Bedside Ultrasound in Critical Care Practice
Mazen Kherallah, MD, FCCPInfectious Disease and Critical Care
US Basics
US Basics
Normal Ultrasound Pattern
The pleural line (white arrow) is a roughly horizontal hyperechoic line 0.5 cm below the upper and lower ribs identified by acoustic shadow (R). A single vertical artifact arising from the pleural line and spreading up to the edge of the screen (comet-tails, indicated by asterisk) can be seen in dependant regions in normally aerated lungs
Normal Ultrasound Pattern
'lung sliding' associated with artifactual horizontal A-lines
Rib Fracture
Ultrasound Aspects of Alveolar-Interstitial Syndrome
B-lines 7 mm apart or spaced comet-tail artifacts. The pleural line (white arrow) and the ribs (R) with their acoustic shadow. B-lines arising from the pleural line and spreading up to the edge of the screen correspond to thickened interlobular septa .
Ultrasound Aspects of Alveolar-Interstitial Syndrome
B-lines 7 mm apart or spaced comet-tail artifacts. These artifacts correspond to thickened interlobular septa .
Ultrasound Aspects of Alveolar-Interstitial Syndrome
B-lines 3 mm or less apart. The pleural line (white arrow) and the rib (R) with their acoustic shadow. Contiguous comet-tails arising from the pleural line and spreading up to the edge of screen correspond to ground-glass areas on chest CT scan.
Ultrasound Aspects of Alveolar-Interstitial Syndrome
B-lines 3 mm or less apart. The pleural line (white arrow) and the rib (R) with their acoustic shadow. Contiguous comet-tails arising from the pleural line and spreading up to the edge of screen are present. These artefacts correspond to ground-glass areas on chest CT scan.
Ultrasound Aspect of a Lung Consolidation and Pleural Effusion
Transversal view of consolidated left lower lobe; lung consolidation is seen as a tissular structure (C). In this consolidation, hyperechoic punctiform images (indicated by asterisk) can be seen; these correspond to air bronchograms (air-filled bronchi). Pleural effusion is anechoic (Pl). .
Ultrasound Aspect of Lung Consolidation and Pleural Effusion
Cephalocaudal view of consolidated left lower lobe: lung consolidation with air bronchograms. Ao, descending aorta; D, diaphragm; Pl, pleural effusion..
Ultrasound Aspect of Lung Consolidation and Pleural Effusion
Cephalocaudal view of consolidated left lower lobe: lung consolidation with air bronchograms.
Consolidated Left Lower Lobe with a Peripheral Abscess.
The abscess (A) appears as rounded hypoechoic lesions inside a lung consolidation (C). Ao, descending aorta; D, diaphragm; Pl, pleural effusion..
Consolidated Left Lower Lobe with a Peripheral Abscess.
The abscess (A) appears as rounded hypoechoic lesions inside a lung consolidation (C). Ao, descending aorta; D, diaphragm; Pl, pleural effusion..
Consolidated lung 'floating' in a Massive Pleural Effusion
The pleural effusion (Pl) is abundant enough to be compressive and the lung (C) is seen consolidated and floating in the pleural effusion.
Consolidated Lung and Adjacent Pleural Effusion with Pleural Adherences.
The pleural effusion (Pl) is abundant and the lung is seen consolidated and floating (C) in the pleural effusion with pleural adherences. (A)
Pneumothorax with “Lung Point”
(a) Normal lung and (b) pneumothorax patterns using time-motion mode lung ultrasound. In time motion mode, one must first locate the pleural line (white arrow) and, above it, the motionless parietal structures. Below the pleural line, lung sliding appears as a homogenous granular pattern (a). In the case of pneumothorax and absent lung sliding, horizontal lines only are visualised (b). In a patient examined in the supine position with partial pneumothorax, normal lung sliding and absence of lung sliding may coexist in lateral regions of the chest wall. In this boundary region, called the 'lung point' (P), lung sliding appears (granular pattern) and disappears (strictly horizontal lines) with inspiration when using the time-motion mode
US Sensitivity and Specificity for Pneumothorax
Sensitivity Specificity
CXR 28% 100%
US 87% 97%
Lichtenstein, DA; Meziere, G; Lascols, N; Biderman, P; Courret, JP; Gepner, A; Goldstein, I; Tenoudji-Cohen, M. Ultrasound diagnosis of occult pneumothorax. Crit Care Med. 2005;33:1231–1238.
US Guided Vascular Access
The problem...
