IMPACT OF SUDDEN INCREASES IN INTRA-ABDOMINAL PRESSURE ON HEMODYNAMICS AND MYOCARDIAL FUNCTION IN MILITARY PATIENTS

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ABSTRACT

Intra-abdominal pressure (IAP) is a critical physiological parameter that influences multiple organ systems, particularly

in patients who have sustained trauma or undergone surgery. This study investigates the impact of sudden increases

in intra-abdominal pressure on hemodynamics and myocardial function in military patients, particularly those

experiencing abdominal trauma or undergoing abdominal surgery in combat settings. Elevated IAP, often resulting

from trauma, fluid accumulation, or surgical procedures, can significantly affect cardiovascular stability, leading to

alterations in cardiac output, blood pressure, and myocardial contractility. Through a retrospective review of military

patients treated for abdominal injuries or surgeries, this study assesses the physiological changes in hemodynamics

and myocardial function associated with acute IAP elevations. Key variables such as heart rate, blood pressure, central

venous pressure, and echocardiographic measures of myocardial performance were monitored. The findings reveal

that sudden increases in IAP result in significant hemodynamic instability, including reduced cardiac output and

increased central venous pressure, as well as impaired myocardial contractile function. These changes are more

pronounced in patients with severe abdominal trauma or those undergoing complex surgeries. The study underscores

the importance of early detection and management of elevated IAP in military healthcare settings, where rapid

intervention can prevent complications such as multi-organ dysfunction, ischemia, and even death. The results

highlight the need for targeted strategies to monitor and mitigate the effects of IAP elevations on cardiovascular and

myocardial function in military patients.

Research Article

IMPACT OF SUDDEN INCREASES IN INTRA-ABDOMINAL PRESSURE ON
HEMODYNAMICS AND MYOCARDIAL FUNCTION IN MILITARY
PATIENTS

Submission Date:

October 29, 2024,

Accepted Date:

November 03, 2024,

Published Date:

November 30, 2024

Crossref doi:

https://doi.org/10.37547/ajbspi/Volume04Issue11-04

Farida Azizova

Center For Development Of Professional Qualification Of Medical Workers, Tashkent, Uzbekistan

Journal

Website:

https://theusajournals.
com/index.php/ajbspi

Copyright:

Original

content from this work
may be used under the
terms of the creative
commons

attributes

4.0 licence.

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KEYWORDS

Intra-abdominal pressure, hemodynamics, myocardial function, military patients, abdominal trauma, surgery, cardiac

output, central venous pressure, echocardiography, organ dysfunction, cardiovascular instability, multi-organ failure,

trauma management.

INTRODUCTION

Intra-abdominal pressure (IAP) is a critical parameter in

assessing the physiological status of patients,

especially those who experience abdominal trauma or

undergo surgery. Elevated intra-abdominal pressure,

often resulting from conditions such as trauma,

surgery, or fluid accumulation, can lead to a variety of

systemic consequences, including hemodynamic

instability and impaired myocardial function. These

effects are particularly concerning in military patients,

who are often exposed to traumatic injuries in combat

situations or undergo emergency surgical procedures

in resource-limited environments. This study examines

the impact of sudden increases in IAP on

cardiovascular function, specifically focusing on

hemodynamics and myocardial performance in military

patients.

Military personnel are at higher risk of developing

elevated intra-abdominal pressure due to the nature of

their injuries, which often include abdominal trauma

from blast wounds, gunshot injuries, and blunt force

trauma. Abdominal surgeries such as exploratory

laparotomies, bowel resections, and hemostatic

procedures are common in military settings, further

contributing to the potential for IAP increases. The

physiological consequences of these pressure

elevations are poorly understood in military

populations, and this study aims to fill this gap by

analyzing the effects of IAP increases on hemodynamic

parameters and myocardial function.

METHODOLOGY

This study is a retrospective review of medical records

from military personnel who sustained abdominal

trauma or underwent abdominal surgery between 2015

and 2020. The study population included patients aged

18-50 who had either blunt or penetrating abdominal

trauma or those who underwent abdominal surgeries

in military hospitals or field medical units. The inclusion

criteria also required that patients were monitored for

intra-abdominal pressure (IAP) during their treatment,

with a particular focus on those whose IAP exceeded

12 mmHg, a threshold for IAH (Intra-Abdominal

Hypertension). Hemodynamic parameters, including

heart rate, blood pressure, central venous pressure

(CVP), and cardiac output, were recorded. Additionally,

echocardiographic measurements of myocardial

contractility and ventricular function were used to

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assess myocardial performance in relation to IAP

elevations.

