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MONITORIA DE LA RELAJACION
NEUROMUSCULAR
NANCY TATIANA RODRIGUEZ BETANCOURTESTUDIANTE NIVEL I
ANESTESIOLOGIA Y REANIMACIONU DE C
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SUBJETIV
A
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Sensitivity Specificity
Positive predictive
value
Negative predictive
valueInability to smile 0.29 0.80 0.47 0.64
Inability to swallow 0.21 0.85 0.47 0.63
Inability to speak 0.29 0.80 0.47 0.64
General weakness 0.35 0.78 0.51 0.66
Inability to lift head for 5 s 0.19 0.88 0.51 0.64
Inability to lift leg for 5 s 0.25 0.84 0.50 0.64
Inability to sustained hand grip for 5 s
0.18 0.89 0.51 0.63
Inability to perform sustained tongue depressor test
0.22 0.88 0.52 0.64
Diagnostic Attributes of the Clinical Tests: Sensitivity, Specificity, Positive and Negative Predictive Values of an Individual Clinical Test for a Train-of-Four <90%
Sorin J. Brull, MD, Glenn S. Murphy. Residual Neuromuscular Block: Lessons Unlearned. Part II: Methods to Reduce the Risk of Residual Weakness. A & A July 2010 vol. 111 no. 1 129-140
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OBJETIVA
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Fibra = todo o nada
Músculo = sumatoria de fibras
Estímulo supramáximo 20-25% (dolor)
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ESTIMULACIÓN ÚNICA
Fcia >0,15 hz disminuye el nivel de la rta evocada para ser supramaximo. No comparables.
DESPOLARIZANTES: fcia + alta, no desvanecimiento
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TRAIN OF FOURALI 70´S
Estímulos supramaximos cada 0,5 seg (2.0hz)
Repetir: 12-15 seg
• control• Bloqueo parcial• radio TOF• fase II
• Tof 0,7 rta a estímulo único
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ESTIMULACIÓN TETÁNICA>30hz 50HZ 5 SEG >1-2´
50-100-200 HZ 1 SEG
NORMAL Y BNMD SOSTENIDO
BNMND Y FASE II NO SOSTENIDO
Liberación de acetilcolina (presináptico) equilibrio liberación/producción “márgen de seguridad” Receptores bloqueados = desvanecimiento“facilitación”: 60 seg PTC
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CONTEO POSTETANICO
3 SEG
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Figure 39-5 Relationship between the post-tetanic count (PTC) and time when onset of train-of-four (T1 )
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Eliminar movimientos indeseados (oftalmo)
Fcia> 6min
Carina
Severa: <2-3rtasTotal: leves + severas
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DOBLE RÁFAGA• 50Hz• 750msec• 2 ráfagas de
3 impulsos• + sensible
visual/tactil
DBS3,3 ratio: 2da/1ra
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EVALUACIÓN SUBJETIVA: DBS > TOFNINGUNO 100%
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ESTIMULADOR:longitud pulso: 0,2-
0,3msec (>0,5=mm)
corriente constante 60-70mA (25-50
resistencia <2,5kΩ; frío 5kΩ
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Área conducción 7-11 mmLimpiar abrasivo
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• Hipotenar: ulnar flexor y aductor del 5to. Discrepancia tof 15-20%
• Corrugado superciliar: >20-30 mA• Tibial posterior flexor hallux• Peroneo dorsiflexión
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1 cm
3-6 cm
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Dosis – rta: Bajas: 1ro laringeos
Bloqueo 100% aductor: 1ro aductor
Bloqueo 100% laringeos: 1 ro laríngeos
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• Tof > 0,3 : falla evaluación visual• DBS: hasta tof 0,6-0,7• Tetánico 100hz: desvanecimiento tof
0,8-0,9
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VALORACIÓN OBJETIVA
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MECANOMIOGRAFIA
• Tension 200-300 gr de precarga fuerza de contracción.
• Control: 8-12 min, 2-5seg 50Hz
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ELECTROMIOGRAFIA
• Potenciales de acción: placa (1/3 medio mm), inserción y uno neutro
• Osciloscopio• % control o radio tof• Mediano y ulnar• Interoseo, hipotenar (< artefactos,
sobreestimar)
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Cuerdas vocalesDiafragma: paravertebral t2l1 derecho. Estímulo frénico en cuello.
Confiabilidad: posición de electrodos, precarga, posición sobre el músculo, interferencia. No retorna a basal.
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Figure 39-13 Evoked electromyographic printout from a Relaxograph. Initially, single-twitch stimulation was given at0.1 Hz, and vecuronium (70 μg/kg) was given intravenously for tracheal intubation. After approximately 5 minutes, themode of stimulation was changed to TOF stimulation every 60 seconds. At a twitch height (first twitch in TOF response)of approximately 30% of control (marker 1), 1 mg of vecuronium was given intravenously. At marker 2, 1 mg ofneostigmine was given intravenously, preceded by 2 mg of glycopyrrolate. The printout also illustrates the commonproblem of failure of the electromyographic response to return to control level. (Courtesy of Datex-Ohmeda, Helsinki,Finland.)
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ACELEROMIOGRAFIA
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Comparable mmg y emg. Radio >1.0
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MONITOR PIEZOELECTRICO
• Movimiento de banda = voltaje
• No validado
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FONOMIOGRAFIA
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EVALUACION DE LAS RESPUESTAS EVOCADAS
3-6´
• TOF:• 1: 90-95%• 4: 60-85%• QX: 1-2
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BLOQUEO RESIDUAL
• <0,9• Alt esfinter
esofágico y mm faríngeos: aspiración
• Rta hipoxia• Uso bnm
intermedios: 3010%
Train-of-Four Ratio Signs and Symptoms
0.70-0.75 Diplopia and visual disturbancesDecreased handgrip strengthInability to maintain apposition of the incisor teeth“Tongue depressor test” negativeInability to sit up without assistanceSevere facial weaknessSpeaking a major effortOverall weakness and tiredness
0.85-0.90 Diplopia and visual disturbancesGeneralized fatigue
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Clinical Tests of Postoperative Neuromuscular Recovery
Unreliable Sustained eye openingProtrusion of the tongueArm lift to the opposite shoulderNormal tidal volumeNormal or nearly normal vital capacityMaximum inspiratory pressure less than 40 to 50 cm H2O
Most Reliable Sustained head lift for 5 secondsSustained leg lift for 5 secondsSustained handgrip for 5 secondsSustained “tongue depressor test”
Maximum inspiratory pressure 40 to 50 cm H2O or greater
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Anestesia: > sensibilidad a bnm con disminución del
VC y >CO2 esp
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Complicaciones POPCx < 200 minNegra: TOF < 0.70 pancuronioRoja, atracurio y vecuronio: TOF ≥ 0.70 pancuronio
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Figure 39-19 Typical recording of the mechanical response (Myograph 2000) to TOF nerve stimulation of the ulnarnerve after injection of 1 mg/kg of succinylcholine (arrow) in a patient with genetically determined abnormal plasmacholinesterase activity. The prolonged duration of action and the pronounced fade in the response indicate a phase IIblock.
Antagonizar?
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UTILIDAD CLINICA
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ALTERAN LA MONITORIA
• Hipotermia central• Hipotermia de la extremidad• Lesión nervio, ME, SNC• Edad• Tipo de cx
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