Haemodynamic Monitoring Guide for GCC ICU/CCU Nurses 2025

Haemodynamic Parameters & Normal Values

Key parameters monitored in the ICU/CCU — understanding these values is fundamental to recognising haemodynamic instability and guiding treatment.

Parameter	Normal Range	Formula / Derived From	Clinical Significance
Heart Rate (HR)	60–100 bpm	Direct	Tachycardia may indicate compensatory response; bradycardia can reduce CO
MAP (Mean Arterial Pressure)	70–100 mmHg	DBP + (SBP−DBP)/3 or (SBP + 2×DBP) / 3	MAP <65 = organ hypoperfusion. Target ≥65 in septic shock; 80–100 in TBI
CVP (Central Venous Pressure)	2–8 mmHg	Direct (CVC or PICC)	8–12 mmHg in mechanically ventilated. Reflects right atrial filling pressure
PCWP / PAWP	8–12 mmHg	PA catheter (wedged)	Reflects left atrial filling pressure; >18 suggests cardiogenic pulmonary oedema
Cardiac Output (CO)	4–8 L/min	HR × Stroke Volume	Low CO in cardiogenic / hypovolaemic shock; high in early sepsis
Cardiac Index (CI)	2.5–4.0 L/min/m²	CO / BSA	Body-size adjusted CO; CI <2.2 = cardiogenic shock threshold
SVR (Systemic Vascular Resistance)	800–1200 dyn·s·cm⁻⁵	[(MAP−CVP) / CO] × 80	Elevated in hypovolaemic/cardiogenic shock; low in distributive shock
PVR (Pulmonary Vascular Resistance)	100–250 dyn·s·cm⁻⁵	[(MPAP−PCWP) / CO] × 80	Elevated in pulmonary hypertension, PE, ARDS
SvO₂ (Mixed Venous O₂ Sat.)	65–75%	PA catheter (distal port)	<65% = increased O₂ extraction (low CO, anaemia, high demand)
ScvO₂ (Central Venous O₂ Sat.)	70–80%	CVC blood sample	Surrogate for SvO₂; <70% in septic shock is a resuscitation target
Stroke Volume (SV)	60–100 mL/beat	CO / HR × 1000	Reduced by hypovolaemia, poor contractility, or high afterload
Stroke Volume Variation (SVV)	<10–13%	Arterial waveform analysis	SVV >13% in ventilated patient = likely fluid responsive

🩺 MAP — Why It Matters

MAP <65 mmHg — critical threshold for organ perfusion; start vasopressors in septic shock
Target MAP ≥65 — Surviving Sepsis Campaign target for septic shock
Target MAP 80–100 — traumatic brain injury (TBI) to maintain cerebral perfusion pressure
Target MAP ≥65–70 — acute kidney injury, post-cardiac surgery
MAP is the pressure driving blood flow to organs — more relevant than systolic BP alone

📊 Derived Parameters — Quick Reference

CI <2.2 L/min/m² — cardiogenic shock; consider inotropes
SVR >1200 — vasoconstriction (hypovolaemia, cardiogenic shock) — consider vasodilators if CO adequate
SVR <800 — vasodilation (sepsis, anaphylaxis) — vasopressors indicated
SVV >13% — fluid responsive (only valid in controlled mechanical ventilation, regular rhythm, no spontaneous breathing)
ScvO₂ <70% — inadequate O₂ delivery; reassess CO, Hb, FiO₂

💡 GCC Practice Note: Most GCC tertiary ICUs use thermodilution (PiCCO or PA catheter) for CO/CI measurement. FloTrac/Vigileo and PiCCO are widely used in Saudi Arabia, UAE and Qatar hospitals for minimally invasive CO monitoring. SVV is available on most modern monitors when an arterial line is in situ.

Interactive MAP Calculator

Enter the patient's blood pressure readings to calculate MAP and clinical interpretation.

Systolic BP (SBP) — mmHg

Diastolic BP (DBP) — mmHg

MAP (SBP + 2×DBP)/3 —

Pulse Pressure (SBP − DBP) —

Status —

Arterial Line Nursing

Arterial lines provide continuous, real-time blood pressure monitoring and arterial access for frequent blood sampling — essential in ICU/CCU patients on vasoactive drugs or requiring frequent ABGs.

