Mara Klibus

Dr. Mara Klibus


Research Focus & Metrics

Academic Career Length

4Years (2023-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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9 February 2026 in Medicina
Verified
Journal Article
Open access
PDF file
VSViktorija Serova
Viktorija Serova
MKMara Klibus
Mara Klibus
ZMZbignevs Marcinkevics
Zbignevs Marcinkevics
URUldis Rubins
Uldis Rubins
AGAndris Grabovskis
Andris Grabovskis
OSOlegs Sabelnikovs
Olegs Sabelnikovs
Background and Objectives: Septic shock is marked by profound circulatory and cellular dysfunction, with mortality rates of 25–40% despite guideline-based resuscitation. Normalization of macrohemodynamic variables often fails to restore tissue perfusion, a concept known as hemodynamic incoherence. Persistent microcirculatory dysfunction is associated with organ failure and poor outcomes, underscoring the limitations of systemic monitoring alone. This focused narrative review synthesizes current evidence on microcirculatory monitoring in septic shock, with emphasis on bedside and emerging optical technologies, and evaluates their role as adjuncts to traditional hemodynamic assessment for perfusion-targeted resuscitation. Materials and Methods: A concept-driven search of PubMed/MEDLINE (January 2015 to January 2026) was performed, incorporating MeSH and free-text terms for septic shock, microcirculation, hemodynamic coherence, and monitoring modalities. Foundational pre-2015 studies were included for context. Articles were screened using predefined inclusion/exclusion criteria to minimize bias, with thematic qualitative synthesis. A PRISMA-inspired flow diagram was used to summarize the study selection process. Results: Microcirculatory alterations in septic shock include reduced functional capillary density, perfusion heterogeneity, and impaired oxygen extraction, persisting despite macrohemodynamic correction. Bedside markers, such as capillary refill time (CRT) and mottling, track microvascular recovery more closely than lactate. When used to guide resuscitation, CRT-based strategies show a non-significant mortality trend in randomized evaluation, with later studies reporting benefit in composite clinical outcomes. Optical technologies offer non-invasive insights: photoplethysmography (PPG) and perfusion index (PI) show prognostic value and early detection of incoherence; automated CRT (aCRT) enhances reproducibility; advanced modalities, such as laser speckle contrast imaging (LSCI), near-infrared spectroscopy (NIRS), and sublingual videomicroscopy, provide detailed physiological data but face standardization challenges. Recent interventional evidence, including peripheral perfusion-targeted RCTs, supports improved outcomes, though large-scale trials remain limited. Conclusions: Microcirculatory monitoring provides complementary, physiologically relevant information to macrohemodynamic assessment in septic shock. Emerging bedside tools, such as PI and aCRT, are poised for routine use, while multimodal integration may enable personalized management. Future research should prioritize standardization, AI-driven analysis, and randomized trials to confirm outcome benefits.

19 March 2025 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
DSDarja Smirnova
Darja Smirnova
RSRihards Seržāns
Rihards Seržāns
MKMara Klibus
Mara Klibus
VLValdis Liguts
Valdis Liguts
ALAnna Lece
Anna Lece
OSOlegs Sabelnikovs
Olegs Sabelnikovs
Background/Objectives: Sepsis, a life-threatening condition caused by a dysregulated immune response to infection, is associated with high mortality. Endotoxin and cytokine overload play a crucial role in sepsis-induced organ dysfunction. The Oxiris® membrane, traditionally used as a hemofilter for renal replacement therapy, has demonstrated the capacity to adsorb endotoxins and cytokines. This study investigates the clinical effect during hemoperfusion with the Oxiris® membrane in patients with septic shock and preserved renal function. Methods: We present three adult patients with septic shock who were admitted to the intensive care unit with high vasopressor requirements and elevated inflammatory markers. As they were refractory to standard therapy and renal function was preserved, a 12-hour hemoperfusion session with an Oxiris® membrane was initiated. Hemodynamic parameters, inflammatory biomarkers, and endotoxin concentrations were evaluated before, during, and after hemoperfusion treatment. Results: All patients demonstrated hemodynamic stabilization, with norepinephrine support reduced by 10.3% to 70.0%. Key inflammatory markers decreased significantly, including interleukin-6 (−41.6% to −94.0%), procalcitonin (−29.3% to −49.5%), and C-reactive protein (4.7% to −37.2%). Endotoxin concentrations decreased by 62.0% and 13.6% in two of the three patients. No adverse effects related to hemoperfusion were observed. Conclusions: Hemoperfusion with the Oxiris® membrane effectively reduced vasopressor support, inflammatory markers, and endotoxin concentrations in patients with refractory septic shock. This approach may offer a novel strategy for early immune modulation in sepsis before renal dysfunction occurs. Further studies with larger cohorts are required to validate these findings and determine optimal treatment protocols.

