Ýëåêòðîêàðäèîãðàôèÿ - ìåòîä ãðàôè÷åñêîé ðåãèñòðàöèè òåõ ýëåêòðè÷åñêèõ ÿâëåíèé, êîòîðûìè ñîïðîâîæäàåòñÿ äåÿòåëüíîñòü ñåðäöà, îðãàíà, êîòîðûé áåç óñòàëè ñîêðàùàåòñÿ è ðàññëàáëÿåòñÿ 60-80 ðàç â ìèíóòó. Ýëåêòðîêàðäèîãðàììà (ÝÊÃ) - êðèâàÿ çàïèñè (ñì. ñõåìó). Êàæäîå âîçáóæäåíèå ñåðäöà âûçûâàåò âîçíèêíîâåíèå òîêà äåéñòâèÿ, êîòîðûé íà êðèâîé âûçûâàåò ïîÿâëåíèå çóáöîâ - P, Q, R, S, T, à âî âðåìÿ ðàññëàáëåíèÿ òîêà íåò, è ïèøåòñÿ ïðÿìàÿ ëèíèÿ. Íî êàæäûé ÷åëîâåê, êîòîðîìó õîòÿ áû îäíàæäû ñíèìàëè ÝÊÃ, çíàåò, ÷òî ýëåêòðîäû åìó íàêëàäûâàëè íà ðóêè è íîãó, à òàêæå íà ãðóäíóþ êëåòêó, à íå íà ñåðäöå. Ïî÷åìó æå ìû ãîâîðèì, ÷òî ðåãèñòðèðóåì òîêè îò ñåðäöà? Ýòî íå áëåô, ìû äåéñòâèòåëüíî âèäèì ÝÊÃ. Ñåðäöå â ÷åëîâå÷åñêîì îðãàíèçìå ÿâëÿåòñÿ êàê áû ãåíåðàòîðîì ýëåêòðè÷åñêîãî òîêà, êîòîðûé äâèæåòñÿ ïî îïðåäåëåííûì ëèíèÿì ñ îäèíàêîâûì ýëåêòðè÷åñêèì ïîòåíöèàëîì, à ñàì íàø îðãàíèçì îãðîìíûé ïðîâîäíèê òîêà. Ïîýòîìó íà ðóêå, íàïðèìåð, ýëåêòðè÷åñêèé ïîòåíöèàë áóäåò òàêîé æå, êàê íà ó÷àñòêå ñåðäöà, òîëüêî ñèëà òîêà, åñòåñòâåííî áóäåò ñëàáåå. Íî òóò âñòóïàåò â äåéñòâèå òåõíèêà.  àïïàðàòàõ äëÿ ðåãèñòðàöèè ÝÊà ñóùåñòâóþò óñèëèòåëè, áëàãîäàðÿ êîòîðûì ñèëà òîêà óñèëèâàåòñÿ, è ìû ïîëó÷àåì ïîëíîöåííóþ êðèâóþ.
Íî âåäü â ÝÊÃ, êîòîðóþ ïàöèåíòû ïîëó÷àþò íà ðóêè, íå îäíà êðèâàÿ, à ìèíèìóì 12, îíè îáîçíà÷àþòñÿ ðàçíûìè öèôðàìè è áóêâàìè è îòëè÷àþòñÿ äðóã îò äðóãà? Âñå ïðàâèëüíî, ñîâðåìåííàÿ ÝÊà ñíèìàåòñÿ â 12 îòâåäåíèÿõ, à äëÿ ÷åãî ýòî íóæíî ìîæíî ïîíÿòü, ãëÿäÿ íà ñëåäóþùèé ðèñóíîê.

Ïðåäñòàâüòå ñåáå, ÷òî ìû ñìîòðèì íà ñåðäöå (íà äîìèê, íà êàìåíü, íà ÷åëîâåêà) ñ âåðøèíû õîëìà. Ìû ïîëó÷àåì î ïðåäìåòå ñàìîå îáùåå ïðåäñòàâëåíèå. Òàê êîãäà-òî ñíèìàëè ÝÊà - òðè ñòàíäàðòíûõ îòâåäåíèÿ - I, II, III - îò ðóê è íîãè è ïîëó÷àëè îáùåå ïðåäñòàâëåíèå îá ýëåêòðè÷åñêèõ ïðîöåññàõ âî âñåì ñåðäöå. Ïîòîì ìû ñ õîëìà ñïóñêàåìñÿ íèæå, ÷òîáû ïðèãëÿäåòüñÿ - ñòàëè ñíèìàòü îòâåäåíèÿ aVR, aVL è aVF. À ÷òîáû áîëåå äåòàëüíî "ðàññìîòðåòü" ýëåêòðè÷åñêèé ïîðòðåò ñåðäöà ýëåêòðîäû ñòàëè ñòàâèòü ïðÿìî íà ãðóäíóþ êëåòêó - øåñòü ãðóäíûõ îòâåäåíèé - V1-V6.  îñîáûõ ñëó÷àÿõ â íàñòîÿùåå âðåìÿ êîëè÷åñòâî ãðóäíûõ îòâåäåíèé ìîæåò áûòü óâåëè÷åíî äî 35.
