Ultrasound-guided central vascular interventions, comments on the European Federation of Societies for Ultrasound in Medicine and Biology guidelines on interventional ultrasound

Advantages of the use of ultrasound in newborn vascular access: a systematic review

Vascular access in neonates and small infants is often challenging. Ultrasound (US) screening and guidance improves its safety and efficacy. The advantages of a pre-implantation ultrasound examination are intuitive; it is a practical and safe technique that doesn't use radiation, allowing static and dynamic evaluations to be carried out and identifying anatomical variations, the caliber and depth of the vessel, the patency of the entire course and attached structures (nerves, etc.). Optimization of the image is a crucial aspect in achieving a clear view of all anatomical structures while avoiding complications. The goal of this review was to look into the benefits of using US in invasive catheter insertion procedures, especially in pediatric patients. Ultrasonography is used to visualize vessels and related structures in two dimensions (2D), sometimes with the help of color Doppler to detect the presence of intraluminal thrombi by applying gentle compression to assess vessel collapse and evaluate morphologic changes in the internal jugular vein (IJV) who had undergone central venous catheter (CVC) insertion during the neonatal period (Montes-Tapia et al. in J Pediatr Surg 51:1700-1703, 2016).

Ultrasound-guided renal puncture followed by endoscopically guided tract dilatation vs standard fluoroscopy-guided percutaneous nephrolithotomy for non-opaque renal stones; a randomized clinical trial

This study was designed to evaluate the non-inferiority of ultrasound puncture followed by endoscopically guided tract dilatation compared to the standard fluoroscopy-guided PCNL. Forty patients with non-opaque kidney stones eligible for PCNL were randomly divided into two groups. The standard fluoroscopy-guided PCNL using the Amplatz dilator was performed in the XRAY group. In the SONO group, the Kidney was punctured under an ultrasound guide followed by tract dilatation using a combination of the Amplatz dilator based on the tract length and an endoscopically guided tract dilatation using a bi-prong forceps in cases of short-advancement. The primary outcome was successful access. In 90% of cases in the XRAY and 95% in the SONO group access dilatation process was performed uneventfully at the first attempt (p = 0.5). In 45% of cases in the SONO group, bi-prong forceps were used as salvage for short-advancement. In one case in the X-ray group over-advancement occurred. One month after surgery, the stone-free rate on the CT-scan was 75% for the X-ray group and 85% for the SONO group (p = 0.4). There were no significant differences in operation time, hospitalization duration, transfusion, or complication rates between the two groups. We conclude that ultrasound-guided renal puncture, followed by endoscopically guided tract dilatation can achieve a high success rate similar to X-ray-guided PCNL while avoiding the harmful effects of radiation exposure and the risk of over-advancement.

Inadvertent Arterial Placement of a Peripherally Inserted Central Catheter in an Infant With Dilated Cardiomyopathy: A Case Report

Peripherally inserted central catheter (PICC) placement under real-time ultrasound guidance has emerged as a favorable procedure in children as a method to efficiently obtain central access. Nevertheless, small infants with hemodynamic instability are at high risk of complications and extra precautions are necessary. We present a case of an inadvertent arterial placement of a PICC in a two-month-old infant with dilated cardiomyopathy and decompensated heart failure. Differentiation of arteries and veins under ultrasonographic evaluation may sometimes be difficult when the applied tourniquet pressure exceeds the patient's arterial blood pressure. In particular, arterial flow can be easily compromised by applying tourniquet pressure in small children with low blood pressure. A thorough understanding of the upper extremity vascular anatomy, basic scanning techniques, and meticulous preparation especially in small infants with hemodynamic instability are essential for maintaining the safety and efficacy of this procedure.

The outcome of ultrasound-guided insertion of central hemodialysis catheter

OBJECTIVE

To point out our experience and assess the efficacy and safety of real-time ultrasound-guided central internal jugular vein (IJV) catheterization in the treatment of hemodialysis patients.

