…peripheral artery disease (PAD), and other manifestations of systemic atherosclerosis. The principal clinical concern is cerebral embolism or haemodynamic compromise leading to transient ischaemic attack…

…or other extracorporeal therapy (requires a large bore dialysis catheter, not an ordinary triple lumen catheter). Measurement of central venous pressure and central venous oxygen…

…media and recently stopped drugs. 8. Treat sepsis, bleeding, shock, hypoxia and any other underlying cause immediately. 9. Request ultrasound of the kidneys and urinary…

…e. septal bulging ). Bedside echocardiography allows for immediate recognition of tamponade. Typically, acute tamponade arises from aortic dissection, and survival among such patients is, unfortunately…

…is reflected and the remainder continues through the tissues. Depending on the difference in acoustic impedance between the tissues, the angle of the ultrasound wave…

…ultrasound machine for analysis. The reflected sound waves will have the same speed as the emitted sound waves, but the amplitude, frequency and angle of…

…in and shifting focus is that the zoom encloses a specific region of the image, whereas shifting focus simply adjusts the location (along the ultrasound…

…and ultrasound physics Unlike light waves, which can propagate through vacuum, sound waves can only propagate through a physical medium. This medium may consist of…

…Visualization of reflected ultrasound waves. It is in the transition from one tissue to another that most sound waves are reflected and this gives tissue…

…heart and vessels A liquid flowing in a straight cylinder exhibits laminar flow , which implies that the flow velocity is highest at the center of…

…of the ultrasound lines decreases with increasing distance from the transducer; this affects the lateral resolution as explained in Figure 3. Figure 3. Axial and…

…Doppler (CW Doppler), ultrasound waves are continuously emitted from the transducer and the reflections of these waves are analyzed continuously (Figure 1). This is possible…

…short pulses of ultrasound and analyzes reflected sound waves between the pulses. This is accomplished by using the same piezoelectric crystals to send and analyze…

…itself is straightforward: ultrasound to find the fluid, an insertion site in the left lower quadrant lateral to the rectus sheath, and a cell count…

…and intubation can precipitate circulatory collapse in a tamponaded patient , since positive airway pressure further reduces the venous return. Procedure Choice of access The ultrasound…

…the procedure is life saving and necessary respectively. Otherwise: Type Contraindication : : Absolute No safe pocket of fluid to puncture (no ultrasound verified fluid) Relative Uncorrected…

…occult structural abnormality. IVUS IVUS generates images by transmitting ultrasound from an intracoronary catheter and recording echoes reflected from the vessel wall. Contemporary systems use…

…one of few EM blogs with up to date research discussions. EMcrit Superb website by Dr Scott Weingart. Frequently updated, evidence based, clinically oriented and…

…and ultrasound studies are now performed in the majority of patients with stroke or TIA. The purpose of performing an ultrasound is to scrutinize potential…

…assessment of ventricular hypertrophy and cardiomyopathy. Numerous formulas have been developed to approximate ventricular mass. Most formulas are simple mathematical equations, included in all ultrasound…

…single ultrasound line, its temporal and axial resolution is very high, as compared with 2D echocardiography. M mode is useful for quantifying the mobility of…

…obvious benefits of performing emergency bedside examinations, regardless of image quality. The ultrasound transducer is held at the tip, using the thumb and the forefinger…

…structure and function. Ultrasound imaging, including echocardiography, has become a standard tool for clinicians worldwide (Narula et al). This chapter discusses the principles of the…

…systole and diastole alter the frequency of ultrasound waves that are reflected back to the transducer. There are two fundamental differences between blood and myocardium…

…Ultrasound also shows the depth of the cavity and its distance to vessels. Contraindications and when to involve a surgeon The following locations must not…

…Preparation and equipment Equipment: a handheld Doppler probe 5–10 MHz, ultrasound gel, a blood pressure cuff of the correct size (the width should correspond…

…However, intravascular ultrasound has shown that delayed opening of the bridged segment may extend into diastole, so the physiological effect is not limited to systole…

…margins and a narrow neck. These findings may reflect plaque disruption or thrombus. A rounded or polypoid intraluminal mass and lesion haziness raise suspicion of…

…syndrome, stress testing may be considered after at least 24 hours of stabilization, provided that active ischaemia and haemodynamic or electrical instability are absent. A…

…the speed and direction of myocardial motion. This is possible because myocardium also reflects ultrasound waves. In order to analyze myocardial motion, the ultrasound system…

…orientation of the index marker and the scanning plane through the heart. Figure 2. PLAX, Parasternal Long Axis View. Position of the transducer : The ultrasound…

…With regards to echocardiography and ultrasound imaging in general, v is the maximum velocity measured using Doppler. Moreover, the first part of the formula (0…

…anaesthetic also improves the chance of success by counteracting vascular spasm. Pressure monitoring set: stiff, short tubing, a transducer, and a flush system with physiological…

…studies and ferritin, ANA, SMA, AMA, IgG subclasses, caeruloplasmin in people under 40, alpha 1 antitrypsin, TSH and coeliac serology , together with ultrasound of the…

…in three lengths: short for children and slim limbs, medium for most adults, long for thick soft tissue and for the head of the humerus…

…cent. An sPESI of 0 indicates low risk. Anticoagulation A DOAC is the first choice in pulmonary embolism without malignancy and without antiphospholipid syndrome. The…

…not calcified and therefore cannot be identified reliably by radiography. Assessment should include consideration of associated vascular disease. In patients with AAA, duplex ultrasound screening…

…or dissection. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) can reveal lesions that are not apparent on conventional angiography. Coronary vasomotor disorders may involve…

…Large variations in velocities recorded within a single sample volume indicate turbulent flow; the ultrasound machine is programmed to depict such flows with green color…

…difference between emitted and reflected ultrasound waves is analyzed. This difference is called Doppler shift . The Doppler shift depends on the velocity of blood flow…

…endocarditis. With 2D and later 3D ultrasound, the technology has been greatly refined. Similarly, the development of transesophageal echocardiography (TEE) has been extremely valuable. Echocardiography…

…some fixation of the heart in the mediastinum. The heart is fixed to the larger vessels and diaphragm, which stabilizes the position of the heart…

…recording of VTI using pulsed wave doppler in the aortic valve. Figure 2. VTI (Velocity Time Integral) is the area within the spectral curve and…