Dr Dhaher Jameel Salih Al-habbo FRCP London UK Assistant Professor Department of Medicine.

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Presentation transcript:

Dr Dhaher Jameel Salih Al-habbo FRCP London UK Assistant Professor Department of Medicine

 Examination of the patient with suspected pulmonary disease includes inspection, palpation, percussion, and auscultation of the chest.  An efficient approach begins with observing the pattern of breathing, auscultation of the chest, and inspection for extrapulmonary signs of pulmonary disease. More detailed examination follows from initial findings

 Include digital clubbing, cyanosis, elevation of central venous pressures, and lower extremity edema.  Digital clubbing refers to structural changes at the base of the nails that include softening of the nail bed and loss of the normal 150- degree angle between the nail and the cuticle.  The distal phalanx is convex and enlarged: its thickness is equal to or greater than the thickness of the distal interphalangeal joint.

 Hypertrophic pulmonary osteoarthropathy is a syndrome of digital clubbing, chronic proliferative periostitis of the long bones, and synovitis.  It is seen in the same conditions as digital clubbing but is particularly common in bronchogenic carcinoma.  The cause of clubbing and hypertrophic osteoarthropathy may reflect platelet clumping and local release of platelet-derived growth factor at the nail bed.

 Cyanosis is a blue or bluish-gray discoloration of the skin and mucous membranes caused by increased amounts (> 5 g/dL) of unsaturated hemoglobin in capillary blood.  Cyanosis is therefore not a reliable indicator of hypoxemia but should prompt direct measurement of arterial PO2 or of hemoglobin saturation

 Estimation of central venous pressure (CVP) and assessment of lower extremity edema are indirect measures of pulmonary hypertension, the major cardiovascular complication of chronic lung disease.  Elevated CVP is a pathologic finding associated with impaired ventricular function, pericardial effusion or restriction, valvular heart disease, and chronic obstructive or restrictive lung disease.  Peripheral edema is a nonspecific finding that, in the setting of chronic lung disease, suggests right ventricular failure 

 Look for any obvious chest or spine deformities.  These may arise as a result of chronic lung disease (e.g. emphysema), occur congenitally, or be otherwise acquired.  Pectus excavatum: Congenital posterior displacement of lower aspect of sternum. This gives the chest a somewhat "hollowed- out" appearance. The x-ray shows a subtle concave appearance of the lower sternum.

 The pattern of breathing refers to the respiratory rate and rhythm, the depth of breathing or tidal volume, and the relative amount of time spent in inspiration and expiration.  Normal values are a rate of 12–14 breaths per minute, tidal volumes of 5 mL/kg, and a ratio of inspiratory to expiratory time of 2:3.

 Tachypnea is an increased rate of breathing and is commonly associated with a decrease in tidal volume.  Respiratory rhythm is normally regular, with a sigh (1.5–2 times normal tidal volume) every 90 breaths or so to prevent collapse of alveoli and atelectasis.  Alterations in the rhythm of breathing include rapid, shallow breathing, seen in restrictive lung disease and as a precursor to respiratory failure

 Kussmaul :breathing, rapid large volume breathing indicating intense stimulation of the respiratory center, seen in metabolic acidosis.  Cheyne-Stokes respiration, a rhythmic waxing and waning of both rate and tidal volumes that includes regular periods of apnea. This last pattern is seen in patients with end-stage left ventricular failure or neurologic disease and in many normal persons at high altitude, especially during sleep.

 During normal quiet breathing, the primary muscle of respiration is the diaphragm. Movement of the chest wall is minimal.  The use of accessory muscles of respiration, the intercostal and sternocleidomastoid muscles, indicates high work of breathing.  At rest, the use of accessory muscles is a sign of significant pulmonary impairment.

 As the diaphragm contracts, it pushes the abdominal contents down.  Hence, the chest and abdominal wall normally expand simultaneously.  Expansion of the chest but collapse of the abdomen on inspiration indicates weakness of the diaphragm.

 The chest normally expands symmetrically. Asymmetric expansion suggests unilateral volume loss, as in atelectasis or pleural effusion, unilateral airway obstruction, asymmetric pulmonary or pleural fibrosis, or splinting from chest pain.

 The palpation as follows:  The trachea at the suprasternal notch, to detect shifts in the mediastinum; on the posterior chest wall, to gauge fremitus and the transmission through the lungs of vibrations of spoken words; and on the anterior chest wall to assess the cardiac impulse.  All these maneuvers are characterized by low interobserver agreement

 Chest percussion identifies dull areas that correspond to lung consolidation or pleural effusion.  Hyperresonant areas suggesting emphysema or pneumothorax.

 Normal lung sounds heard over the periphery of the lung are called vesicular.  They have a gentle, rustling quality heard throughout inspiration that fades during expiration.  Normal sounds heard over the suprasternal notch are called tracheal or bronchial lung sounds. They are louder, higher-pitched, and have a hollow quality that tends to be louder on expiration.

 Bronchial lung sounds heard over the periphery of the lung are abnormal and imply consolidation.  Globally diminished lung sounds are an important finding predictive of significant airflow obstruction.

 Abnormal lung sounds (“adventitious” breath sounds) may be continuous (> 80 ms in duration) or discontinuous (< 20 ms).  Continuous lung sounds are divided into (a)wheezes, which are high-pitched, musical, and have a distinct whistling quality.  Wheezes occur in the setting of bronchospasm, mucosal edema, or excessive secretions.

 (b) Rhonchi, which are lower-pitched, sonorous, and may have a gurgling quality. Rhonchi originate in the larger airways when excessive secretions and abnormal airway collapsibility cause repetitive rupture of fluid films.  Rhonchi frequently clear after cough.  In each case(wheezes or Rhonchi),the airway is narrowed to the point where adjacent airway walls flutter as airflow is limited.

 Discontinuous lung sounds are called crackles— brief, discrete, nonmusical sounds with a popping quality.  Fine crackles are soft, high-pitched, and crisp (< 10 ms in duration).  They are formed by the explosive opening of small airways previously held closed by surface forces and are heard in interstitial diseases or early pulmonary edema. 

 Coarse crackles are louder, lower-pitched, and slightly longer in duration (< 20 ms) and probably result from gas bubbling through fluid.  Coarse crackles are heard in pneumonia, obstructive lung disease, and late pulmonary edema.  The timing and character of crackles can reliably distinguish different pulmonary disorders.  Fine, late inspiratory crackles suggest pulmonary fibrosis, while early coarse crackles suggest pneumonia or heart failure.