GCC Nursing Guide — Aortic Dissection & Aortic Emergencies

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Aortic dissection carries a mortality of ~1–2% per hour untreated in Type A. Early recognition and immediate escalation is the single most important nursing action. Do not delay imaging for a definitive diagnosis when clinical suspicion is high.

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Definition & Mechanism

Aortic dissection is a tear in the aortic intima that allows blood to enter the media layer, creating a false lumen running parallel to the true lumen. The false lumen can propagate proximally (toward the heart) or distally.

Consequences of False Lumen

Compression of true lumen → malperfusion of branch vessels
Propagation to aortic root → aortic regurgitation, coronary occlusion (MI), pericardial tamponade
Rupture into pleural/pericardial space → haemodynamic collapse
False lumen expansion → aneurysm formation

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Stanford Classification

Feature	Type A	Type B
Aortic involvement	Ascending aorta ± arch	Descending aorta only
Management	SURGICAL EMERGENCY	Medical (unless complicated)
Mortality (untreated)	~1–2%/hr (first 48h)	~10–25% in-hospital
Risk of tamponade	High	Low
Risk of AR murmur	Yes	No
Complications	Stroke, MI, tamponade, AR	Renal, mesenteric, limb

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DeBakey Classification

DeBakey Type I

Originates in ascending aorta, propagates through arch and into descending aorta. Most extensive — highest mortality. Corresponds to Stanford A.

DeBakey Type II

Limited to ascending aorta only. Also Stanford A. Common in Marfan syndrome. Surgical repair confined to ascending segment.

DeBakey Type III

Originates in descending aorta distal to left subclavian artery. Stanford B. Further divided into IIIa (limited) and IIIb (extends to abdomen).

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Classic Presentation

⚠️

Hallmark: sudden onset tearing or ripping chest pain, maximum severity at the moment of onset — different from ACS (which builds gradually). Radiates to the back/interscapular region.

Severe chest pain + back pain — abrupt onset
"Tearing," "ripping," "knife-like," "stabbing through" descriptions
Pain may migrate as dissection propagates distally
Associated diaphoresis, anxiety, pallor
Hypertension (most common) or hypotension (rupture/tamponade — bad sign)

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Atypical Presentations

Up to 20–40% of dissections present atypically — the "great masquerader." Missed diagnosis is common.

Neurological: stroke (carotid/innominate involvement), paraplegia (spinal arteries)
MI mimic: right coronary ostium involvement → inferior STEMI pattern
Syncope: cardiac tamponade or severe pain vasovagal response
Limb ischaemia: acute cold pulseless limb (iliac/subclavian compromise)
Abdominal pain: mesenteric ischaemia, renal infarction
Hoarseness: compression of recurrent laryngeal nerve

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Risk Factors

Hypertensive / Acquired

Connective Tissue / Genetic

GCC-Specific Context

Hypertension prevalence in Gulf states is among the highest globally (30–40% in adults), and hypertension control rates remain suboptimal. Younger Marfan patients presenting to GCC hospitals may have had limited prior cardiovascular screening. Cocaine use, while culturally less prevalent, does occur.

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Key Examination Signs

Vascular Signs

Pulse deficitAbsent/reduced pulse in one limb vs other

BP differential>20 mmHg SBP difference between arms

Aortic regurgitation murmurEarly diastolic — Type A involvement of root

JVP elevationTamponade or severe AR — right heart backpressure

Muffled heart soundsPericardial effusion / tamponade

Neurological Signs

Neurological signs occur in 17–40% of Type A dissections. They arise from carotid, vertebral, or spinal artery involvement.

Hemiplegia, facial droop — carotid involvement
Visual disturbances, dysphasia — cerebral ischaemia
Paraplegia / lower limb weakness — spinal artery
Altered GCS — tamponade, shock, or direct cerebral

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Caution: Thrombolytics must NOT be given if dissection is a differential for stroke — fatal haemorrhage risk.

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Immediate Nursing Priorities — ABCDE

A — Airway: Assess patency. If altered GCS or haemodynamic collapse, prepare for intubation support.
B — Breathing: Supplemental O₂ if SpO₂ <94%. Pleural effusion (haemothorax) may compromise breathing — monitor RR, SpO₂.
C — Circulation: Two large-bore IV cannulae (14–16G) immediately. Continuous cardiac monitoring (ECG). BP both arms. Early arterial line.
D — Disability: GCS, pupils, limb neurology baseline — document fully before any intervention.
E — Exposure: Full exposure — check all limb pulses, skin perfusion, back for bruising/haematoma.
Escalate IMMEDIATELY: Activate senior clinician. If Type A suspected — call cardiac surgery team and book emergency theatre.