METHODS

This retrospective study comprised 150 patients with end-stage renal disease (ESRD) who had real-time ultrasonography (US)-guided IJV HD catheters placed in our hospital between March 2019 and March 2021. Patients were examined for their demographic data, etiology, site of catheter insertion, type (acute or chronic) of renal failure, technical success, operative time, number of needle punctures, and procedure-related complications. Patients who have had multiple catheter insertions, prior catheterization challenges, poor compliance, obesity, bony deformity, and coagulation disorders were considered at high-operative risk.

RESULTS

All patients experienced technical success. In terms of patient clinical features, an insignificant difference was observed between the normal and high-risk groups (p-value > 0.05). Of the 150 catheters, 62 (41.3%) were placed in high-risk patients. The first-attempt success rate was 89.8% for the normal group and 72.5% for the high-risk group (p = 0.006). IJV cannulation took less time in the normal-risk group compared to the highrisk group (21.2 ± 0.09) minutes vs (35.4 ± 0.11) minutes, (p < 0.001). There were no serious complications. During the placing of the catheter in the internal jugular vein, four patients (6.4%) experienced arterial puncture in the high-risk group. Two participants in each group got a small neck hematoma. One patient developed a pneumothorax in the high-risk group, which was managed with an intercostal chest tube insertion.

CONCLUSIONS

Even in the high-risk group, the real-time US-guided placement of a central catheter into the IJV is associated with a low complication rate and a high success rate. Even under US guidance, experience lowers complication rates. Real-time USguided is recommended to be used routinely during central venous catheter insertion.

Comparison between internal jugular vein access using midline catheter and peripheral intravenous access during cardiopulmonary resuscitation in adults

Objectives

Vascular access is an important procedure for drug administration during the resuscitation of a patient with cardiac arrest; however, it can be challenging under emergent conditions. This study aimed to investigate the efficiency of ultrasound-guided internal jugular venous access using a midline catheter versus peripheral intravenous access during cardiopulmonary resuscitation.

Methods

This was a prospective single-center observational study among patients who received cardiopulmonary resuscitation. The primary outcomes were the success rate of first attempt and the time taken for vascular access via the internal jugular and peripheral veins. We also measured the diameter of the internal jugular and peripheral veins at the access point and the distance from the access point to the heart.

Results

In all, 20 patients were included in the study. Internal jugular and peripheral venous access had a first-attempt success rate of 85% and 65%, respectively (p = 0.152). The time to access the internal jugular and peripheral veins was 46.4 ± 40.5 s and 28.8 ± 14.7 s, respectively (p = 0.081). The diameter of the internal jugular and peripheral veins was 10.8 ± 2.6 mm and 2.8 ± 0.8 mm, respectively (p < 0.001). The distance from the vascular access point to the heart was 20.3 ± 4.7 cm and 48.8 ± 13.1 cm for the internal jugular and peripheral veins, respectively (p < 0.001).

Conclusions

There was a trend toward higher success rates in the internal jugular vein rather than the peripheral intravenous approach, which was not statistically significant.

Arterial Cannulation Near-Miss During Jugular Venous Catheterization With Carotid Artery Aneurysm: A Case Report

Central venous catheterization is a common procedure that may lead to inadvertent arterial cannulation, potentially causing bleeding, hematoma, stroke or rarely, death. In this near-miss case presentation, an aneurysmal carotid artery was misidentified with ultrasound by a junior resident, nearly leading to placement of a sheath into the artery. This case highlights arterial punctures that still occur even with ultrasound guidance. Further, training inadequacies as well as anatomic, cultural, and production pressure factors led to this potentially highly morbid near-miss. Physician teachers should critically evaluate teaching methods to confirm that trainees are learning skills as intended. (A&A Practice. 2023;17:e01661.).

Use of ultrasound to confirm guidewire position in hemodialysis catheter implantation

INTRODUCTION

Hemodialysis is the most used dialysis modality in Brazil for the treatment of end-stage chronic kidney disease and severe acute kidney injury. Non-tunneled, short-term, double-lumen catheters allow immediate vascular access in patients without a definitive vascular access for dialysis treatment. Implantation is performed using the Seldinger technique, traditionally based on anatomical landmarks or with puncture under direct visualization by ultrasonography. Confirmation of the placement of the catheter is usually made with a chest X-ray after the end of the procedure.

