Cuff pressure monitoring by manual palpation in intubated patients: How accurate is it? A manikin simulation study

Endotracheal Cuff-pressure Monitoring in ICU: A Standard of Care Yet to be Standardized, and Often Neglected

How to cite this article: Kumar AKA. Endotracheal Cuff-pressure Monitoring in ICU: A Standard of Care Yet to be Standardized, and Often Neglected. Indian J Crit Care Med 2024;28(1):8-10.

Accuracy of pilot balloon palpation for cuff pressure assessment in small versus large sized tubes: a prospective non-randomized observational study

Pilot balloon palpation is still a commonly used method to evaluate cuff pressure of the endotracheal tube after intubation. This study determined whether the size of the tracheal tube influenced the accuracy of pilot balloon palpation. A prospective observational analysis of 208 patients intubated with an endotracheal tube of internal diameter (ID) 6.0 or 8.0 was conducted. An anesthesiologist judged the cuff pressure by manual pilot balloon palpation, and then measured the cuff pressure with a pressure gauge. Cuff pressure exceeding 20-30 cmH₂O was defined as false recognition. The intracuff pressure was significantly higher in ID 6.0 tube than in the ID 8.0 tube (41.9 ± 18.8 cmH₂O vs. 30.3 ± 11.9 cmH₂O, p < 0.001). The number of patients that were mistakenly perceived to have appropriate cuff pressure by pilot balloon palpation was significantly higher in the ID 6.0 group compared to the ID 8.0 group (85 (81.7%) vs. 64 (61.5%), p = 0.001). Therefore, a smaller tube size may further increase risk of inaccurate measurement by pilot balloon palpation and although pressure gauge is recommended for all sizes to maximize accuracy, groups with increased risk factors should be targeted for standardized use of the pressure gauge.

Methods Used for Endotracheal Tube Cuff Inflation and Pressure Verification in Veterinary Medicine: A Questionnaire on Current Practice

Endotracheal intubation is a routine procedure in veterinary anaesthesia, yet no consensus guidelines exist for endotracheal tube (ETT) cuff inflation and pressure measurement. The aim of this study was to assess current practice of ETT cuff inflation and seal verification in veterinary medicine. An online questionnaire was distributed among veterinary professionals who administer anaesthesia, comprising six demographic and twelve ETT cuff-related questions per species. N = 348 questionnaires were completed. Cuff pressure was measured by 30% of respondents in cats, 32% in dogs and 9% in both farm animals and horses. Anaesthesia diplomates were not more likely to measure cuff pressure than others, except in cats (OR: 1.8; 95% CI: 1.1−2.9). The most frequently selected recommended range of cuff pressure was 20−30 cm H2O, regardless of species, although >30 cm H2O was selected significantly more often in horses compared to dogs, cats and farm animals. The preferred technique to verify cuff seal was minimal occlusive volume in dogs, cats and farm animals, whereas in horses, the preferred method was verification of normal capnogram waveform. ETT cuff pressure measurement remains uncommon in veterinary anaesthesia. The development of consensus recommendations for cuff inflation, including evidence-based target cuff pressure ranges for various species and different ETT models or materials, can help to improve practice.

Comparative evaluation of three methods of endotracheal tube cuff inflation for adequacy of seal

Background and Aims

Intubation with cuffed endotracheal tube (ETT) is common in operation rooms, critical care, and emergency rooms. The pressure exerted by the cuff on the tracheal mucosa can lead to a reduction in blood flow to the tracheal wall and result in mucosal ischemia. There are many methods for ETT cuff inflation. Aim of the study was to compare the cuff pressures and volumes between the three methods of ETT cuff inflation.

Material and Methods

One hundred and twenty patients were randomized into three groups: Group SG (stethescope guided), group AL (audible leak), and group P (palpation). In group SG, the cuff was inflated by auscultating with the bell of the stethoscope over the thyroid cartilage for leak around cuff. In group AL, the cuff was inflated by listening for an audible leak around the cuff with observer's ear 5 cm away from the mouth of the patient. In group P, the cuff was inflated by palpating for a leak over the cricoid and trachea. The adequacy of the cuff seal was compared between the groups by assessing the volumes of additional air needed to stop the leak around the cuff as confirmed by supraglottic capnometry.

