Cardiac resynchronization therapy is not commonly used in the early postoperative period in pati ents undergoing cardiac surgery who have left ventricular (LV) dysfunction and a history of heart failure. We performed a prospective randomized clinical trial to compare atrial synchronous right ventricular (DDD RV) and biventricular (DDD BIV) pacing within 72 hours after cardiac surgery in patients with an EF ≤ 35 %, a QRS interval longer than 120 msec and who had LV dyssynchrony detected by real-time three-dimensional echocardiography (RT3DE). Epicardial pacing was provided by a modified Medtronic INSYNC III pacemaker. An LV epicardial pacing lead was implanted on the latest activated segment of the LV based on RT3DE. The study included 18 patients with ischemic heart diseas e, with or without valvular heart disease (14 men, 4 women, average age 71 years). Patients undergoing DDD BIV pacing had a statistically significant greater CO and CI (CO 6.7±1.8 l/min, CI 3.4±0.7 l/min/m²) than patients undergoing DDD RV pacing (CO 5.5±1.4 l/min, CI 2.8±0.7 l/min/m²), p<0.001. DDD BIV paci ng in the early postoperative period after cardiac surgery corrects LV dyssynchrony and has better hemodynamic results than DDD RV pacing., F. Straka ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
This study investigated whether each part of the heart is evenly innervated by the left or right vagus and observed the mechanism of compensatory recovery after unilateral cervical vagotomy. HR, BP, LVSP and ±dp/dt max all decreased one week after left vagotomy, whereas only BP and -dp/dt max decreased one week after right vagotomy. We stern blot analyses revealed that the expression of M2 receptors in the left atrium and left ventricle was upregulated after subacute (1 week) left/right vagotomy. However, significantly more cholinesterase-positive nerves in LV and RV were seen one week after unilateral vagotomy compared to the sham-operated group. In addition, baroreflex sensitivity was increased after subacute right vagotomy. The decreasing effects of ACh (0.5 μ g/kg) on LVSP and ±dp/dt max (but not on HR and BP) were facilitated by subacute unilateral vagotomy. Our present experiments indicate that 1) the working myocardium is innervated bilaterally by the vagus, 2) ventricular contractility is influenced more by denervation of the left than the right vagus and 3) up-regulation of M2 muscarinic receptors in the left heart, increase of cholinergic nerves, and high baroreflex sensitivity could be involved in the mechanism of compensatory hemodynamic recovery via contralateral vagus overactivity, thereby amplifying contralateral vagal activity and decreasing cardiac contractility., L. N. Chen, W. J. Zang, X. J. Yu, J. Liu, D. L. Li, S. S. Kong, J. Lu, X. L. Xu., and Obsahuje bibliografii a bibliografické odkazy
Cíl. Retrospektivně zhodnotit efekt a dlouhodobou průchodnost transjugulární intrahepatální portosystémové spojky (TIPS) u nemocných s trombózou jaterních žil. Metoda. V letech 1992-2011 jsme vytvořili TIPS celkem u 38 pacientů s trombózou jaterních žil nekontrolovatelnou medikamentózní léčbou. Léčeno bylo devět mužů a 29 žen ve věku 13-76 let (medián 33 let), v šesti případech se jednalo o děti. Predisponující trombofilní stav byl prokázán u 84,2 % osob. Klinická forma Buddova-Chiariho syndromu byla v šesti případech akutní, v 18 případech subakutní a ve 14 případech chronická. Indikací k výkonu byl u 31 nemocných ascites, u pěti pacientů jaterní selhání a u dvou krvácení do zažívacího traktu. Zákroky byly prováděny standardní technikou v analgosedaci nebo v celkové anestezii. U 17 pacientů jsme do kanálu TIPS implantovali nepotažený stent nebo kombinaci potaženého a nepotaženého stentu, u 21 nemocných jsme zkrat vyztužili pouze pro TIPS dedikovaným potaženým stentem (stentgraftem). Sledování průchodnosti zkratu po výkonu bylo založeno na pravidelných ultrasonografických, klinických a laboratorních kontrolách, při prokázané poruše průchodnosti byla provedena reintervence. Výsledky. Celková doba sledování souboru byla 8 dní - 207 měsíců (medián 52 měsíců). Technického úspěchu jsme dosáhli u 100% nemocných, hemodynamická úspěšnost výkonu byla 86,8 %, s poklesem mediánu portosystémového gradientu z 23 mm Hg na 8 mm Hg, klinicky bylo dosaženo