Subclavian Steal Syndrome and Vertebral Artery Dissection: Syncope When Exercising One Arm, >20 mmHg Inter-Arm BP Gap, and Cervical Manipulation Stroke¶

Subclavian Steal Syndrome (SSS) and Cervical / Vertebral Artery Dissection (VAD) are two critical vascular emergencies of the posterior circulation (the vertebrobasilar arterial system) that cut off blood flow to the brainstem, cerebellum, and occipital lobes, producing sudden spinning dizziness (vertigo), double vision (diplopia), slurred speech (dysarthria), difficulty swallowing (dysphagia), unsteadiness (ataxia), or sudden fainting (syncope). In Subclavian Steal Syndrome, a severe blockage at the origin of the subclavian artery (usually the left) causes exercising the affected arm to literally suck blood backward down the vertebral artery away from the brainstem, revealing a diagnostic greater than 15 to 20 mmHg systolic blood pressure difference between the two arms (and triggering coronary-subclavian steal chest pain in patients with a left internal mammary artery [LIMA] heart bypass graft). In Vertebral Artery Dissection, a high-velocity chiropractic neck manipulation, whiplash injury, yoga hyperextension, or violent coughing tears the inner lining of the vertebral artery inside the neck bones, stands as a leading cause of posterior circulation stroke (Wallenberg lateral medullary syndrome) in adults under age 45, and almost always starts with a warning unilateral posterior neck or occipital headache. If anyone develops sudden vertigo, double vision, fainting during arm activity, or neurological symptoms after neck pain, call your local brojevi za hitne slučajeve (911 u Sjedinjenim Državama i Kanadi, 112 širom Evropske unije, 999 u Ujedinjenom Kraljevstvu) odmah. Dok čekate hitnu pomoć, pregledajte povezane smjernice stroke recognition and response, transient ischemic attack (TIA) and 24-hour stroke risk, i aortic dissection and ruptured aneurysm.

Posterior circulation strokes and TIAs are notoriously missed by standard stroke screening tools like "FAST" (Face, Arm, Speech, Time), which focus on the anterior carotid circulation. Whenever a patient presents with acute dizziness, imbalance, or fainting, checking bilateral arm blood pressures and testing the "5 Ds of Posterior Circulation Ischemia" (Dizziness, Diplopia, Dysarthria, Dysphagia, and Dystaxia/Drop attacks) can save their brainstem and life.

Uradi ovo sada¶

1. Call your local emergency number immediately for any sudden vertigo paired with double vision, slurred speech, facial numbness, trouble swallowing, inability to walk, or fainting. Dial 911 in the United States and Canada, 112 across the European Union, 999 in the United Kingdom, 000 in Australia, or consult our directory of brojevi za hitne slučajeve. If the person developed a sharp, one-sided back-of-the-neck or base-of-the-skull headache after a chiropractic neck adjustment, massage gun use on the neck, sports collision, or heavy lifting, tell the dispatcher immediately: "Suspected Vertebral Artery Dissection and posterior circulation stroke within the thrombolysis window."
2. Immediately stop all exercise or overhead movement of the affected arm and lay the person down. In Subclavian Steal Syndrome, every muscle contraction of the affected arm (typically the left arm while painting, scrubbing, lifting, or cranking) lowers vascular resistance in the arm and siphons more blood backward out of the brainstem. Resting the arm at the person's side immediately stops the metabolic steal and restores forward basilar artery flow to the brain.
3. Measure blood pressure in BOTH arms and check both wrist (radial) pulses simultaneously. A systolic blood pressure difference of greater than 15 to 20 mmHg between the right and left arms, accompanied by a weak, delayed, or absent radial pulse and coolness in the lower-reading arm, is the hallmark bedside sign of proximal subclavian artery stenosis, Takayasu arteritis, or an acute Type A aortic dissection.
4. Keep the neck in a neutral, comfortable alignment and NEVER twist, stretch, massage, or manipulate a painful neck. If a vertebral or carotid artery dissection is present, a blood clot (intramural hematoma and intraluminal thrombus) is clinging precariously to the torn arterial wall inside the cervical spine. Rotating or cracking the neck again can shear off an embolus directly into the basilar artery, causing fatal locked-in syndrome or brainstem infarction.
5. Keep the patient strictly nil by mouth (nothing to eat, drink, or swallow, not even oral aspirin or water). Both vertebral artery dissection (Wallenberg lateral medullary stroke) and basilar ischemia paralyze the ninth and tenth cranial nerves (glossopharyngeal and vagus nerves) that control the gag and swallowing reflex (neurogenic dysphagia). Giving water or oral aspirin pills can cause immediate, life-threatening aspiration into the lungs.
6. Note the exact minute neurological symptoms started ("Last Known Well" time) and request a CT Angiogram (CTA) of the Head and Neck at the hospital. Plain non-contrast head CT scans miss more than 70 to 85 percent of early brainstem and cerebellar strokes due to skull base bone artifacts. You must specifically have a CT Angiogram (CTA) of the head and neck from the aortic arch to the vertex (or Diffusion-Weighted MRI + MRA) to visualize a vertebral artery dissection or subclavian occlusion.

