dural AV fistula CVT recurrent cerebral venous thrombosis mechanism pathophysiology DSA 2024

mkdir -p /home/daytona/workspace/davf-ppt && ls /home/daytona/workspace/davf-ppt…

~/davf-ppt/build.js

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pres.title = "Dural Arteriovenous Fistula (DAVF)";
pres.author = "Neurology CME";

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// ─────────────────── SLIDES ───────────────────

// 1. Title
titleSlide();

// 2. What is DAVF?
bulletSlide("What is a Dural Arteriovenous Fistula?", [
  "Abnormal arteriovenous shunting contained within the leaflets of the dura mater",
  "Nidus of abnormal arteries and veins — no intervening capillary bed",
  "Usually fed by dural branches of the external carotid artery (ECA) + internal carotid artery (ICA)",
  "Also fed by muscular branches of the vertebral artery",
  "Venous drainage directed primarily to dural venous sinuses",
  "Accounts for ~6% of supratentorial and ~35% of posterior fossa vascular malformations",
  "Peak incidence: 5th–6th decade; no gender predilection",
  "Most are idiopathic; some acquired (trauma, venous sinus thrombosis)",
]);

// 3. Pathogenesis
bulletSlide("Pathogenesis", [
  "Unlike brain AVMs, many DAVFs are ACQUIRED (not developmental)",
  "Venous sinus thrombosis → venous hypertension → angiogenic stimulus",
  "Enlargement of pre-existing physiological arteriovenous micro-shunts in dura",
  "Neoangiogenesis driven by VEGF and HIF-1α released by ischemic dural tissue",
  "Sinus wall thickening → stenosis → further venous stasis → thrombosis",
  "Trauma / craniotomy → local inflammatory/angiogenic cascade",
  "Associated conditions: Klippel-Trenaunay, Osler-Weber-Rendu syndromes",
  "Thrombogenic risk factors (Factor V Leiden, hyperhomocysteinemia) implicated",
]);

// 4. DAVF ↔ CVT Bidirectional Link
sectionDivider("DAVF & Recurrent CVT", "A vicious bidirectional cycle");

bulletSlide("Why DAVF Causes Recurrent CVT", null, [
  {
    heading: "MECHANISM 1: Venous Hypertension",
    items: [
      "High-pressure arterial blood shunted into dural sinuses",
      "Raised venous pressure → sluggish flow → stasis",
      "Stasis = prothrombotic milieu → de novo sinus thrombosis",
      "Thrombus often in same or adjacent sinus as fistula",
      "Cycle: DAVF → CVT → worse venous outflow → DAVF progression",
    ],
  },
  {
    heading: "MECHANISM 2: Cortical Venous Reflux",
    items: [
      "High-grade DAVF (Borden II/III) redirects flow retrograde into cortical veins",
      "Cortical venous congestion → endothelial damage → thrombosis",
      "Recurrent CVT at new sites due to propagating venous pressure wave",
      "CVR = strongest predictor of hemorrhage and recurrence",
      "Partial treatment without CVR disconnection leaves the cycle incomplete",
    ],
  },
  {
    heading: "MECHANISM 3: Sinus Stenosis",
    items: [
      "Dural sinus wall thickens as DAVF matures",
      "Progressive stenosis narrows outflow → raises upstream pressure",
      "Turbulent, slowed flow in the affected sinus predisposes to re-thrombosis",
      "Spontaneous partial DAVF occlusion can paradoxically trigger acute CVT",
      "Studies show CVT in ~28% of DAVF patients (ACTION-CVT 2024)",
    ],
  },
]);

// 5. Classification
sectionDivider("Classification Systems", "Borden & Cognard");

boxSlide("Borden Classification (1995)", [
  { label: "Type I", text: "Drainage into a dural venous sinus or meningeal vein\nNormal anterograde flow\nUsually BENIGN — low hemorrhage risk", color: "143D24" },
  { label: "Type II", text: "Anterograde drainage into sinus + RETROGRADE flow into cortical veins\nIntermediate risk — may present with hemorrhage or venous infarct", color: "7A3B00" },
  { label: "Type III", text: "Direct retrograde flow into cortical veins ONLY\nSevere venous hypertension\nHIGH hemorrhage and CVT risk", color: "5C0000" },
]);

boxSlide("Cognard Classification (1995)", [
  { label: "Type I", text: "Anterograde flow in a dural sinus — Benign", color: "143D24" },
  { label: "Type IIa", text: "Drainage into sinus + retrograde flow within the sinus", color: "2A3D14" },
  { label: "Type IIb", text: "Drainage into sinus + retrograde flow into cortical veins", color: "7A3B00" },
  { label: "Type IIa+b", text: "Both retrograde sinus flow AND cortical venous reflux", color: "7A3B00" },
  { label: "Type III", text: "Direct drainage into cortical vein — no ectasia", color: "5C0000" },
  { label: "Type IV / V", text: "IV: Cortical vein + ectasia >5mm\nV: Drains into spinal perimedullary veins", color: "5C0000" },
]);

