Name: measuring lung air volumes
Uploaded: 2024-06-20T13:02:59.000Z
Duration: 1 min 15 s
Channel: JoVE

呼吸量は、個人が吸い込んだり吐いたりする空気の量で、一般的にはリットルで測定されます。
5つの呼吸量は、呼吸器系の健康の重要なマーカーとして機能します。
1つ目は、一息で吸い込んだり吐いたりする空気である一回換気量、またはTVです。通常、成人は1回の呼吸で約500ミリリットルの空気を吸い込みます。
次は、1分間に吸い込んだ空気と吐き出した空気を測定する微小体積(MV)です。通常のMV値の範囲は5〜8リットルです。
次に、吸気予備量(IRV)と呼ばれる、個人が1回の呼吸で吸い込むことができる最大空気のことです。平均IRV値は約3000ミリリットルです。
逆に、呼気予備量(ERV)は、通常の呼気を超えて強制的に吐き出される最大空気です。通常、ERVの範囲は1200〜1500ミリリットルです。
最後に、残留量は、力強く呼気した後でも肺に残った空気です。通常の範囲は通常1000〜1200ミリリットルです。

呼吸量

Respiratory Volumes

呼吸量は重要な指標であり、呼吸サイクルのさまざまな段階で肺の内外で交換される空気を定量化するために注意深く測定されます。 これらの正確な測定は、肺機能の評価、呼吸状態の診断、呼吸器全体の健康状態の監視に不可欠です。 各パラメータは、呼吸の仕組みと肺の機能能力についての具体的な洞察を提供します。

1 回換気量 (TV) 1 回換気量 (TV) は、1 回の通常の呼吸で吸入または吐き出される空気です。 成人の場合、典型的な一回換気量は 1 回の呼吸で約 500 ミリリットルです。 この測定は、安静状態で肺を通過する基本的な空気量を表し、他の呼吸量を測定するためのベースラインを提供するため、不可欠です。

分時換気量 (MV) 分時換気量 (MV) は、1 分あたりに肺で交換される空気の総量を測定し、1 回換気量に呼吸数 (1 分あたりに行われる呼吸の数) を乗算して計算されます。 通常の分時体積値は、個人の活動レベルと生理学的状態に応じて、通常 1 分あたり 5 ～ 8 リットルの範囲です。 このパラメータは、人が通常の活動や運動中に達成している全体的な換気量を評価するために重要です。

予備吸気量 (IRV) 予備吸気量 (IRV) は、通常の 1 回換気量を超えて吸入できる最大空気を示します。 平均 IRV は約 3000 ミリリットルです。 この体積は、肺の予備能力を評価するのに重要であり、激しい身体活動中や呼吸困難など、酸素摂取量の増加が必要な状況では特に重要です。

予備呼気量 (ERV) 予備呼気量 (ERV) は、通常の呼気の後に強制的に吐き出すことができる最大空気です。 通常、ERV は 1200 ～ 1500 ミリリットルの範囲です。 この測定は、呼気の予備能力を決定するのに役立ちます。これは、空気を効率的に排出する肺の能力を評価するために重要です。 慢性閉塞性肺疾患（COPD）状態では、多くの場合減少します。

残留量: 残留量は、勢いよく吐き出した後に肺に残っている空気であり、通常は 1000 ～ 1200 ミリリットルです。 この容積は、肺内の容積を一定に維持することで肺の虚脱を防ぐため、非常に重要です。 また、呼吸間の継続的なガス交換も促進します。 残存量の変化は、拘束性または閉塞性の肺疾患を示している可能性があります。
測定手法: 呼吸量は、標準的な肺機能検査であるスパイロメトリーを使用して測定されるのが最も一般的です。 肺活量測定では、吸気時と呼気時の空気量と流量を測定する装置に息を吹き込みます。 この検査は、喘息、COPD、拘束性肺疾患などの症状の診断に役立ちます。
結論: これらの呼吸量を理解し、測定することは、臨床呼吸器学の基礎です。 これらは肺の仕組みと機能に関する詳細な洞察を提供し、医療提供者が呼吸状態を効果的に診断、監視、管理できるようにします。 呼吸量を定期的に評価することは、肺機能の変化を早期に検出するのに役立ち、適切な介入と呼吸器の健康管理の改善につながります。

呼吸量は重要な指標であり、さまざまな段階で肺に出入りする空気を定量化するために細心の注意を払って測定されます...

Education

JoVE Core

Nursing

看護

Unit 1

ユニット1

Vital Signs: Respiration

バイタルサイン：呼吸

KEY TERMS AND CONCEPTS

主要用語および概念

measuring lung air volumes

Respiratory volumes measure how much air moves in and out of the lungs during breathing. These values help assess lung function, support diagnosis of respiratory conditions, and track overall respiratory health. Each measurement gives a different view of how the lungs work.

Tidal volume (TV) is the air inhaled or exhaled in one normal breath. In adults, it is about 500 milliliters per breath. It serves as the baseline volume for resting breathing.

