PCAS is the complex pathophysiological state that follows resuscitation from cardiac arrest. Understanding its four components guides all post-ROSC nursing priorities.
1. Post-Arrest Brain Injury
Global cerebral ischaemia followed by reperfusion injury. Leading cause of death and disability post-ROSC. Manifests as coma, seizures, cognitive impairment, or brain death.
2. Post-Arrest Myocardial Dysfunction
Transient LV/RV dysfunction (myocardial stunning) even without acute MI. Usually reversible within 24–72 hours. Presents as cardiogenic shock or reduced EF on echo.
4. Precipitating Pathology
The original cause must be identified and treated: ACS/STEMI, massive PE, tension pneumothorax, electrolyte abnormality, drug toxicity, hypoxia, hypothermia.
✓ROSC Definition & Quality Assessment
ROSC (Return of Spontaneous Circulation): Restoration of a perfusing cardiac rhythm with a palpable pulse lasting >20 seconds, producing a measurable blood pressure.
Signs of ROSC — in order of appearance
Sign
Significance
Notes
End-tidal CO2 rise
FIRST physiological sign of ROSC
EtCO2 sudden rise >40 mmHg during CPR strongly indicates ROSC — do not interrupt compressions to check pulse, confirm rise first
Palpable central pulse
Clinical confirmation
Carotid or femoral — check only after EtCO2 rise; brief 10-second check
Arterial waveform
Gold standard if A-line in situ
Continuous invasive BP monitoring — spontaneous pulsatile waveform confirms ROSC and allows haemodynamic monitoring immediately
SpO2 waveform
Supportive
May take 1–2 min to register post-ROSC due to peripheral vasoconstriction
Spontaneous movement/breathing
Clinical sign
Coughing, purposeful movement, spontaneous breaths — indicates some neurological recovery
⚠Golden 5 Minutes Post-ROSC — Nursing Priorities
Immediate actions in the first 5 minutes determine trajectory. Assign a dedicated nurse to document time, vitals, and interventions.
Airway & Breathing
Confirm ETT position — EtCO2 waveform, chest rise, auscultation
Obtain ABG within 5 minutes — pH, PaO2, PaCO2, lactate
Titrate FiO2 to SpO2 94–98% — avoid 100% O2
Set ventilator: TV 6 ml/kg IBW, RR 10–12, target normocapnia
Pupillary response bilaterally — document size and reactivity
Check core temperature — commence TTM protocol if comatose
Commence seizure monitoring — clinical and EEG
Documentation
Record time of ROSC precisely
Document duration of CPR (downtime)
Record initial rhythm at ROSC (VF, pulseless VT, PEA, asystole)
Brief family update — assign a nurse or doctor immediately
⇄Decision Point: Consciousness Post-ROSC
Does the patient follow commands or open eyes to voice post-ROSC?
YES — Awake / Responsive
Standard post-arrest monitoring
TTM not required but fever prevention essential
Coronary angiography per STEMI/ECG findings
Neurological assessment q1h
Early extubation consideration
NO — Comatose (GCS <8)
Initiate TTM — fever prevention minimum
Continuous EEG monitoring
ICU admission mandatory
Neuroprognostication at 72h+
Family communication — guarded prognosis
♥Coronary Angiography Urgency Decision
Immediate Cath Lab (<2 hours)
STEMI pattern on ECG, new LBBB, haemodynamic instability/cardiogenic shock, persistent ischaemia signs. Do not delay for CT brain if STEMI is present.
Urgent but not Immediate (2–24 hrs)
No ST elevation, haemodynamically stable, ECG non-diagnostic. Consider CT brain and stabilisation before angiography. Discuss with cardiology.
Nursing role: Contact cath lab team immediately if STEMI identified. Prepare patient for transfer — ensure stable airway, IV access, brief documentation, defibrillator available for transfer.
❄Targeted Temperature Management — Rationale
Therapeutic hypothermia was introduced to reduce secondary brain injury by decreasing cerebral metabolic demand during the vulnerable post-ischaemic reperfusion period. The approach has evolved significantly since the TTM2 trial.
Mechanism: For every 1°C reduction in brain temperature, cerebral metabolic rate decreases ~7%. Hypothermia also reduces excitotoxicity, free radical production, apoptosis, and inflammatory cascade activation post-ischaemia.
📄Current Evidence TTM2 TRIAL 2021
TTM2 Trial (NEJM 2021): 1861 patients — hypothermia 33°C vs normothermia 37°C (strict fever prevention). No significant difference in mortality at 6 months or neurological outcome. Hypothermia group had higher rates of arrhythmia.
