Presentation on theme: " Surgical Positioning Jeffrey Groom PhD, CRNA Nurse Anesthetist Program Florida International University."— Presentation transcript:
1 Surgical PositioningJeffrey Groom PhD, CRNA Nurse Anesthetist Program Florida International University
2 SURGICAL POSITIONING OBJECTIVES Identify the role and responsibility of the anesthesia provider in patient positioning.Describe the complications associated with improper patient positioning.Describe the physiological changes that occur with the various positions.Identify scenarios involving medicolegal liability associated with improper patient positioning.
14 Surgical Positioning All positioning schemes have 3 goals: Surgical PositioningAll positioning schemes have 3 goals:1. Maximum exposure to the surgical area while maintaining homeostasis and preventing injury2. Position must provide the Anesthetist with adequate access to the patient for airway management, ventilation, medications, and monitoring3. Promote the enhancement of a satisfactory surgical result
15 What happens when the anesthetized patient can’t care for themselves? Surgical PositioningWhat happens when the anesthetized patient can’t care for themselves?How is it specified in hospital policy?
16 Surgical PositioningWhen you sleep, you reposition yourself to prevent pressure ischemia. Under anesthesia, the patient does not reposition (protect) them self so the responsibility falls to the surgical team to prevent pressure ischemia & positioning injuries.
17 Why is there a risk for injury ? Surgical PositioningWhy is there a risk for injury ?Positioning and AnesthesiaBlunted or obtunded reflexes prevent patients from repositioning themselves for relief of discomfortAnesthesia may blunt compensatory sympathetic nervous system reflexes that would minimize systemic BP changes with abrupt position changesRendering patients unconscious and relaxed may permit placement in position they may not have normally tolerated in an awake state
18 Patient Injury and Surgical Positioning Most are nerve injuries due to overstretching and/or compression.90% undergo complete recovery.10% are left with residual weakness or sensory loss.Many injuries can produce lasting disability.Many injuries lead to litigation.General anesthesia removes many of the bodies natural protective mechanisms.Recognition of risks and prevention is essential.
19 How do nerves get injured? Example How do nerves get injured? Example
21 Peripheral Nerves from Spinal Cord only sensory fibers run in the dorsal rootmotor fibers (somatic and autonomic) leave the cord via the ventral rootssympathetic fibers leave the cord via ventral roots from T1 - L2
23 Preoperative History and Physical Assessment Preexisting patient attributes associated with increased incidence of perioperative neuropathies:extremes of age or body weight,preexisting neurologic symptoms,diabetes mellitus,peripheral vascular disease,alcohol dependency,smoking,and arthritis.
24 Surgical Positioning ASA Closed Claims claims for anesthesia-related nerve injuries#1 - Ulnar nerve (28%)#2 - Brachial plexus (20%)#3 - Common peroneal (13%)ASA closed claims database is a standardized collection of case summaries derived from the closed claims files of professional liability insurance companies.
25 Surgical Positioning Ulnar nerve injury Caused by arms along side patient in pronationUlnar nerve compressed at elbow between table and medial epicondyle.Prevented by positioning arms in supination.Hypotension and hypoperfuison increase risk.
28 Brachial Plexus Injury Surgical PositioningBrachial Plexus InjuryExcessive arm abduction or external rotation.Prevented by avoiding more than 90o abduction.Secure arm to prevent arm from falling off of table or arm board.
30 Surgical Positioning Brachial Plexus Abduct arms to no more than 90 degrees.Minimize simultaneous abduction, external arm rotation, and opposite lateral head rotation.In prone position, maintain abduction and anterior flexion of arms above head to no more than 90 degrees.In lateral position, place chest roll under lateral thorax to minimize compression of humerus into axilla.
32 Surgical PositioningPeroneal nerveCaused by direct pressure on the nerve with the legs in lithotomy position.Nerve compressed against neck of fibula.Prevented by adequate padding of lithotomy poles.
