Cardiac Monitoring Guide — GCC CCU Nurses

📡 5-Lead Electrode Placement

Standard continuous monitoring in CCU uses 5 electrodes providing leads I, II, III, aVR, aVL, aVF, and one precordial lead.

⬜ RA
Right arm / below clavicle R

Christmas Tree
Mnemonic

⬛ LA
Left arm / below clavicle L

🟩 RL
Right leg / lower abdomen R

🟫 V lead
V1: 4th ICS right sternal border
V5/V6: lateral chest

🟥 LL
Left leg / lower abdomen L

💡

Mnemonic — "Christmas Tree": White on the right (snow on top), Black on the left (coal?), Green lower left, Red lower right. RL is neutral/ground — colour varies by system (green or black).

Lead	Best For	Clinical Use
Lead II	Best P-wave visibility; inferior MI detection	Default continuous monitoring lead
V1 / MCL1	RBBB vs LBBB differentiation; PVC vs aberrant conduction	Selected when bundle branch morphology matters
V5/V6	Lateral ischaemia, ST changes	Post-PCI monitoring, lateral STEMI surveillance

🔄 12-Lead vs Continuous Monitoring

Continuous (Bedside/Telemetry)

Ongoing real-time rhythm surveillance. Detects rate changes, arrhythmias, ST trends. Uses 3–5 leads simultaneously. Does NOT replace a 12-lead ECG.

12-Lead ECG

Snapshot recording of cardiac electrical activity from 12 perspectives. Required for ischaemia diagnosis, bundle branch block analysis, QT interval measurement, and any new symptom (chest pain, syncope, dyspnoea).

⚠️

Always obtain a 12-lead ECG for any new arrhythmia, chest pain, or haemodynamic change — do NOT rely solely on monitor strip for diagnosis.

📶 Hardwire vs Telemetry Monitoring

	Hardwire	Telemetry
Location	Bedside only	Ward / mobile
Signal	Wired cable	Radio frequency
Range	No movement	Typically 30–100 m
Indications	ICU/CCU, critically ill, haemodynamically unstable	Step-down, post-cath, stable arrhythmia, post-arrest observation
Signal loss	Rare (cable fault)	Interference, body position, distance

🔧 Artifact Troubleshooting

Artifact Type	Likely Cause	Solution
Baseline wander	Patient movement, respiration, poor electrode adhesion	Reposition electrodes away from muscle; ensure skin clean and dry
60 Hz / AC interference (thick fuzzy line)	Electrical equipment nearby, electrode disconnection	Check all connections; remove nearby electrical devices; replace electrodes
No signal / flat line	Lead disconnection, dried electrode gel, lead fracture	Verify connections; replace electrode; check cable integrity
Muscle tremor artefact	Shivering, Parkinson's, patient anxiety	Warm patient; reposition electrodes to bony prominences
False alarms	Poor contact mimicking VF/asystole; motion mimicking VT	Replace electrodes; reassess skin prep; adjust alarm thresholds per policy

🔔 Alarm Management — Joint Commission Safety Standards

🚨

Alarm fatigue is a patient safety priority. Over 85–99% of clinical alarms are non-actionable. The Joint Commission National Patient Safety Goal NPSG.06.01.01 mandates hospital alarm management policies.

Priority Alarms (Respond Immediately)

VF / pulseless VT
Asystole / extreme bradycardia (<30 bpm)
3rd degree heart block
Pacemaker failure to capture in pacemaker-dependent patient
QTc >500 ms (new)
ST change >1 mm from baseline

Alarm Reduction Strategies (GCC Policy)

Change electrodes every 24–48 hours (or per unit protocol)
Clean and dry skin before electrode application
Set individualised thresholds — not default factory settings
Document reason for alarm threshold changes
Conduct multi-disciplinary alarm safety huddles
Telemetry watcher (central monitoring) roles in larger GCC hospitals

📊 Systematic 5-Step Rhythm Interpretation

Rate

Regular rhythm: 300 ÷ number of large squares between R-R (e.g., 4 squares = 75 bpm)
Irregular rhythm: Count R waves in 6-second strip × 10
Normal: 60–100 bpm | Tachy: >100 | Brady: <60
Regularity

Measure consecutive R-R intervals with calipers or paper:
Regular — all R-R equal | Regularly irregular — pattern (e.g., Wenckebach) | Irregularly irregular — no pattern (AF)
P Waves