Öåëè èññëåäîâàíèÿ. Ýëåêòðîêàðäèîãðàôèÿ èñïîëüçóåòñÿ äëÿ äèàãíîñòèêè èøåìè÷åñêîé áîëåçíè ñåðäöà - ñòåíîêàðäèè, èíôàðêòà ìèîêàðäà, íàðóøåíèé ðèòìà ñåðäöà. Ìåòîä ïîçâîëÿåò îïðåäåëèòü ïîëîæåíèå ñåðäöà â ãðóäíîé êëåòêå è åãî âîçìîæíûå èçìåíåíèÿ, ïîëó÷èòü ïðåäñòàâëåíèå î âåëè÷èíå êàìåð ñåðäöà è èõ èçìåíåíèÿõ. Ìåòîä äàåò îïðåäåëåííóþ èíôîðìàöèþ ïðè âîñïàëèòåëüíûõ ïðîöåññàõ â ìûøöå ñåðäöà è âíåøíåé åãî îáîëî÷êå - ïåðèêàðäå.
Êàê âûïîëíÿåòñÿ èññëåäîâàíèå. Áîëüíîìó íàêëàäûâàþòñÿ ýëåêòðîäû íà ðóêè, íîãè è ãðóäíóþ êëåòêó. ÝÊà â ñòàíäàðòíûõ ñèòóàöèÿõ ðåãèñòðèðóåòñÿ â 12 îòâåäåíèÿõ. Ñóùåñòâóþò ìåòîäèêè, êîãäà ïîñëå ðåãèñòðàöèè ÝÊà â ïîêîå, ìíîãîêðàòíî çàïèñûâàþò êðèâûå âî âðåìÿ äîçèðîâàííîé ôèçè÷åñêîé íàãðóçêè, êîòîðóþ áîëüíîé âûïîëíÿåò íà âåëîñèïåäå (âåëîýðãîìåòðå) èëè áåãóùåé äîðîæêå (òðåäìèëå). Âìåñòî ôèçè÷åñêîé íàãðóçêè áîëüíîìó â ðÿäå ñëó÷àåâ ââîäÿò ëåêàðñòâåííûå âåùåñòâà, è ïîñëå ýòîãî òàêæå ñíèìàþò ÝÊÃ. Åñòü ìåòîäèêà ò.í. Õîëòåðîâñêîãî ìîíèòîðèðîâàíèÿ, êîãäà ÝÊà íåïðåðûâíî çàïèñûâàåòñÿ íà ìàãíèòíóþ ëåíòó â òå÷åíèå 18-24 ÷àñîâ.
Íîðìà.  çàêëþ÷åíèè ÝÊà çäîðîâîãî ÷åëîâåêà áåç êàêèõ-ëèáî íàðóøåíèé îòìå÷àåòñÿ, ÷òî ðèòì ñåðäå÷íûé ñîêðàùåíèé ïðàâèëüíûé, ñèíóñîâûé, ýëåêòðè÷åñêàÿ îñü ñåðäöà íå îòêëîíåíà.
Îñíîâíûå ïðèçíàêè áîëåçíåé, âûÿâëÿåìûå ïðè ÝÊÃ-èññëåäîâàíèè.
Ïðèçíàêè íàðóøåíèé ñåðäå÷íîãî ðèòìà
Ñèíóñîâûå íàðóøåíèÿ ñåðäå÷íîãî ðèòìà ïðîÿâëÿþòñÿ ó÷àùåíèåì èëè óðåæåíèåì êîëè÷åñòâà ñåðäå÷íûõ ñîêðàùåíèé â 1 ìèíóòó. Îíè áûâàþò ó çäîðîâûõ ëþäåé ïðè ôèçè÷åñêîé íàãðóçêå, íî ìîãóò áûòü ïðèçíàêàìè çàáîëåâàíèé ñåðäöà – ìèîêàðäèòîâ, ïîðîêîâ ñåðäöà, ãèïåðòîíèè, èøåìè÷åñêîé áîëåçíè ñåðäöà.
