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Ann Thorac Surg 1997;63:1497-1502
© 1997 The Society of Thoracic Surgeons
Section of Thoracic and Cardiovascular Surgery, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| Abstract |
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| Introduction |
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A prerequisite of the reasonable use of chest tubes and drainage devices, however, is an understanding of the surgical anatomy, physiology, and pathology of the chest, pleural space, and mediastinum as well as the physics of suction drainage.
| The Beginning |
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| Open Drainage |
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| Thoracic Catheters |
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In 1975 catheters were manufactured in many sizes, from 6F to 40F in 2F increments. However, once a study showed that the most popular sizes were 28F, 32F, and 36F for adults and 16F, 20F, and 24F for pediatric patients [1], manufacturers stopped making catheters in the rarely used sizes, which was of benefit to all. Polyethylene catheters (Intracath), small plastic tubes (14 to 18 gauge) [8], or J-shaped catheters [9] were recommended for use in neonates with spontaneous pneumothorax or pneumothorax after needle biopsy of the lung [10]. Currently, straight, right-angle, and trocar chest catheters as well as multichannel tubes for sump-irrigation drainage made of polyvinyl chloride, silicone elastomer, or silicone are available. Most have a radiopaque line, multiple inlet holes, and a flared end to allow for attachment to the drainage unit. Approximately 1,330,000 catheters are used annually in the United States at a total cost of $10.6 million (1995 data) [11].
Salient descriptions of the insertion sites and methods of chest tube insertion have been published by Fishman [12], Miller and Sahn [8], Symbas [13], Munnell [14], and Gregoire and Deslauriers [15]. Some of the considerations brought up by these authors merit emphasis. For example, a 14- or 16-gauge needle or angiocath can be inserted quickly in the second or third interspace in the midclavicular line for the management of a life-endangering pneumothorax [14]. Usually chest tubes are inserted in the third to sixth intercostal space in the anterior or midaxillary line and then directed cephalad for the evacuation of free air or posteriorly for the evacuation of fluid. In addition, during thoracotomy a right-angle tube can readily be directed toward the costophrenic angle, but the tube position should avoid possible occlusion by diaphragmatic motion.
Loculated fluids can be drained by a tube using the exploring needle as a positioning guide. Occasionally a high posterior loculation must be drained at a point midway between the medial border of the scapula and the spinous process of the seventh cervical vertebra [16].
Fundamentally the preparation for chest tube insertion includes thorough and ample skin sterilization with an antiseptic such as povidone iodine, sterile draping, and complete local anesthesia of all chest wall layers. Local anesthesia is often enhanced by a brief delay to allow for thorough diffusion of the anesthetic [14]. The importance of anesthesia was emphasized by Lilienthal [5], who in 1926 observed that "the first rule in puncturing the chest is to avoid pain." Whether it is a needle, blunt dissection, or a trocar being passing through rib interspaces, a further technique for reducing postprocedural pain is to hug the top edge of the lower rib during passage of the instrument, which minimizes injury to the intercostal vessels and nerves [12].
The debate over which technique should be used for insertion of a chest tube must be resolved by the person placing the chest tube, who must consider the positive and negative attributes of each technique. All of these are described in the following paragraphs.
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| Thoracic Drainage Systems |
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The concept of the importance of using closed pleural drainage in all postoperative care was introduced by Lilienthal [5] in 1926, when he wrote about pulmonary resection for bronchiectasis. For many years most chest drainage involved the use of a single-bottle water trap, which he describes. Its major attributes were simplicity and low cost. Drawbacks of the technique included difficulty in measuring the drainage and increased resistance to drainage as fluid accumulated.
The time-honored arrangement of drainage bottles, usually called the three-bottle system (collection, water-seal, and manometer bottles), was described by Howe [29] in 1952 (Fig 3
). This arrangement serves as the basis for almost all thoracic drainage systems in use today.