Present? Upright in II? One P before every QRS? Same morphology?
Absent P waves → AF, junctional. Sawtooth → atrial flutter. Retrograde P → junctional.
PR Interval

Normal: 0.12–0.20 s (3–5 small squares at 25 mm/s)
>0.20s = 1st degree block | Progressive lengthening = Wenckebach | Fixed prolonged with dropped QRS = Mobitz II
QRS Width

Normal: <0.12 s (<3 small squares)
Wide QRS ≥0.12s → BBB, WPW, paced rhythm, ventricular origin (VT, PVC)

📈 Common Rhythms & Nursing Actions

Normal Sinus Rhythm (NSR)

Rate 60–100; regular; upright P in II; PR 0.12–0.20s; QRS <0.12s

Document

Sinus Tachycardia

Rate >100; regular; P waves present; all intervals normal

Find cause (pain, fever, hypovolaemia, PE, anxiety); treat underlying

Sinus Bradycardia

Rate <60; regular; P waves normal; intervals normal

Assess symptoms; if haemodynamically unstable → Atropine 0.5 mg IV; prepare pacing

Atrial Fibrillation (AF)

Irregularly irregular; no distinct P waves (fibrillatory baseline); QRS usually narrow; rate variable

Rate control (beta-blocker, diltiazem, digoxin); anticoagulation assessment (CHA₂DS₂-VASc); 12-lead ECG

Atrial Flutter

Sawtooth flutter waves ~300/min; ventricular rate typically 150 bpm (2:1 block); regular

Rate control; cardioversion planning; anticoagulation as for AF

SVT (Supraventricular Tachycardia)

Narrow complex (<0.12s); abrupt onset/offset; rate often 150–250 bpm; P waves often hidden

Vagal manoeuvres (Valsalva, carotid sinus massage); if no response → Adenosine 6 mg rapid IV

1st Degree AV Block

PR interval >0.20s; every P followed by QRS; regular rhythm

Document; no treatment; identify cause (digoxin, beta-blocker)

2nd Degree — Mobitz I (Wenckebach)

Progressively lengthening PR → dropped QRS; R-R shortens before pause; regularly irregular

Usually benign; monitor; inform medical team; identify cause

2nd Degree — Mobitz II ⚠️

Fixed PR interval; intermittent dropped QRS with no warning; may have wide QRS

HIGH RISK — can progress to complete block; notify doctor urgently; prepare for transvenous pacing

3rd Degree Complete Heart Block ⚠️

Complete AV dissociation; P waves and QRS independent; ventricular escape rate 20–40 bpm; wide QRS

Emergency pacemaker; atropine generally ineffective for infranodal block; prepare transcutaneous pacing

Ventricular Tachycardia (VT)

Wide complex ≥0.12s; rate >100; ≥3 consecutive ventricular beats; AV dissociation; fusion beats

Pulseless VT → immediate unsynchronised defibrillation + CPR. Pulse present + stable → Amiodarone 150 mg IV. Unstable with pulse → synchronised cardioversion

Ventricular Fibrillation (VF)

Chaotic irregular waveform; no identifiable QRS complexes; no cardiac output

Immediate defibrillation 200 J biphasic; CPR; ACLS protocol; adrenaline 1 mg IV

Asystole

Flat line; verify in ≥2 leads; confirm lead connections before treating

CPR; Adrenaline 1 mg IV every 3–5 min; identify reversible causes (4 H's & 4 T's)

📏 Key Intervals — Quick Reference

Measurement	Normal Range	Small Squares (25 mm/s paper)
PR interval	0.12 – 0.20 s	3 – 5 squares
QRS duration	< 0.12 s	< 3 squares
QT interval	< 0.44 s (male) / <0.46 s (female)	< 11 squares
QTc >500 ms	Critical — risk of Torsades de Pointes; review QT-prolonging drugs
P wave duration	< 0.12 s	< 3 squares

🩸 Arterial Line (A-Line) Monitoring

Insertion Sites (Preferred Order)

Radial artery — first choice; perform Allen's test first
Femoral artery — large vessel; higher infection risk
Brachial artery — avoid if possible; end-artery in some
Dorsalis pedis, ulnar — alternatives

Allen's Test (Pre-Radial A-Line)

Occlude both radial and ulnar arteries (patient makes fist)
Release ulnar only — hand should flush pink within 5–7 seconds
>15 seconds = ABNORMAL — collateral circulation inadequate; choose alternative site

Arterial Waveform Components

Systolic upstroke — rapid ejection; slope reflects contractility
Systolic peak — SBP reading
Dicrotic notch — aortic valve closure; landmark on downstroke
Diastolic runoff — DBP at lowest point

🚫

Label line clearly: "ARTERIAL — NO MEDICATIONS". Inadvertent drug injection can cause catastrophic arterial spasm/tissue necrosis.

