IJVCI during spontaneous and deep breathing cannot be used as reliable predictors of post-spinal hypotension in pregnant patients undergoing elective cesarean section.
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Affiliation(s)
- Pharanitharan N
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Mamta Sinha
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Mayank Kumar
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Sarita Ramchandani
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Monica Khetrapal
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Khushbu Karoo
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
| | - Bharath K Mesa
- Anaesthesiology, All India Institute of Medical Sciences, Raipur, Raipur, IND
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Inferior Vena Cava Ultrasonography for Volume Status Evaluation: An Intriguing Promise Never Fulfilled. J Clin Med 2023; 12:jcm12062217. [PMID: 36983218 PMCID: PMC10053997 DOI: 10.3390/jcm12062217] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/02/2023] [Accepted: 03/07/2023] [Indexed: 03/14/2023] Open
Abstract
The correct determination of volume status is a fundamental component of clinical evaluation as both hypovolaemia (with hypoperfusion) and hypervolaemia (with fluid overload) increase morbidity and mortality in critically ill patients. As inferior vena cava (IVC) accounts for two-thirds of systemic venous return, it has been proposed as a marker of volaemic status by indirect assessment of central venous pressure or fluid responsiveness. Although ultrasonographic evaluation of IVC is relatively easy to perform, correct interpretation of the results may not be that simple and multiple pitfalls hamper its wider application in the clinical setting. In the present review, the basic elements of the pathophysiology of IVC behaviour, potential applications and limitations of its evaluation are discussed.
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Ma Q, Shi X, Ji J, Chen L, Tian Y, Hao J, Li B. The diagnostic accuracy of inferior vena cava respiratory variation in predicting volume responsiveness in patients under different breathing status following abdominal surgery. BMC Anesthesiol 2022; 22:63. [PMID: 35260075 PMCID: PMC8903007 DOI: 10.1186/s12871-022-01598-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 02/22/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The validation of inferior vena cava (IVC) respiratory variation for predicting volume responsiveness is still under debate, especially in spontaneously breathing patients. The present study aims to verify the effectiveness and accuracy of IVC variability for volume assessment in the patients after abdominal surgery under artificially or spontaneously breathing. METHODS A total of fifty-six patients after abdominal surgeries in the anesthesia intensive care unit ward were included. All patients received ultrasonographic examination before and after the fluid challenge of 5 ml/kg crystalloid within 15 min. The same measurements were performed when the patients were extubated. The IVC diameter, blood flow velocity-time integral of the left ventricular outflow tract, and cardiac output (CO) were recorded. Responders were defined as an increment in CO of 15% or more from baseline. RESULTS There were 33 (58.9%) mechanically ventilated patients and 22 (39.3%) spontaneously breathing patients responding to fluid resuscitation, respectively. The area under the curve was 0.80 (95% CI: 0.68-0.90) for the IVC dimeter variation (cIVC1) in mechanically ventilated patients, 0.87 (95% CI: 0.75-0.94) for the collapsibility of IVC (cIVC2), and 0.85 (95% CI: 0.73-0.93) for the minimum IVC diameter (IVCmin) in spontaneously breathing patients. The optimal cutoff value was 15.32% for cIVC1, 30.25% for cIVC2, and 1.14 cm for IVCmin. Furthermore, the gray zone for cIVC2 was 30.72 to 38.32% and included 23.2% of spontaneously breathing patients, while 17.01 to 25.93% for cIVC1 comprising 44.6% of mechanically ventilated patients. Multivariable logistic regression analysis indicated that cIVC was an independent predictor of volume assessment for patients after surgery irrespective of breathing modes. CONCLUSION IVC respiratory variation is validated in predicting patients' volume responsiveness after abdominal surgery irrespective of the respiratory modes. However, cIVC or IVCmin in spontaneously breathing patients was superior to cIVC in mechanically ventilated patients in terms of clinical utility, with few subjects in the gray zone for the volume responsiveness appraisal. TRIAL REGISTRATION ChiCTR-INR-17013093 . Initial registration date was 24/10/2017.
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Affiliation(s)
- Qian Ma
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Xueduo Shi
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Jingjing Ji
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Luning Chen
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Yali Tian
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Jing Hao
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China
| | - Bingbing Li
- Department of Anesthesiology, Nanjing Drum Tower Hospital, The Affiliated Hosptial of Nanjing University Medical School, 321 Zhongshan Road, 210008, Nanjing, China.