Ýêñòðàñèñòîëû – ýòî ïðåæäåâðåìåííûå ñîêðàùåíèÿ æåëóäî÷êîâ, êîòîðûå íàðóøàþò ïðàâèëüíûå ðèòìè÷íûå ñîêðàùåíèÿ ñåðäöà. Èìïóëüñû ê âîçíèêíîâåíèþ ýêñòðàñèñòîë ìîãóò âîçíèêàòü â ðàçëè÷íûõ îòäåëàõ ñåðäöà è ðàñïîçíàåòñÿ ýòî òîëüêî ñ ïîìîùüþ ÝÊÃ. Ýêñòðàñèñòîëû ìîãóò áûòü ó ñîâåðøåííî çäîðîâûõ ëþäåé, íàïðèìåð, ïðè âûêóðèâàíèè áîëüøîãî êîëè÷åñòâà ñèãàðåò â òå÷åíèå êîðîòêîãî âðåìåíè, óïîòðåáëåíèè â áîëüøèõ êîëè÷åñòâàõ êîôå, êðåïêîãî ÷àÿ. Íî ÷àùå îíè ÿâëÿþòñÿ ïðèçíàêàìè ñåðüåçíûõ áîëåçíåé ñåðäöà – ïîðîêîâ ñåðäöà, ìèîêàðäèòîâ, ãèïåðòîíèè, èøåìè÷åñêîé áîëåçíè.
Ïðèçíàêè ïàðîêñèçìàëüíûõ íàðóøåíèé ðèòìà ñåðäöà. Ïàðîêñèçì – ýòî âíåçàïíî íà÷èíàþùèéñÿ ïðèñòóï ñåðäöåáèåíèé, êîãäà èõ ÷àñòîòà â ìèíóòó äîñòèãàåò 150-200 è áîëåå ñîêðàùåíèé. Ýòî ïðèâîäèò ê áîëÿì â îáëàñòè ñåðäöà, îäûøêå. Ïàðîêñèçìàëüíûå íàðóøåíèÿ ðèòìà âñåãäà ñâèäåòåëüñòâóþò î ñåðüåçíîñòè çàáîëåâàíèÿ è òðåáóþò íåîòëîæíîé ìåäèöèíñêîé ïîìîùè.
Atrialflutter; Atrialfibrilation – ôèáðèëëÿöèÿ ïðåäñåðäèé; òðåïåòàíèå ïðåäñåðäèé
Ïðèçíàêè ìåðöàòåëüíîé àðèòìèè, ñàìîãî ñåðüåçíîãî âèäà íàðóøåíèé ñåðäå÷íîãî ðèòìà. Ðèòì àáñîëþòíî íåïðàâèëüíûé, ÷òî ïðèâîäèò ê çíà÷èòåëüíûì íàðóøåíèÿì â ðàáîòå ñåðäöà, ðàçâèòèþñåðäå÷íîé íåäîñòàòî÷íîñòè.  íàñòîÿùåå âðåìÿ èìåþòñÿ äîñòàòî÷íî ýôôåêòèâíûå ìåòîäû ëå÷åíèÿ ýòèõ íàðóøåíèé ðèòìà. Áîëüíûå ñ ïîäîáíûìè íàðóøåíèÿìè ðèòìà äîëæíû ïîñòîÿííî íàáëþäàòüñÿ âðà÷îì.
Sino-atrialbloc; Ist.degreeA-Vblock; 2 st.degreeA-Vblock; 3 st.degreeA-Vblock - ñèíîàòðèàëüíàÿ áëîêàäà; à-â áëîêàäà 1 ñòåïåíè; à-â áëîêàäà 2 ñòåïåíè; à-â áëîêàäà 3 ñòåïåíè
Ñåðäöå ÷åëîâåêà ñîêðàùàåòñÿ ðèòìè÷íî ïîä âîçäåéñòâèåì ýëåêòðè÷åñêèõ èìïóëüñîâ, âîçíèêàþùèõ àâòîìàòè÷åñêè â íåì ñàìîì, â ñïåöèàëüíîé ïðîâîäÿùåé ñèñòåìå ñåðäöà. Âûøåíàçâàííûå ïðèçíàêè óêàçûâàþò íà íàðóøåíèå ïðîâåäåíèÿ èìïóëüñîâ â ýòîé ñèñòåìå. Ðàçâèâàþòñÿ áëîêàäû ñåðäöà. ×åì âûøå ñòåïåíü áëîêàäû, òåì áîëåå îíà îïàñíà äëÿ ðàçâèòèÿ íàðóøåíèé îðãàíèçìà. Áîëüíîé ìîæåò ïîòåðÿòü ñîçíàíèå, ìîæåò áûòü îñòàíîâêà ñåðäöà. Åñëè òàêèå ñîñòîÿíèÿ ïîâòîðÿþòñÿ, ïðèìåíÿþòñÿ èñêóññòâåííûå âîäèòåëè ñåðäå÷íîãî ðèòìà – ïåéñìåêêåðû.
