The catchment builds the business case, not the city
Nagpur’s municipal population is the wrong number to plan a cath lab against. The right number is the catchment: the Vidarbha districts, plus the bordering belts of Madhya Pradesh and Chhattisgarh, funnel their complex cardiac work into one city, and patients travel 150-400 km to get here. That inflow is why a well-sited lab in Nagpur can be viable where the same lab in a comparable-sized city elsewhere would not be.
Two structural features reinforce it. Government cardiac capacity on the medical college campus, together with AIIMS Nagpur, has established the city as the place complex cardiac disease is sent — a referral pattern private programmes plug into rather than create. And a large share of the catchment presents under MJPJAY and Ayushman Bharat PM-JAY, which has put angioplasty within financial reach of populations that previously would not have travelled at all.
Evidence it properly: build the case on documented referral volume, on the proportion of chest-pain admissions your hospital currently transfers out, and on payer mix. That analysis also yields the workload figure in mA-minutes per week the shielding calculation needs, so none of it is wasted.
Siting the room against the emergency pathway
The referral geography has a design consequence most cath lab specifications ignore: where the room sits inside the building.
For elective angiography the route from ward to lab is a convenience question. For primary PCI in ST-elevation myocardial infarction it is a clinical one, and in a hospital receiving patients who have already lost hours travelling from Gondia, Chandrapur or across the state border, every avoidable minute inside your own building is a minute you control and they do not. A lab sharing a floor with the emergency department, or one held lift away from it, behaves differently from a lab reached through two corridors, a public lift lobby and a ward.
Three things follow into the layout brief. The lab and its recovery bays want a direct, controllable route from emergency, ideally on a priority lift of trolley size. Prep and recovery capacity — four to eight bays at 7-9 sq m with monitoring, oxygen and suction — should be planned as the throughput constraint it usually is, because recovery capacity caps daily case numbers more often than lab capacity does. And a programme intending 24-hour primary PCI has to treat the room, the technical room cooling and the UPS as continuously available services on essential power, not as a daytime elective facility.
Single-plane is the right answer for most Nagpur programmes
Worth stating plainly, because the opposite advice is easy to sell. Single-plane covers diagnostic coronary angiography, PCI including primary PCI, temporary and permanent pacing, IABP support and peripheral intervention — nearly the entire list of a general adult cardiac programme, and what most Nagpur hospitals are actually building for.
Biplane runs two independent gantries so one contrast injection yields two orthogonal views, decisive where contrast load and procedure time are limiting: neurointervention, paediatric and congenital cardiac work, complex structural heart cases. In Vidarbha that case mix genuinely exists, but it concentrates in a small number of institutions. For everyone else biplane roughly doubles the dominant capital line while taking room area from 40-55 sq m to 55-70 sq m and raising barrier area, electrical capacity and cooling demand — every one of those an infrastructure cost.
The more useful advice for a first lab is the corollary: a certified refurbished single-plane system with a low-hour tube and an OEM-backed service contract commissions a working lab at ₹1.75-3 crore all in, against ₹3.5-5.5 crore for a new mid-range installation. Nothing about that is second-rate. The shielding, power conditioning, cooling and regulatory file are built to the same standard either way.
Precision cooling is the Nagpur engineering problem
Panels, lead lining and doors behave the same in every climate. The plant does not.
Nagpur’s summer design dry bulb sits around 45-46°C, five to six degrees above what a package quoted from a Mumbai-Pune template quietly assumes. In a modular operation theatre that shows up as humidity drift. In a cath lab it shows up as an equipment fault, because imaging systems are far less tolerant of a temperature excursion than people are.
The technical room is where the risk concentrates. It rejects 5-15 kW continuously whether or not a case is running, and OEMs specify a narrow ambient band — commonly 18-25°C — with a hard limit at which the system throttles output or shuts down. A single cooling unit selected on a 40°C ambient is derated exactly when it is most loaded, and a compressor failure at 3 pm in May is not a comfort event; it is a cancelled list and a possible claim against the imaging warranty. The response is unremarkable and non-negotiable: design against 45-46°C, apply ambient derating to air-cooled condensers, site the condenser deck shaded and clear of its own discharge, provide N+1 redundancy with automatic changeover, and put all of it on essential power. Add temperature monitoring with an alarm that reaches someone, because the failure mode is silent until the system trips.