The primary aim was to determine the physiological

effects of acute IAP increases on myocardial function

and cardiovascular stability. Secondary outcomes

included the incidence of multi-organ dysfunction, the

length of ICU stay, and mortality rates associated with

elevated IAP.

RESULTS

A total of 150 military patients met the inclusion criteria

for this study. These patients had sustained abdominal

trauma or undergone abdominal surgeries in military

hospitals or field medical units between 2015 and 2020.

Of the total cohort, 45 patients (30%) developed intra-

abdominal hypertension (IAH), defined as an intra-

abdominal pressure (IAP) greater than 12 mmHg. The

prevalence of IAH was notably higher in patients who

sustained penetrating trauma, with 40% of those

patients developing IAH. In comparison, 25% of

patients who sustained blunt trauma exhibited

elevated IAP. This finding is consistent with previous

studies that have documented a higher incidence of

IAH in patients who experience more severe

abdominal injuries, especially those resulting from

penetrating trauma (Hughes et al., 2020). Penetrating

trauma often results in significant abdominal organ

injury, bleeding, and fluid accumulation, all of which

can increase IAP and elevate the risk for developing

IAH.

The majority of IAH cases in the study population

developed within the first 48 hours following trauma

or surgery. This finding is significant, as it highlights the

critical post-trauma or post-surgery period when IAP is

most likely to increase. These early increases in IAP can

cause a cascade of physiological changes that lead to

complications such as multi-organ dysfunction and

hemodynamic instability. Monitoring IAP during this

window of time is essential for early detection and

intervention. The critical post-surgical or post-trauma

period is often the most challenging for healthcare

providers, especially in military settings where rapid

interventions are crucial due to limited resources and

the nature of the injuries sustained.

Among the patients who developed IAH, significant

hemodynamic changes were observed. A reduction in

cardiac output was noted in 60% of the patients. This

decrease in cardiac output is a major concern, as it can

lead to inadequate tissue perfusion, hypoxia, and

ischemia in vital organs. The reduction in cardiac

output was accompanied by an increase in central

venous pressure (CVP) in 55% of the patients. Elevated

CVP indicates impaired venous return, which can be

caused by increased IAP compressing major blood

vessels such as the inferior vena cava, reducing the

ability of the heart to receive sufficient blood flow from

the systemic circulation (Al-Mujadi et al., 2019). The

compromised venous return results in reduced

effective

circulating

blood

volume,

further

exacerbating the patient’s hemodynamic instability.

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In addition to the hemodynamic alterations,

myocardial function was also significantly impacted in

patients with IAH. Myocardial contractility, as assessed

using echocardiographic techniques, was reduced in

50% of the patients. This suggests that elevated IAP not

only impairs venous return but also exerts a direct

negative effect on the heart’s ability to contract

effectively.

Reduced

myocardial

function

can

exacerbate the decline in cardiac output and worsen

overall cardiovascular stability. Myocardial dysfunction

in patients with IAH is an important factor contributing

to the multi-organ dysfunction often seen in this

population.

The occurrence of multi-organ dysfunction (MOD) was

notably high in patients with IAH, with 70% of these

patients experiencing at least one organ failure. Renal

failure was the most common complication, affecting

50% of patients with IAH. The kidney is particularly

vulnerable to elevated IAP because increased intra-

abdominal pressure can compress the renal

vasculature and impair renal perfusion, leading to

acute kidney injury (Behrens et al., 2018). Respiratory

distress was observed in 30% of patients with IAH,

which can be attributed to the mechanical effects of

elevated IAP on the diaphragm, reducing lung

compliance and restricting normal respiratory

function. In more severe cases, patients required

mechanical ventilation to support their breathing.

Cardiac

instability,

including

arrhythmias

and

hypotension, was observed in 15% of patients with IAH,

further contributing to the morbidity and mortality

associated with this condition. The development of

MOD in these patients underscores the critical

importance of managing IAH early to prevent organ

failure and reduce the risk of mortality.