Wolf-Parkinson-White pattern; Short P-R Interval – WPW- ñèíäðîì; óäëèíåííûéèíòåðâàëP-R
Âðîæäåííûå ñîñòîÿíèÿ, îïàñíûå òåì,÷òî ïðè íèõ âîçíèêàþò ïàðîêñèçìàëüíûå íàðóøåíèÿ ðèòìà.Äëÿ óòî÷íåíèÿ ïðèðîäû òàêîãî ðîäà íàðóøåíèé ðèòìà ïðèìåíÿþòñÿ ñïåöèàëüíûå ýëåêòðîôèçèîëîãè÷åñêèå èññëåäîâàíèÿ ñåðäöà. Ëå÷åíèå ïðîâîäèòñÿ õèðóðãè÷åñêèìè ìåòîäàìè.
Rightbundlebranchblock; Leftbundlebranchblock – áëîêàäà ïðàâîé íîæêè ïó÷êà Ãèñà; áëîêàäà ëåâîé íîæêè ïó÷êà Ãèñà
Áëîêàäà ïðàâîé íîæêè ìîæåò áûòü â íîðìå ó çäîðîâîãî ÷åëîâåêà, áëîêàäà ëåâîé íîæêè ÷àùå âñåãî áûâàåò ó áîëüíûõèøåìè÷åñêîé áîëåçíüþ ñåðäöà.
Ïðèçíàêè óâåëè÷åíèÿ ðàçìåðîâ ñåðäöà
Left axisDeviation;Counter-clockwiserotation; Leftatrialenlargement; Leftventricularhypertrophy – îòêëîíåíèå îñè ñåðäöà âëåâî; îòêëîíåíèå îñè ñåðäöà ïðîòèâ ÷àñîâîé ñòðåëêè; óâåëè÷åíèå ëåâîãî ïðåäñåðäèÿ; óâåëè÷åíèå ëåâîãî æåëóäî÷êà
Ïðèçíàêè óâåëè÷åíèÿ ëåâûõ îòäåëîâ ñåðäöà – ëåâîãî ïðåäñåðäèÿ è ëåâîãî æåëóäî÷êà. Ýòî áûâàåò ïðèãèïåðòîíèè, íåêîòîðûõ ïîðîêàõ ñåðäöà. Äèàãíîç óâåëè÷åíèÿ ëåâûõ îòäåëîâ ñåðäöà îáû÷íî óòî÷íÿåòñÿ ñ ïîìîùüþ óëüòðàçâóêîâîãî èññëåäîâàíèÿ ñåðäöà.
RightaxisDeviation; Clockwiserotation; Rightatrialenlargement; Rightventricularhypertrophy – îòêëîíåíèå îñè ñåðäöà âïðàâî; îòêëîíåíèå îñè ñåðäöà ïî ÷àñîâîé ñòðåëêå; óâåëè÷åíèå ïðàâîãî ïðåäñåðäèÿ; óâåëè÷åíèå ïðàâîãî æåëóäî÷êà
Ïðèçíàêè óâåëè÷åíèÿ ïðàâûõ îòäåëîâ ñåðäöà – ïðàâîãî ïðåäñåðäèÿ è ïðàâîãî æåëóäî÷êà. Ýòî áûâàåò ïðè õðîíè÷åñêèõ âîñïàëèòåëüíûõ çàáîëåâàíèÿõ ëåãêèõ, íåêîòîðûõ ïîðîêàõ ñåðäöà. Äëÿ óòî÷íåíèÿ ðàçìåðîâ ïðàâûõ îòäåëîâ ñåðäöà ïðèìåíÿþò òàêæå óëüòðàçâóêîâîå èññëåäîâàíèå.
Biatrialenlargement;Biventricularhypertrophy – óâåëè÷åíèå îáîèõ ïðåäñåðäèé; óâåëè÷åíèå îáîèõ æåëóäî÷êîâ
Óâåëè÷åíèå âñåõ ÷åòûðåõ îòäåëîâ ñåðäöà – õàðàêòåðíî äëÿõðîíè÷åñêîé ñåðäå÷íîé íåäîñòàòî÷íîñòè, êàðäèîìèîïàòèé è ìèîêàðäèòîâ.Áîëåå òî÷íî î ðàçìåðàõ ñåðäöà ïîçâîëÿåò ñóäèòü óëüòðàçâóêîâîå èññëåäîâàíèå.