Minute volume (MV) is the total air exchanged through the lungs each minute. It is found by multiplying tidal volume by respiratory rate, which is the number of breaths taken per minute. Normal minute volume usually ranges from 5 to 8 liters per minute, depending on activity level and physiological condition. This value shows how much ventilation a person is achieving during normal activity and exercise.

Inspiratory reserve volume (IRV) is the extra air that can be inhaled after a normal breath in. The average IRV is about 3000 milliliters. Expiratory reserve volume (ERV) is the maximum air that can be forcefully exhaled after a normal exhalation. It usually ranges from 1200 to 1500 milliliters. ERV helps measure how well the lungs can expel air, and it is often reduced in chronic obstructive pulmonary disease, or COPD.

Residual volume is the air left in the lungs after a forceful exhalation. It is typically between 1000 and 1200 milliliters. This air helps prevent lung collapse and supports continuous gas exchange between breaths. Changes in residual volume can point to restrictive or obstructive lung disease.

Spirometry is the most common way to measure respiratory volumes. In this pulmonary function test, a person breathes into a device that records air volume and flow during inhalation and exhalation. Spirometry helps diagnose asthma, COPD, and restrictive lung disease. These measurements give healthcare providers detailed information about lung mechanics and function, which supports monitoring and timely treatment of respiratory problems.

Measuring Lung Air Volumes

respiration

Respiratory System and Gas Exchange

The respiratory system supports energy production by bringing oxygen into the body and removing carbon dioxide. In human cells, oxidation uses food molecules and oxygen to produce carbon dioxide and water. This process helps sustain life and depends on the respiratory system. Air moves through a pathway that includes the nose, oropharynx, larynx, trachea, bronchi, bronchioles, and lungs. Air enters through the nose and mouth, passes through the pharynx, and then moves through the larynx, which...

physiological control of respiration

How the Brain Regulates Breathing

How the brain regulates breathing is controlled by the respiratory center in the brainstem. This center manages involuntary breathing, so respirations continue without conscious effort and stay smooth and steady. Ventilation is maintained by monitoring carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration, or pH, in arterial blood. CO2 is the most important signal in this control system. When CO2 rises, the respiratory control system increases the rate and depth of breathing so...

respiration and gaseous exchange

How Heart and Lungs Exchange Gases

Heart and lung function work together to move oxygen and carbon dioxide through the body. This gas exchange depends on the cardiovascular system, which includes the heart and blood vessels, and on the respiratory system, which brings air to the alveoli and removes waste gases. The heart is a cone-shaped muscular pump at the center of this system. It has four chambers: two atria on top and two ventricles below. The atria receive blood from veins, including the superior and inferior vena cava...

mechanism of breathing i: inspiration

How Air Moves Into the Lungs

Air enters the lungs through a coordinated breathing process called inspiration, or inhalation. This is the first phase of the respiratory cycle. The respiratory system includes the conducting zone and the respiratory zone, and both help move air toward the place where gas exchange occurs. During inspiration, air comes in through the nose or mouth and passes through the conducting zone. This pathway includes the nasal cavity, trachea, and bronchi. These structures filter, warm, and humidify...

mechanism of breathing ii: expiration

How the Body Pushes Air Out

Expiration is the process of pushing air out of the lungs. It begins when the inspiratory muscles relax. That relaxation starts a chain of changes in the chest and lungs. As the diaphragm relaxes, it moves upward. This lowers the volume of the thoracic cavity, or chest space. The pleural cavity also contracts and presses on the lungs. The intercostal muscles, which sit between the ribs, help during this phase too. They pull the ribs downward and inward. This makes the chest cavity even...

mechanism of breathing iii: the accessory muscles

mechanism-of-breathing-iii-the-accessory-muscles

Accessory Muscles That Support Breathing

Accessory muscles help the respiratory system expand the chest and move air when breathing needs extra effort. The diaphragm is still the main breathing muscle, but other muscles can assist during inhalation and exhalation. This support becomes important during deep breathing or when the body faces breathing challenges. Several accessory muscles help with inhalation. The sternocleidomastoid, which is in the neck, lifts the sternum and helps the chest cavity expand. The scalene muscles also sit...

factors affecting respiration

How Breathing Changes in Different Conditions

Respiration changes with age, activity, health, and the environment. It is the process of exchanging oxygen (O2) and carbon dioxide (CO2) between the body and the surroundings. Many factors can alter how fast and how deeply a person breathes. Newborns usually breathe faster than older children and adults. Their respiratory rate can range from thirty to sixty breaths per minute because their metabolic needs are higher. As people age, metabolic rate often decreases, and breathing tends to slow. <br...

respiratory assessment: purpose and indications

respiratory-assessment-purpose-and-indications

Breathing Checks in Patient Monitoring

Respiratory assessment is a key part of patient monitoring in nursing. It helps detect early signs of clinical deterioration. Breathing changes often appear before other signs of worsening health, so nurses watch respiratory rate, breathing pattern, and breath sounds closely. A complete respiratory assessment goes beyond counting breaths. It includes inspection, which means looking at chest symmetry, effort, and use of accessory muscles. It also includes palpation, or feeling for tenderness,...