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Kim DW, Chung S, Kang WS, Kim J. Diagnostic Accuracy of Ultrasonographic Respiratory Variation in the Inferior Vena Cava, Subclavian Vein, Internal Jugular Vein, and Femoral Vein Diameter to Predict Fluid Responsiveness: A Systematic Review and Meta-Analysis. Diagnostics (Basel) 2021; 12:diagnostics12010049. [PMID: 35054215 PMCID: PMC8774961 DOI: 10.3390/diagnostics12010049] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/22/2021] [Accepted: 12/22/2021] [Indexed: 01/08/2023] Open
Abstract
This systematic review and meta-analysis aimed to investigate the ultrasonographic variation of the diameter of the inferior vena cava (IVC), internal jugular vein (IJV), subclavian vein (SCV), and femoral vein (FV) to predict fluid responsiveness in critically ill patients. Relevant articles were obtained by searching PubMed, EMBASE, and Cochrane databases (articles up to 21 October 2021). The number of true positives, false positives, false negatives, and true negatives for the index test to predict fluid responsiveness was collected. We used a hierarchical summary receiver operating characteristics model and bivariate model for meta-analysis. Finally, 30 studies comprising 1719 patients were included in this review. The ultrasonographic variation of the IVC showed a pooled sensitivity and specificity of 0.75 and 0.83, respectively. The area under the receiver operating characteristics curve was 0.86. In the subgroup analysis, there was no difference between patients on mechanical ventilation and those breathing spontaneously. In terms of the IJV, SCV, and FV, meta-analysis was not conducted due to the limited number of studies. The ultrasonographic measurement of the variation in diameter of the IVC has a favorable diagnostic accuracy for predicting fluid responsiveness in critically ill patients. However, there was insufficient evidence in terms of the IJV, SCV, and FV.
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Affiliation(s)
- Do-Wan Kim
- Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju 61469, Korea;
| | - Seungwoo Chung
- Department of Critical Care Medicine, Gyeongsang National University Changwon Hospital, Changwon 51472, Korea;
| | - Wu-Seong Kang
- Department of Trauma Surgery, Jeju Regional Trauma Center, Cheju Halla General Hospital, Jeju 63127, Korea;
- Correspondence:
| | - Joongsuck Kim
- Department of Trauma Surgery, Jeju Regional Trauma Center, Cheju Halla General Hospital, Jeju 63127, Korea;
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Cheng Z, Yang QQ, Zhu P, Feng JY, Zhang XB, Zhao ZB. Transesophageal Echocardiographic Measurements of the Superior Vena Cava for Predicting Fluid Responsiveness in Patients Undergoing Invasive Positive Pressure Ventilation. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2019; 38:1519-1525. [PMID: 30298577 DOI: 10.1002/jum.14839] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 09/19/2018] [Indexed: 06/08/2023]
Abstract
OBJECTIVES Preoperative fasting, water deprivation, and intraoperative fluid loss and redistribution result in hypovolemia in patients undergoing surgery. Some findings have indicated that the superior vena cava (SVC) diameter and variation, as determined by transesophageal echocardiography during surgery, do not reflect central venous pressure effectively. This study aimed to compare and correlate the SVC diameter and variation with the stroke volume variation for predicting fluid responsiveness in patients undergoing invasive positive pressure ventilation. METHODS Thirty-six patients scheduled for elective gastrointestinal surgery under general anesthesia with invasive positive pressure ventilation were included in this study. After anesthesia induction, the stroke volume variation, SVC diameter, mean arterial pressure, central venous pressure, and pulse were recorded, and measurements after fluid challenge were recorded as well. The SVC variation was calculated before and after the fluid challenge. RESULTS After the fluid challenge, the SVC diameter markedly increased, whereas the SVC variation and stroke volume variation significantly decreased (P < .05). The optimal cutoff value for the SVC variation was 21.1%, and the area under the curve (AUC) from a receiver operating characteristic curve analysis was 0.849. The optimal cutoff value for the minimal SVC diameter was 1.135 cm, and that AUC was 0.929. In addition, the optimal cutoff value for the maximal SVC diameter was 1.480 cm, and the AUC was 0.862. CONCLUSIONS The minimal SVC diameter may be an effective indicator for predicting fluid responsiveness in patients undergoing invasive positive pressure ventilation.