Ïðèçíàêè íàðóøåíèÿ êðîâîîáðàùåíèÿ â ñåðäöå
STelevation; STdepression; InvertedT-waves; BiphasicTwaves; FlatTwaves – ïîâûøåíèå èíòåðâàëà ST; ñíèæåíèå èíòåðâàëà ST; îòðèöàòåëüíûé çóáåö T; äâóôàçíûé çóáåö T; óïëîùåííûé çóáåö T
Óêàçàííûå ïðèçíàêè ìîãóò áûòü ïðè íàðóøåíèÿõ êðîâîñíàáæåíèÿ ìûøöû ñåðäöà (ìèîêàðäà) -ñòåíîêàðäèè, íî òàêæå è ïðè äðóãèõ áîëåçíÿõ ñåðäöà – ìèîêàðäèòàõ, êàðäèîìèîïàòèÿõ, ïåðèêàðäèòàõ. Â ñâÿçè ñ ýòèì ó ýòèõ áîëüíûõ ïðèìåíÿþòñÿ äîïîëíèòåëüíûå ìåòîäû äèàãíîñòèêè – ñòðåññ-òåñò ÝÊÃ, óëüòðàçâóêîâîå èññëåäîâàíèå ñåðäöà, êîðîíàðîãðàôèÿ.
Q wave – ãëóáîêèé çóáåö Q
Ïðèçíàêèíôàðêòà ìèîêàðäà.
Possiblyacutemyocardialinfarction; Probablyrecentmyocardialinfarction; Probablyoldmyocardialinfarction; Myocardialinfarctionageundetermined - âîçìîæíûé îñòðûé èíôàðêò ìèîêàðäà; âåðîÿòíûé òåêóùèé èíôàðêò ìèîêàðäà; âåðîÿòíûé ñòàðûé èíôàðêò ìèîêàðäà; ïåðåíåñåííûé èíôàðêò ìèîêàðäà
Ïðèçíàêè âîçíèêøåãî, òåêóùåãî èëè ïåðåíåñåííîãîèíôàðêòà ìèîêàðäà.
Non-Q-wavemyocardialinfarction – èíôàðêò ìèîêàäà áåç çóáöà Q
Ïðèçíàêèíôàðêòà ìèîêàðäà, íî áåç ãëóáîêîãî çóáöà Q, èíîãäà òàêîé èíôàðêò ìèîêàðäà íàçûâàþò ìåëêîî÷àãîâûì, îí íåáîëüøèõ ðàçìåðîâ.
Lowvoltage;Electricalalternans – ñíèæåíèå âîëüòàæà çóáöîâ ÝÊÃ; ïðèçíàêè ýëåêòðè÷åñêîé àëüòåðíàöèè ñåðäöà
Òàêèå èçìåíåíèÿ ÝÊà íàáëþäàþòñÿ ïðèìèîêàðäèòàõ; ñåðäå÷íîé íåîñòàòî÷íîñòè, íî îêîí÷àòåëüíûé äèàãíîç ñòàâèòñÿ ñ ïîìîùüþ äðóãèõ ìåòîäîâ – àíàëèçà êðîâè, óëüòðàçâóêîâîãî èññëåäîâàíèÿ ñåðäöà.
Suggestive of pericarditis – ïîäîçðåíèåíàïåðèêàðäèò
Òàêèå èçìåíåíèÿ ÝÊà íàáëþäàþòñÿ ïðèïåðèêàðäèòàõ. Áîëåå òî÷íàÿ äèàãíîñòèêà ïåðèêàðäèòà âîçìîæíà ñ ïîìîùüþ óëüòðàçâóêîâîãî èññëåäîâàíèÿ ñåðäöà.
Suggestiveofchroniclungdisease – ïîäîçðåíèå íà çàáîëåâàíèå ëåãêèõ
Òàêèå èçìåíåíèÿ ÝÊà íàáëþäàþòñÿ ïðè õðîíè÷åñêèõ çàáîëåâàíèÿõ ëåãêèõ –õðîíè÷åñêèé áðîíõèò, áðîíõèàëüíàÿ àñòìà, ýìôèçåìà ëåãêèõ. Äèàãíîç óêàçàííûõ çàáîëåâàíèé óòî÷íÿåòñÿ ñ ïîìîùüþ èññëåäîâàíèÿ ôóíêöèè ëåãêèõ ñ ïîìîùüþ ñïèðîìåòðèè, ðåíòãåíîëîãè÷åñêîãî èññëåäîâàíèÿ ëåãêèõ.