Decision tree: triaging arm-exercise syncope, >20 mmHg inter-arm BP gap, and neck-pain vertigo¶

flowchart TD
    Start["Acute Vertigo, Syncope, Diplopia, Dysarthria, Ataxia, or Unilateral Arm Weakness / Claudication"] --> BPCheck["Immediate Bedside Check: Call 911 / 112 / 999, Rest Both Arms, Measure Blood Pressure in BOTH Right and Left Arms, Check Bilateral Radial Pulses"]

    BPCheck --> GapCheck{"Is There an Inter-Arm Systolic Blood Pressure Difference >= 15 to 20 mmHg?"}

    GapCheck -->|"YES: >= 15-20 mmHg Inter-Arm BP Gap + Delayed/Weak Radial Pulse"| ChestPainCheck{"Is There Sudden Tearing Chest/Back Pain OR Crushing Angina in a Patient With a Prior LIMA Heart Bypass?"}

    ChestPainCheck -->|"YES + Tearing Chest/Back Pain"| AorticDissection["Suspected Acute Type A Aortic Dissection Extending into Subclavian Artery: Immediate CT Aortogram, IV Beta-Blocker (Esmolol/Labetalol to HR < 60, SBP 100-120 in HIGHER Arm), Emergency Cardiothoracic Surgery"]

    ChestPainCheck -->|"YES + Angina During Left Arm Exercise in Prior CABG Patient"| CoronarySteal["Coronary-Subclavian Steal Syndrome (Retrograde Flow Up the LIMA Graft Away From LAD Coronary Artery): Stop Arm Exertion, Urgent Duplex & CTA, Endovascular Subclavian Angioplasty & Stenting"]

    ChestPainCheck -->|"NO Chest Pain: Arm Claudication + Vertigo/Syncope When Exercising One Arm"| SubclavianSteal["Classic Subclavian Steal Syndrome (Retrograde Vertebral Artery Flow): Duplex Ultrasound (Bunny Waveform -> Retrograde Flow) + CTA Arch, Endovascular Stenting or Carotid-Subclavian Bypass"]

    GapCheck -->|"NO (< 10-15 mmHg Gap): Normal Bilateral Pulses"| NeckPainCheck{"Is There Unilateral Posterior Neck / Occipital Pain, Recent Neck Manipulation/Trauma/Yoga, or Lateral Medullary Signs (Horner Syndrome, Hoarseness, Crossed Sensory Loss)?"}

    NeckPainCheck -->|"YES: High Suspicion for Vertebral Artery Dissection (VAD)"| VADProtocol["Suspected Vertebral Artery Dissection & Posterior Stroke (Wallenberg Syndrome): Neutral Neck, Strict NPO, Immediate CTA Head & Neck + Brain MRI/MRA, IV Thrombolysis (tPA/TNK if < 4.5h) Followed by Antiplatelet (Aspirin/DAPT) or Anticoagulation for 3-6 Months"]

    NeckPainCheck -->|"NO Neck Pain: Pure Acute Vestibular Syndrome"| HINTSCheck["Perform Bedside HINTS Exam (Head Impulse, Nystagmus, Test of Skew) + Gait Check to Rule Out Cerebellar / AICA / PICA Stroke vs. Vestibular Neuritis"]

Part 1: Subclavian Steal Syndrome (SSS) and Coronary-Subclavian Steal¶

Anatomical mechanism: how your left arm steals blood from your brainstem (and your heart)¶

Normally, oxygenated blood pumped out of the heart's aortic arch enters the left subclavian artery (and on the right side, the brachiocephalic [innominate] trunk dividing into the right common carotid and right subclavian arteries). Just a few centimeters after leaving the aortic arch, the subclavian artery gives off its first major upward branch: the Vertebral Artery, which travels up through the neck bones into the skull and joins its partner from the opposite side to form the Basilar Artery supplying the brainstem, cerebellum, and posterior brain.