OBJECTIVE

To describe the use of ultrasonography to confirm the proper positioning of the guidewire during catheter implantation in real time, ensuring the desired path.

METHODS

We used the Seldinger technique for catheter implantation. The confirmation of the position of the guidewire occurred after the introduction of 50 cm of this wire, as described in the aforementioned technique. A convex transducer was placed longitudinally below the xiphoid process to visualize the guidewire in the inferior vena cava, or transversely at the same location to visualize it in the cavoatrial junction or right ventricle, using the two-dimensional mode of the ultrasound device. After viewing the guidewire, the catheter implantation proceeded.

RESULTS AND DISCUSSION

The technique was performed in 1549 patients, and regarded 2596 catheter implantations over a period of 5 years and 9 months. The only complication observed was local hematoma, occurring in 0.1% of cases.

CONCLUSION

Confirmation of guidewire position with ultrasonography during catheter implantation is recommended because it is safe, low cost and ensures correct catheter direction.

[Myths and Legends: Electrocardiographic Position Control of Central Venous Catheters - Where Does the P Come from?]

Misplacement of central venous accesses can be associated with deleterious iatrogenic complications. Electrocardiography is often used to guide the placement of central venous catheters and to confirm the correct position of the catheter tip. A characteristically peaked p-wave is traditionally considered to indicate the entrance of the catheter tip into the right atrium. However, recent data show that intraarterial and even extravascular localisation might result in an increased amplitude. The peaked p-wave most likely detects the pericardial reflection rather than a right atrial catheter position, hence real-time ultrasound is to be recommended as a superior technique to confirm a correct catheter position.

Ultrasound-guided internal jugular venipuncture using pocket-sized versus standard ultrasound devices: a prospective non-inferiority trial

PURPOSE

Pocket-sized ultrasound devices (PUDs) are commonly adopted for bedside use despite their inferior performance compared with standard ultrasound devices (SUDs). We investigated the non-inferiority of PUDs versus SUDs for ultrasound-guided internal jugular venipuncture.

METHODS

All patients undergoing scheduled surgery with general anesthesia and internal jugular vein catheter placement were prospectively included in this randomized non-inferiority trial to compare the qualities of the internal jugular venipuncture between the PUD group (Group P) and SUD group (Group S). The primary endpoint was puncture time, and the secondary endpoints included number of punctures, needle and guidewire visibility, and anatomic visibility.

RESULTS

Fifty-two patients were randomized to one of the two groups (26 per group). The mean (SEM) puncture time was 56.4 (10.9) s in Group P and 45.5 (4.0) s in Group S. The mean difference of 10.9 s was within the prespecified non-inferiority margin of 100% (two-sided 95% CI: - 12.9-34.6, upper limit of the 95% CI: 45.5) for puncture time. The mean (SEM) number of punctures was 1.15 (0.12) times in Group P and 1.12 (0.06) times in Group S. The difference of 0.04 punctures was within the prespecified non-inferiority margin of 100% (two-sided 95% CI: - 0.24-0.31, upper limit of the 95% CI: 1.12) for number of punctures. Non-inferiority was not shown for needle and guidewire visibility and anatomic visibility.

CONCLUSION

PUDs for internal jugular venipuncture are not inferior to SUDs with regard to puncture time and number of punctures, despite differences in visibility and device performance.

Static Ultrasound Guidance VS. Anatomical Landmarks for Subclavian Vein Puncture in the Intensive Care Unit: A Pilot Randomized Controlled Study

BACKGROUND

Subclavian vein puncture is commonly used in the intensive care unit (ICU) but is associated with complications.

OBJECTIVE

Our aim was to compare the efficacy and safety of static ultrasound-guided subclavian vein puncture with traditional anatomical landmark-guided subclavian vein puncture in critically ill patients in the ICU.

METHODS

This pilot randomized controlled trial enrolled patients admitted to the ICU and requiring subclavian vein puncture between November 2017 and September 2018. The patients were randomized to ultrasound-guided puncture or anatomical landmark-guided puncture. The primary outcome measure was the puncture success rate. The secondary outcome measures included the number of punctures, rate of success at the first attempt, puncture time (i.e., procedure duration) and incidence of complications.

