Ukululama Nokuvuselelwa Ngemva Kokuhlaselwa Yinhliziyo: Ake Sixoxe Ngalokhu!

Uma uke waba nesifo senhliziyo, kuyinto evamile ukuzizwa wesaba kakhulu futhi ungaqiniseki ngemva kokubuya esibhedlela. Cishe unemibuzo eminingi engqondweni yakho, njengokuthi "Ngizophila kanjani manje?", "Ingabe ngiyokwazi ukusebenza futhi ngendlela efanayo?" Lokho kujwayelekile kakhulu. Ngakho-ke, kulesi sihloko, sizokhuluma ngendlela yokululama kancane kancane kulesi simo esinzima, nokuthi yini okudingeka siyenze ngaso.

Kuthatha isikhathi esingakanani ukululama ekuhlaselweni yinhliziyo?

Kalula nje, kungathatha noma yikuphi kusukela emavikini amabili kuya ezinyangeni ezintathu ukululama ngokuphelele ekuhlaselweni yinhliziyo. Uma usululame ngokuphelele, ungabuyela emsebenzini wakho futhi wenze imisebenzi yakho yansuku zonke njengokujwayelekile.

Noma kunjalo, lesi sikhathi sokuphulukiswa singahluka kumuntu nomuntu. Kunezici eziningana ezingasithinta:

• Ubunzima bokuhlaselwa yinhliziyo yakho: Ezinye izifo zenhliziyo zincane kakhulu, kanti ezinye zinkulu kakhulu. Isikhathi sokululama sizohluka ngokufanele.
• Ukuthi uthola ukwelashwa ngokushesha kangakanani: Uma uthola ukwelashwa ngokushesha, umonakalo omncane enhliziyweni uyancipha futhi isikhathi sokululama sifushane.
• Ukwelashwa okutholile: Isibonelo, uma uhlinzwe inhliziyo evulekile, kuzothatha isikhathi eside ukululama kunokungenelela kwenhliziyo okuhamba nge-percutaneous (ngezinye izikhathi okubizwa ngokuthi i-stenting).
• Impilo yakho iyonke kanye nezinye izimo zezokwelapha: Uma unezinye izimo zezokwelapha, njengesifo sikashukela noma umfutho wegazi ophakeme, zingathinta nesikhathi sakho sokululama.

Ngakho-ke, ukuze wazi kahle ukuthi kuzokuthatha isikhathi esingakanani, kungcono ukukhuluma nodokotela wakho.

Yini ongayilindela ngesikhathi sokululama?

Ngemva kokubuya ekhaya uvela esibhedlela, kuvamile ukuzizwa wesaba kancane futhi unesizungu uma ungekho kodokotela nabahlengikazi. Umndeni wakho ungase uzibuze ukuthi bangakusiza kanjani. Njengoba ujwayela kancane kancane impilo yakho evamile, ungalindela izinguquko ezincane ezintweni ezilandelayo:

• Izinga lomsebenzi wakho
• Indlela yokuzivocavoca
• Ukudla neziphuzo
• Imizwa yakho
• Impilo yocansi

Into ebaluleke kakhulu ukugcina ibhalansi phakathi kokuphumula nomsebenzi phakathi nalesi sikhathi sokululama. Udinga ukuthola ukuphumula okwanele ukusiza inhliziyo yakho ukuthi ilulame. Udinga futhi ukubuyela emisebenzini yakho evamile ngokushesha okukhulu, ngokuphephile. Ukuzivocavoca umzimba kubalulekile ukuze ululame. Udokotela wakho uzokuqondisa kukho konke lokhu.

Lizoba njani izinga lomsebenzi wakho?

Ungase uzizwe ukhathele futhi ubuthakathaka phakathi nesonto lokuqala usekhaya uvela esibhedlela. Lokhu kuyinto evamile kakhulu.Ngenxa yokuthi imisipha yenhliziyo yakho yonakalisiwe ukuhlaselwa yinhliziyo, kuthatha isikhathi ukuphulukiswa. Futhi, lokhu kwenzeka uma uvuka ngokuzumayo uye emsebenzini ngemva kokuphumula embhedeni. Ngakho-ke, zinike isikhathi sokujwayela kancane kancane imisebenzi yakho evamile.