ústupu obtíží u 89,5% nemocných. Významné komplikace jsme zaznamenali celkem u sedmi osob, žádný pacient nezemřel v přímé souvislosti se zákrokem. V průběhu sledování zemřelo celkem jedenáct nemocných (29 %), přežití souboru za 1 rok a za 5 let od TIPS bylo 85,3 % a 65,4 %. Během doby sledování jsme provedli celkem 50 reintervencí pro dysfunkci spojky, průměrný počet reintervencí přepočtený na jednoho nemocného za dobu 5 let byl 1,65 výkonu u pacientů se zkratem vytvořeným stentem a 0,67 výkonu u nemocných, u kterých byl primárně použit stentgraft. Ve skupině se zavedeným nekrytým stentem byla primární průchodnost 52,9% za 1 rok a 20 % za 5 let od výkonu, u skupiny s implantovaným potaženým stentem byla jednoletá primární průchodnost 80 % a pětiletá primární průchodnost 33,3%. V průběhu sledování jsme zároveň u osmi pacientů provedli angioplastiku dolní duté žíly pro její symptomatickou stenózu, u šesti z těchto nemocných byl do dolní duté žíly zaveden stent. Závěr. Vytvoření TIPS je velmi efektivní metodou léčby pacientů s trombózou jaterních žil. Použití pro TIPS dedikovaných potažených stentů vede knižšímu počtu dysfunkcí zkratu s nižším počtem reintervencí nezbytných k obnově průchodnosti, nutností je však současná důsledná antikoagulační léčba a léčba základního hematologického onemocnění., Aim. To retrospectively evaluate the efficacy and long-term patency of transjugular intrahepatic portosystemic shunt (TIPS) in patients with hepatic vein thrombosis. Method. In years 1992-2011, totally 38 patients with hepatic vein thrombosis resistant to medical therapy underwent TIPS creation in our department. We treated 9 males and 29 females, age 13-76 years (median 33 years), 6 patients were children. The underlying thrombophilic state was confirmed in 84.2% of treated patients. The Budd-Chiari syndrome was acute in 6, subacute in 18 and chronic in 14 cases. Ascites was indication for TIPS in 31 patients, liver failure in 5 and gastrointestinal bleeding in 2 persons. All the procedures were performed in anal-gosedation or under general anestesia using standard technique. In 17 patients, we implanted non-covered stent or combination of non-covered and covered stents during TIPS creation, in the other 21 patients only the TIPS dedicated covered stents had been used. TIPS patency during follow-up after the procedure was based on regular ultra-sonographic, clinical and laboratory examinations. In case of shunt dysfunction, a rein-tervention was performed. Results. The total follow-up period was 8 days - 207 months (median 52 months). The technical success rate was 100%, hemo-dynamical success rate 86.8% with median portosystemic gradient decrease from 23 mm Hg to 8 mm Hg, and clinically we were succesfull in 89.5% of patients. In 7 patients, severe complications occurred during shunt creation, but none of the patients died in direct connection with the procedure. Totally 11 patients (29%) died during follow-up period, the 1-year and 5-years survival rates were 85.3% and 65.4%, respectively. Due to TIPS dysfunction, totally 50 reinterventions were needed, the average 5-year reintervention rate per patient was 1.65 procedures in the bare stent group and 0.67 porcedures in the covered stent group. In the non-covered stent group, we achieved primary patency rates 52.9% 1 year and 20% 5 years after TIPS creation, in the covered stent group the 1-year primary patency rate was 80% and 5-year primary patency rate 33.3%. Angioplasty of symptomatic stenosis of the inferior vena cava was performed in 8 patients during follow-up, in 6 of these patients also stent implantation was necessary. Conclusion. TIPS creation is a very effective treatment of patients with hepatic vein thrombosis. The use of TIPS dedicated covered stents leads to lower dysfunction rate with lower number of reinterventions needed to reestablish the shunt patency, but strict simultaneous anticoagulation treatment and treatment of the underlying hematologie disease are necessary., Renc O, Krajina A, Hůlek P, Lojík M, Raupach J, Chovanec V, Jirkovský V, Fejfar T, Šafka V, Pozler O, Dulíček P, Čermáková E, Machová V., and Literatura