RESULTS

A total of 194 patients were included in the analyses. Compared with the anatomical landmarks group, the ultrasound group had a higher puncture success rate (91.7% vs. 77.6%; p = 0.007), lower rate of complications (7.3% vs. 20.4%; p = 0.008), and lower incidence of mispuncture of an artery (2.1% vs. 14.3%; p = 0.002). There were no significant differences in the number of punctures and puncture time between the two groups (both, p > 0.05).

CONCLUSIONS

Static ultrasound-guided subclavian vein puncture is superior to the traditional landmark-guided approach for critically ill patients in the ICU. It is suggested that static ultrasound-guided puncture techniques should be considered for subclavian vein puncture in the ICU.

TRIAL REGISTRATION

ChiCTR1900024051.

Fluoroscopic-Guided Paramedian Approach for Lumbar Catheter Placement in Cerebrospinal Fluid Shunting: Assessment of Safety and Accuracy

BACKGROUND

Spinal catheter insertion in lumboperitoneal (LP) shunt surgery for idiopathic normal pressure hydrocephalus (iNPH) is frequently associated with technical difficulties especially in patients with obesity and elderly patients with vertebral deformities.

OBJECTIVE

To elucidate the accuracy and safety of image-guided spinal catheter placement using a paramedian approach (PMA).

METHODS

We retrospectively analyzed 39 consecutive iNPH patients treated by LP shunting with spinal catheter insertion via the PMA. The success rate of catheter placement and the number of changes in puncture location were evaluated. Accuracy of catheter insertion was assessed by measuring both vertical and horizontal deviations in the point of catheter dural penetration from the center of the interlaminar space.

RESULTS

The success rate of catheter placement was 100% (39/39). The difficulty rate for catheter insertion, measured by the number of changes in puncture location, was 2.6% (1/39). No bloody punctures or surgical infections were observed. Accuracy of catheter insertion, measured as the degree of deviation, was 0.5 ± 1.9 mm horizontally and 0.0 ± 2.4 mm vertically. The rates of minor complications, including caudal catheter insertion, transient low-pressure headache, and root pain, were 5.1% (2/39), 10.4% (4/39), and 0% (0/43), respectively. Subdural hematoma requiring surgical intervention occurred in 1 case (2.6%). During the mean follow-up period of 36 mo, spinal catheter rupture at the level of the spinous processes was not observed.

CONCLUSION

Fluoroscopic-guided spinal catheter placement via the PMA was safe, accurate, and reliable, even for use in geriatric and obese patients.

A Review of Central Venous Access Using Ultrasound Guidance Technology

More than 5 million central lines are placed in the United States each year. Advanced practice providers place central lines and must understand the importance of ultrasound guidance technology. The use of anatomic landmarks to place central lines has been employed in the past and in some instances is still used. This method may make accessing the target vessel difficult in the patient with anomalous anatomy or in the obese patient. These characteristics decrease successful placement and increase complications. Different organizations have agreed that the use of ultrasound during central venous access has decreased rates of complication and cost. In addition to cannulating and accessing a central vein, ultrasound can be used to rapidly confirm placement and to rule out complications such as pneumothorax. Utilizing ultrasound to assist in performance of procedures, and in assessment of patients, is a skill that should be optimized by nurse practitioners.

Central venous catheterization in cancer patients with severe thrombocytopenia: Ultrasound-guide improves safety avoiding prophylactic platelet transfusion