What happens when a severe atherosclerotic plaque (or Takayasu arteritis in women under 40, thoracic outlet compression, or radiation fibrosis) blocks the proximal segment of the subclavian artery BEFORE the takeoff of the vertebral artery? 1. Why the Left Side is Affected 3 to 4 Times More Often (75% to 85% of cases): The left subclavian artery branches off the aortic arch at an acute, turbulent angle that strongly favors atherosclerotic plaque buildup at its ostium. 2. The Pressure Drop & Retrograde Siphon: Downstream of the proximal subclavian blockage, blood pressure inside the subclavian artery drops sharply (for example, to 90/60 mmHg in the left arm while the right arm reads 140/85 mmHg, a 50 mmHg inter-arm blood pressure gap). 3. Exercise-Induced Brainstem Steal: As long as the left arm is resting quietly, collateral vessels may keep the patient symptom-free (Subclavian Steal Phenomenon). However, the moment the patient exercises their left arm, such as reaching overhead to paint a ceiling, washing windows, lifting weights, or swimming, the exercising arm muscles release local vasodilators (adenosine, nitric oxide, lactate), dropping vascular resistance in the left arm. Blood follows the path of least resistance: blood flows UP the healthy right vertebral artery into the skull, turns a sharp U-turn at the vertebrobasilar junction, and rushes BACKWARD (retrograde) DOWN the left vertebral artery into the left arm, starving the brainstem and cerebellum of oxygen.

ANATOMY OF LEFT SUBCLAVIAN STEAL & CORONARY-SUBCLAVIAN STEAL SYNDROME

                 [ BASILAR ARTERY ] (Brainstem & Cerebellum Starved of Blood)
                      /      \
  Normal Upward      /        \   RETROGRADE "STEAL" FLOW (Blood sucked
  Forward Flow      /          \  DOWNWARD out of the brain into the left arm)
         |         /            \         |
         |        /              \        v
  [ Right Vertebral ]          [ Left Vertebral Artery ]
         |                                |
         |                                v
  [ Right Subclavian ]   [99% BLOCK]--[ Left Subclavian Artery ] ---> [ EXERCISING ]
         |               (Proximal)       |                           [  LEFT ARM  ]
         |                  |             |                           (Low Resistance
  =======+==================+=============|=======                     Siphon Sink)
  [               AORTIC ARCH             |      ]
                                          |  RETROGRADE CORONARY STEAL
                                          |  (In patients with a prior LIMA-to-LAD
                                          |   heart bypass, blood is sucked UP the
                                          +-- LIMA graft AWAY from the heart muscle)

The Deadly Variant: Coronary-Subclavian Steal Syndrome (CSSS) in Heart Bypass Patients¶

In cardiac surgery, the gold-standard conduit used to bypass a blocked Left Anterior Descending (LAD) coronary artery ("the widowmaker") is the Left Internal Mammary Artery (LIMA), which is left attached to its natural origin on the underside of the left subclavian artery just distal to the vertebral artery. - Ako pacijent koji je ranije imao LIMA-to-LAD premosnicu koronarne arterije (CABG) razvije ozbiljnu blokadu u svojoj proksimalnoj lijevoj subklavijalnoj arteriji, vježbanjem lijeve ruke usisava krv nazad GORE LIMA bajpas transplantata dalje od prednjeg zida srca koje kuca u lijevu ruku. - Klinički potpis koronarno-subklavijske krađe: Kad god pacijent koristi lijevu ruku, razvija razbijajuću anginu bol u grudima, kratak dah, elevaciju/depresiju ST segmenta, ventrikularne aritmije ili srčani udar. Zbog toga kardiolozi moraju uvijek izmjeriti krvni tlak u OBJE ruke prije izvođenja CABG operacije i kod bilo kojeg premosnog pacijenta koji ima ponavljajuće bolove u grudima.