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In 1995 approximately 60,000 glass bottle systems were used, but this represents only 4.5% of the total market [11]. Currently there are four manufacturers that provide the bulk of plastic drainage units; these are available in nine styles, with or without an autotransfusion feature. During 1995 these manufacturers supplied 1.3 million drainage units to hospitals in this country at a cost of approximately $60 million [11]. These included Pleur-evac (Deknatel-Snowden-Pencer), Tucker, GA, Atrium (Atrium Medical Corp, Hudson, NH), ThoraKlex (recently acquired thoracic drainage products from Davol by Deknatel-Snowden-Pencer), and Sentinel Seal and Thoraseal (Sherwood Medical, St. Louis, MO). Most include necessary features: a manual high negative pressure release valve; an automatic high negative pressure release valve (at -40 cm H2O); a positive-pressure release valve (at +2 cm H2O); sampling ports; serrated, tapered catheter connectors; and air leak meters. Two brands have connecting-tube pinch clamps attached, but this carries the risk of leading to inadvertent clamping. The ability to size the chest catheter connector is desirable. Some nonsizable connectors have an 18F opening, so if, for example, a 36F chest tube is connected to this connector, the efficiency of the air flow is reduced and blood clots may become trapped. Therefore, for reasons of safety and function, it appears that pinch clamps should be eliminated and all connectors should be sizable.
All but two of these systems have water manometers to adjust the vacuum. ThoraKlex is a completely waterless system with a one-way valve and vacuum limiter, whereas the Pleur-evac A-6000 has a dry suction control with a conventional underwater seal. Users should be aware, however, that these devices need more air flow from the vacuum source for them to function.
A collecting system was introduced in the mid-1970s that was designed exclusively for use in pneumonectomy patients. This unit provides balanced drainage with an intrapleural pressure of approximately -6 cm H2O [30]. However, the 1975 study mentioned earlier revealed that diverse practices were used for drainage of the pneumonectomy space, including no drainage, water seal with or without clamping of the connecting tube, the rare use of suction drainage, and balanced drainage [1]. Each year, however, a few more pneumonectomy drainage units are used.
Other thoracic drainage devices are the Denver pleural peritoneal shunt (Denver Biomaterials, Evergreen, Co) and the Heimlich valve (Becton-Dickinson, Franklin Lake, NJ). The Denver shunt is an integrated, compressible one-way valve designed to move pleural fluid into the abdomen, especially for palliation in patients with malignant pleural effusions and persistent chylothorax. Occasionally, however, the shunt becomes occluded (15%) [31].
The Heimlich valve was introduced in 1968 and is a flutter valve that is especially useful when emergency transport is anticipated [32]. The valve must be connected to some type of collection container. Tension pneumothorax resulting from reversal of the Heimlich valve has been reported [33]. Nevertheless, this device has a place in pleural drainage, if carefully used. More than 23,000 are sold each year [11].
| Management Considerations |
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One of these is that too often the connecting tube is allowed to hang so that it droops below the top of the collection container and a resulting fluid-filled loop causes the suction drainage to stop. Excess tubing should therefore be coiled on the bed and the tube should go straight from the patient to the collection system located on the floor. Fluid oscillations in the water seal synchronous with respiration (tidaling) confirm the presence of intrapleural pressures and tube patency. This motion stops when the lung is expanded or the system is blocked (clotting, kinking). If the amplitude of tidaling is increased, this indicates the existence of a large, empty intrapleural space; it may also be seen after lung resection or in the presence of atelectasis or incomplete lung expansion resulting from other reasons. A chest tube should never be clamped, except momentarily in the event of a disconnection or unit breakage or to locate a leak in the drainage setup. Irrigation of a chest catheter or drainage tube should be discouraged but occasionally must be done if blood clot blockage is suspected or when an instillation is done for pleurodesis. The possibility of infection (empyema) resulting from these maneuvers should be borne in mind. The foaming of serosanguineous fluid in the collection chamber can be controlled by adding one ounce (30 mL) of alcohol or Mylicon (simethicone). Stripping of the connecting tube is discouraged. Vacuums of up to -400 cm H2O have been reported to result from stripping [35], and little benefit is achieved from it [36]. Reexpansion pulmonary edema is infrequent and usually seen in the setting of lung collapse resulting from pneumothorax or effusion of several days' duration [37]. When this is encountered, slow, intermittent reexpansion of the lung is recommended (as was recommended in 1818 by Zang) [2]. In patients with large air leaks and high suction, fluid in the water seal and manometer chambers will evaporate, leading to the lowering of fluid levels with a loss of the water seal or reduced suction, or both.