Prior research has revealed that ultrasound (US) guided central venous catheterization (CVC) is associated with a reduction in the complication rate such as pneumothorax and an improved first-pass success placing CVC in the internal jugular vein. The present study investigated if US-guided CVC, in a subset of cancer patients with severe thrombocytopenia, reduced bleeding risk and avoided prophylactic platelet transfusion. The efficacy and safety of US-guided CVC placement in cancer patients with severe thrombocytopenia was retrospectively analyzed over a period of 9 years (Dec 2000-Jan 2009), 1,660 and 207 patients with cancer underwent US-guided CVC placement into internal jugular vein respectively at the Department of Onco-Haematology, Hospital of Piacenza. The first group of patients included patients in active antitumor treatment, while the second group included patients in the palliative phase. A total of 110 (5.89%) of these 1,867 patients exhibited severe thrombocytopenia defined as platelet count ≤20x109/l, and formed the basis of this study. All procedures were evaluated for bleeding complications as defined by the National Institute of Health Common Terminology Criteria for Adverse Events (CTCAE 3.0). In the subgroup of the 110 patients with severe thrombocytopenia a single needle puncture of the vein was employed in 121 of the 122 procedures (99.18%) and no attempt failures were registered. No pneumothorax, no major bleeding and no nerve and arterial puncture were reported, only one self-limiting hematoma (0.90%) at the site of CVC insertion was reported (CTCAE 3.0 grade 1). No platelet transfusions were performed in the 110 patients, pre and post CVC placement. We believe that US-guided CVC insertion procedures into the internal jugular vein makes the difference in safety, also in thrombocytopenic patients avoiding prophylactic or post procedure platelet transfusion.

Point-of-care ultrasound: its growing application in hospital medicine

Point-of-care ultrasound is emerging as an important adjunct to the clinical examination. Ultrasonography has long been seen as a modality for experts but this is changing and it is hoped that, with appropriate training, point-of-care ultrasound will become a modern-day diagnostic necessity.

Resuscitative Endovascular Balloon Occlusion of the Aorta: A Review for Emergency Clinicians

BACKGROUND

Non-compressible torso hemorrhage (NCTH) is difficult to control and associated with significant mortality. Resuscitative endovascular balloon occlusion of the aorta (REBOA) utilizes an infra-diaphragmatic approach to control NCTH and is less invasive than resuscitative thoracotomy (RT). This article highlights the evidence for REBOA and provides an overview of the indications, procedural steps, and complications in adults for emergency clinicians.

DISCUSSION

Traumatic hemorrhage can be life threatening. Patients in extremis, whether from NCTH or exsanguination from other sites, may require RT with aortic cross-clamping. REBOA offers another avenue for proximal hemorrhage control and can be completed by emergency clinicians. The American College of Surgeons Committee on Trauma and the American College of Emergency Physicians recently released a joint statement detailing the indications for REBOA in adults. The evidence behind its use remains controversial, with significant heterogeneity among studies. Most studies demonstrate improved blood pressure without a significant improvement in mortality. Procedural steps include arterial access (most commonly the common femoral artery), positioning the initial sheath, balloon preparation and positioning, balloon inflation, securing the balloon/sheath, subsequent hemorrhage control, balloon deflation, and balloon/sheath removal. Several major complications can occur with REBOA placement. Future studies should evaluate training protocols, the role of simulation, and which target populations would benefit most from REBOA.

CONCLUSIONS

REBOA can provide proximal hemorrhage control and can be performed by emergency clinicians. This article evaluates the evidence, indications, procedure, and complications for emergency clinicians.

Traditional and ultrasound physical examinations: a hybrid approach to improve clinical care

Point-of-care ultrasonography, which is performed at the bedside by physicians who are not specialists in imaging, has become possible thanks to recent technological advances that have allowed for a device with greater portability while maintaining image quality. The increasing use of point-of-care ultrasonography in different specialties has made it possible to expand physical examinations, make timely decisions about the patients and allows the performance of safer medical procedures. In this review, three cases from our experience are presented that highlight the use of point-of-care ultrasonography by clinicians. Bedside ultrasonography is a convenient modality used in a clinical setting to aid in early diagnosis of several common conditions. It is suggested that a hybrid approach of physical examination and point-of-care ultrasonography in the everyday clinical practice is an inevitable change of paradigm that is improving quality of care in a variety of clinical settings.

The Principles and Procedures of Ultrasound-guided Anesthesia Techniques

For inexperienced users, training with phantoms is an important part of training. Inexperienced users can teach themselves to gain significant procedural skills. Participating in training courses or practising with experts can enhance the outcomes. Inexperienced users need to understand the indications, clinical pearls, and pitfalls of each procedure to avoid potential complications. Inexperienced users can also train and teach themselves to become proficient in ultrasound techniques.