The mortality rate in patients with IAH was 15%,

significantly higher than the 5% observed in patients

without IAH. This stark difference in mortality rates

highlights the severity of IAH and the potential for IAH

to worsen clinical outcomes in military personnel, who

may already be dealing with complex trauma and

limited medical resources. The higher mortality rate in

patients with IAH suggests that, if left untreated, the

condition can lead to irreversible organ damage and

death, particularly in cases of multi-organ failure. This

further emphasizes the importance of early detection,

continuous monitoring, and rapid intervention for

patients at risk of IAH.

Furthermore, patients who developed IAH required an

average of 10 additional days in the intensive care unit

(ICU) compared to those without IAH. This extended

ICU stay not only increases the burden on healthcare

resources but also increases the risk of complications

associated with prolonged hospitalization, such as

infections, pressure ulcers, and sepsis. The prolonged

ICU stay for patients with IAH underscores the need for

prompt and effective treatment to prevent

complications that lead to longer recovery times and

increased healthcare costs.

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Surgical interventions, particularly decompressive

laparotomies, were performed in 50% of the patients

who developed IAH. Decompressive laparotomy,

which involves the surgical release of pressure within

the abdomen, is an effective treatment for reducing

elevated IAP and restoring normal hemodynamics. In

this study, decompressive laparotomies resulted in

significant improvements in both hemodynamic

stability and myocardial function. Patients who

underwent this procedure demonstrated reductions in

IAP, improvements in cardiac output, and stabilization

of CVP. These results are consistent with the literature,

which supports decompressive laparotomy as an

effective treatment for managing IAH and preventing

the progression to abdominal compartment syndrome

(ACS) (Hughes et al., 2020). However, the findings also

suggest that decompressive surgery should not be the

first line of defense for managing IAH. Instead, regular

monitoring of intra-abdominal pressure and non-

invasive interventions should be prioritized to prevent

the need for surgical intervention.

Prevalence of Intra-Abdominal Hypertension (IAH) in Military Personnel

This pie chart represents the percentage of military patients who developed intra-abdominal hypertension (IAH)

versus those who did not, as observed in the study.

DISCUSSION

The findings of this study confirm that sudden

increases in intra-abdominal pressure (IAP) have a

profound

and

detrimental

impact

on

both

hemodynamics and myocardial function in military

patients. The observed significant reduction in cardiac

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output and impaired myocardial contractility in

patients with intra-abdominal hypertension (IAH) point

to the ways in which elevated IAP disrupts normal

cardiovascular physiology. This disruption impairs the

heart’s abil

ity to pump effectively, compromising the

maintenance of stable blood pressure and adequate

tissue perfusion. These physiological changes are

particularly concerning in military personnel, who are

often exposed to traumatic injuries and complex

abdominal surgeries, both of which exacerbate the

risks associated with elevated IAP.

In combat-related injuries, where trauma to the

abdominal cavity can result in significant blood loss,

organ damage, and rapid onset of intra-abdominal

inflammation, the ability to effectively manage IAH

becomes critical. Additionally, military personnel often

face

these

challenges

in

resource-limited

environments, where rapid decision-making and

intervention are essential to improve survival

outcomes. The increased prevalence of IAH in this

cohort of patients further highlights the need for early

detection and prompt intervention. In the military

context, where patients may be subjected to blast

injuries, gunshot wounds, or other severe abdominal

trauma, the risk of IAH is significantly heightened due

to the nature of the injuries.

A particularly concerning finding in this study was the

development of multi-organ dysfunction (MOD) in 70%

of patients with IAH. Renal failure, respiratory distress,

and cardiac instability were the most common

complications of IAH, and they contributed

significantly to the increased morbidity and mortality

observed in this patient group. The kidneys are

especially vulnerable to changes in intra-abdominal

pressure, as elevated IAP impairs renal perfusion by

compressing renal vasculature. Renal failure was the

most frequent complication, affecting 50% of IAH

patients, and it is often associated with the need for

renal replacement therapy, including dialysis, which

significantly complicates patient recovery and extends

ICU stays. Respiratory distress, occurring in 30% of IAH

patients, is another common and serious complication.

As IAP rises, it impedes diaphragmatic movement,

reduces lung compliance, and can cause atelectasis or

hypoxemia, necessitating mechanical ventilation in

some cases. Additionally, 15% of patients with IAH

experienced cardiac instability, including arrhythmias

and hypotension. The elevated pressure within the

abdominal cavity can affect venous return, impeding

the heart’s ability to mainta

in adequate cardiac output

and

potentially

resulting

in

life-threatening

arrhythmias.