Zeroing Procedure

Position Transducer
Level transducer stopcock at the phlebostatic axis — 4th intercostal space, mid-axillary line (right atrial level). Use levelling device or laser.
Open to Air
Turn stopcock off to patient; open stopcock to atmosphere. Ensure no movement of patient or bed.
Zero on Monitor
Press "Zero" on bedside monitor. Confirm waveform reads 0 mmHg. Close stopcock to air; reopen to patient.
Document
Document time of zeroing. Re-zero after patient position changes, after circuit manipulation, or if readings are inconsistent.

Waveform Damping

Type	Cause	Effect on Readings	Action
Overdamped	Air bubbles, clot, kink, loose connection	Falsely LOW systolic; falsely HIGH diastolic; blunted waveform	Flush system; check for clot; remove air; check connections
Underdamped	Long tubing, stiff tubing, excessive tapping	Falsely HIGH systolic; falsely LOW diastolic; narrow spike appearance	Shorten tubing; use compliant tubing; minimise movement

Complications Monitoring

HAEMORRHAGE

Check connections regularly; never leave stopcock open; assess insertion site; ensure Luer-lock connections.

THROMBOSIS / DISTAL ISCHAEMIA

Hourly distal pulse check; assess colour, temperature, sensation of distal limb; document Allen's test result.

INFECTION

Sterile dressing changes per policy; assess site for redness/pus; change circuit per hospital protocol (typically 72–96 h).

📊 CVP Monitoring

Normal Range

2 – 8 mmHg

CVP reflects right atrial pressure and is a crude estimate of preload. Trend is more valuable than single reading.

CVP Trend	Interpretation
<2 mmHg	Hypovolaemia; fluid challenge may be indicated
2–8 mmHg	Normal; correlate with clinical picture
>12 mmHg	Right heart failure, cardiac tamponade, fluid overload, PEEP effect

⚠️

CVP alone should not guide fluid resuscitation. Use dynamic measures (PPV, PLR, fluid challenge) in ICU/CCU.

🧮 MAP Calculator

Mean Arterial Pressure = (SBP + 2 × DBP) ÷ 3

Target MAP ≥65 mmHg in sepsis / cardiogenic shock

SBP (mmHg)

DBP (mmHg)

Pulse Pressure Variation (PPV)

PPV = (PP_max − PP_min) / PP_mean × 100
PPV >13% in mechanically ventilated patients suggests fluid responsiveness.

💉 Cardiac Output Monitoring — Nursing Principles

Method	Principle	Nursing Role
PA Catheter (Swan-Ganz) Thermodilution	Cold saline bolus → temperature-time curve → CO calculation	Administer cold saline consistently; document CO, CI, PCWP; watch for arrhythmias on insertion; monitor balloon deflation
PiCCO Transpulmonary thermodilution	Calibration via central and arterial line; continuous CO via pulse contour	Recalibrate per protocol (position change, haemodynamic instability); ensure arterial line positioned correctly
USCOM Ultrasound cardiac output	Doppler measurement of aortic or pulmonary flow velocity	Non-invasive; nurse-led in some GCC centres; requires training; document CO and VTI values

⚡ Temporary Pacing — Nursing Management

Pacemaker Settings

Setting	Function	Typical Value
Rate	Pacing rate (bpm)	60–80 bpm
mA (Output)	Electrical current delivered; ensures capture	2–3× capture threshold
Sensitivity (mV)	Threshold for sensing native R waves	Start 2–5 mV; adjust as needed
Mode	Demand (VVI) or asynchronous (VOO)	Demand (VVI) default

Paced Rhythm Recognition

Pacemaker spike (vertical line) precedes each paced complex
Capture confirmed: spike followed by QRS (ventricle) or P wave (atrium)
Paced QRS is typically wide and bizarre (LBBB morphology for RV pacing)
In demand mode: native beats should inhibit pacing — no spike on native QRS

⚠️

Pacemaker-dependent patients: Never change settings without medical order; handle generator carefully; ensure battery check; have backup ready.