The procedure room is more conventional — 21-24°C at 40-60% RH with HEPA-filtered positive pressure — but Nagpur has two design points, not one. May is hot and dry; August is cooler and saturated. A unit sized only for the dry peak holds temperature in July and overshoots humidity, while low RH in the dry season raises static discharge risk around sensitive electronics. Adequate reheat and a controls sequence treating temperature and humidity as separate objectives is the fix. And because the shielded envelope is close to airtight, every duct crossing a lead barrier needs a baffled penetration drawn on the shielding layout rather than cut on site.
Power quality deserves real attention here
Cath lab load is spiky: modest continuous draw, with cine acquisition pulling momentary demand commonly specified in the order of 100-150 kVA. Size the supply for the peak and keep cable impedance from transformer to generator cabinet low enough to hold voltage regulation inside the OEM’s band during it — a dedicated feeder, generously sized cable, often a dedicated transformer. Under-engineered, the failure mode is not a dead machine; it is intermittent image-quality faults and exposure aborts nobody can reproduce and everybody blames on the imaging vendor.
Where incoming supply quality is variable — worth measuring rather than assuming — voltage stabilisation ahead of the isolation transformer belongs in the costing. DG sizing is the other item routinely got wrong: the set must carry the imaging peak plus technical room cooling plus UPS charging, not the lighting and monitoring load someone estimated from a ward. An online double-conversion UPS of roughly 20-60 kVA with 20-30 minutes autonomy bridges changeover; whether the imaging chain sits on it changes battery footprint and electrical room size, so settle that early. Underneath sit a low-impedance earth, equipotential bonding of the room, and isolated power with line isolation monitoring in the patient vicinity, consistent with the assumptions IEC 60601 makes about patient-connected equipment.
Shielding, AERB and statutory notes
Shielding design precedes civil work. Layout and barrier-by-barrier lead equivalence calculation first, AERB layout submission next, construction after — reversing that means opening finished walls to add lead. Barriers are calculated from workload, operating potential, distance, the occupancy factor of the space beyond and the shielding design goal for it, and because the primary beam is intercepted by the flat-panel detector, every barrier is a secondary barrier assessed against patient scatter. Most rooms land at 1.5-2 mm Pb, rising toward 2.5-3 mm where a barrier faces a fully occupied uncontrolled area at short distance.
AERB revises its procedures periodically, so treat the pathway structurally and confirm current requirements and fees on eLORA at the time. Typically: institution registration on eLORA, layout approval before construction, procurement of a type-approved system from a recognised supplier, nomination and approval of a Radiological Safety Officer, OEM installation and acceptance testing, then QA testing and a radiation survey at every barrier, door edge, window frame and console position, and finally the licence application. RSO certification runs on fixed examination cycles and commonly holds up a technically finished room, so start it at design stage. The licence is issued to the hospital, not the contractor; we prepare the layout, shielding calculations and documentation package and coordinate the survey, and we cannot guarantee an approval. Budget three to six months of regulatory lead time, concurrent with construction.
Alongside AERB, private facilities register with Nagpur Municipal Corporation under the state nursing homes framework while government and medical college projects route through the Directorate of Health Services with their own tender documentation. Fire clearance comes from Nagpur Fire and Emergency Services under the Maharashtra Fire Prevention and Life Safety Measures Act read with NBC 2016 Part 4. Cardiac packages under MJPJAY and PM-JAY carry their own infrastructure evidence requirements — a live design input in Vidarbha more than in most of Maharashtra.
Delivery from our Pune base
Nagpur is about 700 km from Pune and one of the best-connected freight destinations in the country, with the Samruddhi Mahamarg, NH-44 and NH-53 all passing through it. Lead sheet, panel sets, doors and the lead glass window travel in one to two loads, two to three days planned door to door, sequenced so the first items off the truck are the first installed. Surveys are booked in four to six working days. Specialist trades — lead lining, HVAC balancing, UPS commissioning, survey coordination — travel from Pune; general civil and erection labour is engaged locally, which is where the Vidarbha rate advantage comes from. Access varies sharply: greenfield sites around MIHAN and the outer ring have crane access and laydown space, while established hospitals in Dhantoli and the central corridor may offer only a service lift, in which case gantry and plinth dimensions are checked against the lift car at survey rather than on delivery day. Pune is our only office, and every Nagpur project runs from there.
Full technical specification
Barrier calculation method, room and technical-space sizing, the single-plane versus biplane versus hybrid comparison, full power, UPS and HVAC specification and the complete AERB sequence are set out on the cath lab setup service page. This page covers what changes when the room is in Nagpur.