Are current clinical guidelines on the use of Peripheral Intravenous Cannula for blood draws supported by evidence? An organizational case study

Is the Use of Pre-existing Peripheral Intravenous Cannula as an Alternative to Venipuncture for Blood Sampling Being Implemented?

Background

Blood tests are usually obtained by venipuncture which is an insertion of a needle into a vein. Since blood collection is frequently ordered, it contributes to the increased workload on healthcare professionals. Thus, utilization of previously inserted peripheral intravenous lines for blood collection is proposed to decrease the work burden.

Objective

The aim of the study was to make assessment of the awareness and practice of emergency medicine and intensive care unit staff regarding blood sampling via pre-existing peripheral line.

Methods

This is a cross-sectional study used a web-based and self-administered questionnaire. It distributed among emergency department and intensive care unit staff between November 2021 and February 2022.

Results

A total of 95 healthcare providers participated in the study. Most respondents were nurses (n=49, 51.5%) with 58.5% assigned to the intensive care unit. The overall mean awareness score was 1.74 out of 4 points with standard deviation of 1.29. Poor awareness was found among (n=65, 68.4%) and the remaining (n=30, 31.6%) had good awareness. Positive significant association has been observed between the level of awareness and practice (p=0.015). no significant difference was found between the emergency department and intensive care unit staff in terms of awareness level and practice.

Conclusion

Findings from the current study showed variation in participants' views, hence, nurses and other health care providers are left to use their personal preferences in deciding patient care. This highlights the need for establishing institutional policies regarding blood sampling via a pre-existing peripheral intravenous line.

The impact of blood sampling technique, including the use of peripheral intravenous cannula, on haemolysis rates: A cohort study

AIMS

To explore the relationship between blood sampling techniques and haemolysis.

BACKGROUND

Haemolysis rates of blood samples have been thought to be influenced by the method of collection. There is a lack of research evidence available to clearly show the comparative risk of haemolysis across different blood sampling methods, including venepuncture and use of peripheral intravenous cannulas.

DESIGN

A prospective cohort study. Reporting followed the STROBE checklist.

METHODS

A trained observer was used to record blood sampling techniques over a 10-week period between April and June 2019. These records were then linked to pathology haemolysis results. Multivariable logistic regression was used to model patient and blood draw characteristics affecting haemolysis.

RESULTS

Most of the blood samples were not haemolysed (n = 324, 87.1%). Multivariable analysis showed haemolysis was associated with increased tourniquet duration and if the level of tube was less than half full. Univariable analysis showed haemolysis was associated with increased age of the patient, the difficulty of cannulation/ venepuncture and increased number of attempts. No difference was found in the haemolysis rate related to the qualification of the blood collector.

CONCLUSION

There was no significant difference in haemolysis rates associated with sampling blood from a PIVC compared with venepuncture. Research should be undertaken to determine whether education on the factors influencing haemolysis is useful in decreasing haemolysis rates.

RELEVANCE TO CLINICAL PRACTICE

There was no association with increased haemolysis rates when drawing blood via venepuncture compared with a peripheral intravenous cannula. Haemolysis of blood samples was associated with increased tourniquet duration, if level of the tube was less than half-filled, increased age of the patient and difficulty of blood draw. Awareness of the risk of haemolysis associated with specific blood sampling methods may assist clinicians to improve care.