Anesthesia Outside of the Operating Room Yujuan Li The Second Affiliated Hospital of Sun-yet Sen...

Anesthesia Outside of the Operating Room

Yujuan Li

The Second Affiliated Hospital of Sun-yet Sen University

Yujuan_04@yahoo.com.cn

Some terms

Nonoperating room anesthesia (NORA) Anesthesia at remote location Outpatient anesthesia Office-based anesthesia (OBA)

Importance

Number of NORA activities has increased rapidly( CT, MRI, neuroradiologic procedure or electroconvulsive therapy)

More Complex of the procedure, and situation and patients

Who does the sedation?

Mortality and Morbidity

Special problem of NORA

Limited working place, limited access to the patient,

Electrical interference with monitors and phones, lighting and temperature inadequacy,

Use outdated ,old equipment Less familiar with the management of

patients Lack of skilled personnel, drugs and supples

ASA guidelines for NORA patients

AAP guidelines for NORA pediatric patients

Anesthetic technique

General anesthesia: tracheal intubation or LMA best prevention of motion invasive, time and resource consuming, atelectasis

Sedation/anagesia: less invasive ,cost and time saving high rate of failure, high airway and respiratory

depression

No anesthesia

Conscious sedation versus monitored anesthesia care

Conscious sedation : a medically controlled state of depressed consciousness that allows protective reflexes to be maintained and retains the patient's ability to maintain a patent airway and to respond appropriately to

physical and verbal stimulation.

MAC: an anesthesiologist provide specific anesthesia services to particular patients with local or no anesthesia who undergoing a planned procedure.

Levels of sedation

Drugs for paediatric sedation

Discharge criteria

II. Contrast media

Allergic reaction History Symptoms: skin reactions, airway

obstruction, angioedema, and cardiovascular collapse.

Treatment: corticosteroids, H1 and H2 blockers. Oxygen, epinephrine, β2-agonists, and intubation , IV fluids

Prevention: corticosteroids

III. Anesthesia for CT

Less complex Use standard monitoring Less anesthetic time Higher levels of radiation exposure

IV. Anesthesia for MRI

A. Physical environment High magnetic field Need specialized compatible equipment Radiofrequency noise Metallic implants or implanted devices

Patients with implanted pacemakers, ICDs, or pulmonary artery catheters may

not have MRI scans.

B. Uncertain duration compatible Monitors anesthesia machines , ECG , pulse oximeters

, straight cables.

V. Anesthesia for neuroradiologic procedures

A. Endovascular embolization Indication: cerebral aneurysms, arteriovenous fistulas

and malformations , vascular tumors Methods: femoral artery puncture, a small catheter into

the aneurysm Anesthetic goals :stable hemodynamics, and rapid

recovery Other problem: Invasive arterial blood pressure

monitoring , avoid hypertension, monitor anticoagulation, complications include rupture of the aneurysm

B. Embolization for control of epistaxis and extracranial vascular lesions

C. Balloon test occlusion

D. Cerebral and spinal angiography

E. Vertebroplasty and kyphoplasty

F. Thrombolysis of acute stroke

G. Cerebral vasospasm

VI. Anesthesia for vascular, thoracic, and gastrointestinal/genito-urinary radiology procedures.

VII. Anesthesia for cyclotron therapy and radiation therapy

VIII. Electroconvulsive therapy (ECT) Objection: treat major depression, no responded to

medications, suicidal. Periods: 6 to 12 treatments over 2 to 4 weeks

Physiologic effects: a grand mal seizure tonic phase : 10 to 15 s, clonic phase :30 to 50 s. first reaction: bradycardia and hypotension following reaction: hypertension , tachycardia,5-10min ECG changes ICP, intraocular and intragastric pressure increase

Anesthetic goals

1. amnesia and rapid recover

2. Prevent damage

3. Control hemodynamic response.

4. Avoid interference with initiation and duration of induced seizure.

Contraindication :

absolute contraindication: intracranial hypertension

Relative contraindications: intracranial mass or aneurysm , recent myocardial infarction, angina, congestive heart failure, untreated glaucoma, major bone fractures, thrombophlebitis, pregnancy, and retinal detachment.

Anesthetic management

1. No Sedative premedication , Anticholinergic drugs and Ondansetron by individual.

2. Standard monitors (ECG, SPO2 , BP)

3. Induced with methohexital and succinylcholine or Mivacurium ventilated with 100% oxygen via mask and Ambu bag. labetalol or esmolol when necessary

4. Place rolled gauze pads

Anesthetic management

5. Electroencephalogram (EEG) monitor duration

6. Patients ventilated with O2

7. Some special attention : gastroesophageal reflux, severe cardiac dysfunction , intracranial mass lesions , pregnancy

8.Terminate seizure with propofol or enzodiazepines within 3 minutes

IX. Upper and lower endoscopy ,ERCP and PEG