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Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909

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BuyFindarrow_forward

Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Case 1

1. As the patient continued to lose blood, his alveolar ventilation became more and more

Summary Introduction

To review:

The result of the continuous loss of blood on the alveolar ventilation of the patient.

Introduction:

Ideally, the alveoli in the lungs need to receive an equal amount of ventilation and blood flow; however, this is not possible because the ventilation is about 4 L/min (liter per minute) and the capillary blood flow is 5 L/min. This ratio of ventilation to perfusion is referred to as ventilation–perfusion ratio (V/Q).

Please refer to Clinical Application Case-1 for further information.

Explanation

In the given case, the rise in V/Q ratio resulted in excessive blood loss due to trauma. Thus, the blood flow via lungs decreased progressively and the alveolar ventilation became physiologically ineffective. The surgery reversed the pathological process.

When an individual is injured, the injury site is the place where the blood comes in contact with air. Thus, the partial pressure of oxygen and carbon dioxide will be higher than normal. However, because of the continuous loss of blood, perfusion will decrease...

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