The aims were to explore the effect of head-up tilt (HUT) to 30 and 60 degrees on hemodynamics and tissue oxygenation in anesthetized healthy swine. The data serve as a reference for a study of resuscitation efficacy at HUT such as during transport. Nine healthy swine (49±4 kg) were anesthetized and multiple sensors including myocardial pressure-volume loops catheter, carotid flow probe, blood pressure catheters, near infrared spectroscopy (NIRS) tissue oximetry and mixed venous oximetry (SVO2) catheter were introduced and parameters continuously recorded. Experimental protocol consisted of baseline in supine position (15 min), 30 degrees HUT (15 min), recovery at supine position (15 min) and 60 degrees HUT (5 min). Vacuum mattress was used for body fixation during tilts. We found that 30 and 60 degrees inclination led to significant immediate reduction in hemodynamic and oximetry parameters. Mean arterial pressure (mm Hg) decreased from 98 at baseline to 53 and 39, respectively. Carotid blood flow dropped to 47 % and 22 % of baseline values, end diastolic volume to 49 % and 53 % and stroke volume to 47 % and 45 % of baseline. SVO2 and tissue oximetry decreased by 17 and 21 percentage points. The values are means. In conclusions, within minutes, both 30 and 60 degrees head-up tilting is poorly tolerated in anesthetized swine. Significant differences among individual animals exist., M. Mlcek, J. Belohlavek, M. Huptych, T. Boucek, T. Belza, S. Lacko, P. Krupickova, M. Hrachovina, M. Popkova, P. Neuzil, O. Kittnar., and Obsahuje bibliografii
Extracorporeal life support (ECLS) is a treatment modality that provides prolonged blood circulation, gas exchange and can partially support or fully substitute functions of heart and lungs in patients with severe but potentially reversible cardiopulmonary failure refractory to conventional therapy. Due to high-volume bypass, the extracorporeal flow is interacting with native cardiac output. The pathophysiology of circulation and ECLS support reveals significant effects on arterial pressure waveforms, cardiac hemodynamics, and myocardial perfusion. Moreover, it is still subject of research, whether increasing stroke work caused by the extracorporeal flow is accompanied by adequate myocardial oxygen supply. The left ventricular (LV) pressure-volume mechanics are reflecting perfusion and loading conditions and these changes are dependent on the degree of the extracorporeal blood flow. By increasing the afterload, artificial circulation puts higher demands on heart work with increasing myocardial oxygen consumption. Further, this can lead to LV distention, pulmonary edema, and progression of heart failure. Multiple methods of LV decompression (atrial septostomy, active venting, intra-aortic balloon pump, pulsatility of flow) have been suggested to relieve LV overload but the main risk factors still remain unclear. In this context, it has been recommended to keep the rate of circulatory support as low as possible. Also, utilization of detailed hemodynamic monitoring has been suggested in order to avoid possible harm from excessive extracorporeal flow., Pavel Hála, Otomar Kittnar., and Obsahuje bibliografii
Operations in the pleural cavity are connected with circulatory changes in pulmonary circulation and general changes of hemodynamics. These changes are influenced by the position of patient’s body on the operation table and by the introduction of artificial pneumothorax. Thoracoscopy is an advanced surgical approach in thoracic surgery, but its hemodynamic effect is still not known. The aim of the present study was to compare the hemodynamic response to surgeries carried out by open (thoracotomy - TT) and closed (thoracoscopy - TS) surgical approach. Thirty-eight patients have been monitored throughout the operation - from the introduction of anesthesia to completing the surgery. Monitored parameters were systolic blood pressure (BPs), diastolic blood pressure (BPd), O2 saturation (SaO2), systolic blood pressure in pulmonary artery (BPPAs), diastolic blood pressure in pulmonary artery (BPPAd), wedge pressure (PW), central venous pressure in right atrium (CVP), cardiac output (CO) and total peripheral resistance (TPR). No significant difference has been found in hemodynamic response between TT and TS groups. Significant changes of hemodynamic parameters occurring during the whole surgical procedure were detected in both technical approaches. The most prominent changes were found after the position of patients was changed to the hip position (significantly decreased BPs, BPd, MAP, SaO2 and BPPAs) and 5 min after the pneumothorax was established (restoration of the cardiac output to the initial value and significant decrease of the TPR). It can be concluded that the thoracoscopy causes almost identical hemodynamic changes like the thoracotomy., S. Trča ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