 íàñòîÿùåå âðåìÿ ïðåäëîæåí ðÿä ìîäèôèêàöèé ìåòîäà ýëåêòðîêàðäèîãðàôèè, êîòîðûå óâåëè÷èâàþò åãî èíôîðìàòèâíîñòü â îñíîâíîì äëÿ äèàãíîñòèêè èøåìè÷åñêîé áîëåçíè ñåðäöà è àðèòìèé. Îñíîâíîé ïðèíöèï âñåõ ýòèõ ìîäèôèêàöèé - ïîâûñèòü â òîé èëè èíîé ñòåïåíè íàãðóçêó íà ñåðäöå, ïðè ýòîì èçìåíåíèÿ íà ÝÊà ïðîÿâëÿþòñÿ áîëåå îò÷åòëèâî. Ýòî òàê íàçûâàåìûå ñòðåññ-òåñòû ñ ÝÊÃ. Áîëüíîìó ñíèìàþò ÝÊà â ïîêîå, à ïîòîì ïðîñÿò â òå÷åíèå îïðåäåëåííîãî âðåìåíè êðóòèòü ïåäàëè íà ñïåöèàëüíîì âåëîñèïåäå - âåëîýðãîìåòðå èëè ïðîáåæàòüñÿ ïî äâèæóùåéñÿ äîðîæêå òðåäìèëå. Íà ýòèõ ïðèáîðàõ ôèçè÷åñêàÿ íàãðóçêà òî÷íî èçìåðÿåòñÿ è äîçèðóåòñÿ. Âî âðåìÿ è ïîñëå òàêîé íàãðóçêè ñíîâà ñíèìàþò ÝÊà è ÷àñòî òàì ïîÿâëÿþòñÿ èçìåíåíèÿ, êîòîðûõ íå áûëî â ïîêîå.
Ïðèçíàêè ñòðåññ-òåñòà ÝÊÃ
POSITIVE, ST-segment depression >2 mm – ïîëîæèòåëüíûéòåñò, ñíèæåíèíòåðâàëST
Òåñò ñ÷èòàåòñÿ ïîëîæèòåëüíûì, êîãäà âî âðåìÿ íàãðóçêè íà ÝÊà ñíèæàåòñÿ èíòåðâàë ST. Òàêèì îáðàçîì, ïîäòâåðæäàåòñÿ äèàãíîçèøåìè÷åñêîé áîëåçíè ñåðäöà, ñòåíîêàðäèè.
POSITIVE, Angina onset – ïîëîæèòåëüíûé òåñò, ïîÿâèëèñü òèïè÷íûå äëÿ ñòåíîêàðäèè áîëè
Òåñò òàêæå ñ÷èòàåòñÿ ïîëîæèòåëüíûì, åñëè âî âðåìÿ íàãðóçêè ó áîëüíîãî ïîÿâëÿþòñÿ áîëè çà ãðóäèíîé, òèïè÷íûå äëÿ ñòåíîêàðäèè. Èçìåíåíèé ÝÊà ìîæåò è íå áûòü. Òàêèì îáðàçîì, òàêæå ïîäòâåðæäàåòñÿ äèàãíîçèøåìè÷åñêîé áîëåçíè ñåðäöà, ñòåíîêàðäèè..
NEGATIVE: No ischemic signs (with 85% of maximal heart rate) – òåñòîòðèöàòåëüíûé, ïðèçíàêîâèøåìè÷åñêîéáîëåçíèíåò
Åñëè âî âðåìÿ íàãðóçêè ÷àñòîòà ñåðäå÷íûõ ñîêðàùåíèé óâåëè÷èâàåòñÿ ïðèìåðíî äî 85% ìàêñèìàëüíîé äëÿ ÷åëîâåêà äàííîãî âîçðàñòà, íåò ñíèæåíèÿ èíòåðâàëà ST íà ÝÊÃ, íåò áîëåé çà ãðóäèíîé, òåñò ñ÷èòàåòñÿ îòðèöàòåëüíûì. Ýòî ñ áîëüøîé âåðîÿòíîñòüþ ïîçâîëÿåò ãîâîðèòü îá îòñóòñòâèè èøåìè÷åñêîé áîëåçíè ñåðäöà.