Parameter
Hypothermia (33°C)
Normothermia (37°C)
6-month mortality
50%
48%
Poor neurological outcome
55%
55%
Arrhythmia rate
Higher
Lower
Conclusion
No benefit of 33°C over strict 37°C normothermia
Current Recommendation (ERC/AHA 2021+): Actively prevent fever >37.7°C for a minimum of 72 hours in all comatose post-ROSC patients. This is now the standard of care — NOT 33°C unless specific indication.
♨Temperature Monitoring
Recommended Methods (Most to Least Accurate)
Site
Accuracy
Notes
Oesophageal probe
Gold standard
Closest to core/cardiac temperature, continuous, real-time
Bladder (urinary catheter)
Good
Adequate if urine output maintained; lags with low UO
Rectal
Adequate
Lags by 20–30 min, useful if others unavailable
Pulmonary artery catheter
Best
Only if PA catheter already in situ — rarely used solely for temperature
Axillary / tympanic
Poor
Not reliable for TTM monitoring — avoid
Nursing Documentation
Record temperature every 30 minutes during active temperature management
Document which measurement site is being used
Alert physician if temperature >37.7°C despite cooling measures
Record temperature at ROSC (baseline), initiation of TTM, every hour during TTM, and every 2 hours during rewarming
☂Cooling Methods
External Cooling
Cooling blankets — widely available, adequate for fever prevention at 37°C target
Arctic Sun system — hydrogel pads with feedback control, highly accurate temperature servo-control
Ice packs — axillae, groin, neck — rapid initial cooling if device not immediately available
Cooling helmet — selective head cooling, limited evidence post-arrest
Internal / Endovascular Cooling
Cold saline infusion — 30 ml/kg 4°C normal saline IV for rapid induction (now less used given TTM2 data)
Cool Line / Thermogard catheter — endovascular temperature management, most accurate servo-control
CPB/ECMO circuit cooling — if patient on ECMO/E-CPR
⇧Rewarming Protocol
CRITICAL: Rewarming too fast can precipitate cerebral oedema, hyperthermia overshoot, electrolyte shifts (K+ rise), and haemodynamic instability.
Rewarming Rate
0.25°C/hr
Maximum safe rate
Target on Rewarming
37.0°C
Not exceeding 37.5°C
Fever Prev. Duration
72 hrs
Minimum post-ROSC
Nursing Actions During Rewarming
Monitor potassium every 2 hours — hypokalaemia during cooling reverses to hyperkalaemia on rewarming
Watch for haemodynamic instability — vasodilation on rewarming may require fluid or vasopressor adjustment
Blood glucose monitoring every 1–2 hours — insulin requirements change with temperature
Seizure vigilance increases during rewarming phase
Once normothermia achieved, continue active fever prevention for the remainder of 72-hour window
🕆Shivering Management
Shivering increases metabolic rate by up to 40%, negating the benefits of temperature management and increasing O2 demand. Use the BSAS (Bedside Shivering Assessment Scale) 0–3.
Step 3 Meperidine (pethidine) 25–50 mg IV — most effective pharmacological anti-shivering agent
Step 4 Propofol infusion — sedation also reduces shivering; titrate to comfort
Step 5 Neuromuscular blockade (vecuronium, cisatracurium) — last resort; masks seizure activity — use only with continuous EEG monitoring
Note Document BSAS score hourly during TTM. If NMB used, ensure EEG is running — do NOT use NMB without EEG.
✦Haemodynamic Targets Post-ROSC
SBP Target
≥100 mmHg
Avoid hypotension — worsens brain injury
MAP Target
65–70 mmHg
Minimum; higher (80–100) if STEMI/shock
SpO2 Target
94–98%
Avoid hyperoxia (reperfusion injury)
PaO2 Target
9–13 kPa
~68–98 mmHg — normoxia
PaCO2 Target
35–45 mmHg
4.7–6.0 kPa — normocapnia
Glucose Target
7.8–10 mmol/L
Avoid hypoglycaemia — equally harmful
▼Avoid Hypotension — Why It Matters
Hypotension post-ROSC (SBP <90 mmHg, MAP <65 mmHg) is independently associated with worse neurological outcome and increased mortality. It impairs cerebral perfusion pressure in an already injured brain with disrupted autoregulation.
Phosphodiesterase inhibitor — vasodilation side effect; use with vasopressor
Vasopressin
Refractory vasodilatory shock
0.03–0.04 units/min IV
Adjunct to noradrenaline; not first-line
♪Post-Arrest Myocardial Stunning
Definition: Transient LV (and/or RV) dysfunction following successful resuscitation, independent of acute coronary occlusion. Usually recovers spontaneously within 24–72 hours with haemodynamic support.