✅ Indications for Arterial Line

Continuous, beat-to-beat blood pressure monitoring
Haemodynamic instability — vasopressor/vasodilator infusions
Frequent arterial blood gas (ABG) sampling
Inadequate NIBP readings (obesity, arrhythmias, hypotension)
Major cardiac/thoracic/vascular surgery
Intra-aortic balloon pump (IABP) monitoring
SVV/PPV monitoring for fluid responsiveness

📍 Insertion Sites

Radial (most common) — non-dominant hand preferred; check Allen test first
Femoral — large vessel, reliable in shock, higher infection risk
Brachial — used when radial not accessible; end-artery risk
Axillary — less common; good central pressure waveform
Ulnar — if radial failed/occluded; confirm radial collateral first
Dorsalis pedis — alternative lower limb site

⚠️ Allen Test: Occlude both radial AND ulnar arteries simultaneously. Release the ulnar only. Observe the hand — flushing pink within 5–7 seconds confirms adequate collateral circulation (NORMAL). Failure to flush within 7s (ABNORMAL) suggests poor ulnar collateral — consider alternative site. Document result.

Setup & Zeroing

⚙️ Arterial Line Setup — Step-by-Step

Assemble transducer system — connect non-compliant pressure tubing; attach flush bag inflated to 300 mmHg; flush fully to remove all air bubbles
Level to phlebostatic axis — 4th intercostal space, mid-axillary line; re-level with every position change
Zero the transducer — open stopcock to air, press ZERO on monitor, close stopcock; zero at start of each shift and after repositioning
Square wave test — fast flush; crisp square wave with 1–2 oscillations = optimal damping; document insertion date, site, dressing status

Arterial Waveform Interpretation & Troubleshooting

📈 Normal waveform: sharp systolic upstroke → systolic peak → dicrotic notch (aortic valve closure) → diastolic trough. The dicrotic notch is a key landmark confirming a well-damped waveform.

Waveform Issue	Appearance	BP Effect	Common Causes	Action
Overdamped	Rounded, slurred — no dicrotic notch	↓SBP, ↑DBP	Air bubbles, clot at tip, kinked tubing, loose connections	Fast flush, check all connections, reposition catheter
Underdamped	Exaggerated, spiky, ringing artefact	↑SBP, ↓DBP	Stiff/short tubing, tachycardia, hyperdynamic state	Add resonance-reducing device; check tubing length
Optimal (normal)	Crisp square wave: 1–2 oscillations then return to baseline	Accurate	Well-assembled, air-free system	Document and continue monitoring

Complications & Nursing Vigilance

🚨 CRITICAL SAFETY — Label ALL arterial lines RED: Accidental drug injection into an arterial line is a catastrophic complication causing distal limb ischaemia, necrosis and potential amputation. All arterial lines must be clearly labelled "ARTERIAL LINE — DO NOT INJECT" with RED labelling per GCC hospital policy. Never connect IV fluids or drugs to the arterial port without verifying.

⚠️ Complications

Thrombosis — most common; maintain flush bag at 300 mmHg
Haematoma — at insertion site; apply pressure on removal
Distal ischaemia — limb threatening; check hourly circulation
Infection / CLABSI — strict aseptic technique; review daily
Accidental disconnection — haemorrhage risk; secure all connections
Nerve injury — at brachial/axillary sites

🖐️ Hourly Limb Assessment

Assess the hand/foot with arterial line every hour:

Colour — compare to contralateral limb
Warmth — cool or cold = compromised perfusion
Sensation — numbness / paraesthesia = nerve/vessel involvement
Capillary refill — >2 seconds = reduced perfusion
Movement — motor function in conscious patients
Document findings; escalate any abnormalities immediately

Central Venous Catheter & CVP Monitoring

Central venous access is fundamental to ICU care — understanding CVP interpretation and CVC nursing management is essential for all critical care nurses.