Contrast enhanced ultrasound (CEUS) imaging of solid benign focal liver lesions

Ultrasound is well accepted worldwide for imaging of the liver. Absences of radiation exposure, low cost and large diffusion are some of the advantages that make this technique the first to be used in the assessment of focal liver lesions (FLL). Areas covered: Contrast enhanced ultrasound (CEUS) has been introduced more than twenty years ago, and its detection rate is comparable to that of contrast enhanced magnetic resonance imaging (CEMRI) and contrast enhanced computed tomography (CECT). In this narrative review, we discuss the main CEUS features of benign liver lesions and controversies in published results including the gold standard chosen and the quality and knowledge of the preferred techniques. Expert commentary: CEUS is safe and allows an immediate evaluation of the nature of FLL. CEUS permits differentiation between malignant and benign FLL in healthy liver parenchyma by analysing the arterial, portal venous and late phases. CEMRI and CECT are reliable to characterize FLL but higher costs, radiation exposure, nephrotoxicity (in particular for CECT) and absence of real time imaging limit the appropriate evaluation of FLL. Therefore CEUS can be preferred in most clinical situations, and when results are unclear or suggestive for malignant FLL, biopsy and histological examination can be directly initiated avoiding unnecessary additional imaging.

EUS elastography: How to do it?

Strain elastography as used in EUS (EUS-real-time tissue elastography [RTE]) is a qualitative technique and provides information on the relative stiffness between one tissue and another. This article reviews the principles, technique, and interpretation of EUS-RTE in various organs. It includes information on how to optimize the technique as well as a discussion on pitfalls and artifacts. We also refer to the article describing RTE using conventional ultrasound transducers.

Chest wall-parallel vs. conventional subclavian venous catheterization in cancer chemotherapy: A comparison of complication rates

The incidence of complications such as pneumothorax and hematoma between the chest wall-parallel and conventional subclavian venous catheterization in cancer chemotherapy was compared. From December 2011 to March 2016, a total of 314 patients undergoing chemotherapy for cancer in the Guizhou Provincial People's Hospital were assigned to either the Chest Wall-parallel (n=155) or the conventional subclavian venous catheterization group (n=159) in order to observe the primary success rate for catheterization and to assess the incidence of complications such as pneumothorax, hemothorax, hematoma, and internal jugular venous injury. The primary success rates for catheterization were not significantly different between the conventional and chest wall-parallel subclavian venous catheterization groups (94.3% vs. 96.8%, P>0.05), with a total catheterization success rate of 100% in both groups. However, the incidence of pneumothorax was significantly different between the groups (6.29% in conventional vs. 0% in chest wall-parallel subclavian venous catheterization group, P<0.05). Therefore, compared to conventional subclavian venous catheterization, the chest wall-parallel approach could reduce the risk of or even totally prevent pneumothorax and other venipunctures and is, thus, a relatively safe and effective technique that could have wide applications in clinical settings.

Ultrasound-guided central venous catheter placement: a structured review and recommendations for clinical practice

The use of ultrasound (US) has been proposed to reduce the number of complications and to increase the safety and quality of central venous catheter (CVC) placement. In this review, we describe the rationale for the use of US during CVC placement, the basic principles of this technique, and the current evidence and existing guidelines for its use. In addition, we recommend a structured approach for US-guided central venous access for clinical practice. Static and real-time US can be used to visualize the anatomy and patency of the target vein in a short-axis and a long-axis view. US-guided needle advancement can be performed in an "out-of-plane" and an "in-plane" technique. There is clear evidence that US offers gains in safety and quality during CVC placement in the internal jugular vein. For the subclavian and femoral veins, US offers small gains in safety and quality. Based on the available evidence from clinical studies, several guidelines from medical societies strongly recommend the use of US for CVC placement in the internal jugular vein. Data from survey studies show that there is still a gap between the existing evidence and guidelines and the use of US in clinical practice. For clinical practice, we recommend a six-step systematic approach for US-guided central venous access that includes assessing the target vein (anatomy and vessel localization, vessel patency), using real-time US guidance for puncture of the vein, and confirming the correct needle, wire, and catheter position in the vein. To achieve the best skill level for CVC placement the knowledge from anatomic landmark techniques and the knowledge from US-guided CVC placement need to be combined and integrated.