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Avoid antihypertensives until imaging confirms dissection — hypotension in apparent hypertensive patient may represent dissection with tamponade. Treat the patient, not the number alone.

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Blood Pressure Assessment

Bilateral Arm BPs — Mandatory

Measure BP in both arms simultaneously (or sequentially, document both). A difference of >20 mmHg SBP indicates subclavian or innominate artery involvement and supports dissection diagnosis.

Right arm SBPRecord and document

Left arm SBPRecord and document

Differential >20 mmHgClinically significant — report immediately

Leg BP if limb ischaemiaABI assessment — iliac involvement

Arterial line insertion (radial — right arm preferred for Type A surgical planning) allows continuous BP monitoring. Prepare for arterial line: Allen's test, sterile field, transducer setup.

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12-Lead ECG

Purpose in Aortic Dissection

ECG is performed urgently to exclude STEMI — the critical differential. The management of STEMI (thrombolytics, primary PCI) would be catastrophic in aortic dissection.

Normal ECGMost common in aortic dissection — does NOT exclude it

ST elevation (inferior)May be RCA ostium involvement — NOT true STEMI

Sinus tachycardiaPain response or shock state

Electrical alternansTamponade — QRS alternating height

Pericarditis patternSaddle ST changes — haemopericardium

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NEVER give thrombolytics for an inferior STEMI pattern without considering aortic dissection. History of tearing back pain + STEMI = dissection until proven otherwise.

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Chest X-Ray Findings

Widened Mediastinum

Most common CXR finding. Mediastinal width >8 cm on PA film — or mediastinum >25% of thoracic width. Sensitivity ~60–90% — normal CXR does NOT exclude dissection.

Other CXR Signs

Abnormal aortic knuckle / knob
Loss of aortopulmonary window
Left pleural effusion (haemothorax)
Deviation of trachea to right
Calcium sign: intimal calcification displaced >6mm inward

Nursing Role

Arrange portable CXR or accompany patient to radiology (ensure monitoring throughout). Do NOT send unstable patient unescorted. Document findings and report to senior immediately. CXR is a screening tool only — CTA is required for diagnosis.

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CT Angiography (CTA) — Gold Standard

Why CTA?

CTA chest/abdomen/pelvis with contrast is the gold standard for aortic dissection — sensitivity and specificity >98%. Identifies entry tear, extent, branch vessel involvement, and pericardial effusion.

Nursing Preparation for CTA

Confirm allergy history — contrast media allergy protocol
IV access — 18G minimum for power injector (antecubital preferred)
Check renal function (eGFR) — contrast nephropathy risk
Metformin: withhold for 48h post-contrast if eGFR borderline
Continuous monitoring during transfer and scan — resus equipment ready
Patient must be haemodynamically stable enough to go to CT — discuss with senior
Complete briefing form, document time of contrast injection

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Blood Tests

TroponinRule out ACS — may be mildly elevated in dissection (coronary involvement)

FBCBaseline Hb, haematocrit — pre-op/bleeding assessment

Coagulation (PT/APTT)Pre-operatively for Type A — cardiopulmonary bypass prep

Cross-matchType A: request 10 units RBC + FFP + platelets urgently

U&E / CreatinineRenal artery involvement — baseline and trend

LFTsMesenteric involvement — elevated transaminases

LactateMalperfusion indicator — elevated = poor perfusion to viscera/limbs

D-dimerHigh sensitivity, low specificity — useful to EXCLUDE if low pre-test probability

Label all blood tubes clearly, mark urgent/stat. Call the laboratory to pre-warn for cross-match volume in Type A.

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Pain Management

Why Pain Control Matters

Pain stimulates sympathetic nervous system → tachycardia and hypertension → increased aortic wall shear stress → accelerates dissection propagation. Adequate analgesia is a haemodynamic intervention, not just comfort care.