 ðÿäå ñëó÷àåâ ïðîâåäåíèå òåñòà âðà÷îì ïðåêðàùàåòñÿ. Ïðè÷èíû ïðåðûâàíèÿ ïðîâåäåíèÿ òåñòà:
Stopped, Patient's refusal – îòêàçïàöèåíòà
Stopped, Fatigue – ñèëüíàÿ ñëàáîñòü
Âî âðåìÿ ïðîâåäåíèÿ òåñòà ó áîëüíîãî ïîÿâëÿåòñÿ ñèëüíàÿ ñëàáîñòü, èññëåäîâàíèå ïðåêðàùàåòñÿ
Stopped, Signsofpureperfusion – âûðàæåííûå íàðóøåíèÿ êðîâîîáðàùåíèÿ
Ê òàêîãî ðîäà íàðóøåíèÿì îòíîñÿò âûðàæåííóþ áëåäíîñòü êîæè, ïîÿâëåíèå îáèëüíîãî õîëîäíîãî ïîòà, ñåðäöåáèåíèÿ
Stopped, Shortness of breath – ñèëüíàÿîäûøêà
Ñèëüíàÿ îäûøêà ñâèäåòåëüñòâóåò î ñåðäå÷íîé íåäîñòàòî÷íîñòè è ñëóæèò ñèãíàëîì äëÿ ïðåêðàùåíèÿ òåñòà
Stopped, Arrhythmia;Stopped, Conductiondisturbance; Stopped, Excessivepulserateincrease; – âûðàæåííàÿ àðèòìèÿ; íàðóøåíèÿ ïðîâîäèìîñòè; çíà÷èòåëüíîå óðåæåíèå ïóëüñà
Óêàçàííûå òðè ïðè÷èíû ïðåêðàùåíèÿ òåñòà ëåãêî ðàñïîçíàþòñÿ, ïîñêîëüêó âî âðåìÿ òåñòà íåïðåðûâíî ðåãèñòðèðóåòñÿ ÝÊà è òå èçìåíåíèÿ, êîòîðûå âîçíèêàþò, ãîâîðÿò îá îïàñíîñòè äàëüíåéøåãî ïðîâåäåíèÿ íàãðóçêè íà ñåðäöå
Stopped, Centralnervoussystemsymptoms – íàðóøåíèÿ öåíòðàëüíîé íåðâíîé ñèñòåìû
Ðå÷ü èäåò îá îáìîðîêå, ïîÿâëåíèè ñèëüíîãî ãîëîâîêðóæåíèÿ, äâîåíèÿ â ãëàçàõ.
Stopped, DropinBP (25-30%) – ïàäåíèå àðòåðèàëüíîãî äàâëåíèÿ
Âî âðåìÿ íàãðóçêè àðòåðèàëüíîå äàâëåíèå óìåðåííî ïîâûøàåòñÿ. Íàãðóçêà ïðåêðàùàåòñÿ, åñëè äàâëåíèå íå òîëüêî íå ïîâûøàåòñÿ, íî ñíèæàåòñÿ íà 25-30% íèæå èñõîäíîãî óðîâíÿ äî íà÷àëà íàãðóçêè.
Stopped, BP>230/130 – âûðàæåííîå ïîâûøåíèå àðòåðèàëüíîãî äàâëåíèÿ
Òåñò ïðåðûâàåòñÿ, åñëè ÀÄ ïîâûøàåòñÿ áîëêê 230/130 ìì ðò.ñò.
Èíîãäà âìåñòî ôèçè÷åñêîé íàãðóçêè áîëüíîìó äàþò ëåêàðñòâî, óñèëèâàþùåå ðàáîòó ñåðäöà, è òàêæå ñíèìàþò ÝÊà ïîñëå ââåäåíèÿ ëåêàðñòâà. Åñòü ìåòîäèêà íåïðåðûâíîé ðåãèñòðàöèè ÝÊà íà ñïåöèàëüíîì ìàëåíüêîì ïðèáîðå, êîòîðûé áîëüíîé íîñèò ñ ñîáîé â òå÷åíèå 18-24 ÷àñîâ, âûïîëíÿÿ ïðè ýòîì ñâîþ îáû÷íóþ ðàáîòó - òàê íàçûâàåìîå õîëòåðîâñêîå ìîíèòîðèðîâàíèå. Çàòåì çàðåãèñòðèðîâàííàÿ íà ìàãíèòíóþ ïëåíêó ÝÊà àíàëèçèðóåòñÿ òàêæå íà äðóãîì ñïåöèàëüíîì ïðèáîðå, è óäàåòñÿ óñòàíîâèòü ïîÿâëÿþùèåñÿ â òå÷åíèå âðåìåíè ðåãèñòðàöèè íàðóøåíèÿ ðèòìà, èçìåíåíèÿ, õàðàêòåðíûå äëÿ ñòåíîêàðäèè.