The 3 Grades of Subclavian Steal on Duplex Doppler Ultrasound (and the Hyperemia Cuff Test)¶

On color-flow Duplex Doppler ultrasound of the neck, vascular specialists classify subclavian steal into 3 hemodynamic grades based on the vertebral artery waveform: - Grade 1 (Pre-Steal / Occult Steal - "Bunny Waveform"): Antegrade (forward) flow continues throughout the cardiac cycle, but there is a sharp mid-systolic velocity deceleration notch giving the Doppler tracing the unmistakable silhouette of a crouching rabbit (the "bunny rabbit" waveform). - Ocena 2 (djelimična / povremena / naizmjenična krađa): Dvosmjerni tok: krv teče nazad (retrogradno) niz vertebralnu arteriju tokom vršne sistole (kada pritisak u ruci opadne u odnosu na mozak) i teče naprijed (antegradno) tokom dijastole. - Grade 3 (Complete / Permanent Steal): Continuous 100% retrograde (backward) flow down the vertebral artery throughout the entire cardiac cycle. - The Reactive Hyperemia Provocation Cuff Test: In patients with Grade 1 or Grade 2 steal, the sonographer inflates a blood pressure cuff on the affected arm to 20 mmHg above systolic pressure for 3 to 5 minutes while the patient squeezes a ball, then rapidly deflates the cuff. The sudden reactive vasodilation in the arm immediately converts a Grade 1 "bunny waveform" into frank Grade 3 retrograde flow.

Definitive treatment of Symptomatic Subclavian Steal Syndrome¶

• Asymptomatic Subclavian Steal Phenomenon (incidental retrograde flow on ultrasound or a BP gap without arm claudication, vertebrobasilar TIA/syncope, or coronary steal): Treated conservatively with optimal medical therapy (Aspirin 75-100 mg daily, high-intensity statin such as atorvastatin 40-80 mg or rosuvastatin 20-40 mg, smoking cessation, and measuring blood pressure strictly in the unaffected higher-reading arm so hypertension is not missed or undertreated).
• Symptomatic Subclavian Steal Syndrome or Coronary-Subclavian Steal: Requires revascularization:
• First-Line Endovascular Percutaneous Transluminal Angioplasty (PTA) and Balloon-Expandable Stenting of the proximal subclavian artery (technical success > 95%, minimal downtime).
• Extra-Anatomic Surgical Bypass (Carotid-to-Subclavian Bypass using a prosthetic PTFE/Dacron graft, Subclavian-to-Carotid Transposition, or Axillo-Axillary Bypass) for long-segment chronic total occlusions that cannot be crossed endovascularly.

Part 2: Vertebral Artery Dissection (VAD) and Wallenberg Lateral Medullary Stroke¶

While Subclavian Steal typically affects older adults (age > 55) with atherosclerosis, Vertebral Artery Dissection (VAD) (along with internal carotid dissection) accounts for only 2 percent of all ischemic strokes overall, yet causes 15 to 25 percent of all strokes in young and middle-aged adults under age 45.

Why the V3 Segment at C1-C2 tears during neck manipulation, sports, or minor trauma¶

The vertebral artery is divided into 4 anatomical segments (V1 to V4): - V1 (Preforaminal): Origin from the subclavian artery to the C6 transverse foramen. - V2 (Foraminal): Ascends straight up through the bony holes (transverse foramina) of the C6 through C2 cervical vertebrae. - V3 (Extradural / Atlantoaxial Loop - THE DANGER ZONE): Exits the C2 bone, makes a sharp 90-degree horizontal loop and another vertical bend around the C1 (atlas) vertebra, and pierces the dura mater at the foramen magnum. Because 50 percent of all human head rotation (turning your chin left or right) occurs at the C1-C2 atlantoaxial joint, the V3 segment is subjected to intense stretching and shearing forces during rotation and hyperextension. - V4 (Intradural / Intracranial): Enters the skull, gives off the Posterior Inferior Cerebellar Artery (PICA), and unites with the opposite vertebral artery to form the Basilar Artery.