Clinical Features
Reduced LVEF on echocardiography
Cardiogenic shock pattern (low CO, high SVR)
Pulmonary oedema
Troponin rise (non-specific)
Management
Echocardiography as soon as feasible post-ROSC
Inotropic support if CI <2.2 L/min/m² — dobutamine first-line
IABP if refractory cardiogenic shock and PCI planned
ECMO (VA-ECMO) in extreme refractory cardiogenic shock
Monitor daily echo for recovery — most recover 48–72 hours
Avoid aggressive diuresis in early phase
⚠Avoid Hyperoxia & Hypocapnia — Nursing Vigilance
Hyperoxia Harms: PaO2 >13 kPa (100 mmHg) or SpO2 >98% is associated with worse neurological outcome. Reactive oxygen species cause reperfusion injury to the post-ischaemic brain. Titrate FiO2 down progressively — target SpO2 94–98%.
Hypocapnia Harms: PaCO2 <35 mmHg causes cerebral vasoconstriction, reducing cerebral blood flow to an already compromised brain. Hyperventilation must be avoided — common error post-arrest. Target normocapnia 35–45 mmHg. Check ABG within 15 min of ROSC and again at 1 hour.
◆Glucose Management
Target blood glucose 7.8–10 mmol/L (140–180 mg/dL). Hyperglycaemia post-arrest worsens neurological outcome via excitotoxicity; hypoglycaemia equally dangerous — check glucose every 1–2 hours, more frequently if on insulin infusion.
Check glucose at ROSC, 30 min, 1 hour, then q2h
Start insulin infusion protocol if glucose >10 mmol/L
Continuous glucose monitoring if available
Do NOT aim for tight glycaemic control (<6 mmol/L) — hypoglycaemia causes neuronal death
Temperature affects glucose metabolism — levels shift during TTM/rewarming
If glucose <4 mmol/L — give 50 ml 50% dextrose IV immediately
Enteral nutrition can be started early (24–48 hrs) once haemodynamically stable
●Neurological Monitoring
Continuous EEG Monitoring
Seizures and status epilepticus occur in 20–30% of comatose post-arrest patients. Many are subclinical (non-convulsive). Continuous EEG is recommended for all comatose post-ROSC patients.
Apply EEG as soon as possible post-ROSC in comatose patients
>60 mcg/L at 72 hrs; rising trajectory worse than single threshold
EEG
24–72 hrs
Malignant patterns: burst suppression, suppressed background, status epilepticus refractory
CT Brain
24–72 hrs
Loss of grey-white differentiation, diffuse cerebral oedema, sulcal effacement
MRI Brain (DWI/ADC)
72 hrs – 5 days
Extensive restricted diffusion on DWI — diffuse cortical and subcortical injury
Automated Pupillometry
72 hrs
qPLR <0.1 bilaterally
⚠Neuroprognostication — Timing & Principles
CRITICAL NURSING AWARENESS: Premature prognostication leads to self-fulfilling prophecy — withdrawal of care based on early findings results in death in patients who might have recovered. This is a major patient safety issue.
Minimum Timing Before Prognostication
At least 72 hours after ROSC
If TTM/cooling was used — 72 hours after completion of rewarming to normothermia
Sedation and NMB must be cleared — allow washout period
Involve neurology/neurocritical care in the assessment
Document all findings with timestamps
Ethics committee involvement when appropriate
💬Family Communication — Neurological Uncertainty
Key message to families: "We are providing the best possible care for your loved one. The brain has been injured during the cardiac arrest, and we need time to fully assess the extent of that injury. We will update you regularly and will not make any decisions without involving you fully."
Explain the concept of "wait and see" clearly — uncertainty is honest, not evasive
Avoid statements like "brain dead" unless formally confirmed with all criteria met
Assign a primary family liaison nurse — consistency reduces anxiety and miscommunication
Provide written information about post-cardiac arrest syndrome if available in the patient's language
Document all family conversations in medical records with date, time, persons present, and content
👥Survival Statistics — Realistic Framework
Out-of-Hospital Cardiac Arrest (OHCA):
Overall survival to hospital discharge: approximately 10% globally. Survival with good neurological outcome: 7–8%. Factors improving outcome: witnessed arrest, bystander CPR, shockable rhythm (VF/VT), short response time.
In-Hospital Cardiac Arrest (IHCA):
Survival to discharge: 20–25% in well-equipped centres. Better outcomes due to witnessed arrest, rapid response, shockable rhythms more amenable to immediate defibrillation.