In experimental and human diabetes mellitus, evidence for an impaired function of the vascular endothelium has been found and has been suggested to contribute to the development of vascular complications in this disease. The aim of the study was to evaluate possible regional hemodynamic in vivo differences between healthy and diabetic rats which would involve nitric oxide (NO). Central hemodynamics and regional blood flow (RBF) were studied using radioactive microspheres in early streptozotocin (STZ)-diabetic rats and compared to findings in healthy control animals. This method provides a possibility to study the total blood flow and vascular resistance (VR) in several different organs simultaneously. L-NAME iv induced widespread vasoconstriction to a similar extent in both groups. In the masseter muscle of both groups, acetylcholine 2 μg/kg per min, induced a RBF increase, which was abolished by pretreatment with L-NAME, suggesting NO as a mediator of vasodilation. In the heart muscle of both groups, acetylcholine alone was without effect while the combined infusion of acetylcholine and L-arginine induced an L-NAME-sensitive increase in RBF. The vasodilation induced by high-dose acetylcholine (10 μg/kg per min) in the kidney was more pronounced in the STZ-diabetic rats. The results indicate no reduction in basal vasodilating NO-tone in the circulation of early diabetic rats. The sensitivity to vasodilating effects of acetylcholine at the level of small resistance arterioles vary between tissues but was not impaired in the diabetic rats. In the heart muscle the availability of L-arginine was found to limit the vasodilatory effect of acetylcholine in both healthy and diabetic rats. In conclusion, the results indicate a normal action of NO in the investigated tissues of the early STZ-diabetic rat., E. Granstam, S.-O. Granstam., and Obsahuje bibliografii
Pulmonary hypertension (PH) unresponsive to pharmacological intervention is considered a contraindication for orthotopic heart transplantation (OHTX) due to risk of postoperative right-heart failure. In this prospective study, we describe our experience with a treatment strategy of improving severe PH in heart transplant candidates by means of ventricular assist device (VAD) implantation and subs equent OHTX. In 11 heart transplantation candidates with severe PH unresponsive to pharmacological intervention we implanted VAD with the aim of achieving PH to values acceptable for OHTX. In all patients we observed significant drop in pulmonary pr essures, PVR and TPG (p<0.001 for all) 3 months after VAD implantation to values sufficient to allow OHTX. Seven patients underwent transplantation (mean duration of support 216 days) while none of patients suffered right-side heart failure in postoperative period. Two patients died after transplantation and five patients are living in very good condition with a mean duration of 286 days after OHTX. In our opinion, severe PH is not a contraindication for orthotopic heart transplantation any more., J. Kettner ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Cíl: Na kohortě pacientů s asymptomatickou stenózou vnitřní karotidy podstupujících karotickou endarterektomii otestovat protokol vyšetření hemodynamiky mozku pomocí magnetické rezonance a zjišťovat rozdíl v kognitivní kondici pomocí neuropsychologické testové baterie RBANS (Repeatable Battery for the Assessment of Neuropsychological Status). Metody: Standardní karotická endarterektomie pro asymptomatickou stenózu vnitřní karotidy v intravenózní celkové anestezii se selektivním užitím shuntu. Měření průtoku velkými cévami Willisova okruhu pomocí magnetickorezonační angiografie s fázovým kontrastem před operací a tři měsíce po operaci, a to paralelně s psychologickým vyšetřením testovou