37 Surgical Positioning Supine Most frequently used position.Cervical, thoracic, lumbar vertebrae should be in a straight, horizontal line.Minimal effects on circulation.FRC decreases 25-30% from upright.Arm boards and arm must be less than 90o abduction angle to the torso.Place a small pillow or soft pad under small of back or under knees to maintain normal lumbar curvature
38 Surgical Positioning Supine (con't) Arms at greater than 90o angle results in stretch of the subclavian and axillary vessels resulting in radial pulse obliteration and arterial thrombosis.Injuries have been reported with as little as 60o abduction.Palms up- relieves pressure on the ulnar nerve as it passes through the humeral notch at the elbow.Soft padding under the elbowAvoid tight wristlets
39 Surgical Positioning Supine Ulnar nerve injuryHypotension and hypoperfusion increase riskInability to abduct or oppose the 5th fingerAtrophy of the intrinsic muscles of the hand (claw hand).
40 Surgical Positioning Supine Extreme rotation of the head can cause occlusion and thrombosis of the vertebral artery.Pressure from a mask or head strap can cause injuries of the supraorbital and facial nerves.Relaxation of the paraspinous muscles and flattening of the normal lumbar convexity results in tension on the interlumbar and lumbosacral ligaments causing a backache.Use a soft pad or a donut to stabilize the head and occiput.
41 Surgical Positioning Supine Use a soft pad or a donut to stabilize the head and occiput.
42 Surgical Positioning Prone Use a soft pad or a donut to stabilize the head and occiput.
43 Surgical Positioning Prone Induction completed on stretcher, then patient logrolled to OR table under command of CRNABody ‘logrolled’ as a unit in a smooth, slow, and gentle manner.Neck in alignment with spinal column.Eyes and ears protected and not depressed.Chest rolls, or bolsters are placed lengthwise on both sides of the thorax, extending from the acromioclavicular joints to iliac crest-adequate lung expansion and diaphragm excursion.
44 Surgical Positioning Prone Protect female breasts & male genitalia.Pillow under legs & ankles to flex knees and prevent pressure on toes and plantar flexion of feet.Arms at side or extended alongside the head on arm boardsDocumentation: pressure points padded, free abdominal and chest expansion, position of the arms, eye care
45 Surgical Positioning Prone CardiacPooling of blood in extremitiesCompression of abdominal musclesDecrease preload, c.o., and blood pressureIncreased SVR and PVRDecreased stroke volume and cardiac indexTEDS or pneumatic sequential compression stockings to minimize pooling of bloodDiaphragm pushed cephaladAnterior chest expansionV/Q mismatches
46 Surgical Positioning Prone RespiratoryDecreased lung complianceIncreased work of breathingThoracic Outlet Syndrome-secondary to thoracic nerve compression (agonizing, debilitating, and unremitting pain post-operatively following overhead arm placementETT dislodgement - ExtubationTOS- compression of the brachial plexus and subclavian vessels near the first rib
48 Surgical Positioning Trendelenburg CardiacActivation of baroreceptorsDecrease in C.O., PVR, HR, and BPDoes not improve C.O. in hypotension & hypovolemiaRespiratoryDecreased FRC, total lung capacity and pulmonary compliance secondary to shift of abdominal visceraIncreased V/Q mismatchingAtlectasisIncreased likelihood of regurgitationUse of shoulder braces to prevent cephalad mvmt
49 Surgical Positioning Reverse Trendelenburg CardiacDecrease in c.o., preload, and arterial pressureBaroreflexes increase sympathetic tone, HR , PVR.RespiratoryWork of breathing decreasedIncrease in FRC
51 Surgical Positioning Lateral Decubitus Usually positioned with bean bag or position supports.Head must be aligned to support the spinal column and prevent compression of dependent arm.Pillows placed between legs and feetBottom leg flexed to provide stability and facilitate venous drainage.Peroneal nerve susceptible to injuryLeaves the posterior aspect of the knee and wraps around the head of the fibula
52 Surgical Positioning Lateral Decubitus Presents anesthetic challenges-Compression of vena cava with kidney restDependent lung is underventilated-pressure of abdominal contents and wt of mediastinum.Nondependent lung is overventilated because of increased compliance.Blood flows to underventilated lung by gravity.V/Q mismatch may manifest as hypoxemia
53 Surgical Positioning Lateral Decubitus Kidney rest- beneath the bony iliac crest, not under fleshy waist areaAxillary rolls- placed at scapula near the axillary space to relieve pressure on the arm and foster adequate chest excursion.Dependent shoulder, axilla, and deltoid must be padded.Lower arm brought forward to prevent pressure on brachial plexus.Chest surgery- upper arm flexed at elbow and raised above head to elevate scaplua and widen intercostal spaces.