Results

The initial volumes needed to inflate the cuff were significantly more in the stethoscope (SG) and hearing (AL) groups than in the palpation (P) group (SG = 5.1 ± 1.4 ml, AL = 4.6 ± 1.6 ml, P = 3.1 ± 0.9 ml; SG and AL vs. P, P < 0.001). Additional cuff volumes required to achieve zero leak around cuff by supraglottic capnometry were 0.85 ± 1 ml in group SG, 1.3 ± 1.1 ml in group AL, and 2.237 ± 0.8 ml in group P (SG vs. P and AL vs. P; P < 0.001).

Conclusion

Out of the auscultation-guided, audible leak-guided, and palpation-guided methods of ETT cuff inflation, the auscultation-guided and audible leak-guided methods achieve significantly better tracheal seal than the palpation-guided method.

Endotracheal Tube Overinflation Leading to Hypoxic Cardiac Arrest: A Case Report and Review of the Literature

Endotracheal tube cuff overinflation has been shown to produce airway obstruction and subsequent ventilatory and hemodynamic compromise. Although rare, this complication is reversible and its prompt identification is paramount. We describe a case of a 68-year-old woman undergoing microlaryngoscopy and vocal cord lesion biopsy, who developed ventilatory failure and cardiac arrest following endotracheal tube overinflation intraoperatively. The patient was successfully resuscitated and was able to be ventilated after endotracheal tube replacement. We present a literature review and evidence-based management insights for endotracheal tube obstruction due to cuff overinflation.

Pulmonary complications and respiratory management in neurocritical care: a narrative review

ABSTRACT

Neurocritical care (NCC) is not only generally guided by principles of general intensive care, but also directed by specific goals and methods. This review summarizes the common pulmonary diseases and pathophysiology affecting NCC patients and the progress made in strategies of respiratory support in NCC. This review highlights the possible interactions and pathways that have been revealed between neurological injuries and respiratory diseases, including the catecholamine pathway, systemic inflammatory reactions, adrenergic hypersensitivity, and dopaminergic signaling. Pulmonary complications of neurocritical patients include pneumonia, neurological pulmonary edema, and respiratory distress. Specific aspects of respiratory management include prioritizing the protection of the brain, and the goal of respiratory management is to avoid inappropriate blood gas composition levels and intracranial hypertension. Compared with the traditional mode of protective mechanical ventilation with low tidal volume (Vt), high positive end-expiratory pressure (PEEP), and recruitment maneuvers, low PEEP might yield a potential benefit in closing and protecting the lung tissue. Multimodal neuromonitoring can ensure the safety of respiratory maneuvers in clinical and scientific practice. Future studies are required to develop guidelines for respiratory management in NCC.

Técnicas y manejo de la presión del cuff en pacientes adultos con vía aérea artificial por fonoaudiólogos en Chile

Estudio descriptivo, observacional y transversal que tiene como objetivo describir el manejo de las presiones y las técnicas de insuflación del cuff empleadas por fonoaudiólogos en Chile en pacientes adultos con vía aérea artificial. La población fue de profesionales con experiencia en la atención de pacientes adultos con vía aérea artificial en instituciones de salud en Chile, mientras que la muestra fue a conveniencia. Se aplicó un cuestionario en línea sobre manejo de presión del cuff en usuarios adultos con vía aérea artificial que contenía variables numéricas y categóricas. Se realizó análisis de datos mediante estadística descriptiva y analítica. El estudio fue aprobado por el Comité Ético Científico de la Universidad del Desarrollo. El 98% de los participantes utiliza técnica objetiva. El 46% usa técnicas subjetivas siendo la más utilizada la de palpación digital. El 54% utiliza técnicas simultáneamente durante la atención de los usuarios. La mediana de la presión mínima usada fue de 25 centímetros de agua y la máxima de 32 centímetros de agua. Hubo diferencia significativa entre las presiones mínimas usadas por los participantes de hospitales públicos tipo 1 versus los de clínicas privadas. Se concluye que los valores mínimos y máximos de presión del cuff reportados por los participantes en Chile podrían ser poco seguros durante la atención de pacientes adultos con vía aérea artificial. Se suma a ello la utilización de técnicas subjetivas. Se sugiere seguimiento de literatura reciente, actualización de protocolos, desarrollo de guía nacional y revisión de protocolos institucionales en otros países.