IV Morphine Titration

Morphine 2–4 mg IV boluses every 5–10 minutes
Titrate to pain VAS score <4/10
Monitor respiratory rate, SpO₂, GCS
Anti-emetic (ondansetron 4 mg IV) concurrently
Document VAS score before and after each dose

What to Avoid

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Avoid NSAIDs (ibuprofen, diclofenac) — platelet inhibition, renal impairment, potential for increased bleeding in surgical patients.

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Avoid IM injections in potential surgical candidates — IM morphine not suitable; IV titration gives better control and avoids haematoma in anticoagulated patients.

TOE (Transoesophageal Echo)

Used in ICU/theatre for unstable patients too unwell for CT. Nursing role: sedation preparation, monitoring, documentation of findings by anaesthetist/cardiologist.

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Type B (uncomplicated) aortic dissection: Primary goal is haemodynamic control — reduce aortic wall stress by lowering heart rate and blood pressure. Surgical/endovascular intervention reserved for complicated Type B (malperfusion, rupture, uncontrolled pain, rapid expansion).

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BP & HR Targets

SBP target100–120 mmHg

HR target<60 bpm

RationaleReduce aortic wall stress (dP/dt) to prevent propagation and rupture

MonitoringContinuous arterial line — beat-to-beat BP

Urine output target>0.5 mL/kg/hr — ensure no renal malperfusion

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Balance: Excessive BP reduction risks visceral and limb ischaemia if malperfusion present. Hourly end-organ assessment is essential alongside BP control.

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IV Beta-Blockers — First Line

Why Beta-Blockers FIRST?

Beta-blockers reduce HR and BP simultaneously, and critically reduce the rate of rise of aortic pressure (dP/dt) — the main driver of dissection propagation. Must be given before vasodilators to prevent reflex tachycardia.

Labetalol (Combined Alpha + Beta) ▼

Dose: 20 mg IV slow bolus over 2 min. Repeat 40–80 mg every 10 min. Max 300 mg total. Then infusion: 1–2 mg/min.

Advantage: Combined alpha/beta blockade — reduces both HR and vasodilates. Ideal single agent for aortic dissection.

Monitor: HR (target <60), SBP (target 100–120), signs of bronchospasm, acute heart failure.

Contraindications: Severe asthma, 2nd/3rd degree heart block, decompensated cardiac failure, severe bradycardia.

Esmolol (Short-Acting Beta-1 Selective) ▼

Dose: Loading 500 mcg/kg IV over 1 min, then infusion 50–200 mcg/kg/min. Titrate to HR/BP.

Advantage: Very short half-life (9 min) — easily titratable, reversible rapidly if adverse effect. Preferred in labile patients or when effects need close control.

Nursing note: Use central line or large-bore IV for infusion. Monitor for hypotension, bradycardia, bronchospasm.

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Vasodilator Therapy — After HR Control

Principle

If BP remains elevated after beta-blockade, add a vasodilator. NEVER start vasodilator alone — reflex tachycardia increases aortic shear stress and can worsen dissection.

IV Nicardipine (Calcium Channel Blocker)

Infusion 5–15 mg/hr. Titratable. Good choice if beta-blocker contraindicated (asthma, severe bradycardia). Less reflex tachycardia than nitrates.

IV Glyceryl Trinitrate (GTN)

Useful if cardiac ischaemia co-exists. Titrate 0.5–10 mcg/kg/min. Monitor for headache, hypotension.

Drugs to Avoid

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Sodium Nitroprusside alone: Potent vasodilator that causes profound reflex tachycardia, increasing dP/dt and aortic shear stress. If used at all, must be combined with adequate beta-blockade. Generally avoided as first-line agent.

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Dihydropyridine CCBs alone (e.g., nifedipine oral): Reflex tachycardia risk. Not preferred in acute phase.

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Urine Output Monitoring

Hourly urinary catheter measurement is mandatory in aortic dissection medical management. The renal arteries arise from the aorta and are at risk of malperfusion from false lumen compression.

Target UO>0.5 mL/kg/hr

Oliguria (<0.5 mL/kg/hr)Report — renal malperfusion or hypovolaemia

AnuriaEmergency — renal artery occlusion suspected

HaematuriaRenal infarction — urgent imaging review

Avoid fluid overload — do not give large IV fluid boluses for oliguria without considering malperfusion mechanism vs true hypovolaemia. Discuss with senior.