Common triggers and underlying connective tissue vulnerabilities¶

1. Mechanical Neck Triggers (Often Surprisingly Minor):
2. High-Velocity Cervical Spine Manipulation (Chiropractic / Osteopathic Neck Thrusts): The American Heart Association / American Stroke Association (AHA/ASA) Scientific Statement highlights a strong epidemiological association between cervical manipulative therapy and V3 segment vertebral artery dissection in young adults.
3. Sports, Exercise & Daily Activities: Whiplash car crashes, golf swings, tennis serves, swimming, heavy overhead weightlifting, yoga headstands/hyperextension ("beauty parlor stroke syndrome" when leaning the neck backward into a salon hair-washing sink), roller coasters, or using a percussive massage gun on the neck.
4. Violent Coughing, Sneezing, Vomiting, or Childbirth Pushing.
5. Underlying Arteriopathies (Present in 15% to 50% of "Spontaneous" Dissections):
6. Fibromuscular Dysplasia (FMD) ("string-of-beads" appearance of the renal and cervical arteries; present in 15% to 20% of spontaneous cervical artery dissections), Vascular Ehlers-Danlos Syndrome (Type IV - COL3A1), Marfan Syndrome, Loeys-Dietz Syndrome, and Osteogenesis Imperfecta.

How Vertebral Artery Dissection causes Stroke: Wallenberg Lateral Medullary Syndrome¶

When the inner lining (intima) of the vertebral artery tears, high-pressure arterial blood burrows into the muscular wall, creating a false lumen / intramural hematoma. This triggers stroke through two mechanisms: 1. Artery-to-Artery Thromboembolism (85% of cases): Blood clotting factors contact the exposed subendothelial collagen at the tear site, forming a clot that breaks off and plugs the Posterior Inferior Cerebellar Artery (PICA), the distal vertebral artery, or the Basilar Artery. 2. Hemodynamic Lumen Occlusion (15% of cases) or Intracranial Subarachnoid Hemorrhage (if the thin-walled V4 intracranial segment ruptures).

The Classic Clinical Picture of Wallenberg Syndrome (Lateral Medullary Infarction)¶

First, 70 to 80 percent of patients develop sudden unilateral posterior neck pain and throbbing occipital (back-of-head) headache, which is often mistaken for a pulled neck muscle or migraine for hours to several days (median 1 to 4 days, up to 2 weeks) before the stroke hits. When the clot occludes the ipsilateral vertebral artery or PICA, it infarcts the lateral wedge of the medulla oblongata and inferior cerebellum, producing the unmistakable Wallenberg Syndrome:

WALLENBERG LATERAL MEDULLARY SYNDROME (THE "CROSSED" BRAINSTEM STROKE)

  [ IPSILATERAL SIGNS (Same Side as the Torn Vertebral Artery & Neck Pain) ]
    * HORNER SYNDROME (Sympathetic tract): Drooping eyelid (Ptosis), Constricted
      pupil (Miosis), and Loss of facial sweating (Anhidrosis) on the SAME side.
    * FACIAL LOSS OF PAIN & TEMPERATURE (Spinal Trigeminal Nucleus CN V):
      Numbness to pinprick and heat/cold on the SAME side of the face.
    * ATAXIA & FALLING TO THE SAME SIDE (Inferior Cerebellar Peduncle / Cerebellum):
      Violent spinning Vertigo, Nystagmus, Nausea/Vomiting, and falling toward the lesion.
    * BULBAR PALSY (Nucleus Ambiguus CN IX & X): Hoarse voice (vocal cord paralysis),
      Loss of gag reflex, severe Dysphagia (cannot swallow), and intractable Hiccups.

  [ CONTRALATERAL SIGNS (Opposite Side of the Body Below the Neck) ]
    * CONTRALATERAL BODY LOSS OF PAIN & TEMPERATURE (Spinothalamic Tract):
      Cannot feel hot water or pinprick on the arm, trunk, and leg on the OPPOSITE side.
    *(Note: Motor strength in the arms and legs is often SPARED unless the stroke
      extends forward into the medial medulla or basilar artery)*

Comprehensive comparison table: Subclavian Steal vs. Vertebral Artery Dissection vs. Benign Vertigo (BPPV / Vestibular Neuritis)¶

Bolničko liječenje disekcije vertebralne arterije: tromboliza, ispitivanje CADISS (antitrombocitna vs. antikoagulacija) i oprez pri rupturi V4¶