Effects of Head and Neck Position on Nasotracheal Tube Intracuff Pressure: A Prospective Observational Study

To prevent endotracheal tube-related barotrauma or leakage, the intracuff pressure should be adjusted to 20-30 cm H₂O. However, changes in the nasotracheal tube intracuff pressure relative to neck posture are unclear. In this study, we investigated the effect of head and neck positioning on nasotracheal tube intracuff pressure. Fifty adult patients with nasotracheal tubes who were scheduled for surgery under general anesthesia were enrolled. Following intubation, intracuff pressure was measured by connecting the pilot balloon to a device that continuously monitors the intracuff pressure. Subsequently, the intracuff pressure was set to 24.48 cm H₂O (=18 mmHg) for the neutral position. We recorded the intracuff pressures based on the patients' position during head flexion, extension, and rotation. The initial intracuff pressure was 42.2 cm H₂O [29.6-73.1] in the neutral position. After pressure adjustment in the neutral position, the intracuff pressure was significantly different from the neutral to flexed (p < 0.001), extended (p = 0.003), or rotated (p < 0.001) positions. Although the median change in intracuff pressure was <3 cm H₂O when each patient's position was changed, overinflation to >30 cm H₂O occurred in 12% of patients. Therefore, it is necessary to adjust the intracuff pressure after tracheal intubation and each positional change.

Could clinical nursing procedures lead to tracheal cuff pressure drop? A prospective observational study

AIM

To evaluate the dynamic changes in tracheal cuff pressure before and after four clinical nursing procedures including sputum suction, oral care, atomisation inhalation, and turning over, and thus provide references for the adjustment time of cuff pressure in clinical practice.

BACKGROUND

Cuff pressure must be kept within the range of 25-30 cmH₂ O to ensure effective ventilation and prevent aspiration, while maintaining tracheal blood flow perfusion.

DESIGN

A prospective observational study.

METHODS

The cuff pressure of 56 intubated patients was adjusted to 28-30 cmH₂ O. A cuff pressure monitor was used to continuously monitor cuff pressure changes before and after four clinical nursing procedures (sputum suction, oral care, atomisation inhalation, and turning over) and the cuff pressures at various time points were compared. The semi-quantitative cough strength score (SCSS) was used to evaluate cough strength during sputum suction and the effect of cough strength on cuff pressure during sputum suction. This study followed the STROBE checklist for cross-sectional studies.

RESULTS

The cuff pressures during the four clinical nursing procedures of sputum suction, atomisation inhalation, turning over, and oral care, all temporarily increased (p < 0.001) and decreased to varying degrees 20 min later (p < 0.001). Among them, the cuff pressure rose the highest under a state of moderate or strong coughing during sputum suction (78.38 ± 12.13 cmH₂ O) and dropped the most at 20 min after the procedure (21.71 ± 4.80 cmH₂ O).

CONCLUSIONS

The four clinical nursing procedures of sputum suction, atomisation inhalation, turning over, and oral care can all cause different degrees of cuff pressure drop. The decision on whether the cuff pressure needs to be corrected depends on the specific situation.

RELEVANCE TO CLINICAL PRACTICE

During clinical practice, the cuff pressure can be individually corrected according to different clinical nursing procedures, which can increase the qualified rate of cuff pressure and reduce the workload of nurses.