// 6. Clinical Features
sectionDivider("Clinical Features", "Presentation varies by location & venous drainage pattern");

bulletSlide("Clinical Features by Location", null, [
  {
    heading: "Cavernous Sinus DAVF",
    items: [
      "Proptosis / chemosis",
      "Pulsatile exophthalmos",
      "Ophthalmoplegia (CN III, IV, VI)",
      "Raised intraocular pressure",
      "Orbital bruit / headache",
    ],
  },
  {
    heading: "Transverse / Sigmoid Sinus DAVF",
    items: [
      "Pulsatile tinnitus (most common symptom)",
      "Headache",
      "Papilledema (raised ICP)",
      "Hearing disturbance",
    ],
  },
  {
    heading: "SSS / Cortical DAVF (High-Grade)",
    items: [
      "Seizures",
      "Focal neurological deficits",
      "Cognitive decline / dementia",
      "Intracerebral / SAH / subdural hemorrhage",
      "Venous infarcts — recurrent CVT",
    ],
  },
]);

bulletSlide("Additional Clinical Syndromes", [
  "Pseudotumor cerebri phenotype: headache + papilledema + vomiting (venous outflow obstruction)",
  "Thalamic venous congestion → rapidly progressive dementia (rare)",
  "Brainstem DAVF → lower cranial nerve palsies, cerebellar signs",
  "Anterior cranial fossa DAVF → highest bleeding risk (ethmoidal feeders)",
  "Tentorial DAVF → also high hemorrhage risk",
  "Pediatric high-flow DAVF → congestive heart failure (vein of Galen type)",
  "Cranial bruit audible to patient or examiner (uncommon)",
  "Ischemic-like fluctuating deficits — spinal DAVF mimics myelopathy",
]);

// 7. Investigations
sectionDivider("Investigations", "Non-invasive → Gold Standard");

boxSlide("Investigations Overview", [
  { label: "MRI Brain", text: "Flow voids in dural sinuses or cortical veins\nWhite matter T2 hyperintensity (venous hypertension)\nDilated perimedullary / pial veins\nGadolinium: dural thickening / enhancement near sinus", color: "1B2A3B" },
  { label: "MR Angiography (MRA)", text: "Time-of-flight MRA: may show early venous filling\nTime-resolved MRA (TRICKS/TWIST): dynamic arteriovenous shunting\nLess sensitive than DSA for low-flow fistulas", color: "1B2A3B" },
  { label: "CT Angiography (CTA)", text: "Dilated dural sinuses, enlarged cortical veins\nBone window: enlarged foramina (enlarged dural artery)\nCT venography for sinus occlusion\nMissed in ~40% of low-flow DAVFs", color: "1B2A3B" },
  { label: "Doppler / TCD", text: "Carotid duplex: high-flow arteriovenous shunt\nTranscranial Doppler: high diastolic velocity in MCAs\nOrbital Doppler: reversed flow in superior ophthalmic vein (CCF)", color: "1B2A3B" },
  { label: "DSA (Gold Standard)", text: "Mandatory for definitive diagnosis & pre-treatment planning\nSee DSA slide for full details", color: "2A0A0A" },
  { label: "Lab Work", text: "CBC, coagulation screen (PT/aPTT)\nThrombophilia screen: Factor V Leiden, protein C/S, antithrombin III, antiphospholipid antibodies\nD-dimer (supports CVT diagnosis)\nHomocysteine levels", color: "1B2A3B" },
]);

// 8. DSA - dedicated section
sectionDivider("Digital Subtraction Angiography", "The Gold Standard for DAVF");

bulletSlide("DSA in DAVF — Why It Is Indispensable", [
  "DSA is the GOLD STANDARD — most accurate method for diagnosis and pre-treatment planning",
  "Provides definitive characterization of angioarchitecture and venous outflow pattern",
  "Detects low-flow fistulas missed by CTA and MRA (sensitivity ~100%)",
  "Early venous opacification ('early vein sign') is the hallmark finding",
  "Rapid transit of contrast due to high-flow arteriovenous shunting",
  "High-flow connections may be missed if images not captured in early arterial phase",
  "All feeding vessels must be individually opacified — each segmental artery injected",
  "DSA can be augmented by flat-detector CT angiography (3D reconstruction)",
]);