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Affiliation(s)
- Zhi Cheng
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
| | - Qian-Qian Yang
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
| | - Pin Zhu
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
| | - Ji-Ying Feng
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
| | - Xiao-Bao Zhang
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
| | - Zhi-Bin Zhao
- Department of Anesthesiology, The Affiliated Lianyungang Hospital of Xuzhou Medical University, Lianyungang, China
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Das SK, Choupoo NS, Pradhan D, Saikia P, Monnet X. Diagnostic accuracy of inferior vena caval respiratory variation in detecting fluid unresponsiveness: A systematic review and meta-analysis. Eur J Anaesthesiol 2019; 35:831-839. [PMID: 29901465 DOI: 10.1097/eja.0000000000000841] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND The accuracy of respiratory variation of the inferior vena cava (rvIVC) in predicting fluid responsiveness, particularly in spontaneously breathing patients is unclear. OBJECTIVES To consider the evidence to support the accuracy of rvIVC in identifying patients who are unlikely to benefit from fluid administration. DESIGN Systematic review and meta-analysis. DATA SOURCE We searched MEDLINE, EMBASE, Cochrane Library, KoreaMed, LILCAS and WHO Clinical Trial Registry from inception to June 2017. ELIGIBILITY CRITERIA Case-control or cohort studies that evaluated the accuracy of rvIVC in living adult humans were included. A study was included in the meta-analysis if data enabling construction of 2 × 2 tables were reported, calculated or could be obtained from authors and met the above cited criteria. RESULT A total of 23 studies including 1574 patients were included in qualitative analysis. The meta-analysis involved 20 studies and 761 patients. Pooled sensitivity and specificity of rvIVC in 330 spontaneously breathing patients were 0.80 [95% confidence interval (CI) 0.68 to 0.89] and 0.79 (95% CI 0.60 to 0.90). Pooled sensitivity and specificity of rvIVC in 431 mechanically ventilated patients were 0.79 (95% CI 0.67 to 0.86) and 0.70 (95% CI 0.63 to 0.76). CONCLUSION Decreased inferior vena caval respiratory variation is moderately accurate in predicting fluid unresponsiveness both in spontaneous and mechanically ventilated patients. The findings of this review should be used in the appropriate clinical context and in conjunction with other clinical assessments of fluid status. IDENTIFIER CRD 42017068028.
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Affiliation(s)
- Saurabh K Das
- From the Department of Critical Care, Artemis Hospital, Gurgaram, Haryana (SKD), Department of Anaesthesiology and Critical Care, Post Graduate Institute of Medical Education and Research, Dr Ram Monohar Lohia Hospital, New Delhi, Delhi (NSC), Department of Anaesthesiology and Critical Care, North Eastern Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong, Meghalaya (DP), Department of Anaesthesiology and Critical Care, Guwahati Medical College, Guwahati, Assam, India (PS) and AP-HP, Hôpitaux Universitaires Paris-Sud, Hôpital de Bicêtre, Service de Réanimation Médicale, Paris, France (XM)
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Messina A, Pelaia C, Bruni A, Garofalo E, Bonicolini E, Longhini F, Dellara E, Saderi L, Romagnoli S, Sotgiu G, Cecconi M, Navalesi P. Fluid Challenge During Anesthesia. Anesth Analg 2018; 127:1353-1364. [DOI: 10.1213/ane.0000000000003834] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Orso D, Paoli I, Piani T, Cilenti FL, Cristiani L, Guglielmo N. Accuracy of Ultrasonographic Measurements of Inferior Vena Cava to Determine Fluid Responsiveness: A Systematic Review and Meta-Analysis. J Intensive Care Med 2018; 35:354-363. [PMID: 29343170 DOI: 10.1177/0885066617752308] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Fluid responsiveness is the ability to increase the cardiac output in response to a fluid challenge. Only about 50% of patients receiving fluid resuscitation for acute circulatory failure increase their stroke volume, but the other 50% may worsen their outcome. Therefore, predicting fluid responsiveness is needed. In this purpose, in recent years, the assessment of the inferior vena cava (IVC) through ultrasound (US) has become very popular. The aim of our work was to systematically review all the previously published studies assessing the accuracy of the diameter of IVC or its respiratory variations measured through US in predicting fluid responsiveness. DATA SOURCES We searched in the MEDLINE (PubMed), Embase, Web of Science databases for all relevant articles from inception to September 2017. STUDY SELECTION Included articles specifically addressed the accuracy of IVC diameter or its respiratory variations assessed by US in predicting the fluid responsiveness in critically ill ventilated or not, adult or pediatric patients. DATA EXTRACTION We included 26 studies that investigated the role of the caval index (IVC collapsibility or distensibility) and 5 studies on IVC diameter. DATA SYNTHESIS We conducted a meta-analysis for caval index with 20 studies: The pooled area under the curve, logarithmic diagnostic odds ratio, sensitivity, and specificity were 0.71 (95% confidence interval [CI]: 0.46-0.83), 2.02 (95% CI: 1.29-2.89), 0.71 (95% CI: 0.62-0.80), and 0.75 (95% CI: 0.64-0.85), respectively. CONCLUSION An extreme heterogeneity of included studies was highlighted. Ultrasound evaluation of the diameter of the IVC and its respiratory variations does not seem to be a reliable method to predict fluid responsiveness.