Establishing changes in endotracheal cuff pressure with continuous monitoring in patients undergoing laparoscopic surgery in Trende- lenburg position

Background : After endotracheal intubation, the endotracheal cuff gets inflated to a sufficiently high pressure to prevent air leaking. Placing a patient in Trendelenburg position and establishing a pneumoperitoneum affects the endotracheal cuff pressure. Objectives : Determine the impact of these factors on the endotracheal cuff pressure. Design and setting : This prospective, observational study was conducted in the Catharina Hospital (Eindhoven, the Netherlands). Methods : This study included adult patients undergoing laparoscopic surgery. A routine endotracheal tube was inserted, in which the cuff pressure was continuously monitored. Main outcome measures : The outcome of interest was a change in endotracheal cuff pressure after establishment of a pneumoperitoneum and/ or placing a patient in a Trendelenburg position. Results : 39 patients were included. Cuff pressures in- creased significantly from the moment of pneumo-peritoneum, placing a patient into a Trendelenburg position increased endotracheal cuff pressure and peak pressures even more. The highest endotracheal cuff pressure was 67 cm H2O, the highest registered peak pressure was 35 cm H2O. Conclusion : Both endotracheal cuff pressure and peak pressure increased during laparoscopic surgical procedures with a pneumoperitoneum and the patient placed in Trendelenburg position. Measuring the endo-tracheal cuff pressure only after endotracheal intubation is insufficient and should be repeated during surgery on fixed moments.

Knowledge acquisition and retention among nurses after an educational intervention on endotracheal cuff pressure

BACKGROUND

Nurses play a key role in the proper management of endotracheal tube (ETT) cuff pressure, which is important for patients' safety, so it is vital to improve nurses' knowledge on safe cuff management practices.

AIMS AND OBJECTIVES

This study aimed to evaluate the effectiveness of an educational intervention related to ETT cuff pressure management on improving and retaining critical care nurses' knowledge.

DESIGN

A single group pre-post interventional study was conducted involving 112 registered nurses (RNs) from a 24-bed adult general intensive care unit at a teaching hospital in Malaysia.

METHODS

The educational intervention included a theoretical session on endotracheal cuff pressure management and demonstration plus hands-on practice with the conventional cuff pressure monitoring method. Nurses' knowledge was measured using a self-administered questionnaire pre- and post-intervention. Data were analysed using repeated measure analysis of variance and bivariate analysis.

RESULTS

In this study, 92% of the total number of RNs in the unit participated. A significant difference in mean knowledge score was noted between the pre- (mean = 8.13; SD = 1.53) and post-intervention phases (3 months [mean = 8.97; SD = 1.57) and 9 months post-intervention [mean = 10.34; SD = 1.08), P < .001), indicating significant knowledge acquisition and retention between the phases. Knowledge gained between the pre- and 9 months post-intervention phases significantly differed according to nurses' educational level.

CONCLUSIONS

This study supports existing evidence that ongoing educational interventions are essential to improve nurses' knowledge. However, further exploration is suggested to assess how well this knowledge is translated into clinical practice.

RELEVANCE TO CLINICAL PRACTICE

Regular educational programmes with current updates would enhance nurses' knowledge through proper practice and clinical decision-making skills; this, in turn, would help to standardize cuff management practices.

Measuring endotracheal tube intracuff pressure: no room for complacency

Tracheal intubation constitutes a routine part in the care of critically ill and anaesthetised patients. Prolonged use of endotracheal with inflated cuff is one of the major multifactorial causes of complications. Both under-inflation and over-inflation of cuff are associated with complications. Despite known problems, regular measurement of cuff pressure is not routine, and it is performed on an ad hoc basis.

Endotracheal tube cuff pressure changes during manual cuff pressure control manoeuvres: An in-vitro assessment

BACKGROUND

Endotracheal tube (ETT) cuffs are designed to seal the lower airway for precise ventilation and to protect against ingress of pathogens from the pharyngeal space. Therefore, a minimal continuous cuff pressure must be maintained. Aim of this study was to analyse the course of cuff pressure in an in-vitro model during manual cuff pressure control manoeuvres.

