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ANAESTHESIA

ANAESTHESIA. DR. SHAH SUDHIRCHANDRA M.D., D.A.(ANAESTHESIA). ANAESTHESIA. 1. General Anaesthesia (G.A.) 2. Regional Anaesthesia (R.A.). GENERAL ANAESTHESIA. Reversible loss of consciousness accompanied by analgesia, hypnosis and loss of reflexes with or without muscle relaxation

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ANAESTHESIA

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  1. ANAESTHESIA DR. SHAH SUDHIRCHANDRA M.D., D.A.(ANAESTHESIA)

  2. ANAESTHESIA 1. General Anaesthesia (G.A.) 2. Regional Anaesthesia (R.A.)

  3. GENERAL ANAESTHESIA Reversible loss of consciousness accompanied by analgesia, hypnosis and loss of reflexes with or without muscle relaxation 1. Spontaneous breathing 2. Controlled ventilation

  4. REGIONAL ANAESTHESIA Only a part of the body is anaesthetised Types 1. Central blocks 2. Peripheral blocks

  5. CENTRAL BLOCK 1. Spinal Analgesia 2. Epidural Analgesia 3. Caudal Analgesia

  6. ANATOMY VERTEBRAL COLUMN Spinal cord is protected by vertebral column 33 vertebrae 4 spinal curves

  7. ANATOMY SPINAL CORD Spinal cord is covered by 3 membranes 1. Pia 2. Arachnoid 3. Dura

  8. PERIPHERAL BLOCKS 1. Surface anaesthsia – EMLA cream 2. Infiltration block – subcut. tissue 3. Nerve blocks 4. Field block - Inguinal field block

  9. NERVE BLOCKS 1. Upper extremity blocks A Supraclavicular block B Axillary block C Elbow block D Wrist block E Digital block

  10. NERVE BLOCKS 2. Lower extremity blocks • A. Sciatic nerve block • B. Femoral nerve block • C. Popliteal block • D. Ankle block • E. Digital nerve block

  11. NERVE BLOCKS • 3. Peribulbar block – eye operations Cataract surgery • 4. Penile block – circumcision • 5. Dental block – tooth extraction

  12. PREOPERATIVE CHECKUP History • Previous operation • Diseases Hypertension, diabetes, asthma and heart diseases • Medications • Allergy

  13. PREOPERATIVE CHECKUP • General examination Pulse, B/P, colour and temp. • Systemic exam CVS and Resp. system exam. • Investigations Hb, electrolytes, ECG and x ray chest • American Society of Anaesthesiologist (ASA) grading of patient for risk of anaesthesia (1 to 6) • Patient information about type of anaesthesia and its complications • Consent

  14. PREMEDICATION Premedication • Pethidine 1 mg/kg I.M. • Maxalon 0.2 mg/kg I.M. • Syrup vellargan 3 mg/kg orally • Ranitidine ( Zantac) 150 mg orally • Diazepam 5 to 10 mg at night on previous day

  15. General anaesthesia Cannulation • 22 to 24 G cannula in children • 20 to 18 G cannula for adult I/V fluids • 5% D/S or hartman soln. • Gelafusin soln. • Blood

  16. GENERAL ANAESTHESIA • Preoxygenation for 3 min. Induction • Fentanyl 1 mcg/kg • Propofol 2 to 3 mg/kg Soya bean and egg phosphide solvent Intubation • Tracrium 0.5 mg/kg muscle relaxant or • Scoline 2 mg/kg for emergency cases as rapid onset of action

  17. GENRAL ANAESTHSIA • Intubation with endotracheal tube or L.M.A. inserted or holding face mask • E.T tube Size 8 to 8.5 mm for men Size 7 to 7.5 mm for female Children Age/4 + 4 mm

  18. INTUBATION

  19. LARYNGEAL MASK • L.M.A. size 4 for men • L.M.A. size 3 for female • L.M.A. size 1, 1.5, 2, 2.5 for children Insertion technique

