calf vein duplex imaging - ncusncus.org/files/fall2016/stull.pdfisolated calf vein thombi 75...
TRANSCRIPT
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Deep Vein Imaging
in the Calf
Brian Stull, RDMS, RVT
REX Vascular Specialists
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Objectives
Anatomy of the deep veins of the calf
Where do we look for DVT?
Location of vessels and their interaction
Identification of DVT within vessels.
How do I know?
Approaching the deep calf veins
How do I get better images?
When do I know that I just can’t see the calf veins?
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Challenges of Calf Vein Imaging
Identification
Which veins are which? Anatomy
What is the best way to approach the calf veins?
Patient positioning
Using the right equipment
What does calf vein DVT look like?
How important is calf vein DVT?
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Approaching Calf Veins
Most venous duplex exams start with the patient in a near supine position with the leg slightly externally rotated.
A 30 degree reverse Trendelenberg positioning.
Calf veins best imaged in a more extreme reverse Trendelenberg position.
Seated upright.
Lower leg over side of bed.
Hydrostatic pressure = gravity = better visualization.
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Duplex is the Best
Duplex ultrasound examination has evolved to become the imaging method of choice for investigating calf vein thrombosis. Most vascular laboratories in France routinely assess the calf deep veins in patients suspected of having an acute deep vein thrombosis (DVT) of the lower limbs.4
Given the rapid advances in its resolution and widespread availability CFDU has supplanted contrast venography as the imaging method of choice for diagnosis of CVT. Including thrombosis involving the veins draining the gastrocnemius and soleal muscles.1
Duplex scanning frequently detects thrombi in ‘muscular veins’ and rarely distinguishes between soleal and gastrocnemius veins.2
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Patient Positioning
Cannot be stressed enough!
Use the exam bed or table to your advantage!
Reverse Trendelenburg
Raise the head of the bed!
Reposition the Patient!
Prop the thigh to get the calf off the bed!
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Proof Positive
(in a negative way)
S
U
P
I
N
E
R
E
V
E
R
S
E
T
B
E
R
G
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Transducers
Superficial Imaging Deep Imaging
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Try another tool
What is the old
saying? “If it doesn’t
fit, get a bigger
hammer.”
Haines, Alaska
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Leg dependent over side of bed
9MHz Linear 4MHz Curved
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We have to be realistic though
Sometimes it just isn’t going to happen, and very
likely isn’t really that necessary.
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Knowing the Anatomy
C
A
L
F
POPLITEAL
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Deep Veins of the Calf
Anterior Tibial Veins*
Posterior Tibial Veins*
Peroneal Veins*
* Receive blood from sole of the foot
Gastrocnemius Veins (muscular)
Soleal Veins (muscular)
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Gastrocnemius Anatomy
Veins run through the two heads of the gastrocnemius muscle.3
Medialis and Lateralis.3
Vein pairs connect forming one vein pouring into the popliteal vein.3
87% of main gastrocnemius trunks drained into the popliteal vein.2
2/3 of main gastrocnemius trunks contained valves at some point.2
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Anatomy: Gastrocnemius Veins
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Soleal Vein Anatomy
Comprised of over ten multi-branched veins.3
Centralis, medialis, lateralis. 3
Veins combine (confluence) to form larger
veins. 3
Centralis of the soleal vein pours into the
peroneal vein and posterior tibial vein or lower
part of the popliteal trunk. 3
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Anatomy: Soleal Veins
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Soleal Vein Termination Points
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Anatomy: Posterior Tibial and
Peroneal Veins
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So Where Is the “Trifurcation”?
3
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What veins and pathology can we
find? Posterior Tibial
Generally paired
Peroneal
Generally paired
Gastrocnemius
Medial Head most commonly imaged as lateral head
will be deep to medial head from medial approach
If patient says the lateral calf hurts, look there!
Soleal
Soleus muscle extends length of the calf
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IGSVT
Isolated Gastrocnemius and Soleal Vein Thrombosis 1
Study from Tokyo, Japan 1
No systemic anticoagulation.
135 limbs with IGSVT studied for 3 months.
16.3% propogated to tibial or peroneal veins or higher.
3% propogated into popliteal vein.
90.9% IGSVT propogated within 2 weeks.
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Etiology of Gastrocnemius DVT
Achilles tendon trauma.
Arthroscopic Knee Surgery.
Unsure why, but these two presenting factors
seem to increase the risk in my experience.
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Pre-op Literally
Patient presented from orthopedic office with
calf pain and swelling.
Achille’s rupture needing surgery.
Surgery was put off for duplex to be done.
Patient had been prepped, had been given a
nerve block and lower leg was numb.
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Gastrocnemius Trunks
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Gastrocnemius Near Pop Pre-op
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Gastrocnemius DVT
37 year old male with a history of superficial
thrombophlebitis in the left greater saphenous vein one
year prior, which responded well to conservative
therapy (Aspirin and antibiotics).
Presents with calf pain following a left Achille’s tendon
injury while moving furniture for which he has been
wearing a boot with limited walking and weight bearing.
2 Venous Duplex studies done 2 days apart.
Starting taking 81mg Aspirin after first study.
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Mid Left Calf
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Gastrocnemius and Popliteal
Confluence
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48 Hours Later
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Transverse Compressions
August 22nd August 24th
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Peroneal Vein DVT
Reason for visit: Chest Pain.
Left achilles tendon surgery 5 weeks
ago.
Ruptured achilles while boating in
Canada (air travel).
Non-weight bearing for 4 weeks post-
op.
Prescribed crutches, used scooter to
get around.
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Isolated Peroneal Vein DVT
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Not-so Isolated Peroneal DVT
Multiple segmental filling
defects involving
segmental branches of
the right lower lobe
pulmonary artery
consistent with
pulmonary embolism.
Full anti-coagulation.
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Arthroscopy
S/P Right knee arthroscopic meniscus repair.
“Cramping” in calf.
Noticed right foot was swollen.
Foot swelling went down after taking off the
post surgical wrapping.
Calf still sore.
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Posterior Tibial Vein
Transverse Compressions in Proximal Calf
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PTV Sagittal
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Don’t squeeze too hard!
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Gotta go on a Trip
Puerto Rico.
I want to drink.
And take part in other local customs.
Air travel.
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Full Anti-Coag 41 days later
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If at first you don’t succeed
Duplex gives us the option of follow up studies.
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Trying again
Patient done at another facility 4 days prior to
this exam and there was no reported DVT, just
stated that calf veins were not well visualized
and recommended MRV.
Radiologist called referring physician and
recommended duplex exam as MRV would not
properly diagnose lower leg DVT and could lead
to thrombophlebitis.
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Popliteal Vein Compressions
Proximal Mid
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Distal Popliteal Vein Transverse
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Distal Popliteal Vein Color
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Posterior Tibial Vein
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PTV to Trunk to Popliteal
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Soleal Vein to PTV
Moving caudal from proximal calf Moving cephalad from mid calf
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Path of an unprovoked
Popliteal Vein DVT
Soleal Sinus Posterior Tibal Vein Tibial
Trunk Popliteal Vein
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Next stop Popliteal Vein
42 year old female with
calf pain.
Birth control.
Sedentary job.
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Peroneal Vein DVT
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Isolated Calf Vein Thombi
75 patients prospectively monitored with sequential scans 3 to 4 day interval. 8
32% propagated; 46% of these into popliteal or larger veins of thigh. 8
Proximal soleal vein thrombi had the highest incidence in both propagating and non-propogating groups. 8
5% had highly probable ventilation perfusion scans as their initial indication for duplex scanning. 8
DVT isolated to the calf is not a benign problem. 8
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Pulmonary Embolism
85 year old female recently diagnosed with myasthenia gravis (neuromuscular disorder), which causes weakness.
Per patients H&P at admit she has not been very active and basically sitting or lying around the house.
Came in with shortness of breath, had chest CT which was positive for right truncus anterior and right lower lobe pulmonary emboli.
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Bilateral Lower Extremity Doppler
Lower extremities negative for DVT in CFV, FV, Popliteal, PTV and Peroneal veins.
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PTV and Peroneal Veins
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Soleal Vein
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Appears Isolated
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Why is the Soleal Vein Important?
The soleal muscle works only at the ankle
joint. 3
The soleal muscle would not be activated
…prolonged sitting, e.g.,… a hospital stay or
long plane flights… 3
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Positive Chest CT
Patient present to ED with shortness of breath
and chest pain.
Being treated for metastatic colorectal cancer to
the liver and lungs.
Venous Dopplers are ordered.
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Distal Calf
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Soleal to Peroneal?
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Extensive Soleal DVT
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Prevalence of calf DVT6
Location No. of limbs
Peroneal vein 115 (41%)
Soleal vein 109 (39%)
Posterior tibial vein 105 (37%)
Gastrocnemial vein 79 (28%)
282 total limbs studied
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Prevalence of calf DVT
in a single or paired vein alone6
Location of thrombus No. of limbs
Soleal alone 57 (20%)
Gastrocnemial alone 48 (17%)
Peroneal alone 42 (15%)
Posterior tibial alone 35 (12%)
Total 182 (64%)
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Treating Calf Vein DVT (CVT)
Anatomical characteristics and physiological
mechanisms play a major role in the occurrence and
propagation of venous thrombi. Thus, and
understanding of these features is essential for
effective prophylaxis of venous thromboembolism.3
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Risk Factors
1. Cardiac disease (CAD, CHF, Artial or Ventricular Arrhythmia)
2. Cancer (local or metastatic)
3. Hypercoagulable state (pregnancy/postpartum, estrogen supplementation, protein C/S/antithrombin deficiency, factor V Leiden mutation)
4. Recent surgery (general/orthopedic/vascular/ gyn)
5. Trauma
6. Venous Disease (varicose veins, stripping, previous DVT or PE
Virchow’s Triad
7. Venous Stasis
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Who gets treated?
