Which sign is among the indications of SBT failure?

Which sign is among the indications of SBT failure?

• A. Tachypnea
• B. Desaturation
• C. Tachycardia
• D. Diaphoresis

Answer: (A)

Tachypnea reflects increased work of breathing and an inability to sustain adequate ventilation when support is removed. During a spontaneous breathing trial, the body should be able to maintain ventilation with minimal distress; a rising respiratory rate indicates the respiratory muscles are overwhelmed and fatigue is looming, signaling that the patient likely cannot tolerate extubation. While desaturation, tachycardia, or diaphoresis can occur with intolerance, they are less specific and can be influenced by other factors, whereas an increasing breathing rate is a direct cue of failing to meet ventilatory demands.

Tachypnea reflects increased work of breathing and an inability to sustain adequate ventilation when support is removed. During a spontaneous breathing trial, the body should be able to maintain ventilation with minimal distress; a rising respiratory rate indicates the respiratory muscles are overwhelmed and fatigue is looming, signaling that the patient likely cannot tolerate extubation. While desaturation, tachycardia, or diaphoresis can occur with intolerance, they are less specific and can be influenced by other factors, whereas an increasing breathing rate is a direct cue of failing to meet ventilatory demands.