📋 CVC Indications

CVP monitoring (right atrial filling pressure)
Vasoactive drug infusions (vasopressors, inotropes)
Total Parenteral Nutrition (TPN)
Difficult peripheral IV access
Rapid large-volume fluid administration
Frequent blood sampling
Renal replacement therapy (Vascath/Tesio)
ScvO₂ monitoring via oximetric catheter

📍 CVC Sites & Considerations

Right Internal Jugular (preferred) — direct path to SVC/RA; lower pneumothorax risk than subclavian
Subclavian — higher pneumothorax risk; good long-term patency; comfortable for patient
Femoral — highest infection risk; use only when upper sites unavailable; avoid in ambulatory patients
Left Internal Jugular — longer, less direct route; increased risk of malposition
Confirm position by CXR before use (tip at SVC/RA junction)

CVP Interpretation

CVP Value	Interpretation	Common Causes	Nursing Action
<2 mmHg	Low — Hypovolaemia	Haemorrhage, dehydration, third-spacing, burns	Fluid challenge as per order; reassess after bolus
2–8 mmHg	Normal	Euvolaemia (spontaneously breathing)	Continue monitoring; correlate with clinical picture
8–12 mmHg	Normal (MV)	Mechanically ventilated patients — normal range	Expected; positive pressure increases CVP
>12 mmHg	Elevated	Fluid overload, RV failure, cardiac tamponade, tension pneumothorax, PEEP	Restrict fluids; inform physician; assess for tamponade signs (Beck's triad)

⚠️ CVP Limitations: CVP alone is a poor predictor of fluid responsiveness in critically ill patients (FEAST trial, ProCESS trial). A single CVP value should NEVER be used in isolation to guide fluid therapy. Integrate CVP with clinical assessment, passive leg raise test, SVV, CO/CI, and dynamic parameters for fluid management decisions.

CLABSI Prevention Bundle

🛡️ Five-Point CLABSI Bundle

Hand hygiene — 6-step WHO technique with ABHR before and after every CVC access
Maximal sterile barrier — sterile gloves, gown, mask, cap, full-body sterile drape during insertion
Chlorhexidine skin prep — >0.5% chlorhexidine gluconate in alcohol; allow to dry fully (>30 seconds) before insertion
Optimal site selection — prefer subclavian or IJV over femoral; use ultrasound guidance
Daily review & prompt removal — reassess necessity every ward round; remove when no longer indicated

🩹 CVC Dressing & Maintenance

Transparent semi-permeable dressing — change every 7 days or sooner if soiled, loose, or damp
Chlorhexidine-impregnated disc/patch at insertion site where available
Needleless access caps — change per hospital policy (typically 72–96h)
Scrub the hub for >15 seconds before access with 70% alcohol
Inspect insertion site at each dressing change for signs of infection
Blood cultures (peripheral + CVC) if infection suspected
Document: date of insertion, site, lumen patency, dressing condition

🔧 Troubleshooting CVC Issues

Blood aspiration difficulty — reposition patient (Trendelenburg for IJV), try gentle flush, ask patient to cough/change arm position
CVP waveform damping — check for clots, kinks, air; flush line carefully
Persistent low readings — verify transducer level (phlebostatic axis), zero the transducer
Infusion resistance — check for clot, positional occlusion; may require fibrinolytic (per order)
Signs of infection — redness, swelling, purulent discharge, fever → blood cultures, inform physician, consider line removal

Shock Recognition & Haemodynamic Patterns

Identifying shock type from haemodynamic parameters guides targeted resuscitation. Each shock type has a distinct haemodynamic fingerprint.

Shock Type	CO/CI	SVR	CVP	PCWP	Treatment Direction
Hypovolaemic	↓ Low	↑ High	↓ Low	↓ Low	IV fluids; identify and treat source of loss
Cardiogenic	↓↓ Very Low	↑ High	↑ High	↑ High	Inotropes (dobutamine); diuretics if congested; consider IABP
Distributive (Septic)	↑ High (early)	↓ Low	↓ Low	↓ Low	IV fluids (30 mL/kg bolus) + vasopressors (noradrenaline)
Obstructive (PE/Tamponade)	↓ Low	↑ High	↑ High	Variable	Relieve obstruction: pericardiocentesis, thrombolysis, thoracentesis
Neurogenic	↓ Low	↓ Low	↓ Low	↓ Low	Fluids + vasopressors; phenylephrine or noradrenaline
Anaphylactic	↓ Low	↓↓ Very Low	↓ Low	↓ Low	IM/IV adrenaline; IV fluids; antihistamines; corticosteroids