Troubleshooting Pacemaker Problems

Problem	ECG Finding	Cause	Action
Failure to Capture	Spike present but no QRS follows	Lead dislodgement, output too low, exit block, battery failure	Increase mA; check lead connections; reposition patient; notify doctor; check battery
Failure to Sense	Spikes on native beats (competition)	Sensitivity set too high (mV too high = less sensitive); lead fracture	Decrease mV setting (more sensitive); check lead; switch to asynchronous if emergency
Failure to Pace	No spikes when expected	Battery dead, generator fault, lead fracture, inhibition by interference	Replace battery; check connections; eliminate electromagnetic sources; change generator
Oversensing	Pacing inhibited by noise (T wave, muscle)	Sensitivity too low (mV too low = too sensitive); electromagnetic interference	Increase mV; remove interference sources; consider asynchronous mode

🔌 Permanent Pacemaker (PPM) & ICD

PPM Checks (Nursing)

Verify programmed rate on ECG (usually 60 ppm lower rate)
Check pacemaker ID card on admission
Document pacemaker manufacturer, model, implant date, programmed mode (e.g., DDD, VVI)
MRI conditional vs non-conditional: verify before any MRI
Avoid placing BP cuff on arm ipsilateral to subclavian lead
Annual/biannual device checks (remote monitoring in many GCC hospitals)

ICD — Appropriate vs Inappropriate Shocks

Type	Trigger	Action
Appropriate	VT/VF detected correctly	Post-shock 12-lead ECG; document; notify cardiologist; assess for haemodynamic stability
Inappropriate	AF/SVT/noise sensed as VT/VF	Notify cardiologist urgently; device reprogramming may be needed; do NOT deactivate magnet without doctor order

💥 Cardioversion vs Defibrillation

	Cardioversion (Synchronised)	Defibrillation (Unsynchronised)
Indication	AF, atrial flutter, SVT, stable VT with pulse	Pulseless VT, VF
Synchronisation	YES — shock delivered on R wave to avoid T wave (R-on-T)	NO — immediate shock regardless of cardiac cycle
Sedation	Required (conscious patient) — midazolam, propofol, or ketamine	Not required (patient unconscious/pulseless)
Energy (Biphasic)	AF: 100–200 J \| Flutter: 50–100 J \| SVT/VT: 50–150 J	First shock: 150–200 J; subsequent: 200–360 J (device-dependent)
Pre-procedure	Anticoagulation ≥3 weeks if AF >48 h (or TOE to exclude thrombus); consent; fasting	No preparation needed — emergency

🔴

Safety Checklist Before Any Shock: (1) "Stand clear — everyone off the patient" (2) Remove or move supplemental oxygen source ≥1 m away (3) Confirm all personnel not touching patient/bed (4) For synchronised: confirm sync marker on R wave before charging

AED — Guiding a Bystander

Turn on AED — follow voice prompts
Attach pads: right of sternum below clavicle; left lateral chest below armpit
Paediatric (<8 years / <25 kg): use paediatric pads; if unavailable, place one pad anteriorly, one on back (anterior-posterior)
Analyse: "Do not touch patient"
If shock advised: "Stand clear" → shock button → immediately resume CPR for 2 minutes
If no shock advised: immediately resume CPR

🚨 Critical Alarm Thresholds — GCC CCU

Heart Rate

<40 or >130

bpm — immediate response

QTc Interval

>500 ms

Torsades de Pointes risk

Lethal Rhythms

VT / VF / Complete Heart Block / Asystole

Immediate resuscitation action

⚗️ Electrolyte–Arrhythmia Connection

Potassium (K⁺)

Hypokalaemia (<3.5 mmol/L): AF, VT, U wave on ECG, prolonged QU interval, increased digoxin toxicity risk

Hyperkalaemia (>5.5 mmol/L): peaked T waves, wide QRS, sine wave pattern, VF, asystole

Target in CCU: K⁺ ≥4.0 mmol/L post-MI

Magnesium (Mg²⁺)

Hypomagnesaemia (<0.75 mmol/L): Refractory arrhythmias (resistant to treatment until Mg corrected); Torsades de Pointes; often co-exists with hypokalaemia

Treatment: MgSO₄ 2 g IV for Torsades; replace simultaneously with K⁺

Calcium (Ca²⁺)