baterií RBANS. Výsledky: U pěti žen a 12 mužů s nekomplikovanou karotickou endarterektomií pro asymptomatickou stenózu vnitřní karotidy bylo zaznamenáno signifikantní zlepšení v oblasti kognitivního výkonu v celkovém skóru neuropsychologické baterie (p = 0,05) a indexech týkajících se bezprostřední paměti (p = 0,04) a řeči (p = 0,01). Následné korelace lokální změny hemodynamiky a změn v kognitivním výkonu z magnetickorezonančních dat získaných od 12 pacientů byly signifikantní pro přední mozkovou tepnu a index bezprostřední paměti (p = 0,01), a pro střední mozkovou tepnu a indexy řeči (p = 0,02) a vizuoprostorové orientace (p = 0,02). Závěr: V pilotní studii byl na malé skupině pacientů s klinicky i radiologicky asymptomatickou stenózou vnitřní karotidy poprvé v naší literatuře otestován protokol vyšetření průtoku krve (ml/min) na všech velkých cévách Willisova okruhu a srovnány změny hemodynamiky před karotickou endarterektomií a tři měsíce po ní. V úrovni kognitivního výkonu bylo prokázáno zlepšení, u kterého byl v dílčích testech neuropsychologické baterie RBANS identifikován vztah s hodnotami průtoků v povodí přední nebo střední mozkové tepny. Větší studie s delším sledováním výsledků je proveditelná., Aim: To test a brain haemodynamics examination protocol using magnetic resonance imaging and to investigate the differences in cognitive performance with a neuropsychology test battery RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) on a cohort of patients with an asymptomatic carotid stenosis undergoing carotid endarterectomy. Methods: Standard carotid endarterectomy in asymptomatic carotid stenosis under general intravenous anaestehesia with selective use of a shunt. Flow measurement in major vessels of the Willis circle using magnetic resonance angiography with phase contrast before and three months after the operation and concurrently with RBANS psychological examination testing battery. Results: Significant cognitive performance improvement in neuropsychological test battery total score and in short-term memory (p = 0.04) and speech (p = 0.01) indexes was seen in five women and 12 men undergoing uncomplicated carotid endarterectomy. Subsequent correlations of local haemodynamic change and cognitive performance change in 12 patients were significant for the anterior cerebral artery and immediate memory index (p = 0.01), and for the medial cerebral artery and speech indeces (p = 0.02) and visuospatial orientation (p = 0.02). Conclusion: In a pilot study, a flow (ml/min) examination protocol of all major Willis circle arteries was tested and haemodynamic changes before the operation and in three months follow-up after carotid endarterectomy were compared on a small group of patients with radiologically and clinically asymptomatic carotid stenosis for the first time in Czech literature. Improvement in cognitive performance was demonstrated and an association with anterior or medial cerebral artery flow values was identified in individual RBANS tests. A larger study with a longer follow-up is feasible. Key words: carotid artery atherosclerosis – carotid artery stenosis – carotid endarterectomy – cognition – neuropsychology The authors declare they have no potential conflicts of interest concerning drugs, products, or services used in the study. The Editorial Board declares that the manuscript met the ICMJE “uniform requirements” for biomedical papers., and J. Fiedler, T. Mrhálek, M. Vavrečka, S. Ostrý, M. Bombic, J. Kubále, V. Přibáň, M. Preiss, I. Stuchlíková
Hypertenze závislá na soli patří mezi nejčastější rizikové faktory kardiovaskulárních onemocnění. U většiny případů je příčina tohoto onemocnění neznámá, avšak významný podíl hypertenzních jedinců citlivých k soli má zvýšené hladiny mineralokortikoidů. V tomto přehledném článku popisujeme hemodynamické abnormality a mechanismy odpovědné za vývin této formy hypertenze., Salt-dependent hypertension is a leading cause of cardiovascular diseases. In most cases, the etiology is unknown, but it has been estimated that a significant percentage of salt-sensitive hypertensive individuals have mineralocorticoid excess. In this review, we describe hemodynamic abnormalities and mechanisms responsible for initiation of this form of hypertension., and Michal Pravenec.