ROLE OF ANESTHESIOLOGIST IN CARDIAC CATHETERIZATION

LABORATORY

Dr Abhijit Nair Dr Somita Christopher

Consultant Anesthesiologist,Care Hospital,Banjara Hills,Hyderabad.

Equipments:

Fluoroscope Procedure table Sterile table Wires, cables, stents, medicines Monitors Anesthesia workstation +/-

Space is always an issue as the lab is designed for the convenience of cardiologist and not the needs of Anesthesiologist

Claustrophobia for Anesthesiologist

One has to become familiar with the workspace and the personnel working there

Specialists encountered:

Cardiologist: Adult, Pediatric, Electro physiologist Gastroenterologist Interventional Radiologist Vascular Surgeon Neurosurgeon Interventional Pain specialist

Radiation hazards: Ionizing radiation in CCL Increased exposure due to: Configuration of equipment Number of cases per day Duration of screening Modes of radiation generation: Fluoroscopy Cine angiography DSA

Fluoro: Used for catheter placement 95% of X ray operation time 40% of total radiation exposure Cine: For acquiring diagnostic images To generate permanent record of procedure 5% of X ray operation time 60% of total radiation exposure Radiation dose is directly related to cine frame

rate

It is important to measure radiation doses acquired by cath lab personnel

Exact doses difficult to derive due to: Non uniformity of radiation, Differences in X ray intensity Low energy generated by modern devices

Unit of absorbed radiation : Grey( Gy) Absorbed dose of radiation is expressed as “ EFFECTIVE DOSE” ED is expressed in Sievert units ( SI unit) rem ( roengten equivalent in man/mammal) : Non SI measure of ED 1 Sv = 100 rem 1 Gray unit = 0.75 Sv 1 Sv = 1000 mSv

ED: Measure of whole body radiation from local radiation source

ICRP ( International Commission on Radiation Protection) recommends use of effective dose to evaluate the effects of partial exposure and relate this to the risk of equivalent whole body exposure

The radiation is associated with a small but definite risk of inducing a malignant disease

Low-dose radiation exposure has also been shown to induce an increase in the number of circulating lymphocytes and chromosome aberrations, which represent surrogate biomarkers of cancer risk

Venneri L, Rossi F, Botto N et al.: Cancer risk from professional exposure in staff working in cardiac catheterization laboratory: insights from the National Research Council's Biological Effects of Ionizising Radiation VII Report. Am. Heart J. 157, 118–124 (2009)

Symptoms of acute radiation:

0-0.25 Sv : None 0.25-1 Sv : Nausea, loss of appetite, bone

marrow, LN 1-3 Sv : Bone marrow, LN, Spleen, severe

nausea 3-6 Sv : Infection, diarrhoea, sterility, skin

peeling 6-10 Sv : Above + CNS impairment > 20 Sv : Death

Organs involved: Skin: 1 minute screening- 20 mGy skin dose Threshold for shin erythema- 2 Gy

Eye: Conjunctiva, iris, sclera, retinal vessels Lens:- critical Damage irreversible Radiation induced cataracts are distinct from naturally occuring cataract as they form in posterior surface

E Vano etall,Eye lens exposure to radiation in interventional suites- Caution is required.Radiology: Volume 248: Number 3

—September 2008

Carcinogenesis: Brain, skin, Thyroid Gonads : Lower risk of malignancy Prolonged exposure leads to infertility

Methods of reducing radiation exposure:

Decrease exposure tome Distance Barriers: Shields, thyroid collar, leaded gloves Apron - 0.25 mm Pb equivalent Gloves - 0.35 mm Pb equivalent 18% of active bone marrow is exposed to

effects of radiation even with proper lead apparel

Dosimeter: Body dosimeter Ring dosimeter

Classified as: Single badging Double badging Fetal dosimeter

Dosimeter is a must for people working in CCL, to track cumulative radiation exposure

Occupational limit of radiation exposure in UK : 20 mSv/year averaged over 5 consecutive years

Katz etall ( 2005 ): Radiation exposure to anesthesia department had doubled after the introduction of EPL

Professional Certificate in Radiation

Safety!

PAC: Co- morbidities Optimization ( if time permits) List of medications, interactions Airway Note necessary labs Highlight renal function Explain procedure ( Duration, areas of

puncture, prolonged supine position, disturbing discussions, AC etc)

Anesthesia medications: Thiopentone Propofol Benzodiazepines Opioids NMDA receptor antagonist Dexmedetomidine Inhalational

Anesthesia considerations:

PCI/CAG: Sedation by Cardiologist Special considerations: Respiratory insufficiency Anticipated catastrophies- LMCA lesions, tight

lesions, multiple/ critical lesions, bad LV Primary PTCA VIP Close communication with Cardiologist Prefer ETT over LMA

Percutaneous VAD/ IABP:

In hemodynamically compromised patients- Cardiogenic shock

May require ETT ( solves the problem) Co-ordinate inotropes/vasopressors Inform ICCU/OT

Catheter Ablations:

RFA for AVNRT, AF, Afl, accessory pathways, VT CARTO Prolonged procedures, cold fluids for irrigation Insist on Foleys Several punctures: Groins B/L, Neck B/L, Sternum ( pericardial mapping) Sedation: Boluses ( have to sit there), infusion ( can be mobile), ETT when nothings working

CARTO:

CRTD/ CRTP/ ICD: Sick patients, can’t lie supine Multiple problems: Geriatric, Bad LV, Several medications, Renal dysfunction, redo procedures Elective NIV Mild- moderate sedation Avoid Propofol Insist on ABP/ arrange NIBP ETT when airway management is getting

difficult

Copyright ©2003 American Heart Association

Shea, J. B. et al. Circulation 2003;108:e64-e66

Schematic representation of CRT pacemaker showing 3 leads in the heart

Pediatric Cardiology: Sedation: ASD/VSD device closure, Cath study,

PDA device/coil closure GA: PBAV, PBPV, PBMV, PDA stenting, Caths ( especially post ICR patients) Post procedure ventilation: PDA stenting, procedural complication GA vs sedation: for ASD/VSD debatable, due to the use of TEE

Gastroenterology: ERCP, esophageal stenting: Mild- moderate sedation

Vascular surgery: Angioplasty: LA +/- MAC EVAR: Anesthesia management: LA, GA ( LMA, ETT), Regional ( SAB, Epidural, CSE ) There is no evidence to suggest that outcome

is better/ worse with any of the type of anesthesia management

Interventional radiology: Sedation GA with ETT wherever indicated ( Liver RFA, Carotid body tumor)

Neurosurgery: Angio: LA +/- MAC Aneurysm coiling: GA with ETT

Guglielmi detachable coils ( GDC ):GAProlonged procedureVentilation post procedure ? Vasospasm!HHH therapy

Interventional pain procedures:

MAC

Hybrid theatre complex: