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Central venous lines in neonates: a study of 2186 catheters
  1. D W Cartwright
  1. Correspondence to:
    Dr Cartwright
    Royal Brisbane and Women’s Hospital, RBH Post Office, Brisbane, Queensland 4029, Australia; David_Cartwrighthealth.qld.gov.au

Abstract

Objective: To describe the use of percutaneously inserted silicone central venous lines (CVLs) in neonates at the Royal Brisbane and Women’s Hospital, Australia.

Design: Data for all infants admitted from 1 January 1984 until 31 December 2002 who had a CVL were examined in the neonatal database, completed from paper records and patient charts where necessary. Autopsy reports of all babies who died with a catheter in place were reviewed.

Results: There were 18 761 admissions, 2186 catheters in 1862 babies for a total of 35 159 days (median 14 days, range 1–99 days). The tip was in the right atrium for 1282 (58.6%) of the catheters. A total of 142 babies (7.6%) died with a CVL in place, 89 (4.8%) with the catheter tip in the right atrium. Thirty two of these 89 babies had an autopsy. No autopsies reported tension in the pericardium or milky fluid resembling intralipid. One case (0.05% of catheters) of non-lethal pericardial effusion occurred in a baby whose catheter was inappropriately left coiled in the right atrium. There were no cases of pleural effusion related to CVL use. Most (1523, 69.7%) were removed electively. Septicaemia occurred during the life of 116 catheters (5.3%).

Conclusion: This is the largest series of percutaneously inserted silicone central venous catheters reported. It illustrates the safety of these catheters in this context. It highlights the value of keeping prospective records on such catheters. Catheters with their tips in the right atrium and not coiled did not cause pericardial effusion. Strict insertion and management principles for CVLs should be adhered to.

  • CRBSI, catheter related blood stream infections
  • CVL, central venous line
  • central venous lines
  • infection
  • pericardial effusion
  • tip position

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Percutaneous insertion of silastic (silicone) catheters was described by Shaw1 in 1973. Using scalp veins preferentially, he threaded the catheter “into the right atrium of the heart”. He then checked the catheter position radiographically while injecting radio-opaque contrast.

Recently reported complications of central venous catheters include cardiac tamponade from catheters with tips in the right atrium,2,3,4,5,6,7,8,9,10 right ventricle,11 and superior vena cava,12 myocardial infiltration in the right atrium,13 pleural effusion,5,14,15 ascites (tip in inferior vena cava),16 pericarditis (tip in superior vena cava),17 erosion into pulmonary vessels,18 hypoglycaemia (tip in shoulder and abdominal wall),19,20 diaphragmatic paralysis,21,22 paraplegia and myoclonus (tip in ascending lumbar vein),23–26 and venous sinus thrombosis (tip in jugular vein).27

The 2001 Manchester Report28 in the United Kingdom reported on a coronial inquiry into four deaths caused by central venous catheters, two of them silicone percutaneously inserted central catheters. A recommendation of this report was that “until further investigation is undertaken concerning the ideal positioning of the catheter tip, all central venous lines inserted specifically for parenteral nutrition in this age group should be sited outwith the cardiac chambers”. Implicitly critical, paragraph 5.17 states “records are not kept of the number of long lines inserted per year. This requires more careful audit of both insertion and complication rates. We are confident that the same comment could be made regarding many of the units in the UK.”

At the Grantley Stable Neonatal Unit, Royal Brisbane and Women’s Hospital, percutaneously inserted silicone central venous catheters have been used for delivery of parenteral nutrition since 1978. We have always aimed for the catheter tip to be in the middle of the right atrium. A computerised database record exists of all babies admitted since 1 May 1983 with basic and clinical data, diagnoses, and managements collected during each patient’s admission.

This paper describes the use of silicone central venous lines (CVLs) at Royal Brisbane and Women’s Hospital. Specifically addressed are the occurrence of pleural and pericardial effusions, septicaemia, and the reasons for line removal.

METHODS

The neonatal database was examined for all infants admitted from 1 January 1984 until 31 December 2002 who had a CVL. The database before 1 January 1996 recorded babies having a CVL, and total CVL days. From 1 January 1996, the dates of insertion and removal of each catheter, insertion site, tip position, removal reason, and organism grown from tip (all tips are cultured after removal) were also recorded. For all time periods, complications that were not a removal reason were recorded as miscellaneous diagnoses. These were examined for the occurrence of pericardial effusion and pleural effusion. Lines removed for suspected infection, later proven to be septicaemia, are reclassified as being removed for septicaemia. If the baby died, and was also septicaemic, reason for removal is classified as death+septicaemia.

Data before 1 January 1996 were completed from three sources:

  1. Original data abstraction sheets recording dates of insertion and removal were examined to retrieve these dates for individual catheters.

  2. From mid-1983 until mid-1991, an additional paper record of all CVLs had been kept (personal interest), containing dates of insertion and removal, tip position, reason for removal, and tip culture.

  3. For babies admitted between mid-1991 and 31 December 1995, data relating to tip position and reason for removal were completed by examination of about 500 charts. Fifteen could not be located.

Autopsy reports of all babies who died with a catheter in place were reviewed.

RESULTS

Between 1 January 1984 and 31 December 2002, there were 18 761 admissions to the neonatal unit, of whom 1862 had a CVL. There were 2186 catheters for a total of 35 159 days (median 14 days per catheter). The longest life of any individual catheter was 99 days. Table 1 lists catheter use by birth weight groups for these babies, whose birth weights ranged between 340 g and 5320 g, and whose birth gestational ages were between 22 weeks 6 days and 42 weeks 3 days. In the same time period, there were 19 surgically placed central venous catheters, and 11 percutaneously inserted non-silicone central venous catheters, which are not the subject of this report, except to say that none of these had pericardial or pleural effusion as a complication.

Table 1

 Central venous lines inserted 1 January 1984 to 31 December 2002

Records showed that 1282 (58.6%) catheters had their tip position in the right atrium. A total of 142 babies (7.6% of babies, 6.6% of catheters) died with a CVL in place, and the records show that in 89 (4.8% of babies) of these the catheter tip was in the right atrium. Thirty two of the 89 babies who died with a line tip in the right atrium, and 20 of the remainder, had an autopsy. Nine autopsies in the right atrial group (27%) reported some straw coloured fluid in the pericardial cavity, all in the context of generally oedematous babies. None reported tension in the pericardium or milky fluid consistent with parenteral nutrition having been infused there. Seven autopsies in the non-right atrial group (35%) reported fluid in the pericardial cavity, none under tension and all straw coloured. Macroscopic and microscopic examination of the myocardium in each case did not reveal any localised abnormality, as would occur with a catheter complication.

One case (0.05% of catheters) of pericardial effusion was identified in a baby whose catheter tip was recorded as being in the right atrium. At the time the catheter was actually curled in the right atrium, with its tip wedged in the right atrial–right ventricular junction, and had not been sufficiently pulled back after radiographic examination. It was pulled back when the baby had a pulmonary haemorrhage the night after catheter insertion. Pericardial effusion was found on echocardiographic examination two days later.

There were no cases of pleural effusion related to CVL use.

Table 2 lists reasons for catheter removal. Most (1523, 69.7%) were removed electively (no longer needed). The greatest chance of elective removal was for catheters with the tip recorded as being in the right atrium (77.8% of 1282), with the next being for catheters with the tip recorded as being in the superior vena cava (76.6% of 239). There was a 50% chance or less of elective removal of catheters with the tip in the subclavian vein or a limb vein.

Table 2

 Reasons for central venous line removal (1 January 1984 to 31 December 2002)

Of the 142 babies whose catheters were removed because the baby died, 23 were septicaemic at the time. A further 71 catheters were removed after the diagnosis of septicaemia or because of suspected infection later proven to be septicaemia—that is, 94 catheters (4.25%) were removed for septicaemia with or without death. It is unit practice to remove catheters after a diagnosis of septicaemia. This practice, however, has not been strictly adhered to over the past five years, resulting in 22 cases of septicaemia being treated with the catheter remaining in. There were therefore 116 catheters where septicaemia occurred during the life of the catheter (5.3%). From 1 January 1996 to 31 December 2002, the dates of all septicaemic episodes were recorded, allowing analysis of catheter related blood stream infection (CRBSI) as the number of instances of septicaemia occurring at least 48 hours after placement of a catheter or within 48 hours after removal of the catheter. In this time period, there were 72 instances of CRBSI (3.82/1000 line days). The highest risk group for CRBSI was babies of < 750 g birth weight (30 instances, 8.2% of catheters, 8.62/1000 line days), followed by those of 750–999 g birth weight (19, 3.2%, 3.53/1000 line days). The lowest incidence of CRBSI was in babies of 1000–1499 g birth weight (10, 1.5%, 1.7/1000 line days), and a slightly higher incidence was seen in babies of ⩾ 1500 g birth weight (13, 2.4%, 3.07/1000 line days).

Coagulase negative staphylococci (24.3% of organisms) predominated among organisms causing septicaemia (table 3). Methicillin resistant Staphylococcus aureus (MRSA) was prominent in the period 1987–1991 when colonisation with MRSA was endemic in our nursery, but after its elimination in 1991,29 MRSA septicaemia has occurred only twice (1995 and 2001). There were only five cases of Candida septicaemia while a CVL was in place. Two of these were in babies of < 1000 g birth weight. No fungomas were seen. Prophylaxis with oral and topical nystatin was introduced in 1980 after a number of cases of Candida septicaemia in 1979–1980, most associated with peripheral parenteral nutrition delivery.

Table 3

 Organisms that caused septicaemia (n = 116)

There was only one case of endocarditis (S aureus).

Apart from the case of pericardial effusion noted above, there was one other life threatening complication in the occurrence of neck oedema with respiratory obstruction a few hours after catheter insertion, requiring endotracheal intubation and catheter removal. The catheter tip had extravasated into the neck.

DISCUSSION

This is the largest series of percutaneously inserted silicone central venous catheters reported. It highlights that in the Royal Brisbane and Women’s Hospital, where catheters are electively positioned with their tip in the right atrium, these catheters are very safe, and are associated with low complication rates. It also highlights the value of keeping prospective data on such catheters. If we do not do this, it may well be imposed on us.28

The two most important complications of these catheters are septicaemia and pericardial or pleural effusions. The 5.3% incidence of septicaemia reported here is in the lower range of reported rates, which vary from 0 to 46%.30–39 Only two of the five cases of septicaemia caused by Candida sp in this series occurred in 959 catheters (0.2%) in babies of < 1000 g birth weight. This compares favourably with a report40 describing the use of fluconazole to reduce fungal colonisation and septicaemia in extremely low birthweight babies with central venous catheters. Fungal (Candida) colonisation was reduced from 60% to 22%, and invasive Candida infection from 20% to 0% in 50 patients. Candida septicaemia has been very uncommon since the introduction of fungal prophylaxis, which has not been subjected to controlled trial. A trial of oral nystatin alone in 67 infants of < 1250 g birth weight showed it to be effective in reducing infection and mortality.41 CRBSI is an unavoidable risk given that babies in whom a CVL is used are immunocompromised by virtue of extreme prematurity or at high risk of infection because of gastrointestinal complications. When septicaemia occurs, it is often clear that the catheter was not the source of infection, but it is proper to include all in the CRBSI rate calculation as “catheter related”. It is likely that the reason behind the higher incidence of CRBSI in larger babies is that such babies have different indications for CVL insertion—more likely to have serious abdominal pathology or surgery. The data on CRBSI by birth weight groups compare favourably with data from the National Nosocomial Infections Surveillance systems.42

Significant recently has been the question of pericardial effusion and consequent cardiac tamponade, reported in 1–3%10 of babies with a CVL, with a 30–50% mortality. It is most commonly reported with catheter tips thought to be in the right atrium. In some, a catheter tip thought to have been in the right atrium has been shown to have been elsewhere, such as the right ventricle,11 or looped in and caught up against the wall of the right atrium.3,6 Some authors describe migration of catheter tips4,7,14 from initial positions outside the cardiac chambers, with two of those reports4,7 not describing catheter fixation methods. The third14 describes a fixation method that seems inherently likely to allow catheter migration. These instances highlight the difficulty sometimes experienced in locating catheter tips, particularly when “radio-opaque” catheters are inserted and plain radiography alone is used for tip localisation.43 In fact, I believe this complication has only ever been reported with the use of “radio-opaque” catheters; perhaps the need to contrast inject radiolucent catheters is protective against it. No cases of cardiac tamponade were identified associated with the 1281 catheters with their tips located appropriately in our intended right atrial location. One catheter inappropriately left looped in the right atrium with its tip wedged at the edge of the tricuspid valve was associated with pulmonary haemorrhage and bradycardia eight hours after insertion as described above.

In response to reports of death from cardiac tamponade, some catheters now bear a manufacturer’s recommendation that they not be placed with the tip in the right atrium. The UK Department of Health has made similar recommendation,28 and the US Food and Drug Administration implicitly so by posting a paper recommending placement of CVL tips outside the heart on their website.44 This complication has, however, been described for catheters with tips located outside the heart.12 Why has it not been seen in this series? The most obvious possible explanation is that it has in fact occurred, but has not been identified. Every effort has been made to ensure that this is not the case. In addition, the occurrence of cardiac tamponade is dramatic, not to escape notice, to be both recorded and remembered. Complications of managements are rigorously recorded at the time they occur, and the database search methods used would reveal these.