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Limb Perfusion Monitoring

Hourly Neurovascular Checks — All 4 Limbs

Pulse: Radial, femoral, popliteal, posterior tibial, dorsalis pedis — document presence/absence and quality
Temperature: Warm vs cold — compare bilaterally
Capillary refill: <2 seconds = normal
Colour: Pallor, mottling, cyanosis
Pain/paraesthesia: Ischaemic pain or loss of sensation
Movement: Limb weakness or paralysis

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Any new pulse deficit, limb pallor, or neurological deficit = escalate IMMEDIATELY — may indicate complicated Type B requiring endovascular intervention.

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Serial CT Surveillance

Purpose

Serial CTA monitors false lumen growth, aortic diameter, and development of complications. Uncomplicated Type B: CTA at 24–48h, then 1 month, 6 months, annually if stable.

Nursing Preparation (Repeat CTA)

Confirm allergy and renal function pre-contrast
Continuous monitoring during transfer
Ensure IV access patent (flush before injector)
Document baseline vital signs and limb neurology before leaving ward

Indication for Intervention

Aortic diameter >55 mm, growth >5 mm in 6 months, or development of malperfusion — consider TEVAR (Thoracic Endovascular Aortic Repair) conversion. Nursing role: pre-procedure preparation as for planned endovascular procedure.

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Type A Aortic Dissection = Surgical Emergency. Door-to-theatre goal is <4 hours (ideally <2 hours from diagnosis). Every minute of delay increases mortality. All nursing preparation must happen in parallel — not sequentially.

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Pre-Operative Nursing Preparation — Type A

Informed consent — witnessed by nurse; anaesthetist/surgeon to obtain. Note mental capacity if neurological deficit.
Urgent cross-match: 10 units packed RBC + 10 units FFP + 2 pools platelets. Label and rush to blood bank.
Urinary catheter insertion — hourly measurement initiated.
Nasogastric tube — indicated if procedure prolonged, bowel preparation as per surgical team.
Arterial line (right radial preferred) — continuous beat-to-beat BP monitoring.
Central venous line (if not already) — for vasopressors, CVP monitoring.
ECG, transthoracic ECHO (bedside) — if time permits for surgical planning.

Shaving/skin preparation as per theatre protocol — chest, groin (for potential femoral cannulation).
Remove jewellery, nail varnish, hearing aids.
Antibiotic prophylaxis as per surgical protocol (cefazolin or vancomycin if MRSA risk).
Documentation: ensure all investigation results printed and attached to notes for theatre team.
Contact next-of-kin — chaplain/social worker activation if appropriate.
Handover to theatre team: SBAR format — diagnosis, classification, investigations, blood products status, line access.

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Intraoperative Overview (Nurse Awareness)

Cardiopulmonary Bypass (CPB)

Patient placed on bypass — heart and lungs taken over by bypass circuit. Allows bloodless operating field. The cannulation strategy (femoral vs direct aortic) depends on dissection anatomy.

Hypothermic Circulatory Arrest (HCA)

Core temperature cooled to 18–28°C. Circulation stopped (arrest) for 15–45 minutes to allow repair of aortic arch without blood in field. Brain protection achieved via hypothermia ± cerebral perfusion.

Surgical Repair

Excision of intimal tear, resection of ascending aorta, replacement with Dacron graft. Bentall procedure if root involved (graft + valve + reimplant coronaries). Arch repair if arch involved.

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Post-op ICU Nursing — Haemodynamics

ICU Admission Bundle

Continuous arterial line BP — document SBP target (90–120 mmHg)
Central venous pressure monitoring — target 8–12 cmH₂O
Cardiac output monitoring if available (Swan-Ganz or PiCCO)
Temperature management — gradual re-warming post-HCA over 4–6h
Vasopressors (noradrenaline) if hypotensive post-CPB — titrate to MAP >65
Vasodilators (GTN/nicardipine) if hypertensive — aim SBP 90–120
Blood glucose control — 6–10 mmol/L (post-bypass hyperglycaemia common)
Chest drain output: document hourly — significant if >200 mL/hr

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Post-CPB coagulopathy is common. Monitor chest drain output closely. Re-operation for bleeding occurs in ~10% of cases. Prepare FFP, platelets, cryoprecipitate at bedside.

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Neurological Complications Post-op

Stroke Risk

Stroke occurs in 5–15% post-Type A repair — from embolism during CPB, HCA period, or carotid/innominate involvement. Neurological baseline documentation is critical before surgery to compare post-op.