A few surgeons attach two chest tubes to separate drainage units. Although occasionally this may be prudent (eg, loculated collections of different substances), this increases the cost and is cumbersome. A better method is to connect the chest tubes to a Y-connector and then to a single drainage unit or to use a dual-chamber collection unit. Both are simpler and cheaper to use and have the added advantage of providing the same amount of suction to the chest tubes.
| Suction |
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During World War II it was found that the best management of chest trauma required suction drainage. However, there was no agreement as to how much suction should be used. Some favored low suction (-10 cm H2O) [38] and others high suction (-40 cm H2O) [39]. The most common suction pressure is -20 cm H2O, which probably evolved from the fact that when a commonly used gallon glass bottle was filled to near where the bottle tapered at its neck and the end of the vent tube was positioned about 2 cm from the bottom of the bottle, so that the tube was submerged about 20 cm, which in turn controlled the pressure of the vacuum in the system.
As pulmonary resection became more common, so did postoperative air leaks. In 1957 Perkins [38] noted that the volume of air flow "has been given insufficient attention" and that lung expansion had been treated by increasing the negative pressure rather than by using a pump capable of removing a minute volume of air that exceeded the minute volume of the air leak. The following year, Roe [39] also stressed the importance of high-flow vacuum using regulated wall suction systems rather than portable pumps.
In 1961 Batchelder and Morris [40] found that the rate of postthoracotomy air leaks ranged from 3.6 to 16.0 L/min. Interestingly, the patient with the latter leak survived what would usually have been a lethal bronchopleural leak.
Perhaps in response to these reports, J. H. Emerson Co (Cambridge, MA) introduced a portable pleural suction pump in 1955 capable of a regulated negative pressure of up to -60 cm H2O and air flows of up to 50 L/min (when used with Emerson collection units). However, users must exercise caution when using this system in a patient with a large air leak, because of the ease which it can generate high air flow suction that may lead to hypoxemia [41].
Using a laboratory model simulating a bronchopleural fistula, Rusch and colleagues [42] in 1988 found that three drainage systems did not have an adequate flow capacity and only one could handle a high-flow air leak (35 L/min). The design of the study did not take into account that the waterless manometer unit needs more wall suction to function properly and that the simulated air leak was much higher than is usually seen clinically. Nevertheless, this stimulated manufacturers to modify drainage units so that greater air volumes could be moved.
Finally, variations in the mixed diameters of the components of vacuum systems, as well as thoracic drainage setups, influence the air flow capabilities in managing large volume air flow drainage and waterless manometer valving drainage devices [8, 40] so the design of these systems must consider gas and fluid dynamics (Poiseuille's and Fanning's laws).
The pitfalls of suction drainage are simple: too little, too much, and the inexperience of the users. If there is too little flow through the system, the likelihood of tension pneumothorax, atelectasis, fluid accumulation, and infection increases [38]. If there is too much flow through the system, air leaks may be perpetuated, increased air stealing may lead to hypoxia [41], and rarely lung may be trapped within the chest catheter openings [43].
These problems associated with chest drainage are more likely to occur in patients with massive air leaks, such as occur in the setting of traumatic airway disruption; after some types of pulmonary resection; in patients with ruptured bullae or a pneumothorax associated with Pneumocystis carinii; and occasionally in those suffering from barotrauma. High flow can be produced in most water manometerstyle drainage systems by blocking the air vent of the manometer, thereby creating regulated "straight wall suction." Both waterless manometer systems and the portable electric vacuum system have high-flow capabilities. When an air leak persists or increases, the lung remains poorly expanded, and the patient's condition is deteriorating, there is a strong urge to "turn up the suction to pull the lung up against the chest wall," which at times is correct. However, increasing the suction (the negative pressure and flow) may only increase the magnitude of the bronchopleural fistula [44]. Recovery depends on reversing the pulmonary edema, the atelectasis, or any other underlying lung disorder responsible for the acute respiratory failure (R. Peters, personal communication). Actually, the lowest level of chest tube suction that maintains some lung inflation is the most desirable [41]. Patients with air leaks greater than 500 mL/breath (normal tidal volume) usually do not survive [45]. The treatment for a high-flow bronchopleural fistula, in addition to conventional chest drainage, may include mechanical ventilation to ensure adequate air exchange [41], high-frequency jet ventilation [46], intermittent inspiratory chest tube occlusion [47], and independent lung ventilation [48].
| Footnotes |
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| References |
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