Assist Control (AC) vs SIMV Mode | Synchronous Intermittent Mandatory Ventilation

What is Assist/Control (A/C)? What is SIMV? What are the major differences in these Ventilator Modes?
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➡️ What are the Primary Ventilator Modes?
1. Assist/Control (A/C)
2. Synchronous Intermittent Mandatory Ventilation (SIMV)

➡️ Assist/Control (A/C) Mode
In this mode, a minimum number of preset mandatory breaths are delivered by the ventilator but the patient can also trigger assisted breaths. The patient makes an effort to breathe and the ventilator assists in delivering the breath. With that said, just know that the breaths are not spontaneous. They are patient triggered, but the breaths are still delivered by the ventilator. The sensitivity control can be adjusted to make it easier or harder for the patient to initiate a breath.

➡️ Indications for Assist/Control
This mode is most often used when mechanical ventilation is first initiated for a patient because this mode provides full ventilatory support. That is also one of the advantages of using Assist/Control because it keeps the patient's work of breathing requirement very low. One of the major complications of Assist/Control is hyperventilation, which results in respiratory alkalosis. This is the result of too many breaths given to the patient, whether patient-triggered or machine-triggered.

➡️ Synchronous Intermittent Mandatory Ventilation (SIMV) Mode
In this mode, the ventilator delivers a preset minimum number of mandatory breaths. However, it also allows the patient to initiate spontaneous breaths in between the mandatory breaths. This mode also allows the operator to set either a controlled pressure or a controlled volume. The primary indication for SIMV is when the patient needs partial ventilatory support, because, since the patient can takes spontaneous breaths, that means they can contribute to some of their minute ventilation. SIMV is a mode that is used for weaning as well.

➡️ Advantages of Using the SIMV Mode:
1. Since the patient is able to take spontaneous breaths, it helps to maintain their respiratory muscle strength and avoid muscular atrophy.
2. It distributes tidal volumes evenly throughout the lung fields, which reduces V/Q mismatching.
3. It helps to decrease the patient's mean airway pressure.

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🚑MEDICAL DISCLAIMER
Medicine and Respiratory Therapy are continuously changing practices. The information in this video is for educational and entertainment purposes only. For medical advice, please consult with a physician or qualified medical professional.

💡AFFILIATE DISCLAIMER
This description contains affiliate links. If you decide to purchase a product through one of them, we receive a small commission at no cost to you.

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⏰TIMESTAMPS
0:00 - Intro
0:07 - What are the Primary Ventilator Modes?
0:48 - Assist/Control (A/C) Mode
1:24 - Indications for Assist/Control
2:00 - Synchronous Intermittent Mandatory Ventilation (SIMV) Mode

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