Maximum minute ventilation (MVV)

The maximum ventilation per minute (MVV) is measured once per second by the examiner, breathing 12 times at the maximum and maximum speed and multiplying by 5. The predicted value of 0.60 is abnormal and is seen in lesions of the thoracic, airway, and lung tissues. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Tips: Patients should eliminate tension and cooperate with doctors to avoid affecting the results. Normal value Male: 104+2.71L; Female: 82.5+2.17L. Clinical significance Abnormal results: The nature of this examination is the ventilation reserve capacity test. It is used to measure the elasticity of the thoracic lung tissue, airway resistance, and respiratory muscle strength. Medically, the ratio of the measured value to the theoretical predicted value is used to indicate its size. Normally greater than 80%, less than 60% is abnormal - ventilation reserve capacity is reduced. Need to check the crowd: Difficulty breathing, patients with hypoxic signs. Precautions Preparation before inspection: 1. Before the examination, the subjects should be explained in detail about the inspection methods and essentials, and adaptive training should be done. 2. Due to the difference in measurement methods and instruments, and the degree of cooperation of the subjects, the maximum range of maximum ventilation is large. The normal range is generally taken as a percentage of the predicted value of ±20%. Requirements for inspection: 1. Patients should eliminate tension and cooperate with doctors to avoid affecting the results. 2. The gender, age, height and muscle strength of the subject may affect the results of the above examination. Not suitable for people: Contraindications: 1 severe heart and lung disease, the body is weak. 2 mental disorders or can not be well coordinated. Inspection process The examinee presses once every second, and breathes 12 times at the maximum and maximum speed and multiplies by 5 to measure. Estimated value calculation formula: Male: (85.5-0.522 × age) × body surface area (m2). Female: (71.3 - (0.47 × age) × body surface area (m2). Not suitable for the crowd Taboo people: 1 severe heart and lung disease, the body is weak. 2 mental disorders or can not be well coordinated. Adverse reactions and risks Generally no complications and harm.