Hourly Neuro Observations

GCS (eye, verbal, motor) — document and compare to pre-op baseline
Pupil size and reaction (bilaterally)
Facial symmetry — facial droop, asymmetry
Limb power (arms and legs) — grip strength, foot plantar/dorsiflexion
Speech assessment when conscious — dysphasia, dysarthria

Delayed Awakening

Expected post-HCA. Concern if >6 hours without improvement or focal deficit emerges. Neuroimaging and neurologist review. Maintain normoglycaemia and normothermia — secondary brain injury prevention.

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Renal Complications Post-op

Post-op AKI

AKI affects up to 30–40% of Type A post-op patients — caused by hypoperfusion during bypass, renal artery involvement, and contrast load. Risk of needing Renal Replacement Therapy (RRT).

Nursing Management

Hourly urine output — alert if <0.5 mL/kg/hr for 2 consecutive hours
Daily U&E and creatinine — trend is important
Avoid nephrotoxic drugs — NSAIDs, aminoglycosides, contrast if possible
Fluid balance optimisation — avoid both hypovolaemia and overload
Prepare RRT access (vascath) if oliguria persists beyond 12h
Document and report rising potassium (>5.5 mmol/L) — RRT indication

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TEVAR — Endovascular Repair (Type B)

What is TEVAR?

Thoracic Endovascular Aortic Repair — a covered stent-graft deployed via the femoral artery to seal the intimal tear and redirect blood into the true lumen. Used for complicated Type B: malperfusion, rapid expansion, rupture.

Post-TEVAR Nursing

Femoral access site: haematoma assessment, wound check 2-hourly
Limb perfusion: bilateral leg neurovascular observations hourly
Spinal cord ischaemia: lower limb motor and sensory assessment — risk of paraplegia (anterior spinal artery)
Renal function monitoring post-contrast load
BP control maintained: SBP 100–120 mmHg, HR <60
Drain management if hybrid procedure

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Malperfusion Syndromes — Overview

Malperfusion occurs when the false lumen compresses or occludes branch vessel origins. Can affect any territory. Malperfusion can coexist with or develop independently of haemodynamic instability.

Territory	Vessel Affected	Nursing Signs to Monitor	Urgency
Coronary	RCA ostium (mostly)	ST changes, chest pain, haemodynamic instability	Critical
Cerebral	Carotid / innominate	Focal neuro deficit, altered GCS, facial asymmetry	Critical
Spinal	Intercostals / anterior spinal	Paraplegia, lower limb weakness, loss of sensation	Critical
Renal	Renal arteries	Oliguria, haematuria, rising creatinine	Urgent
Mesenteric	SMA / coeliac	Abdominal pain, distension, bloody stool, raised lactate	Critical
Limb	Iliac / subclavian	Cold pulseless limb, pain, pallor, paraesthesia	Critical

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Cardiac Tamponade (Type A Complication)

Beck's Triad

1. HypotensionSBP drop, narrow pulse pressure

2. Muffled heart soundsPericardial blood dampens sounds

3. JVD / raised JVPVenous backpressure from RV compression

Pulsus Paradoxus

SBP drop >10 mmHg on inspiration. Measure during normal breathing using sphygmomanometer — note SBP at which sounds first heard vs at which audible throughout respiratory cycle. Gap >10 = positive.

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Tamponade in aortic dissection = haemopericardium. Pericardiocentesis is generally CONTRAINDICATED (removes tamponade effect → may cause catastrophic haemorrhage). Immediate surgical intervention required.

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Aortic Rupture Signs

Clinical Features of Impending/Actual Rupture

Sudden haemodynamic collapse — profound hypotension
Loss of consciousness or rapid GCS decline
Massive haemothorax — increasing pleural effusion on CXR, decreased breath sounds
Widening pulse pressure then loss of pulse
Sudden cessation of chest drain output followed by haemodynamic collapse (clot occlusion)

Immediate Response

Call for immediate help — cardiac arrest team if collapsed
Airway/Breathing — 15 L O₂ non-rebreathe
Large-bore IV fluid (cautious — target MAP 50–60 permissive hypotension pre-surgical control)
Activate massive transfusion protocol
Immediate surgical team alert — emergency theatre

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Nursing Documentation Essentials

Vital Signs Documentation

BP both arms — document RIGHT and LEFT separately on every entry
BP differential calculated and recorded
HR (from arterial line trace — most accurate)
RR and SpO₂ continuous
Temperature hourly (post-op re-warming monitoring)
Pain VAS score hourly — and before/after each analgesic dose