Vasopressor & Inotrope Reference

Drug	Class	Receptors / Mechanism	Haemodynamic Effect	Dose Range	Primary Use
Noradrenaline	1st-line vasopressor	α₁ >> β₁	↑ SVR, mild ↑ HR	0.01–3 mcg/kg/min	Septic/distributive shock — CVC only
Adrenaline	Vasopressor + inotrope	α₁, β₁, β₂	↑ CO, ↑ SVR, ↑ HR	0.01–1 mcg/kg/min	Cardiac arrest, anaphylaxis, refractory shock
Vasopressin	2nd-line vasopressor	V₁ receptor	↑ SVR (catecholamine-independent)	0.03–0.04 units/min (fixed)	Adjunct in refractory septic shock
Dopamine	Dose-dependent	DA / β₁ / α₁ (dose-dependent)	Low: renal; mid: ↑ CO; high: ↑ SVR	2–20 mcg/kg/min	Higher arrhythmia risk vs noradrenaline
Phenylephrine	Pure α vasopressor	Pure α₁	↑ SVR, reflex ↓ HR	0.5–9 mcg/kg/min	Neurogenic shock, vasodilation without tachycardia
Dobutamine	Primary inotrope	β₁ > β₂	↑ CO, ↓ SVR, ↑ HR	2–20 mcg/kg/min	Cardiogenic shock, low CO states
Milrinone	PDE3 inhibitor	↑ cAMP → inotropy + vasodilation	↑ CO, ↓ SVR, ↓ PCWP	0.375–0.75 mcg/kg/min	Post-cardiac surgery, RV failure; loading 50 mcg/kg
Levosimendan	Calcium sensitiser	Troponin C sensitisation + K-ATP channel	↑ CO, ↓ SVR — no ↑ O₂ demand	0.05–0.2 mcg/kg/min	Acute decompensated heart failure, cardiogenic shock

Lactate & Tissue Perfusion

🧪 Lactate Interpretation

<2 mmol/L — Normal
2–4 mmol/L — Raised; tissue hypoperfusion; consider cause and resuscitation
>4 mmol/L — Severe shock/tissue ischaemia; aggressive resuscitation; consider ICU escalation
Trend matters more than single value — lactate clearance ≥10% per 2h is a positive resuscitation sign
Target lactate clearance: >10% per hour in septic shock (Surviving Sepsis Campaign)
Other causes of elevated lactate: liver failure, metformin, thiamine deficiency, mesenteric ischaemia

🦵 Fluid Responsiveness Assessment

Passive Leg Raise (PLR) Test: Elevate legs to 45° for 60–90 seconds. If CO/SV increases ≥10% = fluid responsive. Fully reversible — no fluid given. Valid in spontaneously breathing patients.
SVV >13% — fluid responsive (mechanically ventilated, regular rhythm, no spontaneous breaths, tidal volume ≥8 mL/kg)
PPV (Pulse Pressure Variation) >13% — fluid responsive (same conditions as SVV)
Mini-fluid challenge — 100–200 mL over 1 min, measure CO change

Interactive Shock Type Identifier

Input key haemodynamic parameters to suggest probable shock type and treatment direction.

Cardiac Output (CO) — L/min

SVR — dyn·s·cm⁻⁵

CVP — mmHg

PCWP — mmHg (if available)

Probable Shock Type —

Haemodynamic Pattern —

Treatment Direction —

Advanced Haemodynamic Monitoring Devices

Beyond arterial lines and CVP — these devices provide cardiac output measurement and advanced haemodynamic data in GCC tertiary ICUs and cardiac units.

🫀

PA Catheter (Swan-Ganz)

Pulmonary Artery Catheter — Thermodilution

Gold standard for CO measurement; provides CO, CI, SVR, PVR, PCWP, SvO₂. Indicated in cardiogenic shock, complex cardiac surgery, refractory ARDS, pulmonary hypertension.

CO/CI SVR/PVR SvO₂ PCWP

📡

PiCCO System

Pulse Contour Cardiac Output — Transpulmonary TD

Less invasive than PA catheter. Requires central line + special arterial line (femoral/axillary). Calibrate with cold saline thermodilution every 8h or after fluid boluses/position changes. Provides CO, SVV, GEDV, EVLWI.