assessment of airway, skin color, and use of accessory muscles

assessment-of-airway-skin-color-and-use-of-accessory-muscles

Respiratory Signs to Check During Breathing

Respiratory assessment starts with checking the airway, skin color, and use of accessory muscles during breathing. These signs give quick clues about respiratory status and possible complications. A clear airway, normal skin color, and no accessory muscle use usually point to effective oxygenation and perfusion. Airway assessment is an important first step in any health check. Clinicians look for anything that could block breathing, such as vomit, a foreign object, or the tongue. In a...

assessment of ventilation i: respiratory rate

assessment-of-ventilation-i-respiratory-rate

Checking Breathing Patterns and Respiratory Rate

Ventilation assessment helps monitor a patient’s health status by checking breathing patterns and respiratory rate. Respiration is one of the easiest vital signs to observe. It can also show problems in several body systems, including serious issues such as brainstem injury after head trauma. Accurate assessment depends on unobtrusive observation. The patient should not know they are being watched, because awareness can change breathing patterns. A full evaluation also considers the patient’s...

assessment of ventilation ii: respiratory depth and rhythm

assessment-of-ventilation-ii-respiratory-depth-and-rhythm

Watching Breathing Depth and Rhythm

Breathing depth and rhythm help show how a person is ventilating. Respiratory depth is the amount of air inhaled or exhaled in one breath. It may be shallow or deep, and it usually stays steady when a person is resting or asleep. A deep sigh is an automatic deep breath that fills the lungs with more air than normal breathing. Respiratory depth is checked by watching chest excursion, or chest movement. Deep respiration shows full lung expansion and complete exhalation. Shallow respiration moves...

assessment of diffusion and perfusion

Gas Exchange Checks in Respiratory Care

Gas exchange checks in respiratory care focus on diffusion, perfusion, oxygen saturation, and capnography. These measures help show how well the lungs and blood vessels move oxygen in and remove carbon dioxide from the body. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. In the lungs, oxygen diffuses from the alveoli, the tiny air sacs, into the bloodstream. Carbon dioxide, which is made during cell metabolism, moves from the...

respiratory volumes and capacities i

Breathing Rates and Pattern Changes

Breathing rate and rhythm are important signs of respiratory health. A complete one-minute count helps show the patient’s breathing pattern. Even a small rise of three to five breaths per minute can be an early sign of respiratory distress. Patients with a rate above twenty-four breaths per minute need close monitoring for possible changes in body function. Normal and abnormal respirations have clear names. Eupnea means normal, gentle breathing with a regular rate and rhythm, usually twelve to...

alterations in respiration ii

Breathing Patterns and Their Clinical Meaning

Breathing patterns can be regular, deep, or shallow, and they can also become abnormal. These changes help explain how ventilation is affected in different conditions. Clinically, they are important because they can guide patient evaluation. Biot's breathing is irregular in both rate and depth. It alternates between deep gasping breaths and apnea, which is a pause in breathing. It may occur with increased intracranial pressure or damage to the brain's respiratory center, such as from stroke,...

respiratory volumes

Respiratory volumes measure how much air moves in and out of the lungs during breathing. These values help assess lung function, support diagnosis of respiratory conditions, and track overall respiratory health. Each measurement gives a different view of how the lungs work. Tidal volume (TV) is the air inhaled or exhaled in one normal breath. In adults, it is about 500 milliliters per breath. It serves as the baseline volume for resting breathing. Minute volume (MV) is the total air exchanged...

respiratory capacities

Lung Capacity Measures in Breathing

Lung capacity measures show how much air the respiratory system can move and hold during different parts of breathing. These measures help describe lung function in a more complete way. They are useful for understanding how the lungs work during inhaling and exhaling. Inspiratory capacity, or IC, is the maximum amount of air that can be inhaled with full effort. It is found by adding tidal volume and inspiratory reserve volume. IC usually ranges from 2.4 to 3.6 liters. Functional residual...

special considerations while measuring oxygen saturation

special-considerations-while-measuring-oxygen-saturation

Checking Breathing Rate and Oxygen Levels

Checking breathing rate and oxygen levels helps assess how well a patient is breathing. Respiratory rate is the number of breaths taken in one minute. Oxygen saturation shows how much oxygen is being delivered to the body’s tissues. Together, these signs give a fuller picture of respiratory function. The normal adult breathing rate is usually 12 to 20 breaths per minute. A lower rate may suggest respiratory depression or decreased oxygen levels. A rate above 20 breaths per minute may point to...

assessment of respiration

Respiratory Assessment Signs and Findings

Respiratory assessment looks at the signs and findings that show how well a person is breathing. It uses both subjective data and objective data to judge respiratory health. The respiratory system’s basic structures and main functions provide the basis for this check. Subjective assessment starts with an interview. Nurses ask about medical history, medicines, current symptoms, past respiratory problems like asthma or COPD, surgeries, and allergies. Family history also matters because it can...

key terms and concepts

Learn how tidal volume, minute volume, IRV, ERV, and residual volume are measured with spirometry to assess lung function and respiratory health.

Measuring Lung Air Volumes | JoVE K12

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nursing

Measuring Lung Air Volumes

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