  20. Advantages of lma 1. Supraglottic device - no irritation of larynx 2. Easy to insert 3. Laryngoscope is not necessary – blind intubation 4. Awake insertion possible 5. Life saving for difficult intubation 6. E.T tube can be passed through LMA 7. Tolerated at lighter plane of anaesthesia

  21. MAINTENANCE • O2 (40%) + N2O (60%) + Isoflurane (1%) • Spontaneous breathing or controlled ventilation • Tracrium and Fentanyl are repeated every 30 min. • Continuous monitoring

  22. monitoring Continuous monitoring • 1. Electrocardiogram (E.C.G.) • 2. SPO2 Saturation of Hb – normal 97% • 3. End tidal CO2 • 4. Blood pressure Systolic, diastolic and mean pressure every 5 min. • 5. Temperature - warming matress

  23. reversal • Reversal of relaxant drug Tracrium at the end of operation • N2O and Isoflurane are stopped • Only O2 given to the patient • Neostigmine 2.5 mg + atropine 1 mg • Oral suction • Extubation only when patient conscious and coughing • O2 by face mask • Monitoring of vital signs • Shifted to recovery room when vital signs are stable

  24. RECOVERY • O2 by face mask • Monitoring SPO2, B/P and ECG • Warming blanket • Treat any complications • Nausea/ vomiting – maxalon or zofran • Adequate pain relief • I/V Fentanyl or I/M Pethidine • Aldrete scoring system • Shifted to ward when vital signs are stable

  25. SPINAL ANALGESIA • Local anaesthetics • Lignocaine 1% 2 ml for L.A. at L2-3 interspace • Marcaine (Bupivacaine) 0.5% 2to 2.5 ml with fentanyl 25 mcg Autonomic, sensory and motor nerve block upto T6-8 level Duration 3 to 4 hours

  26. SPINAL ANALGESIA • Spinal needle – 25 G pencil point needle • Spinal cord 45 cm long • 3 covering membranes • Dura, arachnoid and pia membranes • Cerebro spinal fluid (C.S.F.) is in subarachnoid space

  27. Spinal analgesia Complications • 1. Hypotension Fluids, ephedrine 6 mg • 2. Shivering Warming blanket, Pethidine 25 mg, O2 • 3. Nausea, vomiting Maxalon, Zofran • 4. Respiratory depression

  28. Spinal analgesia • 5. Headache – C.S.F. loss • 6. Backache

  29. Anatomy of epidural space

  30. EPIDURAL ANALGESIA

  31. EPIDURAL ANALGESIA • 18-16 G Touhy needle inserted into epidural space at any level depending on site or operation • Catheter is inserted thro’ the needle upto 8 to 9 cm at skin level • Needle is removed and catheter is fixed to the back of the patinet

  32. Epidural- Catheter

  33. EPIDURAL ANALGESIA Complications • 1. Total spinal • 2. Hypotension • 3. Nausea and vomiting • 4. Patchy analgesia • 5. Headache • 6. Epidural abcess • 7. Backache

  34. CAUDAL BLOCK • 21 G needle is inserted into thro’ sacral haitus • 15 TO 20 ml .25% marcaine injected • Lower abdominal surgery • Children for postop pain relief Herniotomy, circumcision

  35. EMERGENCY DRUGS • 1. Atropine Bradycardia pulse less than 50/min • 2. Adrenaline Cardiac arrest, allergy • 3. Ephedrine 6 to 9 mg low blood pressure • 4. Labetolol 3 to 5 mg Low blood pressure

  36. EMERGENCY DRUGS • 5. Hydrallazine High blood pressure • 6. Piriton 10 mg Allergy • 7. Dopamine, dobutamine To increase blood pressure and cardiac output • 8. Hydrocortisone Allergy

  37. EMERGENCY DRUGS • 9. Narcan To reverse overdose of narcotics • 10. Maxalon 10 mg Nausea and vomiting • 11. Zofran Nausea and vomiting

  38. SUMMARY • 1. General and regional anaesthesia • 2. Selection of patient for anesthesia is very important • 2. Monitoring and safe anesthesia are vital throughout anesthesia • 4. Adequate recovery of patient before sending to ward

  39. Any q???

  40. THANK YOU THANK YOU

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