fetalvascularmalformations

fetalvascularmalformations - Fetal Vascular Malformations...

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Fetal Vascular Malformations Panic-free Guide to (Sometimes Scary) Vascular Problems of the Fetus Martin Necas Department of Ultrasound Waikato Hospital, Hamilton NZ ASUM Annual Scientific Meeting Queenstown 2001
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Fetal Vascular System: What can we see? Remarkable Detail from Head to Toe! AO, INNOMA, SCA, AXA, BRA, RADA, ULNA, CIA, IIA, UA, EIA, CFA, SFA, DFA, POPA, PTA, PERONA, CELIAC, SMA, HEA, RA, SPLA, CCA, ECA, ICA, MCA, ACA, Pericalossal A, ACoA, PCoA, PCA, VERTA, BASA, IVC, SVC, INNOMV, SCV, AXV, BRV, RADV, ULNV, RV, CIV, IIV, UV, DV, EIV, CFV, SFV, DFV, POPV, PTV, PERONV, SMV, SPLV, MPV, LPV, RPV, HEVs, IJV, Microciculation in: placenta, kidneys, lungs
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Fetal Vascular System: What can we see?
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Vascular Malformations? Cardiovascular problems common Vascular problems vary in incidence Common: 2VC Less common: Umbilical Vein Varix Bizzaire: Hepatic AV Malformation Overall considered rare Topics: Arterio-Venous Malformations and Hemangiomas Cord Anomalies Placental Vascular Issues Vascular Problems of Twinning
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Doppler refresher Use Color/Power Dop. to determine anatomy Use Spectral Doppler to study flow characteristics Use in conjunction with color Dop. Sample in center stream Doppler Angle 60º (ideally 0º) For velocity measurements angle-correct unless 0º approach Angle-correction not necessary for ratios Adjust Scale, Gain, Gate, Filter settings
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Spectral Waveforms Low Resistance Vital Organs (Brain, Umbilical Artery) Mixed Resistance Distribution vessels (Aorta, CCA, CIA) High Resistance Extremities (Brachial A, PTA)
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Velocity versus Ratios Velocity Measurements: absolute values Ratios: reflect waveform characteristics SD=S/D Advantage: easy RI=(S-D)/S Advantage: easy PI=(S-D)/Mean Advantage: Better representation of Doppler Waveform
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What to do when a vascular malformation is suspected? Identify Anomalous vessel Inflow vessels Outflow vessels Relational anatomy Determine flow characteristics of malformation Abnormal vascular channels? Resistance / velocity is decreased, increased, or normal?
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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fetalvascularmalformations - Fetal Vascular Malformations...

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