Etiology is important.
Fracture (includes joint replacements)
Cancer (chemotherapy, radiation)
Unprovoked = Treat? At least follow up.
Small burden in isolated segment.
Surgery with temporary immobility or non-
weight bearing status.
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How are they treated?
High dose NSAIDs.
Aspirin.
Antibiotics.
Serial Duplex scans.
IVC Filter.
Anticoagulation.
Full cycle.
Abbreviated cycle.
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Contraindications for
Anticoagulation
Bleeding. Intracranial
Active
Ulcers
Falls risk
Recent surgery. Brain
Eye
Spinal Cord
Malignant hypertension.
Drug interactions.
Severe thrombocytopenia.
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Risks of Anticoagulation
Bleeding.
With the advent of low-molecular-weight heparin
(Lovenox), the risk-benefit ratio moves further in the
dirction of treating CVT with anticoagulation, because
complications from heparin treatment are minimized. 8
Inconvenience.
With the development of outpatient home monitoring and
the self-administration of subcutaneous low-molecular-
weight heparin, anticoagulation therapy is far more cost
effective than serial duplex scans. 8
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Issues from CVT
Pulmonary Embolism.
Study from Tokyo investigating … fatal cases of acute massive PTE in forensic autopsy.3
Results indicated highest frequency of [calf] DVT especially at soleal vein.3
Proximal DVT (propagation).
Venous Reflux.
Pain.
Edema.
Hemosiderin staining.
Venous stasis ulcers.
Infection.
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So what do they think in Seattle?
The natural history of CVT is complicated by
persistent symptoms and the development of valvular
incompetence in approximately one-quarter of patients.
This potential for persistent lower extremity symptoms
should be considered in evaluating the clinical relevance
of isolated calf vein DVT.5
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Serious Complications
105 patients with isolated CVT and
symptoms.7
26 patients had respiratory symptoms.7
9 had PE.7
2 died.7
35% of patients who had both isolated CVT
and respiratory symptoms had PE.7
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Conclusion
Calf vein DVT is a clinically relevant finding and should be taken very seriously.
DVT in the gastrocnemius and soleal veins is important to identify (and ultrasound is the way to find it!).
Treating calf vein DVT requires a good understanding of the patient’s health history and unique circumstances.
ICAVL requirements of calf vein interrogation are there for a reason.
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Reference Articles1. Short-term natural history of isolated gastrocnemius and soleal vein thrombosis, P.S.
MacDonald, et al Montreal, Quebec, Canada 2003 The Society for Vascular Surgery and The American Association for Vascular Surgery 523-527
2. Anatomical Study of the Gastrocnemius Venous Network and Proposal for a Classification of the Veins J.A. Aragao, et al Departments of Anatomy, Tiradentes University, Sergipe, and Surgery Federal University of Sao Paulo, Sao Paulo, Brazil Eur J Vasc Endovasc Surg 31, 439-442 (2006)
3. Significance of the Soleal Vein and its Drainage Veins in Cases of Massive Pulmonary Thromboembolism Norimasa Kageyama, et al Tokyo, Japan Ann of Vasc Dis Vol. 1, No. 1; 2008; pp35-39
4. Short-term and mid-term outcome of isolated symptomatic muscular calf vein thrombosis Jean-Luc Gillet, MD, et al Bourgoin, Chassieu, and Dijon, France Journal of Vascular Surgery Sept. 2007 Vol 46, No 3 pp.513-519
5. Early outcome after isolated calf vein thrombosis Markk H. Meissner, et al Seattle, Wash. Department of Surgery, University of Washington School of Medicine
6. Patterns and distribution of isolated calf deep vein thrombosis Nicos Labropoulos, PhD, DIC, RVT, et al Maywood and Park Ridge, Ill Journal of Vascular Surgery Nov. 1999 p.787-793
7. Pulmonary embolism is associated with combination of isolated calf vein thrombosis and respiratory symptoms Passman MA, et al J Vasc Surg. 1997 Jan; 25(1): 39-45
8. Lower extremity calf thrombosis: to treat o not to treat? Lohr et al J Vasc Surg 1992 Feb;15(2):323.