• Complications– Pneumothorax– Hemothorax– Arterial puncture– Hematoma formation
• Neck, groin, mediastinum
• Failure to obtain access
Complications
McGee DC, Gould MK. Preventing Complications of Central Venous Catheterization. NEJM 2003;348:1123-33
Ultrasound Guided Vascular Access
• Agency for Healthcare Research and Quality– Making Health Care Safer: A Critical Analysis of
Patient Safety Practices• “Use of real-time ultrasound guidance during central
line insertion to prevent complications”
http://www.ahcpr.gov/clinic/ptsafety/chap21.htm
Ultrasound Guided Vascular Access
“In hospitals where US equipment is available and physicians have adequate training, the use of US guidance should be routinely considered for cases in which IJ venous catheterization will be attempted”
McGee DC, Gould MK. Preventing Complications of Central Venous Catheterization. NEJM 2003;348:1123-33
Adult IJ – US vs Landmark
Failed Catheter Placement US Landmark Relative Risk (95% CI)
Mallory ‘90 0/12 6/17 0.11 (0.01-1.73)Nadig ‘98 0/36 13/37 0.04 (0-0.62)Slama ‘97 0/37 10/42 0.05 (0-0.89)Soyer ‘93 0/24 5/23 0.09 (0.01-1.49)Sulek ’00 3/60 5/60 0.6 (0.15-2.4)Teichgraeber ’97 2/50 26/50 0.08 (0.02-0.31)Troianos ’91 0/77 3/83 0.15 (0.01-2.93)Total 5/296 68/312 0.14 (0.06-0.33)
Hind DH, Calvert N, Davidson A, et al. BMJ 2003
Adult IJ
• Denys et al “randomized” patients to IJ- US guided=928, Landmark=302
• Overall success 100% vs 88.1%• First attempt success 78% vs 38%• Skin to vein time 9.8 (2-68) vs 44.5 (2-1000) sec• Carotid puncture 1.7% vs 8.3%
Denys BG, Uretsky BF, Reddy PS. Ultrasound-assisted cannulation of the internal jugular vein – a prospective comparison to the external landmark-guided technique. Circulation 1993;87:1557-62
Vein Versus Artery
• Artery– Thicker walls– Non-compressible– Pulsatile– (color flow)
• Vein– Thinner walls– Compressible– Non-pulsatile– (color flow)
Ultrasound Access Techniques
• “Static”– mapping technique– no sterile technique required for US
• “Dynamic”– views needle entering vein
• freehand• needle guide
– requires sterile technique
Static Technique
• Position patient as you will for procedure• Look at vessels and confirm landmark-
predicted anatomy• Mark location, note depths and angles• Remove ultrasound, prep patient without
moving• Vein cannulated as usual
Dynamic Technique
• Place gel in palm of sterile glove• Place vascular probe in palm, avoid trapped air
bubbles, and wrap free fingers out of way• Sterile KY jelly for glove-skin interface
Dynamic technique
• Center vessel in center of screen• Center of probe overlies center of vessel and
serves as landmark for needle• Needle creates bright echo with ringdown
artifact• Advance needle to vein, which is deformed by
needle pressure and then recoils to original position as vein is cannulated
Vessel specifics
Internal Jugular
MedialLateral
IJ
Carotid
Internal jugular
MedialLateral
Vascular Access
Internal Jugular
MedialLateral
Focused Assessment with Sonography in Trauma (FAST)
Goals of FAST
• Rapid detection of:– Hemoperitoneum– Hemopericardium– Hemothorax
• Advanced/expanded– rapid detection of pneumothorax– identification of solid organ injury
Standard Views
RUQ Morison’s View
LUQ View Pelvic View
RUQ
RUQ
Head Foot
Liver
Upper polekidney
Lower polekidney
Diaphragm
Free Fluid in Morison’s Pouch
Very rough rule of thumb: 0.5 cm fluid stripe = 500 cc, 1 cm fluid stripe = 1 L
Free Fluid in Morison’s Pouch
Free Fluid in Morison’s Pouch
Pleural Fluid Collection
False + RUQ view
IHepatic Vein
IVC
Subxiphoid
Normal Subxiphoid
LV
RV
RA
LA
Liver
Pericardial Effusion
RV
RA
Effusion
Parasternal long
RV
LV
LVOT
LA
Descending aorta
Aortic valve
Posteriorpericardium
Mitral valve
Parasternal long
• The descending aorta is an important landmark• Regardless of how large a pericardial effusion is, it
will always "tuck in" between the aorta and the heart• Pleural effusions will dive down posterior to the
descending aorta• This distinction is important if you are debating doing
a pericardiocentesis vs chest tube!
Parasternal Long
Aorta
Visceralpericardium Pericardial effusion
tucking between aortaand heart
Parietal pericardium
RV
LV
Thickened septum
Parasternal long
Pleural Effusion
RV
LVLVOT
Aorta
Pleural effusiondiving posterior to aorta
LUQ
• Posterior axillary line at 9th-10th interspace• Breath holds to move spleen down• Tougher view b/c spleen is much smaller
acoustic window than liver, so more gas• If kidney seen but no spleen, slide one
interspace cephalad
LUQ
LUQ free fluidHemoperitoneum Normal splenorenal recess
LUQ – free fluid
LUQ free fluid
LUQ - Fractured spleen
Free fluid
Laceration
Normal splenorenalrecess
Diaphragm
LUQ - free fluid
70 y/o driver of car Tboned on driver's side
Pelvic
• Place probe just superior to symphasis• Sagittal midline - aim beam 0-30 degrees into
pelvis with orientation marker towards head• Transverse midline - rotate 90 degrees to R
and fan up and down
Pelvic
Pelvic free fluid
Free fluid
Pelvic Free Fluid
Pelvic free fluid
Lower uterus
Small amountof physiologicfluid
Critical Care is A Promise
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