68 Harley Street London, W1G 7HE · Main Office
Also at Cromwell & Syon Bishops Wood · Multiple Locations
0203 9838 001 Call for Appointments
jessica@oneheartclinic.com Rapid Response to Enquiries
Treatments & Procedures
Interventional Cardiology
at the Highest Level
Dr Nijjer offers the full spectrum of complex coronary interventional procedures — from precision diagnostics to high-risk intervention — delivered with world-class expertise at Harley Street and London's leading cardiac centres.
Clinical Excellence
A Complete Repertoire of Complex Intervention
Dr Nijjer is one of the UK's leading interventional cardiologists, combining decades of front-line clinical experience with a research portfolio that has shaped international treatment guidelines. Whether you need a diagnostic angiogram or a complex high-risk procedure — calcified arteries, compromised heart function, multi-vessel disease — you are in expert hands.
150+
Peer-Reviewed
Publications
Publications
20+
Years of Interventional
Expertise
Expertise
iFR
Technology — Invented
at Imperial College
at Imperial College
48h
Urgent Referral
Access Where Possible
Access Where Possible
Six Core Procedures
What We Offer
Diagnostic
Coronary Angiography
Mapping your heart's blood supply with precision
Coronary angiography is the gold standard for diagnosing blockages and narrowings in the coronary arteries. Using either a catheter passed through the wrist or a high-resolution CT scanner, Dr Nijjer creates a precise roadmap of the heart's circulation — guiding every subsequent treatment decision with objective, anatomical data.
SettingDay case · Catheter lab or CT suite
Duration30–60 minutes
AnaestheticLocal (catheter) or none (CT)
RecoverySame day discharge
Interventional
Angioplasty & Stenting
Restoring blood flow through blocked coronary arteries
Percutaneous coronary intervention (PCI) opens narrowed or blocked coronary arteries without open-heart surgery. Dr Nijjer is a high-volume operator with particular expertise in complex multi-vessel disease, bifurcation lesions, and left main stem intervention — among the most technically demanding procedures in cardiology — with outcomes guided throughout by physiology and intravascular imaging.
SettingCardiac catheter lab
Duration1–3 hours
AnaestheticLocal with sedation
RecoveryOvernight or day case
Diagnostic
Coronary Physiology
The science behind every stenting decision
Not every narrowing on an angiogram warrants a stent, and not every functionally significant lesion is visible to the naked eye. Coronary physiology uses pressure-wire measurements inside the artery to determine whether a narrowing genuinely limits blood flow to the heart muscle. Dr Nijjer worked in the team which invented the iFR technique, now used in tens of thousands of patients worldwide and embedded in European and American cardiology guidelines.
TechniquesiFR, FFR, RFR pressure wire
BenefitAvoids unnecessary stents
StatusESC & AHA guideline-recommended
SettingCombined with angiography
Imaging
Intravascular Imaging
Seeing inside the coronary artery in real time
Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) place a miniature imaging probe inside the coronary artery, providing high-resolution cross-sectional images far beyond what standard angiography can reveal. Dr Nijjer uses these techniques to characterise plaque composition, size vessels precisely, guide stent placement, and confirm optimal results — substantially reducing the risk of stent failure.
TechniquesIVUS & OCT
PurposePlaque characterisation, stent optimisation
BenefitBetter long-term stent outcomes
SettingCombined with PCI
Advanced Intervention
Calcium Modification
Unlocking severely calcified coronary arteries
Heavy calcium deposits make coronary arteries rigid and resistant to conventional stenting, leading to incomplete expansion and a higher risk of failure. Dr Nijjer specialises in the full range of calcium modification techniques — shockwave intravascular lithotripsy (IVL), rotational atherectomy, orbital atherectomy, and excimer laser. These complex procedures are often the only route to safe and durable revascularisation in high-risk patients.
ShockwaveIntravascular lithotripsy (IVL)
AtherectomyRotational & Orbital
LaserExcimer laser atherectomy
ComplexityHigh-risk patient expertise
Electrophysiology
Pacemaker Implantation
Restoring and regulating the heart's natural rhythm
A pacemaker is a small device implanted just beneath the collarbone that continuously monitors the heart's electrical activity and delivers precisely timed impulses when the heart beats too slowly or erratically. Dr Nijjer performs pacemaker implantation as a planned procedure with comprehensive pre-operative assessment and long-term device monitoring and follow-up under his direct care.
IndicationsBradycardia, heart block, sick sinus
Duration1–2 hours
AnaestheticLocal with sedation
Recovery1–2 days in hospital
What to Expect
Your Treatment Journey
From first consultation to long-term follow-up, every step is managed by Dr Nijjer and his team with continuity, clarity, and care.
1
Consultation
Full cardiology review, symptom assessment, and evaluation of any prior test results
2
Investigation
ECG, echocardiogram, CT angiography, stress testing, or ambulatory monitoring as needed
3
Planning
Detailed discussion of findings, treatment options, risks, benefits, and informed consent
4
Procedure
Day-case or overnight procedure performed by Dr Nijjer at a specialist London cardiac centre
5
Recovery
Post-procedure follow-up, medication optimisation, and ongoing cardiac monitoring under Dr Nijjer's care
Why Choose Dr Nijjer
A rare combination of pioneering research, technical mastery, and patient-centred care
Guideline-Shaping Research
Developer of the iFR pressure wire technique — now in international guidelines and used in patients worldwide. Principal Investigator of landmark randomised trials that have directly changed how cardiology is practised.
Cutting-Edge Technology
Full access to the latest interventional tools: shockwave lithotripsy, rotational and orbital atherectomy, excimer laser, OCT and IVUS imaging — enabling procedures that many centres cannot offer.
High-Volume Operator
Lead of the Cardiac Catheter Labs at Hammersmith Hospital — one of the busiest and most complex interventional programmes in Europe. In cardiology, procedural volume correlates directly with patient outcomes.
Continuity of Care
You see Dr Nijjer personally from first consultation through to post-procedure follow-up. Every clinical decision is made by him directly, and you always have access to his secretary Jessica for questions and concerns.
Ready to take the next step?
Book a Consultation Today
Whether you have been referred by your GP or wish to self-refer, Dr Nijjer's team responds promptly. Urgent cardiac cases are seen within 48 hours where possible.
Call us: 0203 983 8001 · jessica@oneheartclinic.com