A comparison of longitudinal and transverse approaches to ultrasound-guided axillary vein cannulation by experienced operators

BACKGROUND

The axillary vein is an easily accessible vessel that can be used for ultrasound-guided central vascular access and offers an alternative to the internal jugular and subclavian veins. The objective of this study was to identify which transducer orientation, longitudinal or transverse, is better for imaging the axillary vein with ultrasound.

METHODS

We analyzed 236 patients who had undergone central venous cannulation of axillary vein in this retrospective study. Patients were divided into two groups, the longitudinal approach group (n=120) and transverse approach group (n=116). Recorded the one-attempt success rate, operation time, arterial puncture rate and pneumothorax rate. We perform chest radiography to confirm pneumothorax on all patients. We compared the one-attempt success rate, operation time, arterial puncture rate and pneumothorax rate between the two groups.

RESULTS

The two groups were comparable with clinical characters of patients. The overall success rates of the longitudinal group and the transverse group were both 100%. The rate of one-attempt success in the longitudinal approach group is higher than the transverse approach group (91.7% vs. 82.8%, P=0.040). The transverse approach group had shorter operation time than the longitudinal group (184.7±8.1 vs. 287.5±19.6 seconds, P=0.000). The two groups had lower postoperative complications. Arterial puncture occurred in 1 of 120 longitudinal and 2 of 116 transverse attempts and this difference was no significant (P=0.541). No pneumothorax occurred in the two groups.

CONCLUSIONS

The longitudinal approach during ultrasound-guided axillary vein cannulation is associated with greater one-attempt success rate compared with the transverse approach by experienced operators. The transverse approach has shorter operation time. The two groups have lower postoperative complications and are comparable with pneumothorax and arterial puncture.

Thromboelastometry versus standard coagulation tests versus restrictive protocol to guide blood transfusion prior to central venous catheterization in cirrhosis: study protocol for a randomized controlled trial

Background

Liver failure patients have traditionally been empirically transfused prior to invasive procedures. Blood transfusion is associated with immunologic and nonimmunologic reactions, increased risk of adverse outcomes and high costs. Scientific evidence supporting empirical transfusion is lacking, and the best approach for blood transfusion prior to invasive procedures in cirrhotic patients has not been established so far.

The aim of this study is to compare three transfusion strategies (routine coagulation test-guided – ordinary or restrictive, or thromboelastometry-guided) prior to central venous catheterization in critically ill patients with cirrhosis.

Methods/design

Design and setting: a double-blinded, parallel-group, single-center, randomized controlled clinical trial in a tertiary private hospital in São Paulo, Brazil. Inclusion criteria: adults (aged 18 years or older) admitted to the intensive care unit with cirrhosis and an indication for central venous line insertion. Patients will be randomly assigned to three groups for blood transfusion strategy prior to central venous catheterization: standard coagulation tests-based, thromboelastometry-based, or restrictive. The primary efficacy endpoint will be the proportion of patients transfused with any blood product prior to central venous catheterization. The primary safety endpoint will be the incidence of major bleeding. Secondary endpoints will be the proportion of transfusion of fresh frozen plasma, platelets and cryoprecipitate; infused volume of blood products; hemoglobin and hematocrit before and after the procedure; intensive care unit and hospital length of stay; 28-day and hospital mortality; incidence of minor bleeding; transfusion-related adverse reactions; and cost analysis.

Discussion

This study will evaluate three strategies to guide blood transfusion prior to central venous line placement in severely ill patients with cirrhosis. We hypothesized that thromboelastometry-based and/or restrictive protocols are safe and would significantly reduce transfusion of blood products in this population, leading to a reduction in costs and transfusion-related adverse reactions. In this manner, this trial will add evidence in favor of reducing empirical transfusion in severely ill patients with coagulopathy.

Trial registration

ClinicalTrials.gov, identifier: NCT02311985. Retrospectively registered on 3 December 2014.

Electronic supplementary material

The online version of this article (doi:10.1186/s13063-017-1835-5) contains supplementary material, which is available to authorized users.