1. Akutna reperfuziona terapija (unutar 4,5 do 24 sata od početka moždanog udara):
2. Intravenska tromboliza (Alteplase [tPA] ili Tenecteplase [TNK]): Prema Smjernicama za akutni ishemijski moždani udar AHA/ASA, ekstrakranijalna disekcija cervikalne ili vertebralne arterije je SIGURNA i PREPORUČUJE SE za intravensku trombolizu u roku od 4,5 sata (providno se ne postavlja u roku od 4,5 sata) subarahnoidno krvarenje na početnom CT glave).
3. Mehanička trombektomija: Ako se tromb iz disekcije vertebralne arterije embolizira u Bazilarnu arteriju i začepi je (najsmrtonosniji moždani udar u medicini, sa > 80% smrtnost ako se ne liječi, što uzrokuje kvadriplegiju i sindrom zaključavanja), hitna endovaskularna mehanička trombektomija se izvodi do 24 sata od početka.
4. Sprečavanje ponavljanja moždanog udara: antitrombocitna terapija naspram antikoagulacije (ispitivanja CADISS i TREAT-CAD):
5. Jednom kada se isključi akutna krvarenja, pacijentima sa ekstrakranijalnom (V1, V2 ili V3 segment) disekcijom vertebralne arterije potrebno je 3 do 6 mjeseci antitrombotičke terapije kako bi se spriječilo emboliranje ugrušaka iz sirove suze intime dok se arterija sama zacijeli.
6. Značajna randomizirana klinička ispitivanja (CADISS i TREAT-CAD) dokazala su da i Antiplatelet terapija (kao što je Dvojna antiagregirana terapija [Aspirin + Klopidogrel] u trajanju od 21 do 90 dana praćena pojedinačnim antitrombocitnim ili aspirinskim monoterapijom) i Thecoafaringuulation direktni oralni antikoagulant) imaju niske i statistički uporedive stope rekurentnog moždanog udara (otprilike 1% do 2%).
7. KRITIČNI IZUZETAK ZA V4 INTRAKRANIJALNU DISEKCIJU: Za razliku od V1-V3 segmenata vrata, V4 intrakranijalni segment vertebralne arterije unutar lubanje ima medij i adventiciju tanku kao papir i nema vanjsku elastičnu laminu. Stoga, V4 intrakranijalne disekcije nose visok rizik od rupture kroz vanjski zid i izazivaju fatalno Subarahnoidalno krvarenje (SAH). Prije nego što započnu primjenu razrjeđivača krvi u V4 intrakranijalnoj disekciji, doktori izvode CT angiogram (i lumbalnu punkciju ako je potrebno) kako bi isključili secirajuću pseudoaneurizmu ili subarahnoidalno krvarenje; rupturirane intrakranijalne V4 disekcije zahtijevaju hitno endovaskularno stentiranje sa diverterom protoka ili hvatanje spiralom.
8. Vremenska linija iscjeljenja i ograničenja aktivnosti (3 do 6 mjeseci):
9. Preko 70 do 85 posto stenotičnih disekcija vertebralnih arterija spontano se rekanalizira i zacijeli svoj unutrašnji zid u roku od 3 do 6 mjeseci (potvrđeno ponovljenim CTA ili MRA nakon 3 do 6 mjeseci).
10. Tokom izlječenja, pacijenti moraju trajno izbjegavati kiropraktične manipulacije vratom i izbjegavati dizanje teških tegova, kontaktne sportove, rolerkostere i ekstremnu hiperekstenziju vrata.

Regional emergency numbers and stroke protocols¶

• Sjedinjene Američke Države i Kanada: Pozovite 911. Upravlja se prema smjernicama American Heart Association/American Stroke Association (AHA/ASA) za rano liječenje pacijenata sa akutnim ishemijskim moždanim udarom i AHA/ASA naučne izjave o disekcijama cervikalnih arterija.
• Evropska unija i Ujedinjeno Kraljevstvo: Birajte 112 širom Evrope ili 999 u UK. Upravlja se prema Smjernicama Evropske organizacije za moždani udar (ESO) za zbrinjavanje ekstrakranijalne i intrakranijalne disekcije arterija i ESC smjernicama o dijagnostici i liječenju bolesti perifernih arterija (bolesti subklavijskih arterija).
• Australija i Novi Zeland: Birajte 000 u Australiji ili 111 na Novom Zelandu. Upravlja se prema Kliničkim smjernicama za liječenje moždanog udara Fondacije za moždani udar.

Često postavljana pitanja¶

Kako mi vježbanje lijeve ruke može izazvati vrtoglavicu ili nesvjesticu u sindromu subklavijske krađe?¶

Kada se glavna arterija koja hrani vašu lijevu ruku (proksimalna lijeva subklavijska arterija) jako suzi PRIJE tačke grananja lijeve vertebralne arterije koja ide do vašeg mozga, pritisak u arteriji lijeve ruke opada. Čim vježbate lijevu ruku, kao što je podizanje, trljanje ili posezanje iznad glave, mišići vaših ruku zahtijevaju dodatnu krv i proširuju svoje žile, stvarajući vakuum niskog pritiska koji bukvalno usisava krv unatrag niz vašu lijevu vertebralnu arteriju iz vašeg moždanog stabla i malog mozga kako bi nahranio ruku, uzrokujući iznenadnu vrtoglavicu ili dvostruko mirovanje.