Hypocalcaemia: Prolonged QT interval → Torsades risk; prolonged ST segment

Hypercalcaemia: Short QT interval, shortened ST; bradycardia; 1st/2nd degree block; can sensitise to digoxin toxicity

Action: Check ionised Ca²⁺; replace cautiously

💊 Drug-Induced Arrhythmias

AmiodaroneBradycardia (sinus node suppression); QT prolongation; thyroid dysfunction can exacerbate arrhythmias; monitor TFTs, LFTs, CXR
Digoxin ToxicityClassic: PAT with 2:1 block; bidirectional VT; AV nodal blocks; early signs: nausea, yellow/green visual halos; therapeutic range 0.5–2 ng/mL; K⁺ depletion potentiates toxicity
SotalolQT prolongation → Torsades; more pro-arrhythmic than other beta-blockers; dose-dependent QTc effect
Macrolide antibiotics (erythromycin, azithromycin)QT prolongation via hERG K⁺ channel blockade; significant concern in elderly and with polypharmacy
Antipsychotics (haloperidol, quetiapine)QT prolongation; risk increases with IV haloperidol; always check QTc before administration in CCU
Fluconazole / VoriconazoleQT prolongation; inhibit CYP3A4 increasing levels of co-administered QT-prolonging drugs
Cisplatin / CyclophosphamideCardiotoxicity; arrhythmias; electrolyte depletion (Mg, K) exacerbating risk
Tricyclic Antidepressants (TCA)Overdose: wide complex tachycardia, prolonged QRS and QT; treat QRS widening with sodium bicarbonate IV

📋 Documentation Standards — GCC Telemetry

Rhythm Strip Labelling Requirements

Date and time of print
Patient full name, MRN, date of birth
Ward / bed number
Lead(s) displayed
Nurse interpretation (rhythm, rate)
Action taken
Nurse signature and designation

When to Print a Rhythm Strip

Each nursing shift (per policy — typically 8–12 hourly)
Any new arrhythmia or rhythm change
Haemodynamic change (BP drop, altered consciousness)
Alarm triggered by rhythm change
After cardioversion / defibrillation
Pacemaker malfunction or threshold testing

DHA/DOH Telemetry Competency Requirements

ℹ️

Dubai Health Authority (DHA) and Department of Health (DOH) Abu Dhabi require basic cardiac monitoring competency for nurses working in CCU, step-down, and cardiac wards. This includes:

• Formal ECG/telemetry certification (hospital-based or external provider)
• Annual competency renewal
• ACLS/BLS currency
• Demonstrated rhythm recognition and response
• Documentation of in-service training hours

Telemetry Watcher Role (Central Monitoring)

Dedicated monitoring of multiple patients from central station
Immediate communication to bedside nurse for any critical alarm
Document all rhythm changes with time stamp
Cannot replace bedside nurse clinical assessment

🎯 Practice Quiz — 10 Scenario-Based Questions

Q1. A patient's ECG shows an irregularly irregular rhythm, no identifiable P waves, and narrow QRS complexes at a rate of 110 bpm. What is the MOST likely rhythm?

Q2. Your pacemaker-dependent patient has a pacemaker spike on the ECG but no QRS complex following it. What is this called and what is your FIRST action?

Q3. A patient's potassium is 2.9 mmol/L. Which arrhythmia is this patient at INCREASED risk of developing?

Q4. Before inserting a radial arterial line, the nurse performs an Allen's test. The patient's hand does not flush pink until 18 seconds after releasing the ulnar artery. What should the nurse do?

Q5. A conscious patient with known AF (onset 6 hours ago) develops chest pain and a BP of 75/40 mmHg. What is the MOST appropriate immediate intervention?

Q6. An ECG shows progressively lengthening PR intervals followed by a dropped QRS beat, then the pattern repeats. This is:

Q7. You note that an arterial line waveform appears blunted with a falsely low systolic reading. This is most consistent with:

Q8. A patient with a QTc of 520 ms is prescribed IV haloperidol for agitation. What should the nurse do?

Q9. During a defibrillation attempt, a team member says "I'll stay connected to the IV line — it's just a drip." What is your response?

Q10. A patient's monitor shows a wide-complex tachycardia at 180 bpm. The patient is conscious, BP 90/60 mmHg, and diaphoretic. What is the correct initial classification of this rhythm and your priority action?