Note for GCC context: Published GCC survival data remains limited. UAE bystander CPR rates are improving following national campaigns. Outcomes in major centres (CCAD, HMC, KFSHRC) are increasingly comparable to international benchmarks.
👥Family Presence During Resuscitation
Evidence supports family presence during CPR when families wish it. Studies show it does not interfere with resuscitation quality, reduces family anxiety, facilitates grief, and improves family satisfaction — regardless of outcome.
Nursing Role
Assign a dedicated nurse (not involved in resuscitation) to accompany the family
Provide clear, calm explanations of what is happening — avoid clinical jargon
Maintain dignity of the patient at all times
If family becomes distressed in a way that interferes with care, gently escort to a private area
Document family presence and their response
Offer pastoral care / chaplaincy support immediately
Structured Communication Framework (SPIKES / GCC-adapted)
Step
Action
Example Language
S — Setting
Private room, seated, family support person present
"Let's find a quiet place to talk."
P — Perception
Assess what family already understands
"Can you tell me what you've been told so far?"
I — Information
Ask permission to share news
"I need to share some serious news with you. Are you ready?"
K — Knowledge
Deliver news clearly and concisely
"Your [relative]'s heart stopped. We performed CPR and the heart has started again. However, we don't yet know the extent of any brain injury."
E — Empathy
Acknowledge emotion, allow silence
"This is an incredibly difficult situation. Take your time."
S — Summary
Outline the plan and next steps
"We are doing everything possible. We will reassess over the next 24–72 hours and will update you regularly."
ⓘWithdrawal of Life-Sustaining Treatment (WLST)
Timing: WLST should only be considered when all prognostic modalities (clinical, EEG, SSEP, biomarkers, imaging) consistently indicate no reasonable chance of meaningful neurological recovery, AND a minimum of 72 hours has elapsed post-ROSC (or post-TTM completion).
Criteria for Consideration
Bilateral absent N20 on SSEP
Absent pupillary and corneal reflexes at 72 hrs
Malignant EEG pattern persisting
NSE >60 mcg/L with rising trend
Extensive DWI changes on MRI
Multidisciplinary team agreement including neurology
Process
Full MDT meeting — intensivist, neurologist, cardiologist, nursing team
Family meeting with senior physician — explain findings in accessible language
Allow family time to process — cultural and religious consultation if requested
Palliative care team involvement — comfort-focused care
Document all discussions, decisions, and family consent
Ethics committee consultation if disagreement arises
♥Organ Donation Consideration
When death is inevitable — whether through WLST or progression to brain death — the organ donation conversation should be initiated by trained staff (separate from the treating team in most centres). Refer to the dedicated organ donation guide for the full protocol.
Separate the notification of death/dying from the organ donation request — do not conflate
Contact organ donation coordinator before approaching family
Allow family time to absorb news before introducing the conversation
Respect cultural and religious context in GCC — Islamic jurisprudence on organ donation varies by country
☼GCC Cultural Considerations
Expectation of aggressive treatment: GCC families often expect maximal treatment continuation regardless of prognosis, influenced by cultural values of family loyalty, religious beliefs about life and death, and distrust of withdrawal of care. This requires sensitive, repeated communication — never a single "decision meeting."
Involve the family patriarch/senior male family member early in communication — culturally appropriate in many GCC families
Religious guidance: many families appreciate direct involvement of a hospital chaplain or Islamic scholar
Avoid Western frameworks that prioritise individual patient autonomy over family decision-making
Language: use a professional medical interpreter — never a family member for complex prognostic discussions
Document cultural considerations and communication approach in the notes
🌎OHCA in the GCC — Current Landscape
UAE Data & Progress
Bystander CPR rates historically low — now improving with national campaigns (Dubai Corporation for Ambulance Services, Abu Dhabi DOH CPR initiatives)
AED availability significantly expanded — malls, airports, metro stations, public spaces across UAE
Mandatory CPR training in some educational institutions (UAE school curriculum pilot)
Response times improving — ADCD and Dubai Ambulance dispatch systems upgraded
Urinary catheter draining, bag emptied pre-transfer
Complete transfer documentation: SBAR handover, drug chart, allergies, family contact
Receiving team briefed by phone pre-departure
Family informed of transfer — destination, contact number
▲Post-Arrest Rehabilitation — Often Neglected
Cognitive and psychological sequelae after cardiac arrest are common but frequently under-recognised in GCC follow-up pathways. Up to 50% of survivors experience significant cognitive impairment; 30% have anxiety/depression; PTSD rates 15–30%.