Our preferred catheter has been the “original” epicutaneo cave catheter (2184.06; Vygon, Uppsala, Sweden), which is not visible on plain radiograph, and so requires radio-opaque contrast injection for localisation (that catheter is no longer available, as ISO standard 10555-3 now requires all such catheters to be radio-opaque). The insertion site is dressed with a “bio-occlusive dressing” (Johnson & Johnson, Piscataway, New Jersey, USA), not disturbed during the life of the catheter unless soiled or at risk of coming off (very rare). No steri-strips are used. The catheter is brought straight out from under the dressing, avoiding the possibility of inward migration. Strict insertion and management principles for CVLs (table 4) may add to their safety. Most important to us are restricting operators to experienced personnel, and ensuring that blood can be readily and repeatedly withdrawn from the catheter where it will be left at the completion of insertion, to ensure it is in a large vessel and is not lodged against a vessel or cardiac chamber wall. Instructions packaged with one catheter (epicutaneo cave radio-opaque 2184.00; Vygon) state that blood should not be withdrawn during the insertion. I strongly disagree with this recommendation. Crucial also is the practice of contrast injection for tip localisation. Even when radio-opaque catheters are used, we always inject the catheter for tip localisation, as described by Shaw,1 and reaffirmed by Reece et al,43 Chandran and Chong,45 and Makwana et al.46 Injection continues during radiographic exposure, leaving a blush of contrast visible at the catheter tip. There is then no doubt as to the location of the catheter tip. A catheter caught in interstices within the heart, such as against the right atrial wall, is very visible, as are unusual positions such as the ascending lumbar vein (fig 1) or small vessels near the superior vena cava (fig 2). This could be thought to be satisfactorily positioned in the superior vena cava if a radio-opaque catheter were used with plain radiography only. Contrast injection can also alert to abdominal wall vein positioning (fig 3), recently reported to have caused hypoglycaemia and an incorrect diagnosis of necrotising enterocolitis.20 Catheters in the ascending lumbar vein have been associated with serious morbidity and mortality,24–26 but are easily identified by contrast injection. Since August 2000, we have used digital computed radiography which has also been reported to enhance tip localisation.47

Table 4

 Insertion and management principles

Figure 1

 Distinctive pattern of dye in paravertebral veins. Central venous line with tip curled in the right ascending lumbar vein. Reprinted with permission from Cartwright D, J Paediatr Child Health 2004;40:332–3.

Figure 2

 Central venous line tip in the small vein near the superior vena cava—this may be in the vasa vasorum of the superior vena cava. It would not be a good place to infuse parenteral nutrition solutions. If not injected, this line would appear to be in a satisfactory position.

Figure 3

 Central venous line tip in an anterior abdominal wall vein, easily determined when the catheter is injected with radio-opaque dye.

What is already known

  • Percutaneously inserted central venous catheters are regarded as life saving in providing nutrition to small neonates

  • Pericardial effusion and cardiac tamponade have been reported in 1–3% of neonates having such a catheter, with death in 30–50% of cases

  • Septicaemia has been reported in up to 46% of neonates having such a catheter

In this unit, CVLs are not routinely used for drug injections. All line changes, routinely three times a week, are done with full surgical scrub by the operator, with a mask being worn by the assistant. If an infusion is to be added, the same rigorous principles are followed in setting it up. Very occasionally a CVL will be used for antibiotic treatment. The same infusion set up procedures are used, and a number of doses of antibiotic are set up on the line to be infused when required by turning a three way tap, minimising line breaks.

What this study adds

  • Only one case of pericardial effusion, non-lethal, was seen in 2186 catheters, and that in a catheter shown to be incorrectly positioned and not properly adjusted

  • No cases of catheter associated pleural effusion were seen

  • Septicaemia occurred associated with 5.3% of catheters. Infection risks are greatest with the smallest babies

  • The use of percutaneously inserted central venous catheters is safe, in a unit where strict management guidelines are followed, including the demonstration of catheter tip position by contrast radiography

This analysis of our CVL dataset endorses the safety of placing catheter tips in the right atrium with contrast injection localisation, and illustrates the value of keeping records of all intravascular catheters as suggested in the Manchester Report.28

Acknowledgments

I acknowledge the assistance of Dr Mark Davies in reviewing the manuscript, and of medical student Ms Penny Reimers who assisted in chart review.

REFERENCES

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