54 Surgical Positioning Lateral Decubitus CardiacOutput unchanged unless venous return obstructed (kidney rest).May see decrease in arterial blood pressure as a result of decreased vascular resistance (R > L).RespiratoryDecreased volume and increased perfusion of dependant lung, V/Q mismatch potential
56 Surgical Positioning Sitting CardiacPooling blood in lower body decreases central blood volume.ABP fall despite increase in HR & SVR. (30%)C.O. decreases 20-40%Increase in sympathetic /parasympathetic toneIntrathoracic blood volume decreases as much as 500 mlRespiratoryLung volumes are increased.FRC is increased.Work of breathing is decreased.
57 Surgical Positioning Sitting Posterior Foss Craniotomy & shoulder procedures.Full sitting position is uncommon.Lounge chair, beach chair.Facilitates venous drainage.Venous air embolism risk is potential hazard
58 Surgical Positioning Sitting ComplicationsPostural hypotensionAir emboliPotentially lethalChances increase with degree of elevation of op site.Dx: change in heart rate, murmur, decreased in exp CO2, cardiac dysrythmias, change in heart sounds generated by a parasternal Dopppler.TEE most sensitive for detection (0.015 ml/kg/air)Gasp breath may be first indicatorDecreased Pa02, etCO2, increased etN
59 Surgical Positioning Sitting ComplicationsOcular compressionPneumocephalusEdema of face, head, and neck due to prolonged neck flexion resulting in venous and lymphatic obstruction.Sciatic nerve injuryBended knees without flexion of the hipsFoot drop is clinical manifestation
61 Surgical Positioning Lithotomy Cephalad displacement of the diaphragm.Principle hazards:Common peroneal- foot dropFemoral- decreased or absent knee jerkSaphenous-Obturator-inability to adduct leg & diminished sensation over medial side of the thighSciatic nerve- weakness of all skeletal muscles below the kneeBoth legs should be elevated & flexed at same time to avoid stretching of peripheral nervesThighs should be no more than 90oCP is branch of sciatic nerve
62 AANA Scope and Standards for Nurse Anesthesia Practice Standard V Nurse anesthetists should “monitor and assess patient positioning and protective measures at frequent intervals.”Failure to follow professional standards and guidelines may result in positioning injuries and liability.
63 Pommier vs Savoy Memorial Hospital LIABILITY EXAMPLESPommier vs Savoy Memorial Hospital55 y.o female w/fractured hip2hr 20 min surgeryDeveloped peroneal palsy post-opPlaintiff unaware of what actually happened during operation and no direct evidence of negligence, but she didn’t have the injury prior to surgical procedure. If injury occurs you assume negligence.Warning for crna’s to understand their responsibility for padding and positioning the patient and thoroughly documenting that the pt had been carefully positioned, padded, and monitored.Not a common injury for ortho procedures LAImproper documentation re: paddingHospital policy- entire OR team responsibleProtective and monitoring measures were not taken nor documented. No prior injury present. Conclusion at trial – injury would not have occurred had there not been negligence – res ipsa loquitur.