Nazi ezinye izeluleko zokukusiza emasontweni ambalwa okuqala ngemva kokubuyela ekhaya:

• Gqoka njalo ekuseni. Kufanele ukwazi ukugeza nokunakekela inhlanzeko yakho.
• Qala ukwenza imisebenzi emincane yasekhaya, kodwa kuphela uma uzizwa usukulungele. Izinto ezifana nokugoqa izingubo, ukusiza ekuphekeni, ukwenza ingadi, ukusula uthuli, nokugeza izitsha.
• Sabalalisa umsebenzi wakho usuku lonke. Ungasebenzi kanzima ngesikhathi esisodwa. Uma uzizwa ukhathele, yima bese uphumula. Yenza umsebenzi osele ngolunye usuku.
• Nciphisa inani lezikhathi okhuphuka ngazo izitebhisi. Ngaphandle kokuthi udokotela wakho uthi cha, kulungile ukusebenzisa izitebhisi ekhaya izikhathi ezimbalwa ngosuku. Kodwa ungakwenzi umkhuba ukwenyuka nokwehla njalo.
• Ungaqali ngokuzumayo ukuphakamisa, ukusunduza, noma ukudonsa izinto ezisindayo. Linda kuze kube yilapho udokotela wakho ethi kulungile.
• Landela imiyalelo kadokotela ngqo. Uzokutshela ukuthi ungashayela nini, uye emsebenzini, bese uqala ukwenza imisebenzi enzima. Landela leyo miyalelo ngqo. Ungazikhandleli kakhulu ngesikhathi esisodwa.
• Uma uke wafakwa i-catheter yenhliziyo ngemva kokuhlaselwa yinhliziyo, udokotela wakho angase abeke imikhawulo eyengeziwe okwesikhashana ukuze amise ukuphuma kwegazi endaweni elimele. Landela nalokhu futhi.

Yimiphi imithambo ekusiza ukuthi ululame?

Ukuzivocavoca umzimba kuyingxenye ebalulekile yokululama kwakho. Enye yezindlela ezinhle kakhulu zokubuyela esimweni esihle ngemva kokuhlaselwa yinhliziyo ukujoyina uhlelo lokuvuselela inhliziyo. Lezi zinhlelo zisebenza nawe ukuthuthukisa uhlelo lokuzivocavoca oluphephile noluqondiwe olufanele wena. Ziphinde zikusize wenze izinguquko zokuphila okunempilo—njengokudla ukudla okunempilo, ukulawula ukucindezeleka, nokuyeka ukubhema. Khuluma nodokotela wakho ngezinhlelo zokuvuselela inhliziyo ongahlanganyela kuzo.

Ngisho nangemva kokuba uhlelo lwakho lokuvuselela umzimba seluphelile, ukuzivocavoca umzimba kufanele kube yingxenye yesimiso sakho sansuku zonke. Uma ubungeyena umuntu oqeqesha kakhulu ngaphambi kokuhlaselwa yinhliziyo, kungazelelwe ukutshelwa ukuthi uvivinya umzimba nsuku zonke kungaba yinto enzima kakhulu. Kodwa-ke, uhlelo lokuvuselela inhliziyo luzokusiza ukuthi ujwayele kancane kancane ukuzivocavoca umzimba. Ngakho-ke, lapho seluphelile, uzobe uqiniseka ngokwanele ukuthi uzozivocavoca wedwa. Ungadangali, yizinyathelo ezincane ezingenza umehluko omkhulu ngokuhamba kwesikhathi.

Ukudla nokuphuza kufanele kube kanjani?

Ukuze uvimbele izinkinga zesikhathi esizayo ezibangelwa yisifo senhliziyo, kubaluleke kakhulu ukulandela ukudla okunempilo kwenhliziyo.Nakuba kunezinhlelo eziningi zokudla okunempilo kwenhliziyo, ucwaningo lukhombisile ukuthi iMediterranean Diet iyona engcono kakhulu yokuvikela inhliziyo yakho. Lokhu kudla:

• Hlela ukudla kwakho okuyinhloko ngokudla okusekelwe ezitshalweni njengemifino, izithelo, ubhontshisi kanye nokolweni ophelele.
• Ukudla amafutha anempilo afana namafutha omnqumo, ukwatapheya, namakinati.
• Yidla ukudla kwasolwandle, inkukhu engenamafutha amaningi, amaqanda, kanye nobisi olunamafutha amancane ngokulinganisela.
• Ukunciphisa inyama ebomvu (inyama yenkomo, ingulube, inyama yenkomo, inyama yemvu), ukudla okuthosiwe, kanye namaswidi.

Uzizwa kanjani? (Inhlalakahle yengqondo)

Ngemva kokuhlaselwa yinhliziyo, ungase ube nemizwa yokucindezeleka, intukuthelo, nokwesaba . Lokhu kuyindlela evamile yokusabela, futhi kuzophela kancane kancane njengoba ubuyela emisebenzini yakho yansuku zonke. Nazi ezinye izinto ezingakusiza ukubhekana nale mizwa:

• Vuka njalo ekuseni ugqoke ingubo. Ungalali embhedeni, ungalali ugqoke amapijama akho.
• Hamba ngezinyawo isikhathi esifushane nsuku zonke. Kodwa kufanele ulandele imiyalelo yokuzilolonga enikezwa udokotela.
• Buyela kancane kancane ezintweni ozilibazisa ngazo kanye nemisebenzi yokuxhumana nabantu. Kodwa ungalethi abantu abaningi kakhulu ekhaya lakho ngesikhathi esisodwa. Yandisa kancane kancane ukuxhumana kwakho nabantu njengoba uzizwa ukhululekile.
• Yabelana ngalokho okucabangayo. Khuluma nomngane, ilungu lomndeni, umeluleki, noma iqembu lokusekelana.
• Lala kahle ebusuku. Ukungalali ngokwanele kungakwenza uzizwe ukhathele futhi ucasukile. Ukuze ulale kalula ebusuku, gwema ukulala kakhulu emini.
• Bamba iqhaza ohlelweni lokuvuselela inhliziyo. Lolu hlobo lokuzivocavoca oluqondiswayo kanye nohlelo lokufundisa lungakunikeza impumuzo yengqondo.
• Ungesabi ukubuza imibuzo. Buza ithimba lakho lezokwelapha noma nini lapho unombuzo. Qonda incazelo yamagama ezokwelapha kanye nohlelo lwakho lokwelashwa. Ukufunda ngesifo senhliziyo nokuthi ungaphila kanjani naso kuzokunika amandla amaningi. Wena

Uma wazi okuningi, uzokwazi kangcono ukwenza izinqumo ezizuzisa impilo yakho.

Ingabe kufanele sifunde nangezenzo zocansi?

Ukuthi ungaphinde ulale ngokushesha kangakanani kuncike ekutheni uthola ukwelashwa okunjani nokuthi uzizwa kanjani manje. Uma uhlinzwe inhliziyo evulekile, kuzothatha cishe amasonto amane kuya kwayisithupha ukuthi ithambo lakho lesifuba liphole. Ngakho-ke, kufanele ugweme ukuya ocansini kuze kube yileso sikhathi.

Uma ungakaze uhlinzwe, kufanele ukwazi ukuya ocansini cishe amasonto amabili kuya kwamane ngemva kokuhlaselwa yinhliziyo. Bona ukuthi uzizwa kanjani nokuthi lingakanani izinga lamandla akho. Uma ungakwazi ukukhuphuka izitebhisi ezimbili ngaphandle kobuhlungu esifubeni sakho, ungase ube namandla anele okwenza ucansi.

Lezi zinto zizokusiza njengoba ubuyela empilweni evamile:

• Khuluma ngokukhululekile nomlingani wakho ngendlela ozizwa ngayo kanye nezinga lamandla akho.
• Thola ezinye izindlela zokwabelana ngobuhlobo obuseduze nomlingani wakho.
• Yenza ucansi uma uphumule futhi ukhululekile ngokomzimba .
• Yenza ucansi okungenani amahora amabili ngemva kokudla ukudla okumnandi .
• Khuluma nodokotela wakho uma unenkinga. Isifo senhliziyo kanye neminye imithi kungabangela ukungasebenzi kahle kocansi. Uma kunjalo, awuwedwa. Khuluma nodokotela wakho ukuze uthole ukwesekwa okudingayo.

Ingabe inhliziyo iphola ngokuphelele ngemva kokuhlaselwa yinhliziyo?

Inhliziyo yakho ingaphola ngemva kokuhlaselwa yinhliziyo, kodwa kuthatha isikhathi. Futhi, ukuhlaselwa yinhliziyo kungashiya umonakalo enhliziyweni, obizwa ngokuthi 'izicubu zesilonda'. Inani lalo monakalo liyahlukahluka kuye ngokuthi:

• Isikhathi sokwelashwa: Uma uthola ukwelashwa ngokushesha, umonakalo enhliziyweni yakho uzoba mncane.
• Lapho umthambo uvalekile khona: Imithambo yakho yenhliziyo ihlinzeka ngegazi ezingxenyeni ezahlukene zenhliziyo yakho. Lapho umthambo owodwa uvalekile, ingxenye yenhliziyo yakho ehlinzekwa yilowo mthambo inqanyulwa ukugeleza kwegazi. Ngakho-ke, inani lomonakalo enhliziyweni yakho lincike ekutheni ukuvaleka kwenzeka kuphi nokuthi ingakanani inhliziyo yakho evame ukunikeza igazi.

Kungathatha izinyanga ezimbili ukuthi imisipha yenhliziyo yakho ilulame. Kodwa-ke, izicubu ezisele zingenza kube nzima ngenhliziyo yakho ukupompa igazi. Ngokuhamba kwesikhathi, lokhu kungaholela kwezinye izinkinga, njengokwehluleka kwenhliziyo. Khuluma nodokotela wakho mayelana nobukhulu bomonakalo enhliziyweni yakho nokuthi yini ongayilindela.

Kungenzeka yini ukululama ngokuphelele ekuhlaselweni yinhliziyo?

Abantu abaningi bayalulama ngokuphelele ekuhlaselweni yinhliziyo futhi baphile impilo ende. Kodwa futhi udinga ukwazi ukuthi usengozini. Cishe umuntu oyedwa kwabahlanu abaneminyaka engu-45 noma ngaphezulu uzoba nokuhlaselwa kwenhliziyo kwesibili zingakapheli iminyaka emihlanu. Lokhu kusho ukuthi imizamo yokuvimbela ibaluleke kakhulu uma ufuna ukunciphisa ingozi yakho futhi uhlale uphilile isikhathi eside.

Ngingakuvimbela kanjani okunye ukuhlaselwa yinhliziyo?

Ngemva kokuhlaselwa yinhliziyo, kubalulekile ukwenza konke okusemandleni akho ukuvimbela ukulimala kwenhliziyo yakho esikhathini esizayo. Udokotela wakho uzokunikeza iseluleko esiqondene nawe kanye nesimo sakho. Ngezansi kunezeluleko ezijwayelekile zokusiza ukugcina inhliziyo yakho iphilile.

Ingabe ngidinga ukusebenzisa umuthi njengoba nje ngitshelwe?

Yebo, nakanjani! Ngemva kokuhlaselwa yinhliziyo, udokotela wakho uzokunikeza imithi yalezi zinto:

• Vimbela ukuqhekeka kwegazi esikhathini esizayo.
• Nciphisa umthwalo enhliziyweni yakho futhi uthuthukise ukusebenza kwenhliziyo kanye nokululama.
• Yehlisa amazinga akho e-cholesterol.

Uma kudingeka, udokotela angase futhi anikeze imithi yalezi zinto:

• Yelapha ukungalingani kwesigqi senhliziyo (i-arrhythmias).
• Yehlisa umfutho wegazi lakho.
• Lawula i-angina (ubuhlungu besifuba noma ukungakhululeki).
• Yelapha ukwehluleka kwenhliziyo.

Udokotela wakho uzokuchazela ngemithi yakho. Ungakhohlwa ukubuza noma yimiphi imibuzo onayo mayelana nokuthi imiphi imithi oyithathayo, imiphi imiphumela emibi engaba nayo, nokuthi kungani uyithatha.

Ngisho noma uzizwa uphilile ngokuphelele, thatha yonke imithi oyinikezwe udokotela ngesikhathi. Imithi yakho iyona ekugcina uphilile. Uma unemiphumela emibi, yibhale phansi encwadini yokubhala bese utshela udokotela wakho ukuthi ivela nini.