CO/CI SVV EVLWI GEDV

📊

FloTrac / Vigileo

Arterial Waveform Analysis — Edwards

Minimally invasive; connects to any standard arterial line. Autocalibrating — does not require thermodilution. Provides CO, SVV, SV. Less accurate in high SVR states or irregular rhythms. Widely used in post-cardiac surgery ICUs.

CO/CI SVV Autocalibrating

🎵

Oesophageal Doppler (CardioQ)

Doppler Flow — Descending Aorta

Non-invasive CO monitoring via flexible probe inserted nasally or orally into oesophagus. Measures aortic blood flow velocity. Nursing: insert to 35–45 cm mark, rotate to obtain maximum signal. Waveform: peak velocity, FTc (corrected flow time).

Non-invasive CO/CI FTc

🧠

NIRS / Cerebral Oximetry

Near-Infrared Spectroscopy (rSO₂)

Non-invasive cerebral tissue oxygen saturation. Forehead electrodes. Normal rSO₂: 60–75%. A drop >20% from baseline or absolute <50% triggers intervention. Used in cardiac surgery, carotid endarterectomy, ECMO.

Non-invasive rSO₂ 60–75% Alert <50%

💤

BIS Monitor

Bispectral Index — Sedation Monitoring

EEG-based processed measure of depth of sedation/anaesthesia. Scale 0–100 (0 = isoelectric, 100 = fully awake). Target BIS 40–60 for ICU sedation. 65–85 for procedural sedation. Reduces over-sedation and facilitates daily awakening trials.

ICU: 40–60 Procedural: 65–85 EEG-based

PA Catheter — Insertion Waveforms

📈 Pressure Waveforms During PA Catheter Flotation

Location	Waveform Appearance	Typical Pressures	Action
Right Atrium (RA)	Low amplitude a/v waves; similar to CVP	2–8 mmHg mean	Inflate balloon (1.5 mL air) and advance
Right Ventricle (RV)	High systolic, low diastolic — wide pulse pressure	15–30 / 0–8 mmHg	Watch for PVCs/arrhythmias; advance quickly
Pulmonary Artery (PA)	Dicrotic notch present; diastolic pressure higher than RV	15–30 / 8–15 mmHg	MPAP ~15–20; note position — continue to wedge
Wedge (PAWP)	Low amplitude, a/v waves; no dicrotic notch — similar to LA pressure	8–12 mmHg mean	Deflate balloon immediately after reading; NEVER leave inflated

🚨 PA Catheter Safety: NEVER over-inflate the balloon beyond 1.5 mL. NEVER leave the balloon inflated after wedge pressure reading — risk of PA rupture (catastrophic, potentially fatal haemorrhage). Always deflate passively. If persistent wedge waveform without balloon inflated = catheter has migrated distally — pull back immediately.

💊 LiDCO — Lithium Dilution CO

Calibration via peripheral IV lithium chloride bolus; arterial sensor calculates CO from concentration curve
LiDCOplus: intermittent calibration + continuous pulse contour; LiDCOrapid: population-based algorithm
Recalibrate after fluid boluses, vasopressor changes, or haemodynamic shifts
Contraindicated in patients on lithium therapy and neonates

✅ Nursing Care — Advanced Monitoring

Recalibrate PiCCO every 8h or after fluid bolus >500 mL, vasopressor change, or position change
Maintain specialised PiCCO arterial line dedicated lumen for thermodilution injectate
Check oesophageal Doppler probe position every 2–4h (migration alters readings)
Document BIS hourly alongside RASS; adjust sedation to target BIS 40–60
Report sudden CO, SVV, or EVLWI changes to physician promptly

Haemodynamic Parameter Calculator

Input key values to calculate Cardiac Index, SVR, and MAP from components.

MAP — mmHg

CVP — mmHg

Cardiac Output (CO) — L/min

Body Surface Area (BSA) — m²

SBP (for MAP check) — mmHg

DBP (for MAP check) — mmHg

MAP (from SBP/DBP) —

Cardiac Index (CI = CO/BSA) —

SVR = [(MAP−CVP)/CO] × 80 —

CI Interpretation —

SVR Interpretation —

Haemodynamic MonitoringGCC Nurse Guide