The increased mortality rate among patients with IAH

was 15%, compared to just 5% in those without IAH,

highlighting the severity of the condition and its direct

impact on patient outcomes. This stark difference in

mortality underscores the need for timely recognition

and management of IAH. Early intervention can reduce

the risk of multi-organ failure, improve cardiovascular

stability, and potentially lower mortality. These

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findings align with previous studies showing that IAH,

if not managed promptly, can lead to significant

complications, including ACS (Al-Mujadi et al., 2019),

and that patients who develop IAH require more

extensive resources and care, resulting in prolonged

ICU stays and higher overall healthcare costs (Behrens

et al., 2018).

Interestingly, while decompressive laparotomy

—

surgical release of intra-abdominal pressure

—

was

effective in improving patient outcomes, it should not

be considered the first-line treatment for IAH. The

findings suggest that regular monitoring of IAP,

particularly in the first 48 hours after trauma or

surgery, is critical for early detection and intervention.

Non-invasive methods, such as bladder pressure

measurements, are effective for assessing IAP in real-

time and should be routinely employed in patients at

high risk of developing IAH. Early medical interventions

aimed at reducing IAP, including fluid management,

pharmacologic agents to optimize hemodynamics, and

minimal-volume ventilation strategies, can prevent the

progression to abdominal compartment syndrome

(ACS) and multi-organ dysfunction. These methods are

preferable to decompressive surgery, which carries

additional risks such as infection, bleeding, and wound

dehiscence.

Given the high incidence of IAH and its impact on

hemodynamics and myocardial function in military

patients, the findings emphasize the need for

enhanced training of military medical personnel in

recognizing the early signs of IAH. Rapid intervention,

especially in combat zones where abdominal injuries

are frequent, could significantly improve patient

outcomes. Military medical personnel should be

equipped with the knowledge and tools to identify IAH

early, including using non-invasive methods to monitor

IAP

and

assess

hemodynamic

parameters.

Standardized protocols for monitoring and managing

IAP should be established and implemented across

military healthcare settings, including field hospitals

and intensive care units. This would help in identifying

patients at risk and ensuring timely interventions,

which can mitigate the impact of IAH on organ function

and recovery.

The adoption of these protocols, combined with

increased training for military medical staff, could

reduce the burden of IAH on military healthcare

resources. Proactive measures such as early detection,

continuous monitoring, and the administration of

timely

medical

interventions

—

including

both

pharmacological and surgical strategies

—

could

significantly reduce the incidence of multi-organ

dysfunction, improve recovery times, and reduce

mortality

in

military

personnel.

Moreover,

implementing these practices could contribute to

more efficient healthcare delivery, reducing the strain

on military hospitals and ICU beds, which are often

limited during periods of high combat or medical

emergency. Furthermore, timely management of IAH

could lead to better preservation of organ function,

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lessening the need for costly and invasive procedures

and potentially enabling military personnel to return to

duty more quickly.

Study Results on Intra-Abdominal Hypertension in Military Patients

Complication/Condition

Percentage (%)

Notes

Penetrating Trauma

40%

Higher incidence in

patients with penetrating
trauma

(gunshot,

blast

wounds)

Blunt Trauma

25%

Lower incidence in

patients with blunt trauma
(e.g., car accidents, blunt
force injuries)

Renal Failure

50%

Renal failure was the

most common complication,
requiring dialysis in some
cases

Respiratory Distress

30%

Respiratory distress

observed due to mechanical
effects on the diaphragm,
may require ventilation

Cardiac Instability

15%

Cardiac

instability,

including arrhythmias and
hypotension due to impaired
venous return

Mortality Rate

15%

Higher mortality rate

in

patients

with

IAH

compared to those without
(15% vs. 5%)

CONCLUSION

Intra-abdominal

hypertension

has

significant

hemodynamic and myocardial consequences in

military patients undergoing abdominal surgery or

trauma. The results of this study emphasize the need

for early detection and intervention to prevent multi-

organ dysfunction, prolonged ICU stays, and increased

mortality. Monitoring intra-abdominal pressure,

particularly in the first 48 hours post-surgery or

trauma, is essential to prevent the progression to more

severe

forms

of

IAH,

including

abdominal

compartment syndrome. Decompressive laparotomy

should be considered a last resort, and non-invasive

monitoring techniques should be used to detect IAH

early. By integrating regular monitoring and early

intervention protocols, military healthcare providers

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can improve patient outcomes and reduce the impact

of IAH on the health and readiness of military

personnel.

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