Ekugcineni, yenza uhlu lwazo zonke izidakamizwa ozithathayo bese ulugcina nawe ngaso sonke isikhathi. Uhlu kufanele luhlanganise okulandelayo:

• Amagama emithi.
• Ukuchaza ukuthi kungani uthatha umuthi ngamunye.
• Umuthi ngamunye kufanele uphuzwe kangaki futhi ngasiphi isikhathi.

Uyafuna ukwenza izinguquko endleleni yokuphila?

Yebo, lokhu kubaluleke kakhulu. Asikwazi ukushintsha ezinye zezinto ezibangela isifo semithambo yenhliziyo (njengobudala nomlando womndeni). Kodwa-ke, kunezinto ezithile ongazenza ukuze unciphise ingozi yakho. Khuluma nodokotela wakho ngalezi zinto bese ucela usizo:

• Uma ubhema, uphe i-vape, noma usebenzisa noma yimuphi omunye umkhiqizo kagwayi, yeka ngokuphelele. Ukusebenzisa ugwayi kuyisici esibaluleke kakhulu esingashintsha ingozi yesifo semithambo yenhliziyo. Ukuyeka akulula, kodwa kungenza umehluko omkhulu empilweni yenhliziyo yakho.
• Nciphisa utshwala. Uma kungenzeka, yeka ngokuphelele, noma unciphise njengoba udokotela wakho encoma.
• Landela ukudla okwehlisa amazinga akho e-cholesterol. Buza udokotela wakho noma isazi sokudla okunempilo ukuthi i-Mediterranean Diet noma olunye uhlelo lukulungele yini.
• Gcina isisindo esinempilo. Uma ukhuluphala, inhliziyo yakho kufanele isebenze kanzima ukupompa igazi liye kuwo wonke umzimba wakho. Ukukhuluphala ngokweqile kwandisa nengozi yakho yomfutho wegazi ophakeme, i-cholesterol ephezulu, nesifo sikashukela. Buza udokotela wakho ukuthi yisiphi isisindo sakho esifanele nokuthi yini ongayenza ukuze ufike lapho.
• Yenza ukuvivinya umzimba kube yingxenye yesimiso sakho sansuku zonke. Ukuvivinya umzimba njalo kungandisa amazinga akho amandla, kwehlise i-cholesterol, kulawule isisindo sakho, futhi kunciphise ukucindezeleka. Khuluma nodokotela wakho ngaphambi kokuqala noma yiluphi uhlelo lokuvivinya umzimba.
• Lawula isifo sikashukela. Ucwaningo lukhombisile ukuthi amazinga aphezulu kashukela egazini andisa ingozi yesifo semithambo yenhliziyo. Isifo sikashukela singalawulwa ngokushintsha ukudla, ukuzivocavoca umzimba kanye nemithi.
• Lawula umfutho wegazi ophakeme. Umfutho wegazi ophakeme ungalimaza ulwelwesi lwemithambo yakho yenhliziyo, okuholela esifweni semithambo yenhliziyo. Ukudla okunosawoti omncane, ukuzivocavoca umzimba, kanye nemithi kungasiza ekugcineni umfutho wegazi wakho usezingeni elifanele.
• Zama ukugcina ingqondo yakho ikhululekile ngaso sonke isikhathi. Izinto ezifana ne-yoga, ukuzindla, kanye nokuzivocavoca ngokuphefumula okujulile kungakusiza ukuthi ulawule ukucindezeleka nentukuthelo. Le mizwa iphinde ikhulise ingozi yesifo semithambo yenhliziyo.

Uyafuna ukubona udokotela njalo?

Yebo, lokho kubalulekile futhi. Uzoba ne-aphoyintimenti yokulandelela ngemva kwamasonto amane kuya kwayisithupha uphumile esibhedlela. Udokotela uzobe esehlola inqubekela phambili yakho yokululama.

Kuzodingeka futhi ukuthi uhlolwe njalo, njengokuhlolwa kokucindezeleka kokuzivocavoca. Lokhu kuhlolwa kuvumela udokotela wakho ukuthi aqaphe inhliziyo yakho futhi ahlole ukuvinjelwa okusha noma okubi kakhulu.

Uma unalezi zimpawu, shayela udokotela wakho ngaphandle kokulinda i-aphoyintimenti:

• Uma i-angina ivela njalo, iyanda ngamandla, ihlala isikhathi eside, noma isakazekele kwezinye izindawo.
• Ubunzima bokuphefumula, ikakhulukazi lapho uphumule.
• Isiyezi.
• Ukuphazamiseka kwenhliziyo.