Neurovascular Observations

GCS: E/V/M — total score + components
Pupils: size (mm), reactivity, equality
Upper limbs: grip strength bilaterally
Lower limbs: dorsiflexion, plantar flexion, sensation
Peripheral vascular: all six Ps (pain, pallor, pulselessness, paraesthesia, paralysis, poikilothermia)
Hourly documentation for minimum 48h post-admission

Fluid Balance & Outputs

Hourly urine output — mL and mL/kg/hr
Chest drain output — mL/hr (post-op)
IV fluid input — all bags, blood products, drug infusions
Cumulative fluid balance 4-hourly
Oral intake if applicable
Blood glucose 1–4 hourly post-op

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Long-Term Medical Therapy & Discharge Planning

Lifelong Medications

Beta-blockers: Lifelong — first-line antihypertensive, reduces aortic wall stress and risk of re-dissection
BP target: <130/80 mmHg in clinic (ambulatory BP monitoring recommended)
ACE inhibitor or ARB: Added if beta-blocker alone insufficient or in patients with Marfan syndrome (losartan has evidence for aortic protection)
Annual CT surveillance: Lifelong — monitor residual false lumen, aortic diameter, exclude re-dissection

Patient Education & Restrictions

Driving restrictions: do not drive until off IV antihypertensive therapy and BP stable on oral medications (liaise with cardiologist and DVLA/local authority equivalent)
Avoid isometric exercise (heavy lifting, straining) — raises aortic shear stress
Aerobic exercise encouraged once stable — walking, swimming
Blood pressure self-monitoring at home — patient education on home BP cuffs
Alert bracelet or card carrying diagnosis
Family screening for Marfan syndrome if identified
Return to ED immediately if chest or back pain recurs

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Stanford A vs B — Exam Comparison Table

Feature	Stanford Type A	Stanford Type B
Aortic location	Ascending ± arch ± descending	Descending only (beyond L subclavian)
DeBakey equivalent	Types I and II	Type III (IIIa/IIIb)
Primary management	Emergency open surgery	IV antihypertensive therapy
Drug of choice	Labetalol IV (pre-op BP control)	Labetalol IV or Esmolol IV
Surgical procedure	Ascending aorta + root replacement	TEVAR if complicated
BP target	SBP 100–120 while awaiting theatre	SBP 100–120, HR <60 ongoing
Tamponade risk	HIGH — haemopericardium	Low
AR murmur	Yes — aortic root involvement	No
Stroke risk	High — carotid/innominate	Low (unless extensive)
30-day mortality (treated)	~15–25%	~10%

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Drug Quick Reference — BP Management

Drug	Class	Dose	Key Point
Labetalol	Alpha + Beta blocker	20 mg IV bolus; repeat 40–80 mg q10min; max 300 mg; then 1–2 mg/min infusion	First-line choice — reduces HR and BP
Esmolol	Beta-1 selective (short-acting)	500 mcg/kg loading; 50–200 mcg/kg/min infusion	Preferred when rapid reversibility needed
Nicardipine	Dihydropyridine CCB	5–15 mg/hr IV infusion	Add-on if BP not controlled with beta-blocker
Morphine	Opioid analgesic	2–4 mg IV q5–10min titrated	Reduces sympathetic drive — haemodynamic benefit
Sodium Nitroprusside	Vasodilator	0.3–10 mcg/kg/min	AVOID alone — reflex tachycardia worsens shear

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Differential Diagnosis — Aortic Dissection vs ACS vs PE

Feature	Aortic Dissection	ACS (NSTEMI/STEMI)	PE
Pain onset	SUDDEN — maximum at onset	Gradual, builds up	Sudden (pleuritic)
Pain character	Tearing, ripping	Crushing, pressure, squeezing	Sharp, pleuritic
Radiation	Back / interscapular	Left arm, jaw, neck	Usually localised chest
BP differential	YES — >20 mmHg	No	No
Troponin	Usually normal / mildly elevated	ELEVATED	Can be mildly elevated
ECG	Usually normal or non-specific	ST elevation/depression	S1Q3T3, sinus tachycardia, RBBB
CXR	Widened mediastinum	Pulmonary oedema (LVF)	Wedge infarct, oligaemia, normal
D-dimer	Often elevated (non-specific)	Normal	ELEVATED (sensitive)
Key danger	Thrombolytics = FATAL	Delay = myocardial death	Thrombolytics if massive