bulletSlide("DSA Technique for DAVF", [
  "Standard 4-vessel DSA: bilateral ICA + bilateral ECA injections minimum",
  "Additional vertebral artery injections if posterior fossa DAVF suspected",
  "For spinal DAVF: selective injection of each segmental artery at relevant levels (tedious but mandatory)",
  "Roadmap images to plan microcatheter navigation for embolization",
  "Venous phase images — critical to map retrograde cortical venous reflux",
  "Carotid compression maneuver (Mehringer-Hieshima): inject vertebral while compressing ipsilateral CCA — helps localize CCF",
  "Post-treatment DSA mandatory to confirm complete fistula obliteration",
  "Flat-detector CT (FDCT) provides 3D roadmap during endovascular procedures",
]);

bulletSlide("DSA Findings in DAVF", [
  "EARLY VEIN sign: opacification of draining vein in arterial phase",
  "Nidus in dura near a large venous sinus (convexity, tentorial incisura, cavernous sinus)",
  "Enlarged feeding dural arteries from ECA (occipital, middle meningeal, ascending pharyngeal)",
  "ICA dural branches: tentorial artery of Bernasconi-Cassinari, anterior meningeal",
  "Retrograde cortical venous filling = high-grade (Borden II/III; Cognard IIb–IV) — high risk",
  "Venous ectasia / varix = Cognard Type IV — very high hemorrhage risk",
  "Sinus occlusion / thrombosis in adjacent sinus (confirms DAVF-CVT link)",
  "Post-embolization: obliteration of venous pouch and outflow tract confirms cure",
]);

// 9. Management
sectionDivider("Management", "Endovascular · Surgical · Radiosurgery");

boxSlide("Management Strategy", [
  { label: "Conservative (Borden I)", text: "Angiographically benign (Type I) with no cortical venous drainage\nObservation + serial MRI/MRA at 6–12 months\nAnticoagulation if concurrent CVT — role uncertain in fistula itself\nCarotid-manual compression therapy (for low-flow CCF)", color: "143D24" },
  { label: "Endovascular Embolization (1st Line)", text: "Preferred at most institutions\nTransarterial route: Onyx / nBCA liquid embolic ± thrombogenic coils\nTransvenous route: coil packing of draining sinus\nGoal: obliterate venous pouch + outflow tract\nIf normal drainage via sinus — selective CVR disconnection only", color: "1B3A5C" },
  { label: "Surgical Disconnection", text: "Preferred for small, accessible lesions\nMandatory for anterior cranial fossa DAVFs (ethmoidal feeders from ophthalmic artery — not embolizable)\nSurgical ligation of cortical draining vein achieves cure\nReserved when endovascular fails or is not feasible", color: "1B3A5C" },
  { label: "Stereotactic Radiosurgery (SRS)", text: "Gamma Knife / CyberKnife\nUsed alone or adjunct after partial embolization\nObliteration occurs over 2–3 years\nInherent interim hemorrhage risk during latency period\nBest for surgically/endovascularly inaccessible lesions", color: "3A1B5C" },
  { label: "Treating Concurrent CVT", text: "Anticoagulation (LMWH → warfarin or DOAC)\nReverse underlying prothrombotic cause\nSeizure control (if present)\nICP management (acetazolamide, CSF diversion)\nTreat DAVF to remove the source of recurrent thrombosis", color: "5C0000" },
  { label: "Follow-Up", text: "Post-treatment DSA to confirm occlusion\nAnnual MRA/CTA for at least 3 years after CVT diagnosis\nHigh-risk patients: smokers, thrombophilia — close surveillance\nRecurrence reported — re-embolization or radiosurgery may be needed", color: "1B2A3B" },
]);

// 10. Key Take-Home Points
bulletSlide("Key Take-Home Points", [
  "DAVF = acquired arteriovenous shunting within dura, most commonly near a dural venous sinus",
  "CVT and DAVF have a BIDIRECTIONAL relationship — each can cause or perpetuate the other",
  "Cortical Venous Reflux (CVR) is the single most important risk factor for hemorrhage and recurrent CVT",
  "Borden/Cognard classification guides prognosis and urgency of treatment",
  "DSA is gold standard — all feeding vessels must be individually opacified; early vein sign is pathognomonic",
  "Embolization (Onyx/nBCA, transarterial or transvenous) is the preferred first-line treatment",
  "Surgical disconnection is mandatory for anterior cranial fossa DAVFs (ethmoidal feeders)",
  "After CVT: annual non-invasive imaging for ≥3 years — high-risk patients need long-term follow-up",
  "Complete obliteration of venous pouch + CVR disconnection = treatment endpoint",
]);

// Save
pres.writeFile({ fileName: "/home/daytona/workspace/davf-ppt/DAVF_Presentation.pptx" })
  .then(() => console.log("PPT saved successfully."))
  .catch(e => console.error("Error:", e));

cd /home/daytona/workspace/davf-ppt && node build.js 2>&1

ls -lh /home/daytona/workspace/davf-ppt/