30 January 2026 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
MKMara Klibus
Mara Klibus
VSViktorija Serova
Viktorija Serova
URUldis Rubins
Uldis Rubins
ZMZbignevs Marcinkevics
Zbignevs Marcinkevics
AGAndris Grabovskis
Andris Grabovskis
OSOlegs Sabelnikovs
Olegs Sabelnikovs
Background/Objectives: Septic shock involves severe circulatory and microcirculatory dysfunction and often requires vasopressors to maintain adequate mean arterial pressure (MAP). Conventional monitoring mainly reflects macrocirculation and may not capture changes in vascular tone or microcirculation. Remote photoplethysmography (rPPG) is a contactless optical method that analyzes peripheral pulse waveforms and may offer additional physiological insight during vasopressor therapy. The aim of this study was to assess the feasibility of rPPG for detecting pulse waveform changes associated with norepinephrine administration in septic shock. Methods: Prospective case series included three adult patients (n = 3) with septic shock admitted to the intensive care unit at Pauls Stradins Clinical University Hospital, Riga, Latvia. All patients received standard sepsis treatment, including fluid resuscitation and titrated norepinephrine to maintain MAP ≥ 65 mmHg. Continuous invasive arterial pressure monitoring was performed alongside rPPG signal acquisition from the palmar skin surface under controlled lighting. From averaged rPPG waveforms, perfusion index (PI), dicrotic notch amplitude (c-wave), and diastolic wave amplitude (d-wave) were extracted. Correlations between norepinephrine dose, MAP, and rPPG parameters were explored. Results: Increasing norepinephrine doses were associated with higher MAP and PI in all patients. Dicrotic notch and diastolic wave amplitude decreased consistently. These changes occurred alongside macrocirculatory stabilization and are consistent with increased vascular tone and altered arterial compliance. Conclusions: rPPG demonstrated feasibility for detecting pulse waveform changes during norepinephrine therapy in septic shock; however, larger controlled studies are required for validation.

8 February 2025 in Preprints.org
Verified
Preprint
Open access
PDF file
DSDarja Smirnova
Darja Smirnova
RSRihards Seržāns
Rihards Seržāns
MKMara Klibus
Mara Klibus
VLValdis Liguts
Valdis Liguts
ALAnna Lece
Anna Lece
OSOlegs Sabelnikovs
Olegs Sabelnikovs
Background and Objectives: Sepsis, a life-threatening condition caused by a dysregulated immune response to infection, is associated with high mortality. Endotoxin and cytokine overload play a crucial role in sepsis-induced organ dysfunction. The Oxiris® membrane, traditionally used as a hemofilter for renal replacement therapy, has demonstrated the capacity to adsorb endotoxins and cytokines. This study investigates the clinical effect during hemoperfusion with the Oxiris® membrane in patients with septic shock and preserved renal function. Materials and Methods: We present three adult patients with septic shock who were admitted to the intensive care unit with high vasopressor requirements and elevated inflammatory markers. As they were refractory to standard therapy and renal function was preserved, a 12-hour hemoperfusion session with Oxiris® membrane was initiated. Hemodynamic parameters, inflammatory biomarkers, and endotoxin concentrations were evaluated before, during and after hemoperfusion treatment. Results: All patients demonstrated hemodynamic stabilization, with norepinephrine support reduced by 10.3% to 70.0%. Key inflammatory markers decreased significantly, including interleukin-6 (-41.6% to -94.0%), procalcitonin (-29.3% to -49.5%), C-reactive protein (4.7% to -37.2%). Endotoxin concentrations decreased by 62.0% and 13.6% in two of the three patients. No adverse effects related to hemoperfusion were observed. Conclusions: Hemoperfusion with the Oxiris® membrane effectively reduced vasopressor support, inflammatory markers, and endotoxin concentrations in patients with refractory septic shock. This approach may offer a novel strategy for early immune modulation in sepsis before renal dysfunction occurs. Further studies with larger cohorts are required to validate these findings and determine optimal treatment protocols.

16 July 2023
Verified
Book Chapter
Closed access
PDF file
MKMara Klibus
Mara Klibus
VEVeronika Eunapu
Veronika Eunapu
ZMZbignevs Marcinkevics
Zbignevs Marcinkevics
URUldis Rubins
Uldis Rubins
AGAndris Grabovskis
Andris Grabovskis
OSOlegs Sabelnikovs
Olegs Sabelnikovs

31 December 2025 in BMJ Case Reports
Verified
Journal Article
Open access
KRKristiana Paula Ramate
Kristiana Paula Ramate
MAMartins Ansons
Martins Ansons
JSJevgenija Solovjova
Jevgenija Solovjova
MKMara Klibus
Mara Klibus
DSDarja Smirnova
Darja Smirnova
OSOlegs Sabelnikovs
Olegs Sabelnikovs
Postsurgical parotitis is a rare postoperative complication characterised by acute, transient unilateral or bilateral swelling of the salivary glands of unclear origin. This case report aims to analyse the management and causes of postsurgical parotitis. A female patient in her mid-40s was admitted for an elective laparotomy and myomectomy due to a symptomatic uterine myoma measuring 3×4 cm, associated with recurrent metrorrhagia. Her medical history included bulimia nervosa and being moderately underweight. Anaesthetic drugs administered during the induction included fentanyl, propofol and atracurium, and for maintenance included sevoflurane and fentanyl. Intravenous atropine was administered intraoperatively in response to severe bradycardia triggered by uterine stimulation. Following extubation, the patient developed bilateral swelling of the parotid glands. The patient remained stable and did not require respiratory support. Symptomatic management was provided, and the swelling had resolved by the time of the follow-up visit, within 1 week after surgery.