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Malperfusion Quick Reference — Exam Table

Syndrome	Key Clinical Signs	Nursing Alert
Coronary malperfusion	Inferior ST changes, chest pain, haemodynamic instability	Do NOT give thrombolytics — alert surgical team
Cerebral malperfusion	Hemiplegia, facial droop, dysphasia, reduced GCS	Thrombolytics CONTRAINDICATED — urgent CT head
Spinal malperfusion	Lower limb weakness, paraplegia, loss of sensation below level	Maintain MAP >90 — spinal cord perfusion
Renal malperfusion	Oliguria, haematuria, rising creatinine, hypertension	Hourly UO, daily U&E, RRT preparation
Mesenteric malperfusion	Abdominal pain, distension, raised lactate, bloody diarrhoea	Highest mortality — immediate surgical review
Limb malperfusion	Cold, pale, pulseless, painful limb — 6 Ps	Hourly neurovascular obs — endovascular intervention

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DHA / DOH / SCFHS / QCHP — High-Yield Questions

Q: A patient presents with sudden severe tearing chest pain radiating to the back. BP right arm 180/100, left arm 145/85. What is the priority action? ▼

Answer: The BP differential >20 mmHg (35 mmHg here) combined with classic tearing back pain makes aortic dissection highly likely. Priority action: activate emergency team, obtain IV access x2, arrange urgent CTA — do NOT give thrombolytics. Document bilateral BP readings and notify senior immediately.

Q: Which drug class must be given BEFORE vasodilators in aortic dissection BP management and why? ▼

Answer: Beta-blockers must be given first (e.g., labetalol or esmolol). Vasodilators used alone cause reflex sympathetic activation → tachycardia → increases the rate of rise of aortic pressure (dP/dt) → worsens dissection propagation and aortic wall stress. Beta-blockade prevents this reflex tachycardia.

Q: What is the management distinction between Stanford Type A and Type B dissection? ▼

Answer: Type A (ascending aorta) = SURGICAL EMERGENCY. Door-to-theatre goal <4 hours (ideally <2h). Mortality without surgery ~1–2%/hour. Type B (descending only) = Medical management — IV labetalol/esmolol, BP target SBP 100–120 mmHg, HR <60 bpm. Surgical/TEVAR intervention only if complicated (malperfusion, rupture, uncontrolled pain, rapid expansion).

Q: A Type A post-op patient on ICU has hourly neuro obs showing new left-sided weakness. What is your immediate action? ▼

Answer: New focal neurological deficit post-Type A repair indicates possible cerebral malperfusion / embolic stroke. Immediate actions: (1) Complete full GCS assessment and neuro obs (2) Escalate to senior/intensivist immediately (3) Ensure normoglycaemia and normothermia (4) CT head as directed (5) Neurology/neurosurgery review (6) Maintain MAP >65 mmHg (7) Document time of deficit onset — critical for management decisions. Do NOT give thrombolytics.

Q: Beck's Triad — components and significance in aortic dissection? ▼

Answer: Beck's Triad = (1) Hypotension (2) Muffled/distant heart sounds (3) Elevated JVP. Indicates pericardial tamponade from haemopericardium — a life-threatening complication of Type A dissection. Pericardiocentesis is CONTRAINDICATED — releases tamponade effect and can cause catastrophic haemorrhage. Definitive treatment = emergency surgery.

Q: What is the DeBakey classification and how does it relate to Stanford? ▼

Answer: DeBakey classifies by origin and extent: Type I = originates in ascending, extends through arch into descending (= Stanford A, extensive). Type II = limited to ascending aorta only (= Stanford A, limited — common in Marfan). Type III = originates in descending aorta distal to left subclavian (= Stanford B). Stanford is simpler for clinical decision-making (A = surgery, B = medical).

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Aortic Dissection Risk & Management Guide

Enter patient presentation details to assess suspicion level and display nursing priorities. For educational use only — always apply clinical judgement.

Clinical Suspicion Assessment

Pain Onset

Pain Character

BP Right Arm (SBP mmHg)

BP Left Arm (SBP mmHg)

Stanford Type (if confirmed / suspected)

Neurological Signs Present?

Haemodynamic Status