Yini okufanele uyenze uma une-angina?

I-Angina iyisibonakaliso sokuthi inhliziyo yakho ayitholi igazi elanele elinomoya-mpilo. I-Angina ingazizwa kanje:

• Uzizwa ungakhululekile, ucindezelekile, usinda, noma ubuhlungu esifubeni sakho. Lo muzwa ungase usakazekele nasemhlane wakho, emhlathini, emphinjeni, noma engalweni.
• Umuzwa wokugcwala, ukungagayi kahle kokudla, noma ukuqunjelwa.

Lokhu kungahluka kuye ngomuntu nomuntu, kodwa ngokuvamile kuzwakala ngendlela efanayo njalo. Okusho ukuthi, uma une-angina, uhlala uzizwa ngendlela efanayo.

Kuvamile ukuzizwa wesaba uma une-angina ngemva kokuhlaselwa yinhliziyo. Landela imiyalelo kadokotela wakho yokuthi wenzeni esimweni esinjalo. Nazi ezinye zezeluleko ezijwayelekile:

1. Yeka lokho obukwenza. Hlala phansi uphumule.

2. Uma une-nitroglycerin, beka iphilisi elilodwa ngaphansi kolimi lwakho bese ulivumela lincibilike. Noma, fafaza i-nitroglycerin spray ngaphansi kolimi lwakho.

3. Linda imizuzu emihlanu.

4. Uma usenayo i-angina ngemva kwemizuzu emihlanu, shayela u-1990 (isevisi ye-ambulensi ephuthumayo yaseSri Lanka) ngokushesha. Ungalibali.

5. Isikhulu sesikhungo socingo oluphuthumayo singase sikutshele ukuthi uhlafune futhi ugwinye i-aspirin (ngaphandle kokuthi unesizathu sezokwelapha sokungayithathi i-aspirin). Ukuthatha i-aspirin kusenesikhathi ekuhlaselweni yinhliziyo kungathuthukisa ukululama kwakho.

6. Ungashayeli wedwa uye esibhedlela.Abasebenzi bezokwelapha abaphuthumayo bangaqala ukwelashwa khona lapho ukusiza ekusindiseni inhliziyo yakho.

Khumbula, uma uke wanikezwa umuthi, hlala ugcina i-nitroglycerin yakho nawe. Futhi khumbula lezi zinto:

• I-Nitroglycerin iza ngesimo samaphilisi noma isifutho.
• Kufanele ugcine i-nitroglycerin yakho ebhodleleni elimnyama, kude nokushisa nomswakama.
• Hlola usuku lokuphelelwa yisikhathi ebhodleleni. Kufanele uthenge elisha zingakapheli izinyanga eziyisithupha ulivulile.

Okokugcina, izinto ezibaluleke kakhulu okufanele uzikhumbule (Umyalezo Wokuya Ekhaya)

Ukululama ekuhlaselweni yinhliziyo kuwuhambo oluthatha isikhathi, isineke, kanye nendlela entsha yokucabanga ngenhlalakahle yakho. Kungaba nzima ukuthola isikhathi sokubeka impilo yakho phambili ngayo yonke eminye imithwalo yemfanelo onayo phakathi nosuku. Kodwa-ke, ukuhlaselwa yinhliziyo kuyisikhumbuzo esinamandla sokuthi umzimba wakho udinga ukunakekelwa okwengeziwe.

Manje yisikhathi sokuqala impilo yakho kabusha futhi ugxile ezintweni ezizosiza impilo yakho yesikhathi eside. Sebenzisana nodokotela wakho ukuze wakhe uhlelo olunempilo yenhliziyo lwekusasa lakho. Ngikufisela ukululama okusheshayo!

Ukuhlaselwa Yinhliziyo , Ukuvuselelwa Kwesifo Senhliziyo, Ukuvuselelwa Kwenhliziyo, Impilo Yenhliziyo, Izinguquko Zendlela Yokuphila, Ukuzivocavoca, Ukudla Okunempilo, Ukuhlaselwa Yinhliziyo, Ukuvuselelwa Kwesifo Senhliziyo, Ukuvuselelwa Kwenhliziyo, Izinguquko Zendlela Yokuphila, I-Angina, i-Nitroglycerin