METHODS

An artificial trachea was intubated with an appropriately sized ETT and cuff pressure set to 20 cm H₂ O. Thirty-two experienced ICU nurses each performed six cuff pressure control manoeuvres (three times in two different ETTs) using a manual cuff pressure manometer. Course of cuff pressure from connecting the manometer to disconnecting it from the cuff pilot balloon was recorded using a pressure transducer.

RESULTS

There were 190 cuff pressure control manoeuvres suitable for analysis. In all control manoeuvres a cuff pressure below 20 cm H₂ O was noted. In 20.0% of the control manoeuvres the cuff pressure dropped below 10 cm H₂ O. Cuff pressure drops were mainly caused by initially connecting the manometer to the pilot balloon, less frequently by manipulating the pressure gauge of the manometer. Disconnecting the manometer after the control manoeuvre caused a cuff pressure drop in 78.1% of cases, contributing to a final cuff pressure below 20 cm H₂ O in 31.3% of control manoeuvres.

CONCLUSION

Routine manual cuff pressure control manoeuvres in ETT cuffs result in considerable cuff pressure drops. This may have an impact on silent aspiration of pharyngeal contents passing along the cuff into the lower airway.

Assessing the correct inflation of the endotracheal tube cuff: a larger pilot balloon increases the sensitivity of the 'finger-pressure' technique, but it remains poorly reliable in clinical practice

The pilot balloon palpation (or 'finger-pressure') method is still widely used to assess the endotracheal tube cuff inflation, despite consistent evidence of its poor sensitivity in recognizing cuff overinflation. It was recently speculated that this may be related to the lower wall tension (due to the smaller radius) of the pilot balloon as compared with the cuff, according to Laplace's law. To verify this hypothesis and, secondarily, to assess whether the use of a 'large' pilot balloon (identical to the cuff) increases the reliability of this technique, 62 anesthetists (41 experienced anesthesiologists and 21 residents) were asked to estimate the pressure of a cuff inflated to 88 mmHg into a simulated trachea by feeling both a usual and a modified 'large' pilot balloon. A similar test was repeated at 40 mmHg. After palpation of the usual pilot balloon, only 35% of participants (49% of experienced anesthesiologists and 10% of residents) recognized considerable overinflation (88 mmHg), as compared with 87% of participants (95% of experienced anesthesiologists and 71% of residents) after palpation of the 'large' pilot balloon. Moreover, 89% of participants (85% of experienced anesthesiologists and 95% of residents) believed that pressure was higher in the 'large' balloon than in the normal one. However, only 32% of participants (51% of experienced anesthesiologists and none of residents) recognized slight overinflation (40 mmHg) after feeling the 'large' balloon. The pilot balloon size affects the sensitivity of the 'finger-pressure' technique, but it remains poorly reliable with a larger pilot balloon.

Mask pressure effects on the nasal bridge during short-term noninvasive ventilation

The aim of this study was to assess the influence of different masks, ventilator settings and body positions on the pressure exerted on the nasal bridge by the mask and subjective comfort during noninvasive ventilation (NIV). We measured the pressure over the nasal bridge in 20 healthy participants receiving NIV via four different NIV masks (three oronasal masks, one nasal mask) at three different ventilator settings and in the seated or supine position. Objective pressure measurements were obtained with an I-Scan pressure-mapping system. Subjective comfort of the mask fit was assessed with a visual analogue scale. The masks exerted mean pressures between 47.6±29 mmHg and 91.9±42.4 mmHg on the nasal bridge. In the supine position, the pressure was lower in all masks (57.1±31.9 mmHg supine, 63.9±37.3 mmHg seated; p<0.001). With oronasal masks, a change of inspiratory positive airway pressure (IPAP) did not influence the objective pressure over the nasal bridge. Subjective discomfort was associated with higher IPAP and positively correlated with the pressure on the skin. Objective measurement of pressure on the skin during mask fitting might be helpful for mask selection. Mask fitting in the supine position should be considered in the clinical routine.