Èíôîðìàòèâíîñòü ìåòîäà è åãî ïðåäåëû. Ýëåêòðîêàðäèîãðàôèÿ î÷åíü èíôîðìàòèâíûé ìåòîä èññëåäîâàíèÿ ïðè çàáîëåâàíèÿõ ñåðäöà, íî íå ïðè âñåõ. Íàèáîëüøóþ èíôîðìàöèþ îí äàåò ïðè íàðóøåíèÿõ ðèòìà ñåðäöà (àðèòìèÿõ), çäåñü íàäåæíîñòü ìåòîäà ïðèáëèæàåòñÿ ê 100%.Îäíî èç çàáîëåâàíèé ñåðäöà, ïðè êîòîðûõ ÝÊà òàêæå äàåò áîëüøóþ èíôîðìàöèþ - ýòî èíôàðêò ìèîêàðäà. Íàäåæíîñòü ïîëîæèòåëüíîãî îòâåòà âî ìíîãîì çàâèñèò îò ÷èñëà îòâåäåíèé ÝÊÃ. Êîãäà ñíèìàëè òîëüêî òðè îòâåäåíèÿ ÝÊÃ, äèàãíîç èíôàðêòà ïîäòâåðæäàëñÿ â 30% ñëó÷àåâ, óâåëè÷åíèå ÷èñëà îòâåäåíèé äî øåñòè óâåëè÷èëî ýòîò ïðîöåíò äî 50%. Êîãäà ñòàëè ñíèìàòü ãðóäíûå îòâåäåíèÿ ïðîöåíò ïîäòâåðæäåíèÿ óâåëè÷èëñÿ äî 85-90%.  ìåíüøåé ñòåïåíè ïîìîãàåò ÝÊÃ, ñíÿòàÿ â ïîêîå, ïðè ñòåíîêàðäèè, ãèïåðòîíèè, ïîðîêàõ ñåðäöà, âîñïàëèòåëüíûõ çàáîëåâàíèÿõ ñåðäöà. Ñòðåññ-òåñò çíà÷èòåëüíî ïîâûøàåò èíôîðìàòèâíîñòü ÝÊà â ðàñïîçíàâàíèè ñòåíîêàðäèè.
Èíôîðìàòèâíîñòü ìåòîäà ÝÊà òàêæå çíà÷èòåëüíî ïîâûøàåòñÿ, êîãäà êðèâàÿ ðàñøèôðîâûâàåòñÿ àâòîìàòè÷åñêè ñ ïîìîùüþ êîìïüþòåðíûõ ïðîãðàìì. Êîìïüþòåð êàê áû "âèäèò" áîëüøå íàðóøåíèé â ÝÊÃ, ÷åì âðà÷-ñïåöèàëèñò, õîòÿ ïîñëåäíåå ñëîâî â îöåíêå ÝÊà âñå-òàêè ïðèíàäëåæèò âðà÷ó.
Ïîäãîòîâêà ê èññëåäîâàíèþ. Ñïåöèàëüíîé ïîäãîòîâêè äëÿ ðåãèñòðàöèè ÝÊà â ïîêîå íå òðåáóåòñÿ. Ïåðåä ïðîâåäåíèåì ñòðåññ-òåñòîâ áîëüíîìó ðåêîìåíäóþò îòìåíèòü íåêîòîðûå ëåêàðñòâà (áåòà-áëîêàòîðû, íèòðàòû), íå åñòü ïåðåä èññëåäîâàíèåì â òå÷åíèå 6 ÷àñîâ.
Îïàñíîñòè è îñëîæíåíèÿ. ÝÊÃ-èññëåäîâàíèå â ïîêîå ñîâåðøåííî áåçîïàñíî è íå äàåò îñëîæíåíèé. Ñòðåññ-òåñòû â îïðåäåëåííîì ïðîöåíòå ñëó÷àåâ ìîãóò äàâàòü ïîáî÷íûå ýôôåêòû - íàðóøåíèÿ ðèòìà ñåðäöà, èçìåíåíèÿ àðòåðèàëüíîãî äàâëåíèÿ. Ýòè èçìåíåíèÿ îáóñëîâëåíû ïîâûøåííîé íàãðóçêîé íà ñåðäöå, ÷òî ÿâëÿåòñÿ îñíîâíîé çàäà÷åé èññëåäîâàíèÿ. %% ïîäîáíûõ ïîáî÷íûõ ýôôåêòîâ íåâåëèê. Êàáèíåò, ãäå ïðîâîäÿò ýòè òåñòû, îñíàùåí îáîðóäîâàíèåì è ìåäèêàìåíòàìè äëÿ îêàçàíèÿ íåîáõîäèìîé íåîòëîæíîé ïîìîùè. Èññëåäîâàíèå ïðîâîäèòñÿ â ïðèñóòñòâèè âðà÷à.Èñòî÷íèê: http://www.encyclopedia.sun-clinic.co.il/I8.html

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