64 Shahine vs. Louisiana State University Medical Center, 680 So Shahine vs. Louisiana State University Medical Center, 680 So. 2d 1352 (La. App., 1996)"#6 table with safety strap in place 2" above knees - supine with bean bag underneath patient post induction & catheter insertion into the left side, with right side up, per __M.D. & __M.D, - auxiliary roll in place (1000cc bag IV fluid wrapped in muslin cover) - held in place per surgeons until bean bag deflated with suction - pillow placed under right leg with left leg bent slightly - U drape in place per surgeons pre prep - left arm extended on padded arm board - right arm placed on mayo tray that is padded."Protective and monitoring measures were taken and documented. Brachial plexus injury reported postop. No prior injury present. Conclusion at trial – injury was a risk of the procedure however personnel took precautions according to standards and were not negligent.
65 ASA Practice Advisory – Sets a legal standard of care LINK to Advisory in the Course Outline Page
66 Upper extremity positioning Arm abduction should be limited to 90° in supine patients; patients who are positioned prone may tolerate arm abduction greater than 90°Arms should be positioned to decrease pressure on the postcondylar groove of the humerus (ulnar groove).When arms are tucked at the side, a neutral forearm position is recommended. When arms are abducted on armboards, either supination or a neutral forearm position is acceptableProlonged pressure on the radial nerve in the spiral groove of the humerus should be avoidedExtension of the elbow beyond a comfortable range may stretch the median nerve
67 Lower extremity positioning Lithotomy positions that stretch the hamstring muscle group beyond a comfortable range may stretch the sciatic nerveProlonged pressure on the peroneal nerve at the fibular head should be avoidedNeither extension nor flexion of the hip within normal range of motion increases the risk of femoral neuropathy
68 Protective paddingPadded armboards may decrease the risk of upper extremity neuropathyThe use of chest rolls in laterally positioned patients may decrease the risk of upper extremity neuropathiesPadding at the elbow and at the fibular head may decrease the risk of upper and lower extremity neuropathies, respectivelyEquipmentProperly functioning automated blood pressure cuffs on the upper arms do not affect the risk of upper extremity neuropathiesShoulder braces in steep head-down positions may increase the risk of brachial plexus neuropathies
69 Postoperative assessment A simple postoperative assessment of extremity nerve function may lead to early recognition of peripheral neuropathiesDocumentationCharting specific positioning actions during the care of patients may result in improvements of care by (1) helping practitioners focus attention on relevant aspects of patient positioning; (2) providing information that continuous improvement processes can use to lead to refinements in patient care; and (3) provide medicolegal defense
71 Positioning Checklist Head, neck and cervical spine supported in a straight line.Scalp, head, and face protected from tight anesthesia mask/straps.Ears protected from traumatic pressure/objects.Chest and torso kept in physiological position for adequate full, bilateral respiratory exchange and expansion.Breasts & genitalia protected from excessive pressure.
72 6. Arms in physiological position and supported 6. Arms in physiological position and supported. - not to exceed 90 degree extension at shoulder - in flexion not hyperextension - upper arm not hanging over edge of table or rubbing on metal part of table - elbow area protected from ulnar pressure - hands free of pressure and compression - fingers in slight flexion or neutral extension - wrist restraints loose or padded - palms up on armboard - palms towards body when arms at side
73 Positioning Checklist Genitals free of trauma, pressure, or rubbing.Back in physiological position, spine in straight line- slight sacral curvature- soft small positioning devices under sacral area and knees to relievepressure, pain, or stretching.Thighs/legs in straight line of flexed position; no pressure to iliac crests, greater trochanters, area bt back & knees, peroneal nerve on lateral aspects of knees, or to patellas.Heels/ankles/toes free of pressure or rubbing trauma.Safety belt placed snugly over patient w/blanket or towel between strap and patient’s body to prevent maceration.Other straps or positioning devices placed only over padded body parts.
74 Surgical PositioningDuring clinical this semester – spend time after cases learning the operation of the OR table and proper positioning. Practice on each other to appreciate “positioning” from patient’s perspective.