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Affiliation(s)
- Daniele Orso
- Department of Emergency Medicine, Ospedale Civile di Latisana (UD), A.A.S. 2 "Bassa Friulana-Isontina," Latisana, Udine, Italy
| | - Irene Paoli
- Department of Emergency Medicine, Ospedale Civile di Latisana (UD), A.A.S. 2 "Bassa Friulana-Isontina," Latisana, Udine, Italy
| | - Tommaso Piani
- Division of Pre-Hospital and Retrieval Medicine, Department of Anaesthesia and Intensive Care Medicine, ASUIUD "Santa Maria della Misericordia," Udine, Italy
| | - Francesco L Cilenti
- Department of Emergency Medicine, Ospedale Civile di Latisana (UD), A.A.S. 2 "Bassa Friulana-Isontina," Latisana, Udine, Italy
| | - Lorenzo Cristiani
- Department of Emergency Medicine, Ospedale Civile di Latisana (UD), A.A.S. 2 "Bassa Friulana-Isontina," Latisana, Udine, Italy
| | - Nicola Guglielmo
- Department of Emergency Medicine, Ospedale Civile di Latisana (UD), A.A.S. 2 "Bassa Friulana-Isontina," Latisana, Udine, Italy
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Cambournac M, Goy-Thollot I, Violé A, Boisvineau C, Pouzot-Nevoret C, Barthélemy A. Sonographic assessment of volaemia: development and validation of a new method in dogs. J Small Anim Pract 2017; 59:174-182. [PMID: 28960319 DOI: 10.1111/jsap.12759] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 05/11/2017] [Accepted: 06/20/2017] [Indexed: 12/20/2022]
Abstract
OBJECTIVES The aims of this study were to describe a method for the sonographic assessment of volaemia, to determinate inter- and intra-operator variability and to assess the ability to detect blood loss after blood donation in healthy dogs. MATERIALS AND METHODS The left kidney was identified in a spleno-renal view, and transverse views of the caudal vena cava and aorta were obtained in 12 dogs. Vessel diameters were measured in B-mode, in duplicate by two operators, and the caudal vena cava:aorta ratio was calculated. Intra- and inter-operator variabilities were assessed using a Bland-Altman method by plotting the differences between the repeated measurements obtained from the same subject by the same operator and by the two operators against their means. Before and after blood donation measurements were compared using paired t-tests or one-sample t-tests, if appropriate. RESULTS Intra- and inter-operator variability was within the limit of agreement for the vast majority of measurements. After a blood donation of 9·8 ±2·2 mL/kg, the mean aorta measurements were not significantly different from those obtained before blood donation (1·11 versus 1·10, P=0·28), whereas the mean caudal vena cava measurements and caudal vena cava:aorta ratios were significantly lower (1·28 versus 1·01, P<0·0001; 1·17 versus 1·01, P=0·0001, respectively). CLINICAL SIGNIFICANCE The low intra- and inter-operator variabilities in the caudal vena cava, aorta and caudal vena cava:aorta ratio measurements support their reliability and operator independency. The sonographic assessment of volaemia appears to be a promising non-invasive, repeatable point-of-care ultrasound protocol for assessment and monitoring of blood loss. Further studies are needed to assess the sonographic assessment of volaemia protocol in spontaneously bleeding dogs.
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Affiliation(s)
- M Cambournac
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
| | - I Goy-Thollot
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
| | - A Violé
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
| | - C Boisvineau
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
| | - C Pouzot-Nevoret
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
| | - A Barthélemy
- Intensive Care Unit (SIAMU), Université de Lyon, VetAgro Sup, APCSe, F-69280, Marcy l'Etoile, France
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