Šta znači razlika u krvnom pritisku veća od 20 mmHg između moje desne i lijeve ruke?¶

Normalno, gornji (sistolički) broj krvnog pritiska između vaše desne i lijeve ruke razlikuje se za manje od 10 mmHg. Perzistentna razlika u sistolnom krvnom tlaku od 15 do 20 mmHg ili više ukazuje na značajno sužavanje ili blokadu u subklavijskoj ili inominiranoj arteriji koja opskrbljuje ruku donjeg čitanja (najčešće aterosklerotični sindrom subklavijske krađe ili Takayasu arteritis kod mladih žena). Ako se razlika krvnog pritiska između ruku >20 mmHg iznenada pojavi uz jake bolove u grudima ili leđima, to je znak akutne disekcije aorte tipa A.

Zašto kiropraktička korekcija vrata ili teški trzajni trzaj mogu uzrokovati moždani udar kod mlade odrasle osobe?¶

Vertebralne arterije putuju gore kroz male rupe u vratnim kostima i moraju napraviti oštru petlju od 90 stepeni između gornja dva vratna pršljena (C2 i C1) gdje se događa 50 posto rotacije glave. Rotacijski potisak u vratu velike brzine, trzajni udar ili ekstremna hiperekstenzija mogu istegnuti i pokidati unutrašnju oblogu arterije (disekcija vertebralne arterije). Krvni ugrušci se formiraju na suzi i odvajaju se u moždano deblo i mali mozak, uzrokujući Wallenbergov lateralni medularni udar, često satima do danima nakon prvog upozoravajućeg znaka jednostranog bola u stražnjem dijelu vrata i u dnu lubanje.

Šta je koronarno-subklavijski sindrom krađe kod nekoga ko je imao operaciju srčane premosnice?¶

Tokom operacije srčane premosnice (CABG), hirurzi obično koriste lijevu unutrašnju mliječnu arteriju (LIMA), koja se grana od lijeve subklavijalne arterije, kako bi dovela oksigenisanu krv u prednji dio srca. Ako se kasnije razvije suženje na početku lijeve subklavijske arterije, vježbanje lijeve ruke krade krv unatrag prema LIMA bajpas transplantatu dalje od srčanog mišića koji kuca, izazivajući užasnu anginu bol u grudima ili srčani udar svaki put kada osoba koristi lijevu ruku.

Izvori i službene upute¶

• Američka asocijacija za srce / Američko udruženje za moždani udar (AHA/ASA, Sjedinjene Države): Naučna izjava za zdravstvene radnike: Disekcije cervikalne arterije i povezanost s cervikalnom manipulativnom terapijom (Biller J et al., Moždani udar) i Smjernice za rano liječenje pacijenata s ishemijskim moždanim udarom.
• Evropska organizacija za moždani udar (ESO, Evropa): ESO smjernica za upravljanje disekcijom ekstrakranijalne i intrakranijalne arterije (Debette S, Markus HS, et al., European Stroke Journal, 2021).
• Probni istraživači za disekciju cervikalne arterije u studiji moždanog udara (CADISS) (The Lancet Neurology, 2015. & JAMA Neurology, 2019.): Antitrombocitna terapija u odnosu na antikoagulacionu terapiju u disekciji cervikalne arterije.
• Evropsko kardiološko društvo (ESC) i Društvo za vaskularnu hirurgiju (SVS): Smernice za dijagnostiku i lečenje bolesti perifernih arterija: Stenoza gornjih ekstremiteta i subklavijske arterije / Sindrom subklavijske krađe.

Povezani vodiči¶

• Prepoznavanje moždanog udara, FAST test i trenutni odgovor
• Rizik od prolaznog ishemijskog napada (TIA) i 24-satnog moždanog udara
• Disekcija aorte i rupturirana aneurizma abdominalne aorte
• Sinkopa sa kardiogenim crvenim zastavicama i nesvjestica pri vježbanju
• Ozljede kičmene moždine i sigurna imobilizacija vrata